Effect of Polycarboxylate Water Reducing Agent on Performance of Modified Adobe

被引：0
|
作者：
Qian J. [1 ]
Yin D. [1 ]
Yu D. [1 ]
Fan Y. [1 ]
Huang Y. [1 ]
机构：
[1] College of Materials Science and Engineering, Chongqing University, Chongqing
来源：
Jianzhu Cailiao Xuebao/Journal of Building Materials | 2019年 / 22卷 / 03期
关键词：
Adobe; Polycarboxylate water reducing agent; Volume stability; Water resistance;
D O I：
10.3969/j.issn.1007-9629.2019.03.008
中图分类号：
学科分类号：
摘要：
Polycarboxylate water reducing agent was added to the gypsum fly ash modified adobe, and its effect on working performances, mechanical properties, water resistance and volume stability of modified adobe were experimentally studied. It can be found that the polycarboxylate water reducing agent can significantly improve the fluidity of the modified adobe slurry. When the content of water reducing agent is 0.80%, the slurry can be poured forming under the water-solid ratio which is lower than the liquid limit of the adobe; within a certain range, the compressive strength and flexural strength of modified adobe increase with the polycarboxylate water reducing agent content. When mix proportion of modified adobe is 15% gypsum, 5% fly ash, 1% calcium oxide, by adding 0.80% polycarboxylate water reducing agent, the 28d compressive strength of modified adobe can reach 8.30MPa, and the flexural strength can reach 2.98MPa. Compared to the modified adobe without water reducing agent, the compressive strength and the flexural strength are increased by 4.5 times and 2.1 times respectively. The water resistance index is used to evaluate the water resistance of the modified adobe. It can be found that the polycarboxylate water reducing agent can significantly improve the water resistance and reduce the shrinkage rate of the modified adobe. When the content of water reducing agent is 0.80%, the shrinkage rate can be as low as 0.06%. SEM and XRD results show that the polycarboxylate water reducing agent can make the internal structure of modified adobe more compact, and it has little effect on the hydration products of the modified adobe. © 2019, Editorial Department of Journal of Building Materials. All right reserved.
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页码：378 / 384and400
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