Development of shrinkage cracking assessment system of concrete containing mineral admixture

开展了利用高炉矿渣、粉煤灰等工业废渣评价混凝土收缩裂缝的综合试验研究。试验结果表明，水泥取代矿物掺合料后，其高温养护后的抗收缩开裂性能可能会因抗拉徐变和抗拉强度的降低而降低，而高温下促进化学反应而形成的致密孔结构可以缓解收缩。考虑掺矿物掺合料混凝土的温度历史效应对混凝土收缩裂缝的预测具有重要意义。

The comprehensive experimental study for the assessment of the shrinkage cracking of concrete with industrial waste such as blast furnace slag and fly ash is carried out. The experimental results suggest that the shrinkage cracking resistance after curing at elevated temperature is likely to be decreased due to reductions of tensile creep and tensile strength when the mineral admixture is replaced with cement, while the dense pore structure arising from the promoted chemical reaction under high temperature can mitigate the shrinkage. It is significant to take into account the effect of temperature history of concrete with mineral admixture to predict the shrinkage cracking.