Effects of Adding Sewage Sludge Ash on the Strength of Ordinary Portland Cement Concrete and Recycled Aggregate Concrete

被引：0

作者：

Shi X. ^{[1
]}

Zhang K. ^{[1
]}

Luan C. ^{[1
]}

Dai J. ^{[1
]}

Yang F. ^{[1
]}

机构：

[1] Key Lab. of Deep Underground Sci. and Eng., Ministry of Education, College of Architecture and Environment, Sichuan Univ., Chengdu

来源：

Gongcheng Kexue Yu Jishu/Advanced Engineering Sciences | 2021年 / 53卷 / 02期

关键词：

Compressive strength; Microstructure; Recycled aggregate concrete; Sewage sludge ash; Splitting strength;

D O I：

10.15961/j.jsuese.202000557

中图分类号：

学科分类号：

摘要：

In order to realize the resource utilization of the sewage sludge ash (SSA) in the concrete, the effects of adding the 0, 1%, 3% and 5% SSA on the workability, compressive strength and splitting strength of the ordinary Portland cement concrete (OPC) and recycled aggregate concrete (RAC) were studied. The results showed that adding SSA and using recycled coarse aggregate would reduce the workability of concrete. The more SSA added, the greater the degree of slump declined. When the dosage of SSA was 1%, 3% and 5%, the slump of ordinary concrete decreased by 20%, 24% and 28%, respectively, and that of recycled concrete decreased by 0, 25% and 67%, respectively. The compressive strength and splitting tensile strength of concrete mixed with SSA increase with age. The addition of 3% SSA promoted the compressive strength of OPC, and the compressive strengths at 7 d, 14 d and 28 d increased by 14.12%, 12.97% and 9.09%, respectively. The addition of 1% and 5% SSA had an adverse effect on the compressive strength of OPC. The addition of SSA increased the 7 d compressive strength of RAC, but it did not increase the 28d compressive strength of RAC significantly. Compared with the concrete without SSA, the average 7 d splitting strength of the OPC and the RAC with SSA decreased by 19.17% and 15.53% on average. Compared with the control group, the 28 d splitting strength of OPC with 1% and 3% SSA increased by 2.27% and 3.19%, respectively, while the RAC with 3% SSA increased by 18.72%. It can be seen that SSA with an amount of 3% could improve the compressive strength and splitting strength of OPC and RAC, which was a better amount. Different amounts of SSA had significantly improved the 0~7 d compressive strength of RAC. The microstructure analysis showed that the utilization of SSA in the RAC improved the utilization rate of SSA, which made the early strength of RAC with SSA increase obviously. When the amount of SSA was large, the excess SSA reduced the uniformity of concrete and affected strength development, resulting in no significant increase in compressive strength at 28d. Copyright ©2021 Advanced Engineering Sciences. All rights reserved.

引用

页码：103 / 109

页数：6

共 24 条

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