不同复合掺合料对胶砂脆性的影响

Effect of different compound admixtures on brittleness of cement mortar

采用粉煤灰(Ⅰ级、Ⅱ级)、矿渣粉(S105级、S95级)、硅灰、石灰石粉(超细、普通)、钢渣粉(二级)、天然火山灰复配成多种复合掺合料,分别测试了掺加30%、50%复合掺合料水泥胶砂的7、28、56、90 d抗压和抗折强度,分析不同复合掺合料对胶砂脆性的影响差异。结果表明:复合掺合料3F1Sl1Si、3F1L1、3F1L2、3F2L2、5F1L1、3F1Sl1lL1、5F1Sl1lL1的胶砂抗压强度在达到或接近纯水泥体系的情况下,脆性系数也低于纯水泥体系。

Using fly ash(gradeⅠandⅡ),slag powder(grade S105 and S95),silica fume,limestone powder(superfine and ordinary),steel slag powder(gradeⅡ)and natural pozzolanic ash to synthesize a variety of composite admixtures,this paper studied the compressive strength and flexural strength of cement mortar with 30%and 50%composite admixtures respectively in 7 d,28 d,56 d and 90 d,and analyzed the influence of different composite admixtures on the brittleness of mortar.The results show that the compressive strength of the composite sand 3 F1 Sl1 Si,3 F1 L1,3 F1 L2,3 F2 L2,5 F1 L1,3 F1 Sl1 lL1,5 F1 Sl1 lL1 is in or near to the pure cement,and the brittleness coefficient is also lower than that of the pure cement.