Performance Optimization of All-Solid Waste Non-AutoclavedAerated Concrete

doi:10.16552/j.cnki.issn1001-1625.2025.0443

Abstract

Abstract: In this study, carbide slag was used to replace lime to prepare all-solid waste non-autoclaved aerated concrete. The effects of main process parameters such as calcium-silicon ratio (Ca/Si), water-binder ratio (W/B), alkali activator modulus (M), hydroxypropylmethyl cellulose (HPMC) content and curing conditions on the physical and mechanical properties such as fluidity, foaming curve, cross-sectional pore, water absorption, dry density and compressive strength of non-autoclaved aerated concrete were studied. The hydration products and microstructure of all-solid waste non-autoclaved aerated concrete were analyzed by XRD and SEM. The results show that with the increase of W/B, M and HPMC content, the compressive strength and dry density of all-solid waste non-autoclaved aerated concrete specimens increase first and then decrease. With the increase of Ca/Si, the compressive strength and dry density of all-solid waste non-autoclaved aerated concrete specimens decrease first and then increase. When all-solid waste non-autoclaved aerated concrete obtains good pore structure, good physical and mechanical properties, the optimum process parameters are: Ca/Si of 0.76, W/B of 0.5, M of 1.0, HPMC content of 0.6% (mass fraction), curing temperature of 70 ℃. The main hydration products (calcium silicate hydrate (C-S-H) gel and ettringite) of all-solid waste non-autoclaved aerated concrete after high temperature steam curing are the main providers of concrete strength. C-S-H gel and ettringite make the internal structure of aerated concrete denser.

Key words: all-solid waste non-autoclaved aerated concrete, carbide slag, calcium-silicon ratio, compressive strength, dry density, microstructure

CLC Number:

TU528.7

YAO Xianhua, HAN Linyan, LIU Li, LI Zhicheng, WAN Mingduo, LIU Shiwen, CHEN Shengqiang, SHANGGUAN Linjian. Performance Optimization of All-Solid Waste Non-AutoclavedAerated Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(10): 3734-3746.

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