Experimental Study on Chloride Resistance of Concrete Containing Recycled Plastic as Fine Aggregate

Abstract

Plastic waste is one of the most factors with a negative impact on the environment. The goal of many researchers is to use plastic waste in concrete while taking advantage of its properties to improve the properties of concrete in some applications. This study aims to investigate the concrete resistance to chloride attacks by using plastic waste as a partial replacement for sand in the concrete. The effects of the plastic fine aggregate (PFA) on the mechanical and physical properties of concrete were studied. Four concrete mixes (normal concrete, concrete with superplasticizer or/and micro-silica) were prepared as control specimens. In addition, three concrete mixes were prepared with 10%, 20%, and 30% replacement of sand by PFA. The experimental results showed a slight decrease in the unit weight and the mechanical properties of concrete until the ratio of 20% PFA. However, the results showed significant improvements in the resistance of PFA concrete to chloride attack under normal, cyclic, and aggressive chloride attack conditions compared to the concrete with reliable protection methods.

Enhancing Concrete Durability Through Crystalline Waterproofing Admixtures: A Comprehensive Performance Evaluation

“…Among these admixtures, crystalline waterproofing admixtures (CWA) consist of Portland cement, specially treated quartz sand, and a combination of "active chemicals." The specific chemical composition of these active chemicals is proprietary and undisclosed by manufacturers [18][19][20]. These chemicals react with water and cement particles in the concrete, resulting in an increased density of calcium silicate hydrates and the formation of pore-blocking precipitates in capillaries and microcracks [21].…”