标题: Curing effects of fly ash-based geopolymer on soils around mining areas: properties and mechanisms

作者: Zhao, SY (Zhao, Suyun); Xiang, YW (Xiang, Yuwei); Li, SY (Li, Shiyao); Wang, Y (Wang, Yi); Lu, HJ (Lu, Haijun); Hou, HB (Hou, Haobo); Zhou, M (Zhou, Min)

来源出版物: ENVIRONMENTAL EARTH SCIENCES 卷: 81 期: 18 文献号: 455 DOI: 10.1007/s12665-022-10549-9 出版年: SEP 2022

摘要: Soil pollution in mining areas has become a popular topic in the field of environment science. This study aims to solidify contaminated soil and reduce environmental pressure in mining areas. In view of the soil around a manganese tailing pond in Yunnan, China, fly ash was used as the geopolymer raw material to solidify the soil under the condition of alkali excitation, and the performance parameters of the solidified product were determined through mechanical and structural property tests. The former showed that the mechanical properties were gradually improved with the increase in distance between the soil and the mining center and the geopolymer content. Compressive and shearing strengths were up to 2159 and 205 kPa, respectively. XRD showed that the crystal phase significance of the soil decreased after the addition of geopolymer. SEM shows that the local density exists when the geopolymer content is low, and the solidified body forms a high-integrity multilayer structure when the geopolymer content is high. The infrared spectrum showed that the increase in geopolymer content is beneficial to the integrity of the structure and the improvement of performance. These results indicate that fly ash geopolymer (FAG) has good feasibility in the stabilization of trace metals in the soil of mining areas.

作者关键词: Fly ash; Geopolymer; Tailings pond; Mechanical property; Structural property

地址: [Zhao, Suyun; Xiang, Yuwei; Li, Shiyao; Wang, Yi; Hou, Haobo; Zhou, Min] Wuhan Univ, Sch Resource & Environm Sci, Wuhan, Peoples R China.

[Hou, Haobo; Zhou, Min] Hubei Environm Remediat Mat Engn Technol Res Ctr, Wuhan, Peoples R China.

[Lu, Haijun] Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan, Peoples R China.

通讯作者地址: Hou, HB; Zhou, M (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan, Peoples R China.

Hou, HB; Zhou, M (通讯作者)，Hubei Environm Remediat Mat Engn Technol Res Ctr, Wuhan, Peoples R China.

电子邮件地址: houhb@whu.edu.cn; zhoumin@whu.edu.cn

影响因子：3.119