养护对高性能混凝土塑性收缩的影响

Effect of curing on plastic shrinkage of high performance concrete

在 4种不同养护条件下 ,对掺有养护剂 SAP、硅灰和粉煤灰的高性能混凝土进行对比试验 ,采用混凝土板试验研究高性能混凝土早期塑性收缩和裂缝。研究结果表明 ,养护条件对高性能混凝土的塑性收缩和裂缝有显著的影响 ,硅灰和粉煤灰等矿物材料能减少塑性收缩并能优化混凝土的性能 。

In order to investigate the early-age plastic shrinkage and cracking of high performance concrete,the contrastive experiments under four different curing conditions were made by means of concrete slab testing on the concrete samples into which the self-curing superabsorbent polymer(SAP),silica fume and fly ash were added. The experimental results show that the curing environment has obvious effect on plastic shrinkage and cracking of high performance concrete,and that mineral admixtures such as silica fume and fly ash can reduce plastic shrinkage and optimize the performance of concrete. It is also found that self-curing concrete demonstrates good performance in controlling plastic shrinkage and cracking.