超细矿渣粉对硅酸盐水泥性能和微观结构的影响

发布时间：2018-02-16 05:57

本文关键词： 超细矿渣粉标准稠度用水量凝结时间强度　出处：《材料导报》2017年S1期 　论文类型：期刊论文

【摘要】：通过掺入不同量的超细矿渣粉,研究其对普通硅酸盐水泥凝结时间、标准稠度用水量以及水泥胶砂流动性和强度的影响。结果表明,水泥浆体的初凝、终凝时间在矿渣粉掺量为5%(质量分数,下同)时有所缩短,而随着超细矿渣粉掺量的增加,初凝时间都有所延长,在掺量为20%时初凝时间最长。然而终凝时间的变化不大,只有掺量为30%时稍有延长;水泥的标准稠度用水量先减少后增加,在掺量为20%时最小;随着超细矿渣粉掺量的增大,水泥胶砂的各龄期抗折强度、3d抗压强度不断提高,7d、28d抗压强度在掺量为20%时达到最大值,之后有所降低。掺入超细矿渣粉后,能通过填充以及与水泥水化产物氢氧化钙发生反应,使水泥中氢氧化钙含量明显降低,水泥微观结构更加密实。
[Abstract]:The effects of different amount of superfine slag powder on setting time of Portland cement, water consumption of standard consistency and fluidity and strength of cement mortar were studied. The final setting time is shortened when the amount of slag powder is 5 (mass fraction, the same below), but with the increase of superfine slag powder content, the initial setting time is prolonged, and the initial setting time is the longest when the amount of slag powder is 20. However, the final setting time does not change much. The standard consistency water consumption of cement decreases first and then increases, and the minimum amount is 20. With the increase of superfine slag powder content, The compressive strength of cement sand at different ages is increased continuously for 3 days. The compressive strength of cement sand reaches its maximum value at the dosage of 20 and then decreases. After adding ultrafine slag powder, it can be filled and reacted with calcium hydroxide, the hydration product of cement. The content of calcium hydroxide in cement is obviously reduced and the microstructure of cement is more dense.
【作者单位】：江苏中铁奥莱特新材料股份有限公司;
【分类号】：TQ172.1

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