粉煤灰、减水剂对水泥浆体相容性影响的试验研究

发布时间：2018-01-01 11:25

本文关键词：粉煤灰、减水剂对水泥浆体相容性影响的试验研究　出处：《河北建筑工程学院学报》2016年03期 　论文类型：期刊论文

【摘要】：通过调整萘系和聚羧酸系减水剂的含量,观察水泥浆体的流动性和流动性经时损失的变化,由此确定减水剂的饱和点和减水剂对水泥相容性影响;减水剂在饱和点掺量时,调整粉煤灰掺量,研究粉煤灰掺量对水泥相容性的影响.结果表明:水泥浆体的流动度随减水剂掺量的增加而增大;萘系减水剂的饱和点掺量为0.8%,聚羧酸系减水剂的饱和点掺量为1.4%;在减水剂饱和点附近,静置35 min、60 min,萘系、聚系减水剂流动度经时损失分别为65%和39%,且聚羧酸系减水剂具有滞后性;聚系减水剂与水泥的相容性优于萘系高效减水剂;在减水剂饱和点掺量处,随着粉煤灰含量的增加,水泥浆体的流动度增大.
[Abstract]:By adjusting the content of naphthalene and polycarboxylic acid series water reducer, the fluidity and fluidity loss of cement paste were observed, and the saturation point of water reducing agent and the effect of water reducing agent on the compatibility of cement were determined. The effect of fly ash content on the compatibility of cement is studied by adjusting the content of fly ash at saturation point. The results show that the fluidity of cement paste increases with the increase of water reducing agent content. The saturation point of naphthalene superplasticizer is 0.8 and that of polycarboxylic acid superplasticizer is 1.4. Near the saturation point of the superplasticizer, the flowing loss of naphthalene and polyvinyl superplasticizer were 65% and 39 respectively at 35 min or 60 min, and the polycarboxylate superplasticizer had hysteresis. The compatibility of polymer superplasticizer and cement is better than that of naphthalene superplasticizer. At the saturation point of superplasticizer, the fluidity of cement paste increases with the increase of fly ash content.
【作者单位】：河北建筑工程学院;四川能投电力开发有限公司;
【基金】：2015年张家口市科技局项目(I421010B)
【分类号】：TU528
【正文快照】： 0引言混凝土作为建筑材料应用越来越广泛,混凝土的各种性能对混凝土的广泛使用影响较大,特别是减水剂、矿物掺合料和水泥的相容性影响较大.减水剂可以明显改善混凝土拌合物的可泵性,提高混凝土的耐久性能和物理力学性能,节约水泥,改善施工条件,提高施工效率,故其在预拌混凝土

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