Effect of anions on behavior of mortar exposed to alkali–silica reaction. (20th August 2020)

• Record Type: Journal Article
• Authors: Liao, Yingdi; Deng, Ziming; Ma, Jingjing; Zhang, Yan; Shen, Chun; Chen, Da
• Is Part Of: Construction & building materials. Volume 252(2020)
• Publication Date: 2020-08-20
• Subjects: Alkali–silica reaction -- Mortar -- Mechanical properties -- Water permeability -- In-situ test; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2020.119117
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: ASR susceptibility to external alkali/salt without internal addition is studied. Binomial function is proposed for the evolution of compressive strength with time. Elastic modulus versus expansion of mortar is dependent on the anion type. Compressive strength and water permeability show negative linear relationship. A quantitative assessment is proposed for in-situ concrete structures under ASR. Abstract: To investigate the effect of alkali–silica reaction (ASR) on concrete structures in saline and alkaline service environments, mortar containing reactive aggregates is immersed in 5% and 10% NaCl solutions, 5% and 10% NaOH solutions, and deionized water for 210 d. The mortar's mechanical properties and durability are thereafter tested, and their relationships are analyzed. The results show that external hydroxyl ions negatively affect the aforementioned properties, whereas the effect of chloride ions is minimal. Based on the linear relationship between compressive strength and water permeability, this study proposes a method to evaluate the ASR deterioration of concrete structures.