COMPRESSIVE STRENGTH OF RECYCLED AGGREGATED CONCRETE FROM CONCRETE WASTE AND PLASTIC WASTE

Abstract

Currently, the main material used in various construction materials is concrete, which is a composite material containing cement, water, and aggregate. These ingredients are materials derived from sometimes limited natural resources. In addition, economic growth today uses a variety of materials and generates a lot of waste that directly affects the environment. This research compared concrete mixes using the wastes of concrete piles as aggregate and replacing 10, 20, or 30 % (v/v) of fine aggregates with plastic waste (PW) from the recycling process, called Recycled Aggregate Concrete or RAC. Sensors were installed on the concrete surface of samples to determine the early movement of concrete particles under compressive load. It was found that the RAC developed greater compressive strength compared to ordinary concrete using natural ingredients. Increasing the proportion of fine aggregate replacement with plastic waste in RAC decreased the maximum compressive strength and the rate of compressive strength development. In a similar manner, the repeated use of RAC as aggregate affected the compressive strength of the concrete and the rate of development. Increasing plastic replacement in the recycled concrete had a more substantial impact on recycled concrete strength than increasing the number of recycle times. PW replacement of 10 % of the fine aggregates is recommended.