Investigation on Strength and Shrinkage of Eco-Friendly Concrete Containing Recycled Aggregate and Using Ground Bottom Ash and Calcium Carbide Residue Mixture as a Blinder

Abstract

The objectives of this research are to study the compressive strength, modulus of elasticity, and shrinkage of concrete using ground bottom ash (GBA) mixed with ground calcium carbide residue (GCR) as a binder and containing recycled concrete aggregate as coarse aggregate. A ratio of GBA to GCR was 70:30 by weight. A binder content of concrete was 550 kg/m³ and water to binder ratio (w/b) was 0.30. Sodium hydroxide was used as a strength accelerator at rates of 0, 0.5, 1, 1.5 and 3% by weight of binder. The results were found that the recycled aggregate concrete made with GBA-GCR mixture (CBN) had lower compressive strength than that of conventional concrete (CT). However, the compressive strength at 28 days of concrete made with GBA-GCR mixture as a binder and containing recycled aggregate and activated by 1% NaOH (CB1N) was 3.48 MPa which was the same as that of CT concrete. Moreover, the modulus of elasticity of concrete made with GBA-GCR mixture and coarse recycled concrete aggregate was lower than CT concrete. In addition, the use of GBA-GCR mixture as a binder could also reduce the shrinkage of concrete as compared with the CT concrete.