Evaluation of chloride penetration-related properties in concretes produced with partial replacement of cement by ornamental rock waste

ABSTRACT

Recently, many reinforced concrete structures have shown early pathological manifestations, reducing their service life. Among these manifestations, it is highlighted the reinforcement corrosion caused by the deleterious action of the chloride ions or carbon dioxide. Searching for alternatives to reduce the chloride penetration in concrete, this paper assesses the influence of the partial replacement of Portland cement by ornamental rock waste (ORW). The waste used was characterized by specific gravity, granulometric distribution, X-ray diffraction (XRD) and energy dispersive X-ray fluorescence (EDX). Concretes were produced with substitution of cement by ORW in the levels of 5 %, 7.5 % e 10 % by mass of cement. Of these concretes were evaluated the compressive strength, water absorption by immersion and by capillarity, and chloride penetrability. The results show that the partial replacement up to 7.5 % of cement by ORW led to obtaining a material with behavior similar to the reference concrete in aspects such as mechanical strength, water absorption, and chloride penetrability, providing a sustainable use to a waste that would be discarded in the environment.

Keywords
Ornamental rock waste; Chloride penetration; Concrete durability