Influence of Aluminum Sulfate on the Performance of High-content Circulating Fluidized Bed Fly Ash-based Foam Concrete
DONG Biqin, ZHANG Xiao, LIU Yuantao, HE Xiaowei, WANG Yanshuai*
Shenzhen Key Laboratory for Low-carbon Construction Material and Technology, Guangdong Province Key Laboratory of Durability for Marine Civil Engineering, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, Guangdong, China
Abstract: With the development of the new circulating fluidized bed coal-burning technology, the emission of the circulating fluidized bed fly ash (CFBFA) is increasing. In this work, combined with the high demand of thermal insulation materials in northern China, high dosage CFBFA was used to prepare foam concrete with thermal insulation performance. To tackle the challenges of long setting time and low early strength in foam concrete, aluminum sulfate was introduced. The influence of aluminum sulfate mixture on the density, strength and thermal conductivity of foam concrete was studied. The hydration products and micromorphology of CFBFA-based foam concrete were analyzed by X-ray diffraction (XRD), thermal weight (TG) and scanning electron microscopy (SEM). Moreover, the pore structure of foamed concrete was tested by 3D contourometer. The results showed that aluminum sulfate promoted the early formation of ettringite in the system. Compared with the reference group (0% aluminum sulfate addition), the initial setting time of foam concrete with 15% aluminum sulfate addition was reduced by 470 minutes. The foam concrete with 10% aluminum sulfate addition achieved a 3-day compressive strength of 10.43 MPa and a thermal conductivity of 0.31 W·m-1·K-1, showing its potential for efficient large-scale production.
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2024, Vol. 38 
