Woratid Wongpattanawut
Borvorn Israngkura Na Ayudhya

The objective of this study was to investigate the effect of curing temperature on the mechanical properties of sanitary ware porcelain powder-based geopolymer paste and mortar under various curing temperatures. The setting time, porosity, water absorption, and compressive strength of specimens mixed with alkaline concentrations of ۸M, ۱۰M, ۱۲M, and ۱۴M were compared. All mortar cube (۵۰×۵۰×۵۰ mm) specimens were placed into drying ovens for ۲۴ hours at ۶۰°C, ۷۵°C, ۹۰°C, and ۱۰۵°C, respectively. The specimens were then air-cured for ۱, ۳, ۷, ۱۴, and ۲۸ days. The results showed that the elevated curing temperature accelerated the polymerization process of the porcelain geopolymerization reaction. The setting time varied between ۸۹ mins and ۳۸۰ mins. It showed variability depending on alkaline concentration and initial curing temperature. The setting time of pastes decreased when alkaline concentrations increased. An increasing temperature in the drying oven decreased the initial and final setting times. Similar to this, the rate of water absorption and permeability of porcelain-based geopolymer mortar specimens decreased with drying oven temperatures and increments in alkaline concentration. The lowest water absorption and porosity of the specimen were ۲.۱% and ۱۵.۷%, respectively. The compressive strength increased as drying oven temperatures and alkaline concentrations increased. The highest ۲۸ day compressive strength was found in ۱۴M specimens with ۱۰۵°C curing temperatures. The ultimate compressive strength was ۶۴.۴۵ N/mm۲. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were investigated to study the microstructural properties of the geopolymers. Doi: ۱۰.۲۸۹۹۱/CEJ-۲۰۲۳-۰۹-۰۸-۰۱ Full Text: PDF

Geopolymer; Setting Time; Porosity; Porcelain; Mortar.