REMISSION OF MOISTURE LOSS AND CRACKING OF BOTTOM ASH BASED GEOPOLYMER-SOIL SOLIDIFIED BLOCKS BY ADDING COCONUT FIBER

WANG Yi; ZHOU Min; XIANG Yuwei; DONG Yiqie; LI Shiyao; HOU Haobo

doi:10.13205/j.hjgc.202302015

Volume 41 Issue 2

Feb. 2023

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WANG Yi, ZHOU Min, XIANG Yuwei, DONG Yiqie, LI Shiyao, HOU Haobo. REMISSION OF MOISTURE LOSS AND CRACKING OF BOTTOM ASH BASED GEOPOLYMER-SOIL SOLIDIFIED BLOCKS BY ADDING COCONUT FIBER[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(2): 106-112,180. doi: 10.13205/j.hjgc.202302015

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REMISSION OF MOISTURE LOSS AND CRACKING OF BOTTOM ASH BASED GEOPOLYMER-SOIL SOLIDIFIED BLOCKS BY ADDING COCONUT FIBER

doi: 10.13205/j.hjgc.202302015

WANG Yi¹,
ZHOU Min^{1,2
,
,},
XIANG Yuwei¹,
DONG Yiqie^1,3,
LI Shiyao¹,
HOU Haobo^1,3

1. School of Resource and Environmental Sciences, Wuhan University, Wuhan 430072, China;
2. Hubei Environmental Remediation Material Engineering Technology Research Center, Wuhan 430072, China;
3. Wuhan University (Zhaoqing) Resources and Environmental Technology Institute, Zhaoqing 526238, China

Received Date: 2011-11-10
Available Online: 2023-05-25
Publish Date: 2023-02-01

Abstract

Abstract

Aiming at the problems of poor toughness and high brittleness of the final shape caused by water loss during the solidification of heavy metal contaminated soil by geopolymer, the feasibility of adding coconut fiber to the polymer soil solidified body in the ash base to alleviate its water loss shrinkage/cracking was explored. By simulating the changing trend of soil surface drying and cracking under the condition of frequent rain in alternate spring and summer and continuous high temperature in summer, the mechanical strengthening effect of fibers was explored by comparing the shrinkage and cracking of solidified blocks with or without heavy metal pollution. The results showed that the water loss rate of soil eroded by heavy metals was 9.0% higher than that of undisturbed soil, the cracking factor increased by 12.9%, and the shrinkage rate increased by 34.6% compared with the undisturbed soil in the 25-day sample. The cracking resistance of soil cured by geopolymer was improved, and the cracking factor of geopolymer cured blocks optimized by adding fiber in continuous drying test was further reduced, the shrinkage rate decreased by 71.3% and the cracking factor was only 4.9% to 5.1% of the undisturbed soil, and the minimum cracking factor was 0.0015 after four cycles of drying and wetting. Geopolymer-coconut fiber composite ameliorated the heavy metal contaminated soil and had a good cracking resistance effect.
- solidification,
- geopolymer,
- coconut fiber,
- cracking index factor

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References(26)

References

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