Development of recycling technology from waste aggregate and dust from waste concrete

Abstract

Much construction waste is produced during demolishing old buildings. We have considerable interest in recycling part of the construction waste because it is a cause of environmental pollution. So, research and development concerning recycling technology from waste aggregate and dust from waste concrete is constantly increasing. In this study, we manufactured a modified sulfur concrete (MSC) that has superior physical properties such as compressive strength above 78.4 MPa and degree of absorption below 0.5%. MSC is a mixture of modified sulfur, waste aggregate and dust from waste concrete. The modified sulfur is prepared by reacting for 4 hours in a chamber at 140 degrees C after mixing dicyclopentadiene (DCPD), oligomer and lowgrade sulfur. As a result of a chemical resistance test for 3 months of the synthetic MSC using recycled aggregate/dust and Portland concrete, a general concrete was seriously corroded and destroyed but the MSC was almost unchanged in weight and exterior appearance. The MSC will, therefore, be utilized as a concrete material for repair/reinforcement work because it has superior chemical resistance and a fast hardening ability.