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定价： 605元 / 折扣价： 515 元

定价： 605元 / 折扣价： 515 元

定价： 481元 / 折扣价： 409 元

定价： 481元 / 折扣价： 409 元

定价： 345元 / 折扣价： 294 元 加购物车

定价： 481元 / 折扣价： 409 元 加购物车

定价： 481元 / 折扣价： 409 元 加购物车

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This guide describes the procedures for evaluating and calibrating friction measurement systems known as Continuous Friction Measuring Equipment (CFMEs) using the specialized equipment, instruments, pavement surfaces, trained personnel, and approved facilities. It serves as a process to identify and quantify the variables that affect system performance, to minimize the effect of these variables, and to provide a means to relate CFMEs to reference skid measurement systems. The standard covers the apparatus to be used in evaluation and calibration, physical measurements, static force evaluation and calibration, tire pressure gauge calibration, speed and distance calibration, slip ratio or yaw angle verification, water flow and distribution, force plate calibration, final testing and reporting, documentation, reporting of results, and frequency of system correlation and calibration.1.1 This guide describes the evaluation and calibration of friction measurement systems which are known as Continuous Friction Measuring Equipment (CFMEs). The evaluation and calibration processes, using the specialized equipment, instruments, pavement surfaces, trained personnel, and approved facilities, are performed using the procedures described below.1.2 This guide is offered as a process to identify and quantify the variables that affect system performance, to minimize the effect of these variables, and to provide a means to relate CFMEs to reference skid measurement systems.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 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

5.1 The procedure described in this practice is used to design OGFC asphalt mixtures that will provide good performance in terms of permeability (tending to reduce hydroplaning and potential for skidding) and durability when subjected to high volumes of traffic.1.1 This practice covers the mix design of open-graded friction course (OGFC) using the Superpave Gyratory Compactor (SGC) or other suitable forms of compaction. The OGFC asphalt mixture design is based on the volumetric properties of the asphalt mixture in terms of air voids and the presence of stone-on-stone contact. Information found in Guide D6932/D6932M should be reviewed before starting the mix design. Where applicable, Specification D3666 should be applied as a minimum for agencies testing and inspecting road and paving materials.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 nonconformance 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： 590元 / 折扣价： 502 元 加购物车

定价： 515元 / 折扣价： 438 元 加购物车

定价： 590元 / 折扣价： 502 元 加购物车

定价： 590元 / 折扣价： 502 元 加购物车