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Study on Strength, Water Stability, Shrinkage, and Microstructure of CFB Slag Modified Cement Stabilized Clay
Mingkai Zhou1,2, Xinyue Liu2, Xiao Chen1,2
1State Key Laboratory Silicate Materials for Architecture, Wuhan University of Technology, Wuhan 430070, China.
Materials (Basel, Switzerland)
|December 10, 2021
Summary
Circulating fluidized bed slag (CFBS) enhances cement-stabilized soil performance. Adding CFBS improves mechanical strength, water stability, and reduces shrinkage, with optimal results at a 70% dosage.
Area of Science:
- Civil Engineering
- Materials Science
- Environmental Engineering
Background:
- Circulating fluidized bed slag (CFBS) is a coal combustion byproduct.
- Industrial waste utilization is crucial for sustainable construction.
- Cement-stabilized soil is widely used in infrastructure projects.
Purpose of the Study:
- To investigate the effects of CFBS on cement-stabilized soil properties.
- To evaluate CFBS as a sustainable additive in construction materials.
- To understand the micro-mechanisms behind CFBS performance enhancement.
Main Methods:
- Laboratory experiments were conducted to test mechanical properties, water stability, and shrinkage.
- X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) were used to analyze hydration and morphology.
- Various dosages of CFBS were incorporated into cement-stabilized clay.
Main Results:
- Cement-CFBS-stabilized soil showed superior mechanical strength and water stability compared to plain cement-stabilized soil.
- CFBS significantly reduced shrinkage deformation in the stabilized soil.
- Optimal performance was achieved with a 70% CFBS addition, demonstrating enhanced durability.
- Microscopic analysis revealed increased gel production and denser structures due to CFBS's active silicon aluminum oxide.
Conclusions:
- CFBS effectively improves the engineering properties of cement-stabilized soil.
- The active components in CFBS contribute to a denser microstructure and enhanced durability.
- CFBS offers a sustainable solution for waste utilization in civil engineering applications.
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