模拟大体积混凝土条件下生成的钙矾石的形态

Microstructure of Ettringite Formed under the Simulated Condition of the Core of Massive Concrete

利用半定量XRD和SEM EDS分析、观察了补偿收缩水泥砂浆在模拟大体积混凝土内部温湿度条件下的水化产物相组成和微观形貌 .延迟钙矾石生成所导致的试件开裂是由于微晶状钙矾石在硬化砂浆中均匀膨胀所致 .

The phase composition and micro-morphologies of hydration products of shrinkage-compensating mortar were investigated under the simulated condition of the core of massive concrete using semi-quantitative XRD and SEM-EDS. The cracking of mortars induced by delayed ettringite formation is due to the uniform expansion of microcrystalline ettringite in the hardened mortars.