机制砂石粉对聚羧酸减水剂性能影响

研究了机制砂石粉的岩性、含量、细度对减水剂饱和产量、保坍性能和引气性能的影响.试验结果表明,玄武岩的饱和点掺量最高,砂浆流动度损失较大,保气性能较差,对胶砂和混凝土工作性能影响最大;机制砂中石粉含量的增加,减水剂的饱和点增大,减水剂敏感性增强,保坍性能下降,石粉含量过低或者过高都会影响减水剂的引气性能;随着石粉细度增加...

The influence of machine-made sand and gravel powder on the performance of polycarboxylate water-reducing agent

The influence of the lithology,content and fineness of machine-made sand and gravel powder on the saturated yield,slump retention performance and air-entraining performance of water-reducing agent is studied. The test results show that the saturation point of basalt is the highest,the fluidity loss of the mortar is greater,the gas retention performance is poor,and it has the greatest impact on the workability of mortar and concrete;the increase in the content of stone powder in the machine-made sand increases the saturation point of the water reducing agent. The sensitivity of the water-reducing agent is enhanced,and the slump retention performance is reduced. Too low or too high stone powder content will affect the air-entraining performance of the water-reducing agent;as the fineness of the stone powder increases,the saturated content of the water-reducing agent first decreases and then increases,The air-entraining performance first increases and then decreases,and the air-retaining performance gradually becomes better. When the fineness is less than or equal to 700 mesh,the water-reducing agent slump retention performance changes little,the fineness continues to increase,and the slump retention performance decreases.