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Performance Optimization of Alkaline Multi-Industrial Waste-Based Cementitious Materials for Soil Solidification.
Xiaoli Wang1, Xiancong Wang1, Pingfeng Fu1
1School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Eco-friendly cementitious materials using alkaline multi-industrial waste (AMIW) enhance soil stabilization. This AMIW-based material improved soil strength by 24% compared to ordinary Portland cement (OPC), offering a sustainable alternative.
Area of Science:
- Materials Science
- Civil Engineering
- Environmental Engineering
Background:
- Soil stabilization is crucial for infrastructure development.
- Traditional methods often rely on ordinary Portland cement (OPC), which has a significant carbon footprint.
- Developing sustainable and eco-friendly alternatives is essential for modern construction.
Purpose of the Study:
- To develop and optimize eco-friendly cementitious materials for soil stabilization using alkaline multi-industrial waste (AMIW).
- To investigate the effect of AMIW composition and curing parameters on the unconfined compressive strength (UCS) of stabilized soil.
- To compare the performance of AMIW-stabilized soil with OPC-stabilized soil.
Main Methods:
- Orthogonal experiments were used to determine the optimal composition of AMIW, including steel slag (SS), blast furnace slag (BFS), carbide slag (CS), fly ash (FA), and flue gas desulfurization gypsum (FGDG).
- Response surface methodology (RSM) with central composite design (CCD) was employed to optimize curing parameters such as moisture content, curing agent content, and mix-grinding time.
- Rietveld refinement, mercury intrusion porosimetry (MIP), and scanning electron microscopy (SEM) were used to analyze the hydration products and microstructure of the stabilized soil.
Main Results:
- The optimal AMIW composition was determined as SS:CS:FGDG:BFS:FA = 15:10:15:44:16.
- Optimal curing conditions yielded a maximum 7-day unconfined compressive strength (7d UCS) with 18.51% moisture, 11.46% curing agent, and 26.48 min mix-grinding time.
- The AMIW-stabilized soil exhibited a 24% higher 7d UCS than OPC-stabilized soil.
- Hydration products included C-S-H and ettringite, with increased content over curing time (7 to 28 days).
- Microstructural analysis showed denser structures and reduced pore size with extended curing, correlating with strength improvement.
Conclusions:
- AMIW-based cementitious materials offer a promising eco-friendly solution for soil stabilization.
- Optimized composition and curing significantly enhance the mechanical properties of the stabilized soil.
- The developed material demonstrates superior performance compared to OPC, contributing to sustainable construction practices.
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