Laboratory investigation on the strength and freezing-thawing resistance of fly ash based geopolymer stabilized soil

CHEN Zhongqing; ZHU Zewei; LYU Yue

doi:10.16030/j.cnki.issn.1000-3665.202111045

2022 Vol. 49, No. 4

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Article navigation > Hydrogeology & Engineering Geology > 2022 > 49(4): 100-108

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CHEN Zhongqing, ZHU Zewei, LYU Yue. Laboratory investigation on the strength and freezing-thawing resistance of fly ash based geopolymer stabilized soil[J]. Hydrogeology & Engineering Geology, 2022, 49(4): 100-108. doi: 10.16030/j.cnki.issn.1000-3665.202111045

Citation:

CHEN Zhongqing, ZHU Zewei, LYU Yue. Laboratory investigation on the strength and freezing-thawing resistance of fly ash based geopolymer stabilized soil[J]. Hydrogeology & Engineering Geology, 2022, 49(4): 100-108. doi: 10.16030/j.cnki.issn.1000-3665.202111045

Laboratory investigation on the strength and freezing-thawing resistance of fly ash based geopolymer stabilized soil

1.
School of Civil Engineering, Shaoxing University, Shaoxing, Zhejiang　312000, China
2.
Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province, Shaoxing, Zhejiang　312000, China

Received Date: 16 November 2021

Revised Date: 23 December 2021

Publish Date: 25 July 2022

Abstract

Abstract

As a low-carbon cementitious material, the application of fly ash based geopolymer in ground improvement has attracted more and more attention. However, the engineering characteristics of the soil stabilized by alkali activated cementitious material under the freezing-thawing extreme climate conditions are not clear. It is necessary to further study the strength, deformation characteristics and their influencing factors of the improved soil under the freezing-thawing cycle. Several laboratory tests are carried out to investigate the effects of the ratio of silicon to aluminum in raw material (Si/Al), modulus of alkali-activator and alkali solution concentration on the unconfined compressive strength (UCS) and the freezing-thawing resistance of fly ash based geopolymer stabilized soil, and the corresponding micro mechanism. The results show that (1) the UCS of geopolymer stabilized soil decreases with the increasing alkali-activator modulus and the decreasing alkali solution concentration, while increases with the Si/Al value in the range of 1.15 to 1.35, and the unconfined compressive strength of 28 d geopolymer stabilized soil can reach 8.98 MPa. (2) When the Si/Al value changes from 1.25 to 1.35 and the alkali solution concentration is within the range of 5.42 to 22.78 mol/L, the 28 d geopolymer stabilized soil can resist more than one (up to 6) freezing-thawing cycle. (3) The best performance of the freezing-thawing resistance of fly ash based geopolymer stabilized soil is mainly related to large number of Si-rich aluminosilicate gel generated by polymerization, while the highest compressive strength is related to the amount of Al-rich aluminosilicate gel generated by polymerization. The research results will provide technical reference for the mix design of soil stabilization with fly ash based geopolymer, and promote the application of alkali activated cementitious material in ground improvement.
- ground improvement /
- fly ash based geopolymer /
- cohesive soil /
- freezing-throwing cycle /
- unconfined compressive strength

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References

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