ASR potential of alkali-activated soda-lime glass powder in the absence of calcium sources. (May 2023)

• Record Type: Journal Article
• Authors: You, Ilhwan; Seo, Seunghoon; Kim, Minjae; Lee, Seung-Jung; Lee, Namkon; Lee, Yujin; Yoo, Doo-Yeol
• Is Part Of: Cement & concrete composites. Volume 139(2023)
• Publication Date: 2023-05
• Subjects: Alkali-activated material -- Soda-lime glass -- Blast furnace slag -- Alkali-silica reaction; Composite-reinforced concrete -- Periodicals; Concrete -- Periodicals; Composite materials -- Periodicals; Composites de ciment -- Périodiques; Béton -- Périodiques; Composites -- Périodiques; Béton léger -- Périodiques; Cement composites; Composite materials; Composite-reinforced concrete; Concrete; Lightweight concrete; Periodicals; Electronic journals; 620.135
• DOI: 10.1016/j.cemconcomp.2023.105027
• Languages: English
• ISSNs: 0958-9465

Abstract

Abstract: This study aims to investigate the reaction products of alkali-activated soda-lime glass powder (SLGP) in the presence of calcium sources. To that end, SLGP, blast furnace slag (BFS), and their mixtures were activated using a solution mixed with sodium silicate and sodium hydroxide. To demonstrate their macroscopic behaviors, such as strength development and swelling capacity, hardened synthetics were analyzed using mercury intrusion porosimetry, X-ray diffraction, thermogravimetry, Fourier-transform infrared spectroscopy, scanning electron microscopy, electron dispersive spectroscopy, and nuclear magnetic resonance. The results show that the activation of SLGP with BFS significantly reduced the compressive strength of the synthetics and formed alkali–calcium-silicate hydrates (N-(C)–S–H gels) as binding substances, which had morphological and chemical similarities to swellable alkali–silica reaction (ASR) gels. However, a combination with the BFS transformed the SLGP-products into cementitious C-(N)-A-S-H gels and mitigated not only strength loss but also the swelling phenomena. Based on these results, incorporating SLGP within 50% of the BFS-based synthetics is recommended. Highlights: The properties of alkali-activated synthetics with SLGP and BFS are investigated. SLGP-dominant synthetics are mainly composed of Q 3 silicates which have similarities to the ASR gels. Excessive use of SLGP produces swellable ASR-like gels, resulting in expansion with damage. The incorporation of Ca-based BFS can convert ASR-like gel to C-(N)-A-S-H gel.