Manufacturing of Paving Blocks From Red Brick Waste And Water Treatment Sludge From Perumdam Tirta Wijaya Kabupaten Cilacap

Abstract

Construction waste such as broken red bricks and sludge from drinking water treatment is still an environmental problem that has not been used properly. This final project aims to recycle both types of waste into paving blocks as a way to support sustainable development and reduce environmental pollution. The research was carried out by mixing cement, sand, water, red brick waste, and water treatment sludge from PERUMDAM Tirta Wijaya Kabupaten Cilacap, with five different composition variations. The production process included mixing, molding, drying, curing, for 28 days, and testing the paving block quality based on the SNI 03-0691-1996 Paving Block standard. The parameters tested were compressive strength, water absorption, abrasion resistance, and resistance to sodium sulfate (Na₂SO₄). In addition, chemical analysis of the sludge was done using X-Ray Fluorescene (XRF) instrument. The results showed that the paving block with a composition of 75% red brick waste and 25% water treatment sludge from PERUMDAM Tirta Wijaya Kabupaten Cilacap had the best performance and met the D quality classification based on SNI 03-0691-1996 Paving Block, with a compressive strength of 10.54 MPa and water absorption of 8.81%.