This specification covers five grades of aluminum-coated, steel wire strand composed of a number of round, steel wires, with aluminum coatings, for use as guys, messengers, span wires, and for similar purposed. The five grades are as follows: (1) utilities; (2) common; (3) Siemens-Martin; (4) high-strength; and (5)extra high-strength. The base metal shall be steel made by any commercially steel making process, The ingot or pig aluminum used for coating shall conform to the required impurity limits of copper and iron. All wires shall be stranded with uniform tension. Physical tests shall be performed wherein the steel wire strands shall conform to the required values of breaking strength. The steel specimens shall also conform to the required values of elongation, diameter and weight of coating.1.1 This specification covers five grades of aluminum-coated, steel wire strand, composed of a number of round, steel wires, with aluminum coatings, for use as guys, messengers, span wires, and for similar purposes.1.2 The five grades covered are as follows:1.2.1 Utilities,1.2.2 Common,1.2.3 Siemens-Martin,1.2.4 High-Strength, and1.2.5 Extra High-Strength.1.3 Minimum breaking strengths of strand for each grade are specified in Table 1.1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.1.5 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 five grades of zinc-coated, steel wire strand, composed of a number of round, steel wires, with four weights of zinc coatings, suitable for use as guys, messengers, span wires, and for similar purposes. The five grades covered are as follows: utilities, common, Siemens-Martin, high-strength, and extra high-strength. The base metal shall be steel made by any commercially accepted steel making process and of such quality and purity that, when drawn to the size of wire specified and coated with zinc, the finished strand and the individual wires shall be of uniform quality and have the properties and characteristics as prescribed in this specification. Strands shall have a left lay and all wires shall be stranded with uniform tension and be sufficiently close. The finished strand shall meet the requirements according to the specified approximate weight per unit length of strand against minimum breaking strength, elongation, and ductility of steel. The zinc-coated wire shall be capable of being wrapped in a close helix without cracking or delaminating the zinc coating. Joints in the wires composing the strand shall be either the brazed-lap type or electric-butt-welded type shall be coated with zinc after completion so that the joints have protection from corrosion equivalent to that of the zinc-coated wire itself.1.1 This specification covers five grades of metallic-coated, steel wire strand, composed of a number of round, steel wires, with four weights of metallic coatings, and four types of metallic coatings, suitable for use as guys, messengers, span wires, and for similar purposes.1.2 The five grades covered are as follows:1.2.1 Utilities,1.2.2 Common,1.2.3 Siemens-Martin,1.2.4 High-Strength, and1.2.5 Extra High-Strength.1.2.6 Minimum breaking strengths of strand for each grade are described in Section 7.1.3 The four weights of metallic coatings are: Class 1 and Classes A, B, and C. Minimum weights of metallic coatings are described in Section 10.1.4 The four types of metallic coatings are type 1, 2, 5, and 10 as defined in Section 3.1.5 Units—The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.1.6 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.1.7 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

4.1 This specification addresses minimum performance criteria for adhesives used to laminate oriented strand board (OSB) structural panel facing material to expanded or extruded polystyrene core materials. Adhesive performance is based on tests that simulate exposure to moisture, temperature, seasonal weathering, and creep. Additionally, the adhesive is to demonstrate resistance to oxidation, mold, chemical reagents, and compatibility to the specific laminating materials.4.2 The adhesive manufacturers can use this specification for new product development and quality control purposes.4.3 Structural insulated panel manufacturers rely on an adhesive performance specification that determines its suitability before use.4.4 Performance of the SIP adhesive when evaluated in accordance with this specification aids in determining the suitability of the adhesive for laminating OSB facings to rigid cellular polystyrene core materials in the manufacture of structural insulated panels.AbstractThis specification addresses the physical, chemical and test requirements for structural insulated panel (SIP) adhesives suitable for the bonding of oriented strand boards (OSB) to rigid cellular polystyrene thermal insulation core materials for general structural use. Douglas-fir to Douglas-fir assemblies shall pass the following qualification requirements when tested in accordance with referenced ASTM documents enumerated herein: block shear strength (dry shear, soak/re-dry, oxidation resistance, and mold resistance); tensile strength (dry tensile bond strength, soak/re-dry, and mold resistance); and creep resistance. OSB to core to OSB assemblies shall, alternatively, be tested and pass shear strength and tensile (flat wise) bond strength requirements as well.1.1 This specification is designed to evaluate adhesives suitable for the bonding of oriented strand board (OSB) to rigid cellular polystyrene insulation core materials for general structure use.1.2 The requirements of the structural insulated panel (SIP) adhesive are based on the performance of the adhesive as measured by:1.2.1 Resistance to shear by compression loading in ambient conditions and after accelerated aging.1.2.2 Resistance to tensile loading in ambient conditions and after accelerated aging.1.2.3 Resistance to creep (deformation) under static load in ambient conditions and after accelerated aging.1.2.4 Tensile and shear strength to polystyrene core materials.1.3 The classification of the adhesive formulation is based on, but not limited to the adhesive’s industry accepted generic names, for example: phenol-resorcinol, emulsion polymer isocyanate, one and two-part urethane. The type of adhesive application and curing terminology are also usually included for classification purposes such as cold-setting phenol resorcinol, heat-cured phenol resorcinol, and hot melt one component urethane.1.4 Evaluation of adhesive performance at high temperature conditions, such as during a fire exposure, is beyond the scope of this specification.1.5 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.1.6 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 and health practices and determine the applicability of regulatory limitations prior to use.1.7 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

1.1 This specification covers low-relaxation, seven-wire, Grade 240 [1655], stainless steel strand for use in prestressed concrete construction. Grade 240 [1655] has a minimum tensile strength of 240 ksi [1655 MPa] based on the nominal area of the strand.1.2 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables) shall not be considered as requirements of the specification.1.3 This specification is applicable for orders in either inch-pound units (as Specification A1114) or in SI units (as Specification A1114M).1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with this specification, each system shall be used independently of the other, and values from the two systems shall not be combined.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 five grades of zinc-5 % aluminum-mischmetal (Zn-5 Al-MM) alloy-coated, steel wire strand, composed of a number of round, steel wires, with four weights of Zn-5 Al-MM alloy coatings, suitable for use as guys, messengers, span wires, and for similar purposes. The five grades covered are: utilities; common; Siemens-Martin; high-strength; and extra high-strength. The four weights covered here are Classes 1, A, B, and C. The base metal shall be steel made by any commercially accepted steel making process. The bath metal used in continuous hot-dip Zn-5 Al-MM alloy-coating shall meet the chemical composition limits specified. The determination of chemical composition shall be made in accordance to the required specifications. Breaking strength test, elongation test, and ductility test shall be made to conform to the requirements specified.1.1 This specification covers five grades of zinc-5 % aluminum-mischmetal (Zn-5 Al-MM) alloy-coated, steel wire strand, composed of a number of round, steel wires, with four weights of Zn-5 Al-MM alloy coatings, suitable for use as guys, messengers, span wires, and for similar purposes. The product is intended for applications requiring corrosion resistance and formability.1.2 The five grades covered are as follows:1.2.1 Utilities,1.2.2 Common,1.2.3 Siemens-Martin,1.2.4 High-strength, and1.2.5 Extra high-strength,1.2.6 Minimum breaking strengths of strand for each grade are described in Section 7.1.3 The four weights of coatings are: Class1 and Classes A, B, and C. Minimum weights of Zn-5 Al-MM alloy are described in Section 10.1.4 This specification is applicable to orders in either inch-pound units (as A855) or acceptable SI units (as A855M). Inch-pound units and SI units are not necessarily equivalent.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： 590元 / 折扣价： 502 元 加购物车

5.1 A common result of cellular stress is an increase in DNA damage. DNA damage may be manifest in the form of base alterations, adduct formation, strand breaks, and cross linkages (19). Strand breaks may be introduced in many ways, directly by genotoxic compounds, through the induction of apoptosis or necrosis, secondarily through the interaction with oxygen radicals or other reactive intermediates, or as a consequence of excision repair enzymes (20-22). In addition to a linkage with cancer, studies have demonstrated that increases in cellular DNA damage precede or correspond with reduced growth, abnormal development, and reduced survival of adults, embryos, and larvae (16, 23, 24).5.1.1 The Comet assay can be easily utilized for collecting data on DNA strand breakage (9, 25, 26). It is a simple, rapid, and sensitive method that allows the comparison of DNA strand damage in different cell populations. As presented in this guide, the assay facilitates the detection of DNA single strand breaks and alkaline labile sites in individual cells, and can determine their abundance relative to control or reference cells (9, 16, 26). The assay offers a number of advantages; damage to the DNA in individual cells is measured, only extremely small numbers of cells need to be sampled to perform the assay (<10 000), the assay can be performed on practically any eukaryotic cell type, and it has been shown in comparative studies to be a very sensitive method for detecting DNA damage (2, 27) .5.1.2 These are general guidelines. There are numerous procedural variants of this assay. The variation used is dependent upon the type of cells being examined, the types of DNA damage of interest, and the imaging and analysis capabilities of the lab conducting the assay. To visualize the DNA, it is stained with a fluorescent dye, or for light microscope analysis the DNA can be silver stained (28). Only fluorescent staining methods will be described in this guide. The microscopic determination of DNA migration can be made either by eye using an ocular micrometer or with the use of image analysis software. Scoring by eye can be performed using a calibrated ocular micrometer or by categorizing cells into four to five classes based on the extent of migration (29, 30) . Image analysis systems are comprised of a CCD camera attached to a fluorescent microscope and software and hardware designed specifically to capture and analyze images of fluorescently stained nuclei. Using such a system, it is possible to measure the fluorescence intensity and distribution of DNA in and away from the nucleus (8). Using different procedural variants, the assay can be utilized to measure specific types of DNA alterations and DNA repair activity (1, 3, 8, 10, 13, 14, 17, 18). Alkaline lysis and electrophoresis conditions are used for the detection of single-stranded DNA damage, whereas neutral pH conditions facilitate the detection of double-strand breaks (31). Various sample treatments can be used to express specific types of DNA damage, or as in one method, to preserve strand damage at sites of DNA repair (10). Nuclease digestion steps can be used to introduce strand breaks at specific lesion sites. Using this approach, oxidative base damage can be detected by the use of endonuclease III (18), as well as DNA modifications resulting from exposure to ultraviolet light (UV) through the use of T4 endonuclease V (3). Modifications of this type vastly expand the utility of this assay and are good examples of its versatility.5.2 A sufficient knowledge of the biology of cells examined using this assay should be attained to understand factors affecting DNA strand breakage and the distribution of this damage within sampled cell populations. This includes, but is not limited to, influences such as cell type heterogeneity, cell cycle, cell turnover frequency, culture or growth conditions, and other factors that may influence levels of DNA strand damage. Different cell types may have vastly different background levels of DNA single-strand breaks due to variations in excision repair activity, metabolic activity, anti-oxidant concentrations, or other factors. It is recommended that cells representing those to be studied using the SCG/Comet assay be examined under the light or fluorescent microscope using stains capable of differentially staining different cell types. Morphological differences, staining characteristics, and frequencies of the different cell types should be noted and compared to SCG/Comet damage profiles to identify any possible cell type specific differences. In most cases, the use of homogenous cell populations reduces inter-cell variability of SCG/Comet values. The procedures for this assay, using cells from many different species and cell types, have been published previously (1, 2, 3, 5, 8, 10, 13, 14, 17, 18, 32-38). These references and others should be consulted to obtain details on the collection, handling, storage, and preparation of specific cell types.5.3 The experimental design should incorporate appropriate controls, reference samples, and replicates to delineate the influence of the major sources of experimental variability.1.1 This guide covers the recommended criteria for performing a single-cell gel electrophoresis assay (SCG) or Comet assay for the measurement of DNA single-strand breaks in eukaryotic cells. The Comet assay is a very sensitive method for detecting strand breaks in the DNA of individual cells. The majority of studies utilizing the Comet assay have focused on medical applications and have therefore examined DNA damage in mammalian cells in vitro and in vivo (1-4).2 There is increasing interest in applying this assay to DNA damage in freshwater and marine organisms to explore the environmental implications of DNA damage.1.1.1 The Comet assay has been used to screen the genotoxicity of a variety of compounds on cells in vitro and in vivo (5-7), as well as to evaluate the dose-dependent anti-oxidant (protective) properties of various compounds (3, 8-11). Using this method, significantly elevated levels of DNA damage have been reported in cells collected from organisms at polluted sites compared to reference sites (12-15). Studies have also found that increases in cellular DNA damage correspond with higher order effects such as decreased growth, survival, and development, and correlate with significant increases in contaminant body burdens (13, 16).1.2 This guide presents protocols that facilitate the expression of DNA alkaline labile single-strand breaks and the determination of their abundance relative to control or reference cells. The guide is a general one meant to familiarize lab personnel with the basic requirements and considerations necessary to perform the Comet assay. It does not contain procedures for available variants of this assay, which allow the determination of non-alkaline labile single-strand breaks or double-stranded DNA strand breaks (8), distinction between different cell types (13), identification of cells undergoing apoptosis (programmed cell death, (1, 17)), measurement of cellular DNA repair rates (10), detection of the presence of photoactive DNA damaging compounds (14), or detection of specific DNA lesions (3, 18) .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 guide is arranged as follows:  Section  1Referenced Documents 2Terminology 3Summary of Guide 4 5Equipment and Reagents 6Assay Procedures 7Treatment of Data 8Reporting Data 9Keywords 10Annex Annex A1References  1.5 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 filled epoxy-coated seven-wire prestressing steel strands with protective fusion-bonded epoxy coating applied by the electrostatic deposition method. This specification also covers relaxation loss limits for filled epoxy coated strands. Prestressing steel strands shall be free of contaminants such as oil, grease, or paint. Steel strand surfaces shall be cleaned to meet coating requirements, such as coating thickness, coating continuity, coating adhesion, coating composition, and coating bond with concrete or grout. Smooth or grit-impregnated coating shall be applied by the electrostatic deposition method or other method that will meet the coating requirements. Pullout tests shall be performed three times annually or maybe repeated if the coating failed to meet the requirements.1.1 This specification covers seven-wire steel prestressing strand with protective fusion-bonded epoxy powder coating applied by the electrostatic deposition method or other suitable method, with the interstices of the seven wires filled with epoxy to minimize migration of corrosive media, either by capillary action or other hydrostatic forces.NOTE 1: The manufacturer as identified throughout this specification is the coating applicator.1.2 A supplementary requirement (S1) is provided for use where bond strength testing of 0.600-in. [15.24-mm] diameter grade 270 [1860] epoxy-coated strand for applications in prestressed ground anchors is required by the purchaser. The supplementary requirement applies only when specified in the purchase order or contract.1.3 Requirements for epoxy powder coatings are contained in Annex A1.1.4 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables) shall not be considered as requirements of the specification.1.5 This specification is applicable for orders in either inch-pound units (as Specification A882) or SI units [as Specification A882M].1.6 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. 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 specification.1.7 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： 702元 / 折扣价： 597 元 加购物车

This specification covers seven-wire uncoated, indented, stress-relieved carbon steel strands for use in pre-stressed concrete construction. Wire dimensions, indentations, and mechanical properties shall be in accordance to the values specified in this specification. The carbon steel strand is produced to satisfy only the specified mechanical properties, this specification contains no information on the chemical composition of the wires.1.1 This specification covers two types and two grades of indented seven-wire uncoated, steel strand for use in prestressed concrete construction. The two types of strand are low-relaxation and stress-relieved (normal-relaxation). Grade 250I [1725I] and Grade 270I [1860I] have minimum tensile strengths of 250 ksi [1725 MPa] and 270 ksi [1860 MPa], respectively, based on the nominal area of the strand.1.2 This specification is applicable for orders in either inch-pound units (as Specification A886) or in SI units (as Specification A886M).1.3 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI 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. Combining values from the two systems may result in non-conformance with the specification.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

This specification covers zinc-coated parallel and helical steel wire structural strands for use where a high-strength, high-modulus, multiple-wire tension member is desired as a component part of a structure. Breaking strength is expressed as Grade 1 or 2, while, coating weight is expressed as Class A, B, or C. Strands shall be furnished with Class A weight zinc-coated wires throughout, but may be furnished with Class B or C weight wires as well where additional corrosion protection is required. The base metal shall be carbon steel manufactured by the open-hearth, basic-oxygen, or electric-furnace process Finished strands and the hard-drawn individual zinc-coated wires shall be coated by the hot-dip or electrolytic process. Specimens shall be tested and conform to values of the following physical requirements: nominal diameter, stress at specified extension under load, tensile strength, total elongation, ductility, and coating weight and adherence.1.1 This specification covers metallic-coated steel wire structural strand, for use where a high-strength, high-modulus, multiple-wire tension member is desired as a component part of a structure. The strand is available with parallel or helical wire construction.1.1.1 The strand is available with several metallic coating classes and with two strength grades, as described in Section 4.1.2 The strand is furnished with Class A weight zinc or zinc-aluminum alloy-coated wires throughout. It can be furnished with Class B weight or Class C weight zinc-coated outer wires as an option.1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.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： 590元 / 折扣价： 502 元 加购物车

This specification covers minimum performance standards and test requirements for gap-filling construction adhesives for field-gluing plywood to lumber framing for floor systems. The adhesive shall conform to the strength and durability properties prescribed. The different methods for specimen's preparation are presented in details. The shear strength, gap-filling effect on strength, and durability shall be tested to meet the requirements prescribed.1.1 This specification covers minimum performance standards and test requirements for gap-filling construction adhesives for bonding wood structural panels consisting of plywood or oriented strand board (OSB) to wood based floor system framing, particularly dimension lumber or wood I-joists, at the construction site.1.2 This specification provides a basis for ensuring the quality of the adhesives and is not intended as an application specification.1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.1.4 The following precautionary caveat pertains only to the test method portion, Section 11, of this specification: 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.1.5 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