Compressive strength studies of concrete with partial replacement of cement and fine aggregate with incinerated solid waste and recycled plastic waste

Abstract

Solid waste has become a nuisance in the majority of the cities in the country. Many cities have failed to better management of solid waste. The use of solid waste is one of the environment-friendly options available to reduce environmental impact. This research investigates the effect of utilizing Incinerated Solid Waste (ISW) and Recycled Plastic Waste (RPW) as a partial replacement for cement and fine aggregate. The standard tests on cement, fine aggregate and coarse aggregate were conducted. Experimental studies were conducted to use ISW and RPW as a replacement for fine aggregate in varying percentages and ISW as a replacement for cement in varying percentages keeping 20% sand replacement by incinerated solid waste constantly. Concrete cubes of sizes 150 × 150 × 150 mm were cast and slump tested. The compressive strength tests for concrete curing ages 7-day and 28-day were determined, respectively. Workability decreased as cement and fine aggregate replacement increased. The experimental investigation concluded that up to 20% of fine aggregate and 15% of cement replacement with ISW rendered better concrete strength. With a higher percentage of cement replacement, the reduction in strength may be attributed to the reduced formation of calcium silicate compounds. The results have shown that blended concrete can reduce environmental degradation attributed to solid waste. Further studies on the chemical analysis of the ingredients and durability of mixes may help fortify the present results.