Title:
Optimizing Cementitious Materials for SiO2 Aerogel-Gypsum Composites (Prepublished)
Author(s):
Yunan Wan and Hongping Zhang
Publication:
Materials Journal
Volume:
Issue:
Appears on pages(s):
Keywords:
gypsum-based cementitious materials; SiO2 aerogel inorganic composite materials; solid wastes; water resistance
DOI:
10.14359/51749294
Date:
10/30/2025
Abstract:
To prepare the 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, respectively. The effects of inorganic admixture content on the performance of both systems were analyzed. Results show that the mechanical properties and water resistance are improved after adding a certain proportion of mineral admixtures to HG. The mechanical properties and water resistance of the HG-PC-FA-HL system are better than the HG-PC system. At the content of 9 wt% FA, 20 wt% PC, and 4 wt% HL, the 28-day strength reaches 41.07 MPa (5955 psi), the water absorption after soaking for 48 h is 12.7 %, and the softening coefficient is 0.72.