憎水剂对超轻发泡混凝土性能的影响研究-《混凝土与水泥制品》杂志社

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憎水剂对超轻发泡混凝土性能的影响研究

Affecting Research of Water Repellent on Properties of Ultra-lightweight Foamed Concrete

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关键词：

超轻发泡混凝土；憎水剂；孔结构；抗压强度; 体积吸水率

Key words：

Ultra-lightweight foamed concrete; Water repellent; Pore structure; Compressive strength; Volume water absorption

刊期：

２０16年第3期

DOI：

文章编号：

1000-4637（2016）03-71-04

基金项目：

作者：

何顺爱1，朱晓燕2

单位：

1.四川华西绿舍建材有限公司，成都 610081；2.西南科技大学，绵阳 620024

摘要

摘要：以普通硅酸盐水泥与硫铝酸盐水泥为胶凝材料，采用物理发泡工艺制备了干密度小于300kg/m³的发泡混凝土，研究了三种憎水剂对发泡混凝土抗压强度、体积吸水率及孔结构的影响。研究表明：憎水剂掺量增加，试样7d及28d抗压强度先增加后降低，憎水剂硬脂酸钙相对于苯丙乳液及有机硅，对试样干密度及气孔结构影响最小，体积吸水率降低最为明显；当硬脂酸钙掺量为2.5%时，干密度为274.1kg/m³的试样28d抗压强度为0.65MPa，体积吸水率为8.6%。

Abstract: For ordinary Portland cement and sulphoaluminate cement as cementitious materials, foamed concrete for dry density less than 300kg/m³ is prepared by physical foaming process, the influence of three kinds of water repellents on compressive strength, volume water absorption and pore structure is investigated. The results indicate that, with the increasing dosage of water repellent, the compressive strength of samples with 7 days and 28 days is increased at first then decreased, compared with styrene-acrylate emulsion and organic silicon, the effect of calcium stearate on dry density and pore structure of samples is the least, and volume water absorption is decreased significantly. When the dosage of calcium stearate is 2.5%, the dry density of sample is 274.1kg/m³, the compressive strength in 28 days achieves 0.65MPa and the volume water absorption is 8.6%.

结论

（1）以硫铝酸盐水泥取代15%的普通硅酸盐水泥，并采用物理发泡工艺,可制备干密度275. 2kg/m³，28d抗压强度0.56MPa的超轻发泡混凝土。

（2）憎水剂从0增加至3.75%，超轻发泡混凝土7d及28d抗压强度先增加后降低，体积吸水率下降，但憎水剂硬脂酸钙相对于苯丙乳液和有机硅对超轻发泡混凝土气孔结构及干密度影响程度小，并且能够大幅度降低超轻发泡混凝土的体积吸水率。当硬脂酸钙掺量为2.5%，硫铝酸盐水泥取代15%的普通硅酸盐水泥可制备出干密度为274.1kg/m³， 28d抗压强度为0.65MPa，体积吸水率为8.6%的超轻发泡混凝土。

参考文献

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