Title:
Optimizing Cementitious Materials for SiO2 Aerogel-Gypsum Composites
Author(s):
Yunan Wan and Hongping Zhang
Publication:
Materials Journal
Volume:
123
Issue:
1
Appears on pages(s):
127-138
Keywords:
gypsum-based cementitious materials; SiO2 aerogel inorganic composite materials; solid wastes; water resistance
DOI:
10.14359/51749294
Date:
1/1/2026
Abstract:
To prepare SiO2 aerogel gypsum-based lightweight thermal insulation wall materials with better water resistance, α-hemihydrate gypsum (HG) was used as the main cementitious material. By adding portland cement (PC), fly ash (FA), and hydrated lime (HL), HG was modified. Using these materials, the HG-PC system and HG-PC-FA-HL system were constructed. The effects of inorganic admixture content on the performance of both systems were analyzed. Results show that the mechanical properties and water resistance were improved after adding a certain proportion of mineral admixtures to HG. The mechanical properties and water resistance of the HG-PC-FA-HL system were better than those of the HG-PC system. At the content of 9 wt. % FA, 20 wt. % PC, and 4 wt. % HL, the 28-day strength reached 41.07 MPa (5955 psi), the water absorption after soaking for 48 hours was 12.7%, and the softening coefficient was 0.72.
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