Kinetic analysis and thermodynamic simulation of alkali‐silica reaction in cementitious materials. Issue 3 (16th August 2018)

• Record Type: Journal Article
• Authors: Guo, Shuaicheng; Dai, Qingli; Chang, Liang; Hu, Yunhang; Xie, Xinfeng; Si, Ruizhe; Wang, Jiaqing
• Is Part Of: Journal of the American Ceramic Society. Volume 102:Issue 3(2019)
• Page Start: 1463
• Page End: 1478
• Publication Date: 2018-08-16
• Subjects: alkali‐silica reaction -- kinetic model -- silica dissolution -- thermodynamic model; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.15961
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: This work aims to study the alkali‐silica reaction (ASR) with incorporated kinetic‐thermodynamic analysis. The model reactant tests were first conducted to study the silica dissolution in the simulated pore solution under different temperatures. Then, the kinetic model for silica dissolution was further improved by considering the influence of effective surface area. The improved kinetic model was also incorporated into the GEMS thermodynamic simulation. The model analysis demonstrated the silica dissolution rate is decreased mainly caused by reduced hydroxyl activity with increased saturation degree. The dissolved silica first reacted with the portlandite phase and formed the Calcium–Silicate–Hydrate (CSH) gel. The ASR gel can only be generated under high silicate ion concentration after the consumption of portlandite.