摘要
从热传导的基本原理出发,分析了混凝土的边值条件以及大体积混凝土浇筑后的温度变化情况,根据混凝土中水泥水化情况,将浇筑后的混凝土划分了水化热发生的阶段;无热源期,混凝土温度随内部热量逐渐散发而降低;水泥水化热产生的初温消失三个阶段。进一步根据边值条件,计算了大体积混凝土在三个阶段的温度变化,水泥的熟料组成、掺合料、混凝土的龄期会影响大体积混凝土温度变化,尽量降低内部热源散热量是控制混凝土裂缝的关键。
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.
出处
《建筑技术》
2013年第5期402-405,共4页
Architecture Technology
关键词
热传导
水化热
边值条件
温度计算
heat conduction
hydration heat
boundary value condition
temperature calculation
