Effect of Pozzolanic Properties of Waste-Paper Pulp Ash in High Performance Concrete

Abstract

The use of huge amounts of concrete has led to an increase in the focus on High Performance Concrete (HPC). This study examined how Waste Paper Pulp Ash (WPPA) pozzolanic qualities affected HPC. WPPA was used to replace PLC at levels of 5, 10, 15 and 20%, respectively. With a characteristic strength of 50N/mm 2 , the COREN Mix Design Manual was followed in the adoption of the concrete mix design. A 150 by 150 by 150 mm concrete cube was cast, and it was cured in water for 7, 28, and 56 days. The X-ray fluorescence (XRF) method was used to ascertain the chemical composition of the WPPA. For fresh concrete, tests for compacting factor and slump were performed; for hardened concrete, tests for density and compressive strength were performed. The concrete gets less workable (stiff) as the proportion increases, according to the workability data. The compressive strength results at 56 days revealed that 5% of WPPA exceeded the 56.56N/mm 2 design target mean strength, 10% of WPPA met the 50N/mm 2 designed target mean strength, and 15% and 20% of WPPA fell short of both the designed target mean strength and characteristic strength. SEM analysis showed that up to 5% WPPA maintains a dense microstructure and high strength in concrete, while higher WPPA levels result in increased porosity and reduced mechanical performance. In comparison to traditional HPC, 5% WPPA replacement of PLC would result in concrete that is stronger after a longer curing period.