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Related Concept Videos

Porosity in Cement Paste01:18

Porosity in Cement Paste

88
The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is...
88

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Updated: May 7, 2025

Sandy Soil Improvement through Microbially Induced Calcite Precipitation MICP by Immersion
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Experimental study on optimization of pipe jacking mud mixture ratio based on MICP technology.

Guangqin Cui1, Hang Zhang2, Chenguang Ma3

  • 1The Inner Mongolia University of Science and Technology School of Civil Engineering, Baotou, 014010, China.

Scientific Reports
|December 29, 2024
PubMed
Summary
This summary is machine-generated.

Microbial-Induced Calcium Carbonate Precipitation (MICP) enhances pipe jacking slurry, significantly reducing friction and improving soil stability. This innovative approach strengthens soil by filling pores with calcium carbonate crystals, boosting cohesion and friction angle.

Keywords:
Carrying-soil effectFriction reduction effectMICPMechanical propertiesMicrostructureMud

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Area of Science:

  • Geotechnical Engineering
  • Biotechnology
  • Construction Materials Science

Background:

  • Pipe jacking construction faces challenges like excavation unloading and soil adhesion, impacting stability.
  • Pipe jacking slurry is crucial for friction reduction and strata support during tunneling.
  • Existing slurries require enhancement to improve performance and soil stabilization.

Purpose of the Study:

  • To integrate Microbial-Induced Calcium Carbonate Precipitation (MICP) technology into pipe jacking slurry.
  • To enhance the friction-reduction capabilities of the slurry.
  • To improve the stability of the soil surrounding the pipe during jacking operations.

Main Methods:

  • Determined optimal MICP-slurry formulation using uniform design.
  • Conducted model tests to evaluate friction reduction efficacy.
  • Investigated strata reinforcement mechanisms using soil mechanics and Scanning Electron Microscopy (SEM).

Main Results:

  • Optimal MICP-slurry composition identified: bentonite: sodium carboxymethyl cellulose: soda ash: polyacrylamide: xanthan gum = 12%: 0.31%: 0.36%: 0.25%: 0.54%.
  • MICP-slurry reduced the friction coefficient by 42.2%.
  • MICP treatment increased soil cohesion by 38.12% and internal friction angle by 14.01%.

Conclusions:

  • MICP-slurry effectively reduces friction and enhances soil mechanical properties in pipe jacking.
  • Calcium carbonate precipitation by MICP fills soil pores, increasing inter-particle forces and improving stability.
  • This technology offers a promising solution for improving pipe jacking construction efficiency and safety.