流态固化土用无熟料胶凝材料的性能研究

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (10): 3548-3555.

流态固化土用无熟料胶凝材料的性能研究

周永祥^1,2, 刘倩^2,3, 王祖琦², 郝彤³, 冷发光²

1.北京工业大学城市建设学部,北京 100124;
2.中国建筑科学研究院有限公司,北京 100013;
3.郑州大学土木工程学院,郑州 450000

收稿日期:2022-03-15 修回日期:2022-06-17 出版日期:2022-10-15 发布日期:2022-10-26
作者简介:周永祥(1979—),男,博士,研究员。主要从事固废利用、混凝土和岩土固化研究。E-mail:xiangzizhou2006@126.com
基金资助:
国家重点研发计划(2018YFD1101002)

Properties of Cementitious Materials Without Clinker for Fluid Solidified Soil

ZHOU Yongxiang^1,2, LIU Qian^2,3, WANG Zuqi², HAO Tong³, LENG Faguang²

1. Faculty of Architecture, Civil and Transportation Engineering, Beijing University of Technology, Beijing 100124, China;
2. China Academy of Building Research, Beijing 100013, China;
3. School of Civil Engineering, Zhengzhou University, Zhengzhou 450000, China

Received:2022-03-15 Revised:2022-06-17 Online:2022-10-15 Published:2022-10-26

摘要/Abstract

摘要： 流态固化土是近年来为提高市政、建筑工程狭窄空间回填质量而发展的一种新材料。本文采用钢渣粉、CFB脱硫灰、稻壳灰等多种低品质固废作为无熟料胶凝材料制备流态固化土,并对流态固化土的无侧限抗压强度、干燥收缩性能、重金属浸出性能、微观结构等开展相关试验。研究表明:采用无熟料胶凝材料制备的流态固化土,其拌合物流动扩展度和无侧限抗压强度可满足一般填筑工程的要求,硬化体的干燥收缩值明显低于同掺量的水泥固化土,且无重金属浸出毒性超标的风险;在多种固废协同作用下,土颗粒聚集成团,孔隙明显减小,絮状的凝胶与针棒状的钙矾石晶体相互交织,附着在土颗粒表面,联结土颗粒,使得固化土的强度显著提高。

关键词: 流态固化土, 固体废弃物, 无侧限抗压强度, 微观结构, 干燥收缩, 重金属浸出

Abstract: Fluid solidified soil is a new material developed in recent years to improve backfill quality of narrow space in municipal and construction engineering. In this paper, steel slag powder, CFB desulfurization ash, rice husk ash and other low-quality solid wastes were used as clinker-free cementitious materials to prepare fluid solidified soil, and the unconfined compressive strength, drying shrinkage property, heavy metal leaching property and microstructure of fluid solidified soil were tested. The research shows that theflow expansion degree and unconfined compressive strength of fluid solidified soil prepared by cementitious materials without clinker meet the requirements of general filling engineering, the drying shrinkage value of hardened body is significantly lower than that of cement solidified soil with the same content, and there is no risk of excessive leaching toxicity of heavy metals. Under the synergistic effect of various solid wastes, the soil particles aggregate into clusters, and the pores are significantly reduced. The flocculent gel and acicular ettringite crystal are intertwined, adhere to the surface of soil particles and connect to soil particles, which enhance the strength of solidified soil.

Key words: fluid solidified soil, solid waste, unconfined compressive strength, microstructure, drying shrinkage, heavy metal leaching

中图分类号:

TU472

周永祥, 刘倩, 王祖琦, 郝彤, 冷发光. 流态固化土用无熟料胶凝材料的性能研究[J]. 硅酸盐通报, 2022, 41(10): 3548-3555.

ZHOU Yongxiang, LIU Qian, WANG Zuqi, HAO Tong, LENG Faguang. Properties of Cementitious Materials Without Clinker for Fluid Solidified Soil[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(10): 3548-3555.

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