拌和后短时内的二次加水对混凝土性能的影响

Influence of secondary water addition in short time after mixing on compressive strength of concrete

基于骨料、胶凝材料和外加剂不变的情况下,通过短时内二次定量加水,成型了不同二次加水量的混凝土试块,探讨了不同二次加水量对湿拌混凝土容重、硬化混凝土密度和抗压强度的影响。试验得出:短时内的二次加水对湿拌混凝土容重、硬化混凝土密度和抗压强度的影响趋势基本一致,均随二次加水量的增大而减小,但二次加水量与抗压强度间仅为局部线性相关,二次加水40%时,硬化混凝土的抗压强度降低可达50%。

Based on the fact that the aggregate,cementitious material and admixture are unchanged,the concrete test block with differ ent secondary water addition amount is formed by adding water in a short time,the effects of different secondary water addition on the bulk density of the wet mixed concrete,the density and compressive strength of the hardened concrete were discussed.The experiment shows that the influence of secondary water addition in short time on the bulk density of the wet mixed concrete,the density of the hard ened concrete and the compressive strength is basically the same,and both decrease with the increase of the secondary water addition,but the secondary water addition and resistance The compressive strength is only a local linear correlation.When the secondary water is added by 40%,the compressive strength of the hardened concrete is reduced by 50%.