5.1 The resistivity of the surrounding soil environment is a factor in the corrosion of underground structures. High resistivity soils are generally not as corrosive as low resistivity soils. The resistivity of the soil is one of many factors that influence the service life of a buried structure. Soil resistivity may affect the material selection and the location of a structure.55.2 Soil resistivity is of particular importance and interest in the corrosion process because it is basic in the analysis of corrosion problems and the design of corrective measures.5.3 The test method is focused to provide an accurate, expeditious measurement of soil resistivity to assist in the determination of a soil’s corrosive nature. Test Method G57 emphasizes an in situ measurement commonly utilized in the design of a buried structures’ corrosion control (cathodic protection systems’ ground bed design, and so forth), but also includes information and procedures on a four-pin soil box method. The two-electrode soil box method is an accurate and more expeditious method than the four-pin soil box and often complements the four-pin, in situ soil resistivity method.5.4 The saturated soil resistivity determined by this test method does not necessarily indicate the minimum soil resistivity.1.1 This test method covers the equipment and procedures for the measurement of soil resistivity, for soil samples removed from the ground, for use in the assessment and control of corrosion of buried structures.1.2 Procedures allow for this test method to be used in the field or in the laboratory.1.3 The test method procedures are for the resistivity measurement of soil samples in the saturated condition and in the as-received condition.1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. Soil resistivity values are reported in ohm-centimeter.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and to determine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 590元 / 折扣价： 502 元 加购物车

This specification covers joints for precast concrete pipe and box and other sections using preformed flexible joint sealants for use in storm sewers and culverts which are not intended to operate under internal pressure, or are not subject to infiltration or exfiltration limits. Joint material used in horizontal applications is intended to prevent the flow of solids through the joint. The acceptability of the pipe joint and sealant shall be determined by the results of the physical tests prescribed. Bitumen sealants shall be produced from asphalts, hydrocarbon resins and plasticizing compounds reinforced with inert mineral filler and shall contain no solvents. Butyl rubber sealants shall be produced from blends of butyl rubber and refined hydrocarbon resins and plasticizing compounds reinforced with inert mineral filler and shall contain no solvents. The joint design shall consist of a bell or groove on one end of the section and a spigot or tongue on the adjacent end of the joining section. The different test methods for the determination of the composition and physical properties of bitumen or butyl sealants are presented in details. The sections shall be tested hydrostatically in vertical alignment and a sufficient number of sections shall be assembled in straight alignment.1.1 This specification covers joints for precast concrete pipe and box, and other sections using preformed flexible joint sealants for use in storm sewers and culverts which are not intended to operate under internal pressure, or are not subject to infiltration or exfiltration limits. Joint material used in horizontal applications is intended to prevent the flow of solids through the joint.1.2 For precast concrete manhole sections and other vertical structures, which are subject to internal or external pressure, infiltration or exfiltration limits are not prohibited from being specified. Joints in vertical structures covered by this specification are intended mainly to prevent the flow of solids or fluids through the joint.1.3 This specification is to be used with pipe and structures conforming in all respects to Specifications C14, C76, C478, C506, C507, C655, C985, C1433, C1504, and C1577, provided that if there is a conflict in permissible variations in dimensions, the requirements of this specification shall govern.1.4 This specification is the inch-pound companion to C990M; therefore, no SI equivalents are presented in the specification.NOTE 1: This specification covers the material and performance of the joint and sealant only. Infiltration and exfiltration quantities for installed sections are dependent on factors other than the joints which must be covered by other specifications and suitable testing of the installed pipeline.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 / 折扣价： 438 元 加购物车

This specification covers joints for precast concrete pipe and box and other sections using preformed flexible joint sealants for use in storm sewers and culverts which are not intended to operate under internal pressure, or are not subject to infiltration or exfiltration limits. Joint material used in horizontal applications is intended to prevent the flow of solids through the joint. The acceptability of the pipe joint and sealant shall be determined by the results of the physical tests prescribed. Bitumen sealants shall be produced from asphalts, hydrocarbon resins and plasticizing compounds reinforced with inert mineral filler and shall contain no solvents. Butyl rubber sealants shall be produced from blends of butyl rubber and refined hydrocarbon resins and plasticizing compounds reinforced with inert mineral filler and shall contain no solvents. The joint design shall consist of a bell or groove on one end of the section and a spigot or tongue on the adjacent end of the joining section. The different test methods for the determination of the composition and physical properties of bitumen or butyl sealants are presented in details. The sections shall be tested hydrostatically in vertical alignment and a sufficient number of sections shall be assembled in straight alignment.1.1 This specification covers joints for precast concrete pipe and box and other sections using preformed flexible joint sealants for use in storm sewers and culverts which are not intended to operate under internal pressure, or are not subject to infiltration or exfiltration limits. Joint material used in horizontal applications is intended to prevent the flow of solids through the joint.1.2 Precast concrete manhole sections and other vertical structures that are subject to internal or external pressure, infiltration, or exfiltration limits are not prohibited from being specified. Joints in vertical structures covered by this specification are intended mainly to prevent the flow of solids or fluids through the joint.1.3 This specification is to be used with pipe and structures conforming in all respects to Specifications C14M, C76M, C478M, C506M, C507M, C655M, C985M, C1433M, C1504M, and C1577, provided that if there is a conflict in permissible variations in dimensions, the requirements of this specification shall govern.1.4 This specification is the metric companion of Specification C990.NOTE 1: This specification covers the material and performance of the joint and sealant only. Infiltration and exfiltration quantities for installed sections are dependent on factors other than the joints which must be covered by other specifications and suitable testing of the installed pipeline.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 / 折扣价： 438 元 加购物车

5.1 When a box becomes wet, the performance of the box and its closure are reduced. It is desirable to have box closure methods that retain an ability to keep the box closed when wet. Sealing or reinforcing methods sometimes are useful to improve performance of wet boxes and closures. Water resistance is sometimes a regulatory or contractual requirement.5.2 A test result indicating that a box closure tape or adhesive is soluble or dispersible in water is an indication that its function will be significantly impaired when wet. A test result that does not indicate solubility or dispersibility does not necessarily ensure that the bonding ability will be satisfactory when wet or that the performance of the box closure will be satisfactory when wet. Package performance testing described in the water resistance section of Practice D1974 is useful to further investigate the effects of water on package and closure functions.1.1 This test method covers a procedure to determine the water resistance of an adhesive or tape as measured by the amount of tape or adhesive dissolved or dispersed in water.1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 / 折扣价： 438 元 加购物车

1.1 This test method provides an accelerated procedure for predicting the effects of ultraviolet (UV) exposure and cold box cycling on one-part, elastomeric, solvent-release sealing compounds, when used in channel glazing and sealing applications. 1.2 The values stated in inch-pound units are to be regarded as the standard. The values stated in parentheses are for information only. 1.3 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

定价： 0元 / 折扣价： 0 元

4.1 This standard classification will be used to:4.1.1 Standardize the package size increasing availability, versatility, and acceptability of bulk box/pallet units.4.1.2 Lower transport package manufacturing costs.4.1.3 Lower cost/lb of packaged resin because of higher net weight/package.4.1.4 Reduce environmental impact of pallets and bulk boxes by reducing waste.4.1.5 Support reuse of bulk boxes and pallets throughout the supply chain.4.1.6 Optimize lifecycle package cost.4.1.7 Improve both inbound and outbound freight cost in comparison to non-optimal packaging.4.1.8 Lower inventory/storage cost of raw materials (need less on hand).4.1.9 Reduce warehouse space for resin storage.4.1.10 Reduce forklift trips (carrying higher weight).4.1.11 Promote multi-industry usage of common footprint boxes and pallets (examples are the automotive and chemical drum industry).4.1.12 Guide the first-time resin packager as to a successful bulk box/pallet unit now in use in the resin industry.4.1.13 Optimize net product weight in truckload trailer vans and oversea containers.4.2 This standard classification will be used by:4.2.1 Resin producers/converters/compounders/customers to compare with their current practice.4.2.2 Bulk box manufacturers to recommend a proven cost-effective package for plastic resins in the targeted bulk density range.4.2.3 Pallet manufacturers as a common bulk box footprint pallet for the targeted bulk density ranges used by the plastic resin industry.4.2.4 Box liner manufacturers to size their liners to a specified volume dimension.4.2.5 Warehouses to provide space layout plans based on dimensions of the standard box/pallet unit.1.1 This classification covers containers used to hold plastic resins with bulk density (Test Methods D1895) of 27 to 39 lb/ft3 (0.432 to 0.625 g/cm3).1.2 This classification does not apply to any plastic resins with bulk density below 27 lb/ft3 (0.432 g/cm3) or above 39lb/ft3 (0.625 g/cm3).1.3 This classification does not apply to bulk boxes containing hazardous materials.1.4 This classification does not address box/pallet unitization requirements.1.5 This classification does not address requirements of plastic bag liners normally placed inside the corrugated bulk box before filling with plastic resin.1.6 This classification does not address tamping, shaking, or other compression methods of the resin filled bulk box to condense entrained air and increase headspace in the bulk box.1.7 This classification does not address blocking and bracing or other shipping requirements normally associated with bulk box unit deliveries.1.8 This classification does not address filled bulk box/pallet unit stack height.1.9 This classification does not address international shipping regulations of bulk box/pallet units.1.10 This classification does not address pallet opening sizes for pallet trucks.1.11 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.1.12 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.13 This classification offers an organized collection of information or a series of options and does not recommend a specific course of action. This document cannot replace education or experience and should be used in conjunction with professional judgement. Not all aspects of this classification may be applicable in all circumstances. This ASTM standard is not intended to represent or replace the standard of care by which the adequacy of a given professional service must be judged, nor should this document be applied without consideration of a project's many unique aspects. The word “standard” in the title of this document means only that the document has been approved through the ASTM consensus process.1.14 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 590元 / 折扣价： 502 元 加购物车

This specification covers the procedures and test methods for the production of dry cast concrete, defined as very low slump or zero-slump concrete that requires continuous and intense vibration, or mechanical means, or a combination of vibration and mechanical means to consolidate the concrete, enabling immediate removal of the forms from the product. The placement, consolidation, curing, or protection of the concrete are not covered by this specification. The aggregates shall be sized, graded, proportioned, and mixed with such proportions of cementitious material, water, and admixtures, if any, to produce a thoroughly mixed concrete of such quality that the precast product will conform to the test and design requirements of the relevant specification. Materials covered by this specification are the following: cementitious materials (cement, slag cement, fly ash), allowable combinations of cementitious materials, aggregates, and admixtures and blends.This specification also covers weigh batching and mixing, volumetric batching and continuous mixing, reporting, and strength of the specimen.1.1 This specification covers the production of dry cast concrete as defined in 3.2.1. Requirements for quality of concrete shall be as hereinafter specified. This specification does not cover the placement, consolidation, curing, or protection of the concrete.1.2 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 515元 / 折扣价： 438 元 加购物车

1.1 This specification covers single-cell precast reinforced concrete box sections intended to be used for the construction of culverts and for the conveyance of storm water, industrial wastes, and sewage.1.2 This metric specification is equivalent to C789 is compatible in technical content.Note 1-This specification is primarily a manufacturing and purchasing specification. However, standard designs are included and the criteria used to develop these designs are given in the Appendixes. The successful performance of this product depends upon the proper selection of the box section, bedding, backfill, and care that the installation conforms to the construction specifications. The owner of the precast reinforced concrete box sections specified herein is cautioned that he must properly correlate the loading conditions and the field requirements with the box section specified and provide for inspection at the construction site.Note 2-Specification C850M is to be used for box sections with less than 0.6 m of cover subjected to highway loading.

定价： 0元 / 折扣价： 0 元

1.1 This specification covers single-cell pre-cast reinforced concrete box sections intended to be used for the construction of culverts and for the conveyance of storm water, industrial wastes, and sewage. 1.2 This metric specification is equivalent to C789 and is compatible in technical content. Note 1-This specification is primarily a manufacturing and purchasing specification. However, standard designs are included and the criteria used to develop these designs are given in the Appendixes. The successful performance of this product depends upon the proper selection of the box section, bedding, backfill, and care that the installation conforms to the construction specifications. The owner of the precast reinforced concrete box sections specified herein is cautioned that he must properly correlate the loading conditions and the field requirements with the box section specified and provide inspection at the construction site. Note 2-Specification C850M is to be used for box sections with less than 0.6 m of cover subjected to highway loading.

定价： 0元 / 折扣价： 0 元

4.1 This practice assists users in selecting appropriate performance characteristics of corrugated fiberboard or box construction, or both, commensurate with their user’s needs for packing and distribution of goods. This practice describes several attributes of fiberboard and boxes which relate to various hazards encountered in distribution and describes test parameters which may be specified by the user to ensure sufficient strength in the box for containment, storage, handling, transport and protection of contents.4.2 The user should specify only those attributes and related tests which are required for performance to the users satisfaction including their operations and distribution cycle(s). When using the carriers’packaging rules as the major basis for developing specifications, the reason for the rule and its function and importance should be understood. As previously stated, rules and regulations may be exceeded and should be when the minimum specifications are inadequate for the full effects of the distribution cycle, etc.. If the user decides to employ box compression strength or a rough handling performance protocol as the overriding specification, it should be noted that all minimum standards required by various organizations shall also be met or surpassed if using the related certificate. These minimum standards can be stated in the box drawing so as to ensure adherence to rules and regulations. If a Box Manufacturer’s Certificate (BMC) is printed on the box, then the ECT or Mullen Burst/Basis Weight values shall meet or exceed the minimum requirements for size and weight of the packaged product.4.3 See Appendix X7 for several examples of specification determinations.1.1 This practice provides information on corrugated fiberboard for the prospective user who wants guidance in selecting attributes of materials and box construction based on performance requirements. These attributes should be part of specifications which establish levels of the qualities a shipping container shall have achieved in order to be acceptable to the purchaser or user. The attributes and qualities should be testable, using standard methods that are recognized by both the buyer and seller. This practice will assist users in developing specifications for corrugated containers through an analysis of performance requirements and subsequent relationships to fiberboard materials and box construction attributes. This practice is meant to complement the box buyer–box manufacturer relationship by having the buyer (user) better understand, discuss, and negotiate needed elements of box design and specification. The full box design process is complex, and it is beyond the scope of this standard.1.2 The attributes and their levels should be based on the intended use of the box, including the handling and environment it will encounter. Many packaging rules include detailed descriptions of the materials that may be used and style, closure, or other construction details of allowed shipping containers. These rules are presented as minimum requirements; they may be exceeded for functional reasons, but there is no regulatory reason to do so. Rail and motor freight classifications applicable for surface common carrier transportation have established minimum requirements for certain attributes of corrugated packaging. These may or may not be appropriate for application in the complete distribution system, as they encompass only containerboard or combined corrugated board — not finished boxes — and are not intended to provide for the distribution and storage system beyond the transportation segment.1.2.1 The attribute levels contained herein are based on U.S. practice and specifications. Some attributes such as flute dimensions and basis weights may be defined differently in other countries.1.3 There are four common methods used for specifying boxes.1.3.1 A common approach is to examine boxes currently in use for the specific application and to make a similar or modified version of that box, given that it has a proven performance record. This method, while quite efficient, and fast, does not lead to box optimization based on characterization by end use. This method can lead to overdesign.1.3.2 A second common approach is to estimate the compression strength necessary for a box at the bottom of a stack of boxes to totally support the anticipated load. A safety factor, F, is calculated from the expected environmental hazards that are anticipated in storage and shipping. A minimum initial box compression, as measured by Test Method D642 is determined using the weight on the bottom box and the F factor, see 8.3. Then engineering principles are used to select material combinations based on material characteristics such as caliper, edge crush value, and flat crush to meet that requirement.1.3.3 The third approach may be used when the box application has product support sufficient to meet anticipated compression requirements, therefore the board structural requirements are focused on protection and containment. Mullen burst values can be one of these measures for this category of box if the user has determined that a minimum burst value is the main metric required in their distribution system. In this case, total weight per box allowable per carrier rules may be higher than would be expected based on expected predicted compression strength, safety factor, and board combination used. See 7.2 – 7.2.2.2 and 8.2.1.1.3.4 The fourth approach may be used when the box is intended for single parcel shipment of high value or hazardous materials, where there can be a compression requirement but most often the performance attributes required are toughness as measured by drop and impact resistance, see 8.2. A means of gaining confidence that a box in this category will function properly in its intended distribution environment is to test the box using some sort of rough handling performance protocol such as Practice D4169 or ISTA 3 Series: General Simulation Performance Tests.1.3.5 Using material specifications to define a box does not guarantee the box will be well made. For example, the best possible material could be used for making a box, but if the score lines are too deep or too shallow, or if the manufacturer’s joint is not secured correctly, the box will fail in distribution. All proposed constructions and designs should be vetted by means of a process of samples, testing, prototype packing and shipping. Only once a construction has been proven to work across a range of anticipated end use conditions should it be approved for normal production.1.4 Corrugated containers for packaging of hazardous materials for transportation shall comply with federal regulations administered by the U.S. Department of Transportation (Code of Federal Regulations, Title 49).1.5 Lists and Descriptions of Performance and Material Characteristics and Related Test Procedures—For further information on the development of performance-based specifications, please refer to the sections on Specifications and Test Procedures of the Fibre Box Handbook.1.6 The values stated in both SI and inch-pound units are to be regarded separately as standard. Within the text, the inch-pound units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other.1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 646元 / 折扣价： 550 元 加购物车

AbstractThese test methods cover production and acceptance tests for concrete pipes, manhole sections, and tiles. Tests include procedures for evaluating external load crushing strength, flat slab top, core strength, absorption, hydrostatic, permeability, manhole step, cylinder, gasket lubricant, joint shear, alkalinity, and gasket measurements. Aside from the procedures, this standard also details the significance and use of and the required test apparatus for each test.1.1 These test methods cover testing of concrete pipe, concrete box sections, manhole sections, and tile. The test methods described are used in production testing and acceptance testing to evaluate the properties provided for in the specifications.1.2 The test methods appear in the following order:  SectionExternal Load Crushing Strength 4Flat Slab Top 5Base Section Test Method 6Core Strength 7Absorption 8Hydrostatic 9Permeability 10Manhole Step 11Cylinder Strength 12Gasket Lubricant 13Joint Shear 14Alkalinity 15Gasket Measurements 16Off-Center Hydrostatic Joint Test 17Hydrostatic External Joint Test Method 18Welded Splice Pull Test 191.3 The test specimens shall not have been exposed to a temperature below 40°F for the 24 h immediately preceding the test.1.4 If any test specimen fails because of mechanical reasons such as failure of testing equipment or improper specimen preparation, it shall be discarded and another specimen taken.1.5 Specimens shall be selected in accordance with the specifications for the type of pipe or tile being tested.1.6 A complete metric companion to Test Methods C497 has been developed—C497M; therefore, no metric equivalents are presented in these methods.1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 646元 / 折扣价： 550 元 加购物车

AbstractThese test methods cover production and acceptance tests for concrete pipes, manhole sections, and tiles. Tests include procedures for evaluating external load crushing strength, flat slab top, core strength, absorption, hydrostatic, permeability, manhole step, cylinder, gasket lubricant, joint shear, alkalinity, and gasket measurements. Aside from the procedures, this standard also details the significance and use of and the required test apparatus for each test.1.1 These test methods cover testing of concrete pipe, concrete box sections, manhole sections, and tile. The test methods described are used in production testing and acceptance testing to evaluate the properties provided for in the specifications.1.2 The test methods appear in the following order:  SectionExternal Load Crushing Strength 4Flat Slab Top 5Base Section Test 6Core Strength 7Absorption 8Hydrostatic 9Permeability 10Manhole Step 11Cylinder 12Gasket Lubricant 13Joint Shear 14Alkalinity 15Gasket Measurements 16Off-Center Hydrostatic Joint Test 17Hydrostatic External Joint Test Method 18Welded Splice Pull Test 191.3 The test specimens shall not have been exposed to a temperature below 4°C for the 24 h immediately preceding the test.1.4 If any test specimen fails because of mechanical reasons such as failure of testing equipment or improper specimen preparation, it shall be discarded and another specimen taken.1.5 Specimens shall be selected in accordance with the specifications for the type of pipe or tile being tested.1.6 These methods are the metric companion of Test Methods C497.1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 646元 / 折扣价： 550 元 加购物车

This specification covers single-cell precast reinforced concrete box sections cast monolithically and intended to be used for the construction of culverts and for the conveyance of storm water, industrial wastes and sewage. The reinforced concrete shall consist of cementitious materials, mineral aggregates and water, in which steel has been embedded in such a manner that the steel and concrete act together. The precast reinforced concrete box sections shall be produced with tongue and groove ends. The box section shall be cured using any of the following methods or combinations thereof: steam curing; water curing; and membrane curing. Compression tests for determining concrete compressive strength shall be allowed to be made on either standard rodded concrete cylinders or concrete cylinders compacted and cured in like manner as the box sections, or on cores drilled from the box section.1.1 This specification covers single-cell precast reinforced concrete box sections cast monolithically and intended to be used for the construction of culverts and for the conveyance of storm water, industrial wastes and sewage.NOTE 1: This specification is primarily a manufacturing and purchasing specification. However, standard designs per the AASHTO LRFD Bridge Design Specifications are included and the criteria used to develop these designs are given in Appendix X1. The successful performance of this product depends upon the proper selection of the box section, bedding, backfill, and care that the installation conforms to the construction specifications. The purchaser of the precast reinforced concrete box sections specified herein is cautioned that proper correlation of the loading conditions and the field requirements with the box section specified, and provision for inspection at the construction site, are required.1.2 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

定价： 843元 / 折扣价： 717 元 加购物车

1.1 This specification covers single-cell, precast reinforced concrete box sections with less than 2 ft of cover subjected to highway loadings and intended to be used for the construction of culverts and for the conveyance of storm water, industrial wastes, and sewage. 1.2 A complete metric companion to Specification C850 has been developed-C850M; therefore, no metric equivalents are presented in this specification. Note 1-This specification is primarily a manufacturing and purchasing specification. However, standard designs are included and the criteria used to develop these designs are given in Appendix X1. The successful performance of this product depends upon the proper selection of the box section, bedding, backfill, and that the installation conforms to the construction specifications. The owner of the precast reinforced concrete box sections specified herein is cautioned that he must correlate the loading conditions and the field requirements with the box section specified and provide inspection at the construction site.Note 2-Specification C789 is to be used for box sections subjected to highway loading with 2 ft or more earth cover, or subjected to dead load only.

定价： 0元 / 折扣价： 0 元

1.1 This specification covers single-cell, precast reinforced concrete box sections with less than 0.6 m of cover subjected to highway loadings and intended to be used for the construction of culverts and for the conveyance of storm water, industrial wastes, and sewage. 1.2 This metric specification is equivalent to C850 and is compatible in technical content. Note 1-This specification is primarily a manufacturing and purchasing specification. However, standard designs are included and the criteria used to develop these designs are given in Appendix X1. The successful performance of this product depends upon the proper selection of the box section, bedding, backfill, controlled manufacture in the plant, and care that the installation conforms to the construction specifications. The owner of the precast reinforced concrete box sections specified herein is cautioned that he must properly correlate the loading conditions and the field requirements with the box section specified and provide inspection at the construction site. Note 2-Specification C789M is to be used for box sections subjected to highway loading with 0.6 m or more earth cover, or subjected to dead load only.

定价： 0元 / 折扣价： 0 元