基于水泥水化的早龄期混凝土温湿耦合

Coupling of hygro-thermal field in early-age concrete based on cement hydration

为了分析早龄期混凝土温湿度场耦合效应,基于Krstulovi-Dabi水化反应动力学方程式建立掺粉煤灰的水泥水化微观结构模型;考虑混凝土硬化过程中的水化放热及水分消耗作用,以及孔隙率对湿度扩散系数的影响,构建早龄期混凝土温湿度耦合作用模型,并通过已有试验数据对模型进行验证.研究表明基于水泥水化微观信息的混凝土温湿度场耦合作用模型可以较好地预测早龄期混凝土内部的温湿度场时变发展规律,研究成果可为早龄期混凝土变形及开裂的研究提供理论支持.

In order to analyze the coupling effect of temperature and humidity fields in early-age concrete,a microstructure model of cement hydration incorporating fly ash based on Krstulovi-Dabi hydration kinetics formulas was proposed.In considering the hydration heat release and water consumption during the hardening process,as well as the influence of porosity on moisture diffusion coefficient,a coupled hygrothermal model of early-age concrete was established,and verified through an experiment.The research results indicates that the coupled hygro-thermal model constructed based on the micro-structure information of cement hydration can accurately predict the time-dependent development of temperature and humidity field inside the early-age concrete.The research can theoretically support the investigation on the deformation and cracking of the early-age concrete.