机制砂MB值对掺石粉混凝土性能的影响

Effect of the MB value of manufactured sand on properties of concrete with stone powder

研究了不同机制砂MB值(0.75、2.75)对掺石粉混凝土的工作性、力学性能的影响。结果表明:机制砂MB值的增加会降低混凝土的工作性;当机制砂MB值较小时,适当的石粉掺量可以在一定程度上改善混凝土的工作性,但机制砂MB值过大对混凝土工作性的负面影响远大于石粉的正面影响;对于纯水泥或单掺粉煤灰组试件,机制砂MB值的增加会降低其抗压强度;而对于掺石粉的试件,机制砂MB值的增加会小幅提高其抗压强度;总体上,机制砂MB值对掺石粉混凝土抗压强度的影响相对较小。

The influence of different MB values of manufactured sand(0.75,2.75)on the workability and mechanical properties of concrete with stone powder was studied.The results indicate that an increase in the MB value of manufactured sand will reduce the workability of concrete.When the MB value of manufactured sand is small,an appropriate content of stone powder can improve the workability of concrete to a certain extent,but the negative impact of excessive MB value of manufactured sand on the workability of concrete is much greater than the positive impact of stone powder.For pure cement or single fly ash specimens,an increase in the MB value of the manufactured sand will reduce the compressive strength.For specimens mixed with stone powder,an increase in the MB value of manufactured sand will slightly increase the compressive strength.Overall,the influence of MB value of manufactured sand on the compressive strength of concrete with stone powder is relatively small.