4.7 Article

Effect of sulfuric acid on cementitious composites containing ethylene-vinyl acetate and styrene-butadiene rubber

Journal

JOURNAL OF BUILDING ENGINEERING
Volume 80, Issue -, Pages -

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ELSEVIER
DOI: 10.1016/j.jobe.2023.108024

Keywords

Ethylene-vinyl acetate; Styrene-butadiene rubber; Composites; Sulfuric acid; Degradation resistance; Microstructure

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This study focuses on the influence of EVA and SBR on the sulfuric acid resistance of OPC-SAC repair mortar. The results showed that EVA and SBR can improve the mortar's resistance to sulfuric acid attack and have a regulating effect on the pore structure.
This study focuses on the influence of ethylene-vinyl acetate (EVA) and styrene-butadiene rubber (SBR) on the sulfuric acid resistance of ordinary Portland cement (OPC)-sulfoaluminate cement (SAC) repair mortar. Mortars were exposed to sulfuric acid solution for 60 or 180 days. The degradation kinetics, mineralogical as well as microstructural changes of these samples were analyzed. The results showed that EVA and SBR decreased the mechanical properties of OPC-SAC repair mortar but improved the mortar resistance to sulfuric acid attack. Both EVA and SBR could homogenize and refine the pore structure, reduce the number of connected and open pores, and fill the invasion channels of H+ and SO42 . The dual three-dimensional network structure formed by polymers in OPC-SAC mortar could delay the propagation of microcracks and limit the residual hydration and corrosion products around the core, forming a protective barrier.

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