本指南涵盖了水泥对混凝土性能的影响，总结了商用水硬性水泥的组成和可用性，以及影响其在混凝土中性能的因素。水泥是混凝土中最活跃的成分，通常单位成本最高；因此，它的选择和正确使用对于实现特定混凝土混合物的性能和成本的理想平衡至关重要。选择时应考虑与所需混凝土性能相关的水泥性能。其中包括对水泥类型的讨论，对水泥化学的简要回顾，化学外加剂和辅助胶凝材料的影响，以及环境对水泥性能的影响，以及对硅酸盐水泥使用和制造的可持续性方面的回顾。讨论了水硬性水泥的储存、交付、取样和测试是否符合规范。 用户将学会识别随时可用的通用水泥何时能令人满意地发挥作用，或何时需要选择满足额外要求的水泥。

This guide covers the influence of cement on the properties of concrete, summarizing the composition and availability of commercial hydraulic cements and the factors affecting their performance in concrete. Cement is the most active component of concrete and usually has the greatest unit cost; therefore, its selection and proper use is imperative to attaining the desired balance of properties and cost for a particular concrete mixture. Selection should include consideration of the cement properties in relation to the required performance of the concrete. It includes a discussion of cement types, a brief review of cement chemistry, the influences of chemical admixtures and supplementary cementitious materials, as well as the effects of the environment on cement performance and reviews of the sustainability aspects for the use and manufacture of portland cement. Cement storage, delivery, sampling, and testing of hydraulic cements for conformance to specifications are addressed. Users will learn to recognize when a readily available, general-purpose cement will perform satisfactorily or when conditions require selection of a cement that meets additional requirements.