Research on the durability of fibre impermeable composite modified anti-corrosion mortar under an acidic environment

Abstract

Concrete corrosion is a prominent problem in sewage environments, and there is a huge demand for engineering repairs. This paper presents a “composite” protection concept, developing a new type of anti-corrosion mortar by adding a variety of high-performance materials such as basalt fibres, polypropylene fibres, mineral admixtures and impermeable agents. In this paper, the acid environment corrosion test was carried out for the new anti-corrosion mortar, and the change rules of water absorption, mass loss rate and compressive strength were obtained. We studied the deterioration mechanism of mortar in different corrosion cycles. We revealed the corrosion mechanism and degradation law of mortar in an acidic environment by combining the test block's apparent morphology and microstructure characteristics after corrosion. The results show that the new anti-corrosion mortar has a dense internal structure, fewer holes, and relatively light corrosion. Compared with ordinary polymer mortar, the water absorption rate of the new anti-corrosion mortar is reduced by 60%, the initial strength is increased by 62%, the strength retention rate is increased by more than 25%, and the corrosion resistance is excellent. The new anti-corrosion mortar has a significant increase in strength and corrosion resistance compared to the polymeric anti-corrosion mortars that are more commonly used in engineering, providing a new technical idea for the protection and repair of wastewater projects.