1.1 本试验方法包括测定玻璃纤维混凝土薄片的干体积密度、湿体积密度、吸水率和表观孔隙率。 注1: 该试验方法不涉及绝对比重的测定。因此，在指定的干燥过程中没有清空或在指定的浸泡过程中没有装满水的试样中可能存在的孔隙空间被认为是“不可渗透的”，并且在计算时与试样的固体部分没有区别，尤其是空隙百分比。 根据试样的孔径分布和孔隙进入半径以及所需测试结果的目的，该方法的程序可能足够，也可能不够严格。在希望填充比通过浸渍填充更多的孔的情况下，可以使用包括使用真空处理或增加压力的各种技术。 如果需要对总孔隙空间进行严格测量，则只能通过首先将样品还原为离散颗粒来确定绝对比重来获得，每个离散颗粒都足够小，从而在任何颗粒内都不存在不可渗透的空间。 1.2 以英寸磅为单位的数值应视为标准。括号中给出的值是国际单位制的数学转换，仅供参考，不被视为标准。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 2.1 通过该试验方法确定的材料性能有助于玻璃纤维混凝土的质量控制、确定是否符合相关规范以及研发。

1.1 This test method covers the determinations of dry and wet bulk density, water absorption, and apparent porosity of thin sections of glass-fiber reinforced concrete. Note 1: This test method does not involve a determination of absolute specific gravity. Therefore, such pore space as may be present in the specimen that is not emptied during the specified drying or is not filled with water during the specified immersion is considered “impermeable” and is not differentiated from the solid portion of the specimen for the calculations, especially those for percent voids. Depending upon the pore size distribution and the pore entry radii of the specimen and on the purposes for which the test results are desired, the procedures of this method may be adequate, or they may be insufficiently rigorous. In the event that it is desired to fill more of the pores than will be filled by immersion, various techniques involving the use of vacuum treatment or increased pressure may be used. If a rigorous measure of total pore space is desired, this can only be obtained by determining absolute specific gravity by first reducing the sample to discrete particles, each of which is sufficiently small so that no impermeable space can exist within any of the particles. 1.2 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. 1.3 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. ====== Significance And Use ====== 2.1 Material properties determined by this test method are useful for quality control of glass-fiber reinforced concrete, ascertaining compliance with governing specifications, and research and development.