掺合料和砂率对混凝土早期开裂性能的影响研究

Influence of Admixture and Sand Ratio on Early Cracking Performance of Concrete

文中采用平板法试验研究了不同砂率和不同掺和料掺量下混凝土的早期开裂性能。试验结果表明,在其他因素不变的情况下,存在适宜的砂率使得混凝土抗开裂性能达到最佳。矿粉和粉煤灰等外掺料具有减少混凝土早期裂缝发生的作用,且两种外掺料复掺可产生正协同的效应。

The early cracking properties of concrete with different sand ratios and different admixture contents were studied by the flat plate method. The test results showed that under the condition that other factors remain unchanged, the existence of suitable sand ratio can make the crack resistance of concrete reach the best. The external admixtures such as mineral powder and fly ash had the effect of reducing the occurrence of early cracks in concrete, and the compounding of the two external admixtures could produce a positive synergistic effect.