Effect of nitrite intercalated Mg−Al layered double hydroxides on mortar durability under Cl⁻ and SO₄²⁻ coexisting environment

Abstract

The aim of this paper is to investigate the effect of nitrite intercalated Mg−Al layered double hydroxides (Mg−Al LDH−NO₂) on mortar durability under the coexisting environment of Cl⁻ and SO₄²⁻. Cl⁻ and SO₄²⁻ binding properties of Mg−Al LDH−NO₂ in simulated concrete pore solutions, Cl⁻ and SO₄²⁻ diffusion properties of mortars with Mg−Al LDH−NO₂ were examined. The steel corrosion and resistance of mortar against SO₄²⁻ attack were also evaluated. The results indicate that Mg−Al LDH−NO₂ can effectively adsorb the Cl⁻ and SO₄²⁻ in simulated concrete pore solution, and inhibit the diffusion of Cl⁻ and SO₄²⁻ into cement mortars. The presence of SO₄²⁻ can greatly affect the uptake amount of Cl⁻, and there is a coupled effect of Cl⁻ and SO₄²⁻ on their penetration into mortar specimens. In addition, Mg−Al LDH−NO₂ can greatly upgrade the resistance of mortars against SO₄²⁻ attack and well prevent the steel from corrosion. However, Cl⁻ will aggravate the SO₄²⁻ attack and SO₄²⁻ can initially decrease and then increase the steel corrosion.

Keywords

layered double hydroxides / mortar durability / 4²⁻ attack')">SO₄²⁻ attack / steel corrosion / 4²⁻ coexisting environment')">Cl⁻ and SO₄²⁻ coexisting environment

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