Methods for determining hydration kinetics by chemical shrinkage and parameters influencing it

Abstract Measuring chemical shrinkage provides information about the development of hydration kinetics of cementitious materials. It is also related to the degree and heat of hydration. To determine chemical shrinkage, volume change caused by the hydration reactions in a sample of cement paste under saturation conditions is quantified. There are three methods to measure this shrinkage: dilatometry, gravimetry and picnometry. These experimental procedures require simple and inexpensive equipment. There are parameters that can influence the results, such as sample thickness, water/cement ratio, surface area of the sample, amount of water on the sample and cement composition. In this research, the methods for measuring chemical shrinkage in Portland cement pastes are detailed, as well as the parameters that influence the results.

摘要：测量化学收缩可获取胶凝材料水化动力学的发展信息，其与水化程度及水化热亦存在关联。为测定化学收缩，需量化饱和条件下水泥浆试样因水化反应产生的体积变化。目前用于测量该收缩的方法主要有三种：膨胀法（dilatometry）、重量法（gravimetry）与比重瓶法（picnometry）。这些实验操作所需设备简易且成本低廉。诸多参数会对测试结果造成影响，例如试样厚度、水灰比（water/cement ratio）、试样表面积、试样表面含水量以及水泥组成。本研究详细阐述了硅酸盐水泥浆体化学收缩的测量方法，以及影响测试结果的各类参数。