基于金属硅粉发气的多孔地聚合物制备及性能研究

doi:10.11896/cldb.24120078

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Abstract This study presents a novel, environmentally friendly method for producing porous geopolymers using in-situ gas generation from metallic silicon powder at ambient temperature. This approach offers a significant advantage over conventional autoclaved aerated concrete (AAC) production by eliminating the energy-intensive autoclaving process and simplifying the manufacturing procedure, thus reducing both production costs and environmental impact. The influence of water glass modulus, water-to-solid ratio, and metallic silicon powder content on gas generation, pore structure, and mechanical properties was systematically investigated to optimize the process parameters. The results demonstrate that the gas generation process exhibits a 15～30 minute induction period, facilitating convenient on-site casting of the geopolymer slurry. The resulting mate-rial achieved a 120%—140% expansion rate with an average pore size of 270—342 μm. Its compressive strength reaches 3.01 MPa and 2.68 MPa after 96 h of steam curing and 28 d of natural curing, respectively. Compared to the aluminum powder-based gasification method, this technique yields porous geopolymers with a more uniform pore size distribution and a more regular pore structure. This research offers a promi-sing new avenue for developing sustainable, eco-friendly, and on-site castable thermal insulation building materials with considerable engineering applications.

Key words： geopolymer metallic silicon powder gas generation induction period

Published: 10 December 2025 Online: 2025-12-03

CLC number:

TU528

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	Articles by authors
	LI Fangxian
	WANG Zijing
	XI Shuang
	GU Yajie
	WEI Jiangxiong
	YU Qijun

Cite this article:

LI Fangxian,WANG Zijing,XI Shuang, et al. Preparation and Properties of Porous Geopolymers via In-situ Gas Generation from Metallic Silicon Powder[J]. Materials Reports, 2025, 39(23): 24120078-6.

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https://www.mater-rep.com/EN/10.11896/cldb.24120078 OR https://www.mater-rep.com/EN/Y2025/V39/I23/24120078

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