This analysis explores how HPMC and VAE influence the mechanical properties and adhesive strength of geopolymer mortars, indicating potential improvements for construction materials.
The delamination of building facades urgently requires inorganic adhesive mortar with high adhesive durability. Geopolymer (GP) mortars present an environmentally friendly alternative to Portland cement (PC). But the effects of common polymer additives on GP mortars remain underexplored. This study investigates the influence of hydroxypropyl methylcellulose (HPMC) and vinyl acetate-ethylene (VAE) on the workability, mechanical properties, durability, and microstructure of GP mortar. Results indicate that an optimal HPMC content (0.4 wt%) improves fluidity (about 6%), compressive strength (about 16%), and adhesive strength (about 20%) of GP mortar by introducing uniform microbubbles. However, excessive HPMC reduces flowability and adhesion due to its thickening effect. In contrast, VAE significantly enhances adhesive strength (about 28%) despite decreasing compressive strength ( about 17%) by inhibiting the alkali-activation. This improvement is attributed to a continuous polymer film that forms physical interlocks and chemical bonds with the GP matrix. Furthermore, HPMC was found to improve the durability of GP mortar, whereas VAE did not. These findings provide crucial guidance for formulating high-performance GP adhesive mortars for building applications.
No takes yet. Share an insight, caveat, or question.
Ji et al. (2025) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: