Properties of Geopolymer-Stabilized Construction Solid Waste Recycled Aggregates

doi:10.16552/j.cnki.issn1001-1625.2025.0185

Abstract

Abstract: A geopolymer composite material was prepared using fly ash, ground granulated blast furnace slag, and alkali activator, which was then mixed with water-glass solution reinforcing recycled aggregate to produce geopolymer-stabilized recycled aggregate. Mechanical and drying shrinkage tests were conducted to investigate the effects of geopolymer content and recycled aggregate reinforcing on material properties. Additionally, SEM micromorphology analysis was performed to examine the reinforcing mechanism of recycled aggregate. The results indicate that the mechanical properties of geopolymer-stabilized recycled aggregate improve with increasing geopolymer content and age, achieving a performance comparable to cement-stabilized macadam, and are further enhanced by water-glass solution reinforcing. However, the drying shrinkage property of geopolymer-stabilized recycled aggregate increases with increasing powder (fly ash and ground granulated blast furnace slag) content, and the total drying shrinkage coefficient is slightly larger than that of cement-stabilized macadam. Nevertheless, water-glass solution reinforcing effectively mitigates drying shrinkage property. Microstructural analysis reveals that water-glass solution reinforcing treatment fills microcracks and pores on the surface of recycled aggregate, thereby enhancing the mechanical strength and drying shrinkage property of geopolymer-stabilized recycled aggregate to a certain extent.

Key words: geopolymer, recycled aggregate, mechanical property, drying shrinkage, reinforcing

CLC Number:

U414

ZHANG Zhengqi, LIU Zhixin, RUI Zhaocheng, SHI Jierong, YANG Xinhong. Properties of Geopolymer-Stabilized Construction Solid Waste Recycled Aggregates[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(9): 3347-3354.

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