Hydration behavior and chloride ingress in cement mortar incorporating a novel core@shell admixture. (April 2022)

• Record Type: Journal Article
• Authors: Wang, Xuhui; Xu, Jinxia; Guo, Mingzhi
• Is Part Of: Cement & concrete composites. Volume 128(2022)
• Publication Date: 2022-04
• Subjects: Layered double hydroxide (LDHs) -- Linde type A zeolite (zeolite-LTA) -- Zeolite@LDHs core@shell material -- Cement mortar -- Chloride diffusion resistance; 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.2022.104461
• Languages: English
• ISSNs: 0958-9465

Abstract

Abstract: A coupled addition of layered double hydroxides (LDHs) (with a high chloride binding capacity) and zeolite (as a pozzolanic material) in concrete is conducive to reducing external chloride ingress. This study aims to evaluate the chloride transport resistance of concrete using a novel Linde type A zeolite (zeolite-LTA)@Mg–Al LDHs (zeolite@LDHs) core@shell material. The effect of the core@shell admixture on cement hydration and chloride penetration into cement mortar were investigated by a comparative experiment. The results showed that the addition of zeolite@LDHs material in cement mortar shortened the setting time, slightly reduced the hytration heat, and exerted a marginal effect on the compressive strength and flexural strength. More importantly, a synergistic effect of LDHs' excellent chloride binding ability and zeolite induced pore refinement remarkably augments the chloride diffusion resistance of the zeolite-LTA@LDHs incorporated cement mortars.