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A Novel Method for Preparing Lightweight and High-Strength Ceramisite Coarse Aggregates from Solid Waste Materials.
Xin Xiong1, Zhi Wu1, Pengcheng Jiang1
1School of Materials Science and Engineering, Hunan Institute of Technology, No. 18 Henghua Road, Hengyang 421002, China.
Materials (Basel, Switzerland)
|June 19, 2024
Summary
This study presents a new method for creating lightweight, high-strength ceramisite coarse aggregates using fly ash and coal ash floating beads (CAFBs). The process allows for controlled pore structure, resulting in superior material properties that exceed industry standards.
Area of Science:
- Materials Science
- Civil Engineering
- Waste Utilization
Background:
- Traditional coarse aggregates often have limitations in terms of weight and strength.
- There is a need for sustainable construction materials derived from industrial byproducts like fly ash.
Purpose of the Study:
- To develop a novel method for producing lightweight, high-strength ceramisite coarse aggregates.
- To investigate the influence of coal ash floating beads (CAFBs) on aggregate properties.
- To optimize the manufacturing process for enhanced performance.
Main Methods:
- Utilizing fly ash as the primary material.
- Incorporating coal ash floating beads (CAFBs) with high softening temperatures and hollow spherical structures as pore templates.
- Examining the effect of CAFBs' particle size and quantity on aggregate characteristics.
- Sintering the mixture to form ceramisite aggregates.
Main Results:
- CAFBs provided structural stability to the pore cavities during sintering.
- The pore structure was effectively controlled by adjusting CAFBs' size and quantity.
- Achieved low density (723–855 kg/m³), high compressive strength (8.7–13.5 MPa), and low water absorption (3.00–4.09%).
- The resulting aggregates possess a compact shell and a cellular, uniformly porous inner core.
Conclusions:
- The novel method successfully produced ceramisite coarse aggregates with excellent lightweight and high-strength properties.
- The performance metrics significantly surpassed the requirements of GB/T 17431.1-2010 standards.
- This approach offers a sustainable and effective way to utilize fly ash and CAFBs in construction materials.
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