Workability and Compressive Strength of Recycled Concrete Waste Aggregate Concrete

Abstract:

Concrete waste from construction site such as pile waste and tested concrete cubes waste is quite a problem for the contractor to dispose of. This waste is currently being buried or dumped illegally at a certain area, which lead to environmental pollution issue and waste of construction materials. In this study, concrete cubes waste from a concrete testing laboratory is crushed and recycled as natural coarse aggregate (NA) replacement (0% - control, 30% and 50% by mass) in grade 15, 25 and 40 concrete. The recycled concrete waste aggregate (RCWA) was tested for grading, specific gravity, percent absorption and impact and crushing (% crushed). For the fresh concrete mix, slump and compaction factor test were carried out. Concrete samples are wet cured and tested at 7 and 28 days for compressive strength. Results show that the workability of RCWA concrete reduce as the content of RCWA increase in the mix as the water absorption of RCWA is higher than the NA. The compressive strength of the RCWA concrete is acceptable at all RCWA replacement for grade 15 and 25 concrete with strengths higher than the design values of 15 and 25 MPa. For grade 40 concrete, the optimum RCWA replacement is at 30% and at 50% replacement, the compressive strength of the RCWA concrete is lower than the design value of 40 MPa. 50% replacement of NA with RCWA works well for grade 15 and 25 concrete, but for higher concrete grade (C40), the limiting value of replacement is 30%.

• Periodical: Applied Mechanics and Materials (Volumes 754-755)
• Pages: 417-420
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.754-755.417
• Online since: April 2015
• Authors: Rashid Ali, Roszilah Hamid
• Keywords: Compressive Strength, Recycled Concrete Waste Aggregate, Water Absorption

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