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<p>As a kind of green and energy-efficient building material, bio-cement has received continuous attention in the field of ecological environment and construction in recent years. At the same time, desert sand is a recognized natural waste with no building use value. It is not only in line with the international advocacy of low-carbon environmental protection, but also can turn waste into treasure, if the two can be scientifically combined. In this work, the combination of plant-based bio-cement (PBBC) and fly ash (FA) improves the uniaxial compression strength of desert sand and improves its permeability resistance and water erosion resistance. The effect of fly ash on improving the curing level of PBB was expounded, which is based on the macroscopic mechanical properties and microscopic characteristics of the improved sand. And we used image processing technology to analyze the crack evolution of the sample under uniaxial compression. The results show that the increase of FA content increases the peak compressive strength of PBBC-FA-modified desert sand. UCS treated with PBBC plus 7% FA (770.01&#xa0;kPa) was about 50 times higher than that treated with PBBC alone (15.27&#xa0;kPa). The immersion curve of the sample shows that the immersion process of the improved desert sand consists of three stages. It is also found that the lowest water content of the improved desert sand is 5.73%. The permeability of the sample and the amount of calcium carbonate precipitation increased with the increase in the dosage. The cracks of the sample evolved along the uniaxial compressive strength, from microcrack propagation, interpenetration, penetration, lateral expansion damage, and complete failure.</p>

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Analysis and Evaluation of Desert Sand Performance After Improvement of Plant-Based Bio-Cement (PBBC)

  • 期刊论文

  • 发表日期：

    2025年3月28日

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  • Xiao Fu,
  • Wan-jun Ye,
  • Gang Yuan,
  • Jiang Kang,
  • Rui-yuan Niu

摘要

As a kind of green and energy-efficient building material, bio-cement has received continuous attention in the field of ecological environment and construction in recent years. At the same time, desert sand is a recognized natural waste with no building use value. It is not only in line with the international advocacy of low-carbon environmental protection, but also can turn waste into treasure, if the two can be scientifically combined. In this work, the combination of plant-based bio-cement (PBBC) and fly ash (FA) improves the uniaxial compression strength of desert sand and improves its permeability resistance and water erosion resistance. The effect of fly ash on improving the curing level of PBB was expounded, which is based on the macroscopic mechanical properties and microscopic characteristics of the improved sand. And we used image processing technology to analyze the crack evolution of the sample under uniaxial compression. The results show that the increase of FA content increases the peak compressive strength of PBBC-FA-modified desert sand. UCS treated with PBBC plus 7% FA (770.01 kPa) was about 50 times higher than that treated with PBBC alone (15.27 kPa). The immersion curve of the sample shows that the immersion process of the improved desert sand consists of three stages. It is also found that the lowest water content of the improved desert sand is 5.73%. The permeability of the sample and the amount of calcium carbonate precipitation increased with the increase in the dosage. The cracks of the sample evolved along the uniaxial compressive strength, from microcrack propagation, interpenetration, penetration, lateral expansion damage, and complete failure.