Digital Image Analysis on Structure of Constructional Waste Soil Cemented by Microorganisms

ZHANG Minxia; CHEN Chen; NIU Shuangjian; FENG Congrui; XU Ping; CAI Baoshuai

doi:10.3724/j.gyjzG23080412

Volume 54 Issue 9

Sep. 2024

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ZHANG Minxia, CHEN Chen, NIU Shuangjian, FENG Congrui, XU Ping, CAI Baoshuai. Digital Image Analysis on Structure of Constructional Waste Soil Cemented by Microorganisms[J]. INDUSTRIAL CONSTRUCTION, 2024, 54(9): 43-50. doi: 10.3724/j.gyjzG23080412

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Digital Image Analysis on Structure of Constructional Waste Soil Cemented by Microorganisms

doi: 10.3724/j.gyjzG23080412

1. School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, China;
2. Shenzhen Municipal Engineering Corporation, Shenzhen 518131, China

Received Date: 2023-08-04
Available Online: 2024-10-18

Abstract

Abstract

It is of direct significance to carry out quantitative research on the morphology of microbial cemented constructional waste soil for analyzing the effect of soil improvement. The morphological indexes such as rectangularity, shape indexes, angularity and overall contour coefficients could directly and quantitatively characterize the soil structure, which are important parameters to reflect the stability and cured effect of soil. The apparent scan of the microbial cemented soil by CT was conducted, and the geometric shape parameters (the length, perimeter, area, external rectangular area, and equivalent elliptical perimeter) of cemented soil particles were obtained by the digital image processing technique. The geometric shape coefficient,namely morphological index, was calculated statistically, so as to quantitatively characterize the microbial cemented soil structure and analyze the correlation between geometric shape coefficient and gradation. The results showed: with the increase in the scale of the structure, the shape index and the angularity of the microbial cemented constructional waste soil increased as a whole, the rectangularity and the overall contour coefficient decreased, the structure shape was more irregular. The geometric shape coefficient had a good correlation with the particle gradation of cemented construction waste soil. It was because that the calcium carbonate induced by microbial precipitates covered and accumulated on the surface of the soil particles, increasing the particle size of the waste soil and making the particle surface rougher, and then changing the primary characteristic parameters, affecting the morphological indexes.
- microbial cementation,
- constructional waste soil,
- microscopic structure,
- geometric shape parameter,
- digital image analysis

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References

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