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投稿时间：2020-07-07 修订日期：2020-09-19
投稿时间：2020-07-07 修订日期：2020-09-19
中文摘要: 为实现污泥在混凝土中的资源化利用，试验研究了掺加质量分数为0、1%、3%和5%的污泥灰作为补充凝胶材料对普通混凝土和再生混凝土的坍落度、抗压强度和劈裂抗拉强度的影响规律。研究结果表明：坍落度随污泥灰掺量的增加而下降，当污泥灰掺量为1%、3%和5%时，普通混凝土坍落度分别下降20%、24%和28%，再生混凝土坍落度分别下降0、25%和67%。掺加污泥灰的混凝土，其抗压强度和劈裂抗拉强度随龄期增加而提高。掺加3%污泥灰对普通混凝土抗压强度起到促进作用，其7、14和28 d的抗压强度分别提高14.12%、12.97%和9.09%。掺加1%和5%的污泥灰对普通混凝土抗压强度起到不利作用。掺加污泥灰提高了再生混凝土的7 d抗压强度，但28 d抗压强度没有明显增长。与对照组相比，掺加污泥灰的普通混凝土和再生混凝土的7 d抗拉强度平均下降19.17%和15.53%。相比对照组，掺加3%污泥灰的普通混凝土28 d抗拉强度提高3.19%，掺加3%污泥灰的再生混凝土提高了18.72%。可见，掺量为3%的污泥灰能提高普通混凝土和再生混凝土的抗压强度和抗拉强度，是较优掺量。微观结构分析表明，再生混凝土中由于旧砂浆的存在提高了污泥灰的利用率，使得污泥灰再生混凝土的早期强度增长明显，当污泥灰掺量较大时，多余的污泥灰降低了混凝土的均匀性从而影响强度发展导致28 d抗压强度没有明显增长。
Abstract: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.
keywords: recycled aggregate concrete sewage sludge ash compressive strength splitting strength microstructure
文章编号：202000557 中图分类号：TU501 文献标志码：
基金项目:四川省科学技术厅应用基础研究项目（2020YJ0319）
作者简介:第一作者：石宵爽(1984-),女,副教授,博士.研究方向:新型混凝土材料;再生资源化利用.E-mail:shixs@scu.edu.cn
引用文本：
石宵爽,张宽裕,栾晨晨,代金芯,杨富花.掺加污泥灰对普通混凝土和再生混凝土力学性能的影响[J].工程科学与技术,2021,53(2):103-109.
SHI Xiaoshuang,ZHANG Kuanyu,LUAN Chenchen,DAI Jinxin,YANG Fuhua.Effects of Adding Sewage Sludge Ash on the Strength of Ordinary Portland Cement Concrete and Recycled Aggregate Concrete[J].Advanced Engineering Sciences,2021,53(2):103-109.
引用文本：
石宵爽,张宽裕,栾晨晨,代金芯,杨富花.掺加污泥灰对普通混凝土和再生混凝土力学性能的影响[J].工程科学与技术,2021,53(2):103-109.
SHI Xiaoshuang,ZHANG Kuanyu,LUAN Chenchen,DAI Jinxin,YANG Fuhua.Effects of Adding Sewage Sludge Ash on the Strength of Ordinary Portland Cement Concrete and Recycled Aggregate Concrete[J].Advanced Engineering Sciences,2021,53(2):103-109.