1.1 本规程包括根据试验方法制作和养护试样的程序，以评估正常重量粗骨料在加气混凝土中的抗冻融性 C666/C666M ，程序A或B。 1.2 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值可能不是精确的等效值；因此，每个系统应相互独立使用。将两个系统的值合并可能会导致不符合标准。 1.3 本规程无意解决与其使用相关的所有安全问题（如有）。 本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ( 警告 -新鲜的水硬性水泥基混合物具有腐蚀性，长时间使用可能导致皮肤和组织化学烧伤。 2. ) ====意义和用途====== 4.1 本实施规程提供了混凝土配比的标准要求，以及根据试验方法制备和调节适用于评估加气混凝土中粗骨料在冻融条件下耐久性的试样的标准要求 C666/C666M . 4.2 如果混凝土中含有严重饱和的粗骨料，则具有足够空隙系统的混凝土可能不耐冻融。当没有足够的未填充孔隙空间来容纳伴随冻结的水膨胀时，骨料颗粒被认为是临界饱和的。

1.1 This practice covers procedures for making and curing test specimens for evaluating resistance of normal-weight coarse aggregates to freezing and thawing in air-entrained concrete in accordance with Test Method C666/C666M , Procedure A or B. 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 practice does not purport to address all 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. ( Warning —Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged use. 2 ) ====== Significance And Use ====== 4.1 This practice provides standard requirements for proportioning concrete, and for preparing and conditioning test specimens suitable for evaluating the durability of coarse aggregate in air-entrained concrete subjected to freezing and thawing in accordance with Test Method C666/C666M . 4.2 Concrete having an adequate air-void system may not be resistant to freezing and thawing if it contains coarse aggregate that becomes critically saturated. An aggregate particle is considered to be critically saturated when there is insufficient unfilled pore space to accommodate the expansion of water that accompanies the freezing.