1.1 该试验方法测量胶结材料水化引起的水硬性水泥浆体的内部（绝对）体积变化。这种体积变化被称为 化学收缩 。 1.1.1 步骤A，容量法。 1.1.2 程序B，密度法。 1.2 以国际单位制表示的数值应视为标准。 1.3 本标准并不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。 ( 警告 --新鲜的水硬性胶结混合物具有腐蚀性，长时间暴露可能会对皮肤和组织造成化学灼伤。 2. ) 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====== 4.1 胶凝材料的许多性能受其初始水化速率的控制。示例包括早期强度发展、热释放和抗裂性。通过测量水泥浆体在水化过程中的化学收缩，提供了这种初始水化速率的一种直接而方便的测量方法。作为水泥水合物，水化产物比初始反应材料（水泥和水）占据的体积更小。 由于这种体积变化，在可用的情况下，水合水泥浆会吸收周围环境中的水。在早期，这种吸附与已经发生的水合量成正比。 5. 这种方法是基于盖克提出的方法。 6. 这些结果与理解水泥的水化行为有关。该方法不测量与化学收缩相关的体积变化（自收缩），也不测量使用评估水泥生产的混凝土的开裂潜力。

1.1 This test method measures the internal (absolute) volume change of hydraulic cement paste that results from the hydration of the cementitious materials. This volume change is known as chemical shrinkage . 1.1.1 Procedure A, volumetric method. 1.1.2 Procedure B, the density method. 1.2 The values stated in SI units are to be regarded as 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. ( Warning —Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure. 2 ) 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 ====== 4.1 Numerous properties of cementitious materials are controlled by their initial hydration rate. Examples include early-age strength development, heat release, and crack resistance. One direct and convenient measure of this initial hydration rate is provided by the measurement of the chemical shrinkage of the cement paste during its hydration. As cement hydrates, the hydration products occupy less volume than the initial reacting materials (cement and water). Due to this volume change, a hydrating cement paste will sorb water from its immediate surroundings, when available. At early times, this sorption is in direct proportion to the amount of hydration that has occurred. 5 This method is based on the one developed by Geiker. 6 The results are relevant to understanding the hydration behavior of cements. This method does not measure the bulk volume changes (autogenous shrinkage) associated with chemical shrinkage nor the cracking potential of concretes produced with the evaluated cement.