预湿重金属污泥烧结陶砂对超高强混凝土性能的影响

摘要/Abstract

摘要： 为解决超高强混凝土体积稳定性问题和实现重金属污泥高值化利用,本文采用重金属污泥烧结陶砂取代部分河砂制备超高强混凝土,研究不同掺量和颗粒级配陶砂对超高强混凝土工作性能、力学性能及收缩性能的影响,并采用XRD、TG-DTG、FTIR和SEM微观测试方法深入分析陶砂对超高强混凝土物相组成、微观形貌及孔隙结构的影响。结果表明:预湿重金属污泥烧结陶砂对超高强混凝土早期有显著的内养护效果,养护龄期为14 d时,与基准组相比,陶砂颗粒级配为中砂的超高强混凝土自收缩降低了11.0%~27.6%,陶砂掺量为20%(质量分数)时,抗折强度增加了13.5%;掺入陶砂可以加快超高强混凝土的早期水化反应,生成较多的水化产物,增加结构的致密性,但预湿重金属污泥烧结陶砂会对超高强混凝土强度产生不利影响,应对其掺量和颗粒级配加以控制。

关键词: 超高强混凝土, 重金属污泥, 陶砂, 内养护, 自收缩, 微观特征

Abstract: In order to solve the problem of volume stability failure of ultra-high strength concrete and realize high value utilization of heavy metal sludge, this paper proposed to use heavy metal sludge sintered pottery sand to replace part of river sand to prepare ultra-high strength concrete. The effects of different content and particle grade of pottery sand on the working performance, mechanical properties and shrinkage properties of ultra-high strength concrete were studied. The effect of pottery sand on the phase composition, microstructure and pore structure of ultra-high strength concrete were studied by XRD, TG-DTG, FTIR and SEM microscopic test methods. The results show that the pre-wetting heavy metal sludge sintered pottery sand has significant internal curing effect on the early stage of ultra-high strength concrete.When the curing age is 14 d, compared with the reference group, the autogenous shrinkage of ultra-high strength concrete with medium sand is reduced by 11.0%~27.6% ,and the flexural strength is increased by 13.5% when the content of pottery sand is 20% (mass fraction). The incorporation of pottery sand can accelerate the early hydration reaction of ultra-high strength concrete, generate more hydration products, and increase the compactness of structure. However, the pre-wetting heavy metal sludge sintered pottery sand will adversely affect the strength of ultra-high strength concrete, and its content and particle grade should be controlled.

Key words: ultra-high strength concrete, heavy metal sludge, pottery sand, internal curing, autogenous shrinkage, microscopic characteristic

中图分类号:

TU528.582

王胜, 马红瑞, 纪璐鑫, 马哲洋, 崔嘉铭, 巴明芳, 邵念萍. 预湿重金属污泥烧结陶砂对超高强混凝土性能的影响[J]. 硅酸盐通报, 2024, 43(12): 4442-4451.

WANG Sheng, MA Hongrui, JI Luxin, MA Zheyang, CUI Jiaming, BA Mingfang, SHAO Nianping. Effect of Pre-Wetting Heavy Metal Sludge Sintered Pottery Sand on Performance of Ultra-High Strength Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(12): 4442-4451.

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