Akhmad Suryadi, Taufiq Rochman
The utilization of Autoclaved Aerated Concrete (AAC), also known as lightweight Hebel brick, is increasingly prevalent in diverse construction endeavors. In practical application, the accumulation of unused lightweight bricks can result in substantial quantities of construction solid waste, thereby exerting a notable environmental impact. The objective of this research is to examine the impact of incorporating varying proportions (0%, 15%, 25%, 30%) of lightweight brick waste into fine aggregate materials, specifically silica fume, with cement in conventional concrete mixtures. The present study employs the cast in-situ method utilizing a concrete mixer. The concrete specimen, measuring 15x15x15cm, was in the geometric shape of a cube and underwent a curing process for durations of 7, 14, and 28 days prior to conducting the compressive strength test. A total of 120 cube specimens were utilized for testing purposes, while the concrete mix will adhere to the guidelines outlined in SNI 03-2834-2000. Based on the findings of a specific study, it was observed that the average compressive strength achieved after 28 days varied when incorporating different proportions (0%, 15%, 25%, 30%) of lightweight brick waste, without the inclusion of silica fume. The recorded values were 30.10 MPa, 25.15 MPa, 20.48 MPa, and 17.48 MPa, respectively. The compressive strength of concrete mixtures containing varying percentages (0%, 15%, 25%, 30%) of lightweight brick waste, along with the inclusion of 10% silica fume, was determined. The average compressive strengths obtained were 32.12 MPa, 28.60 MPa, 23.80 MPa, and 23.79 MPa, respectively. The experimental findings indicate that the incorporation of lightweight brick waste in concrete leads to a reduction in compressive strength. However, the addition of silica fume to the concrete mixture resulted in a relatively minor decrease in compressive strength. The percentage range observed at the age of 28 days was between 4.96% and 20.97%. © 2024 by authors, all rights reserved.
Department of Civil Engineering, State Polytechnic of Malang, Indonesia; Structural Engineering and Head of Structural Engineering Laboratory, State Polytechnic of Malang, Indonesia