摘要
针对石灰石粉在掺合料混凝土中的应用所产生的外加剂与胶凝体系的适应性问题，采用饱和点和流动度的方法比较了减水利与不同复合胶凝材料（石灰石粉-粉煤灰、石灰石粉-矿渣、石灰石粉-硅灰）的适应性影响规律。试验结果表明：不同复合胶凝材料组成的适应性存在显著差异，石灰石粉的掺入能够降低聚羧酸高效减水剂的饱和点；粉煤灰和矿渣的掺入对改善聚羧酸高效减水剂与石灰石粉-水泥胶凝体系的适应性有利；硅灰的掺入使得聚羧酸高效减水剂与石灰石粉-水泥胶凝体系的适应性变差；石灰石粉-粉煤灰的掺入，混凝土的早期强度降低，但是混凝土的后期强度得到提高。
Aiming at the compatibility of water-reducer and cementitious system in admixture concrete after mixing limestone powder, comparing the compatibility of water-reducer and different cementitious system（ limestone powder-fly ash, limestone powder-slag, limestone powder-silica fume） through saturation point and fluidity. Result shows that remarkable difference existing between the compatibility of water-reducer and different cementitious system, mixing limestone powder can reduce the saturation point of polycarboxylic series super plasticizer; mixing fly ash and slag will improve the compatibility of polycarboxylic series super plasticizer and cementitious system mixing limestone powder; mixing silica fume will reduce the compatibility of polycarboxylic series super plasticizer and cementitious system mixing limestone powder; mixing limestone powder and fly ash will reducethe early strength of concrete, but the late strength of concrete is improved.
关键词
石灰石粉
减水剂
饱和点
流动度
limestone powder
water-reducer
saturation point
fluidity
