Systematization of hydration and resultant physical properties of hardened cement paste from a thermodynamic approach

本文从热力学的角度对水泥水化体系、硬化水泥的硬化过程以及体积变化现象如杨氏模量、泊松‘=S比、干缩、热膨胀系数、徐变等进行了研究。为此，试验采集了水泥中各矿物的水化程度、不同水灰比、不同养护条件下水泥浆体的物相组成，同时测定了抗压强度、杨氏模量、泊松比、吸湿等温线、热膨胀系数、自收缩、干燥收缩、拉伸蠕变和热传导。对于速率问题，在上述实验数据的基础上提出了硅酸盐水泥的水化速率模型，并提出了相组成模型。此外，从水泥硬化浆体的物相组成来评价水泥硬化浆体的物理性能，开发了基于水泥水化的寿命模拟系统。在未来的研究中，讨论了骨料和水泥浆体之间的相互作用，并对混凝土工程问题进行了建模。

In this research, cement hydration system, hardening process of hardened cement, and volume change phenomenon such as Young's modulus, Poisson' =s ratio, drying shrinkage thermal expansion coefficient, creep, are evaluated from a thermodynamic approach. For this purpose, degree of hydration of each minerals in cement, phase composition of cement paste with different cement, w/c ratio, and curing condition are collected experimentally and at the same time, compressive strength, Young's modulus, Poisson's ratio, vapor sorption isotherm, thermal expansion coefficient, autogenous shrinkage, drying shrinkage, tensile creep, and heat conduction are measured. As the rate problem, rate of hydration model for Portland cement is proposed based on the above mentioned experimental data, and phase composition model is also proposed. In addition, physical properties of hardened cement paste is evaluated from phase composition of hardened cement paste, life span simulation system based on cement hydration is developed. In future study, interaction between aggregate and cement paste is discussed and modeled for concrete engineering problem.