Abstract：
According to the basic principles of heat conduction, this paper analyzes the boundary value conditions of concrete and temperature variation of massive concrete after pouring. Based on cement hydration in concrete, concrete pouring is divided into three phases, among which hydration heat is generated in the first phase, the second phase is a period without heat source where concrete temperature drops when the internal heat is emitted, and the third phase is the period where the initial temperature generated by cement hydration heat has disappeared. In addition, temperature variation of massive concrete is calculated respectively within the three phases according to the boundary value conditions. It is found that cement clinker ingredients, aggregates and concrete age may affect temperature variation of massive concrete, so the key point for concrete crack control is to reduce emission of internal heat source as much as possible.
