矿渣-粉煤灰地聚物固化淤泥力学性能和路用性能研究

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (2): 693-703.

矿渣-粉煤灰地聚物固化淤泥力学性能和路用性能研究

杨振甲^1,2, 何猛³, 吴杨¹, 史钰鹏³, 孙亮¹, 潘竹^3,4, 张默^3,5

1.中国水电基础局有限公司,天津 301700;
2.天津市地基与基础工程企业重点实验室,天津 301700;
3.河北工业大学土木与交通学院,天津 300401;
4.智慧基础设施研究院,天津 300401;
5.天津市装配式建筑与智能建造重点实验室,天津 300401

收稿日期:2021-09-18 修回日期:2021-12-02 出版日期:2022-02-15 发布日期:2022-03-01
通讯作者: 张默,博士,副教授。E-mail:mozhang@hebut.edu.cn
作者简介:杨振甲(1984—),男。主要从事岩土材料的研究。E-mail:yangzhenjia-sdjc@powerchina.cn
基金资助:
河北省自然科学基金(E2019202431,E2019202484,20373803D)

Mechanical Properties and Road Performance of Slag-Fly Ash Geopolymer Stabilized Sludge

YANG Zhenjia^1,2, HE Meng³, WU Yang¹, SHI Yupeng³, SUN Liang¹, PAN Zhu^3,4, ZHANG Mo^3,5

1. Sinohydro Foundation Engineering Co., Ltd., Tianjin 301700, China;
2. Tianjin Key Laboratory of Ground and Foundation Engineering, Tianjin 301700, China;
3. School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China;
4. Smart Infrastructure Research Institute, Tianjin 300401, China;
5. Tianjin Key Laboratory of Prefabricated Building and Intelligent Construction, Tianjin 300401, China

Received:2021-09-18 Revised:2021-12-02 Online:2022-02-15 Published:2022-03-01

摘要/Abstract

摘要： 为实现河底淤泥的资源化处置,常采用水泥等胶凝材料固化淤泥提高承载力作为路基材料。传统固化材料能耗大、碳排放量高。为开发可持续性固化材料,本研究采用矿渣-粉煤灰二元地聚物固化淤泥,研究其力学性能及路用性能。通过研究Si/Al摩尔比、Na/Al摩尔比对地聚物凝结时间和抗压强度的影响规律,确定地聚物配合比设计。依据优化配合比固化淤泥,研究地聚物掺量、养护龄期对固化淤泥力学性能的影响,并对固化淤泥进行水稳性、加州承载比、干缩和温缩试验,以评估其路用性能;采用扫描电镜和X射线衍射等试验方法对固化淤泥进行微观分析,揭示其固化机制。试验结果表明,矿渣-粉煤灰基地聚物地质聚合产物为无定形地聚物凝胶、水化硅酸钙、水化铝酸钙等,增强了土颗粒之间的胶结并且填充了孔隙,提高了固化淤泥的力学性能和路用性能。研究结果为地聚物固化淤泥土工程应用提供了实验基础。

关键词: 固化淤泥, 矿渣-粉煤灰地聚物, 无侧限抗压强度, 水稳性, 干缩性, 温缩性, 固化机理, 路基材料

Abstract: River sludge is usually stabilized with cementitious binder and applied in pavement construction as sub-ground soil for sustainable treatment. However, the application of Ca-based binder, such as Portland cement and lime, is increasingly limited by the high energy consumption and CO₂ emission. To solve this problem, granulated blast furnace slag (GBFS) and fly ash were used to synthesize binary-phases based geopolymer to stabilize sludge. Firstly, the mix proportion of geopolymer stabilizer was determined based on the influence of Si/Al and Na/Al molar ratio on the setting time and compressive strength of geopolymer. Subsequently, the effects of geopolymer content and curing age on the mechanical properties of stabilized sludge are studied, and the practical performance of stabilized sludge was evaluated with water stability, CBR, dry shrinkage and temperature shrinkage tests. Furthermore, the stabilization mechanism was revealed by the microstructure characterization with scanning electron microscopy and X-ray diffractometry. The experimental results show that the geopolymerization products include amorphous geopolymer gel, calcium silicate hydrate and calcium aluminate hydrate, which enhance the binding of soil particles and filled the voids, and thus improve the mechanical properties and road performance of stabilized sludge. It provides experimental foundation for the practical application of geopolymer stabilized sludge in pavement construction.

Key words: stabilized sludge, slag-fly ash geopolymer, unconfined compressive strength, water stability, dry shrinkage, temperature shrinkage, stabilization mechanism, roadbed material

中图分类号:

TU52

杨振甲, 何猛, 吴杨, 史钰鹏, 孙亮, 潘竹, 张默. 矿渣-粉煤灰地聚物固化淤泥力学性能和路用性能研究[J]. 硅酸盐通报, 2022, 41(2): 693-703.

YANG Zhenjia, HE Meng, WU Yang, SHI Yupeng, SUN Liang, PAN Zhu, ZHANG Mo. Mechanical Properties and Road Performance of Slag-Fly Ash Geopolymer Stabilized Sludge[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(2): 693-703.

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