International Research Journal of Innovations in Engineering and Technology - IRJIET International Open Access, Monthly, Peer Reviewed, Reputed Journal ISSN (online): 2581-3048

Impact Factor (2025): 6.9

DOI Prefix: 10.47001/IRJIET

Performance Study of Construction and Demolition Waste as Coarse Aggregate on Strength and Cost-Effectiveness of Concrete

Abstract

Concrete, the most widely used construction material, is mainly composed of coarse aggregate, fine aggregate, binding material and water. Limited natural resources have been utilized over the years for producing aggregates in the construction industry. The rapidly increasing generation of construction and demolition waste (CDW) threatens the environment, especially for countries like Bangladesh where it has become more difficult to dispose of due to rapid urbanization. As a result, continuous research has been conducted on recycling CDW so that they can be used as partial replacement of conventional aggregates. The objective of this study was to analyze the strength characteristics and cost-effectiveness of concrete with the optimal replacement percentage of coarse aggregate. Compressive strength at 7, 14, and 28 days were determined experimentally by casting concrete cylinders using a mix ratio 1:1.5:3 and water-cement ratio of 0.50 by replacing 25%, 27.5%, 30%, 32.5%, and 35% natural coarse aggregate with construction and demolition waste coarse aggregate (CDWCA). The test results suggested that the compressive strength increased for replacement of up to 30% coarse aggregate. It was also observed that strength and cost comparison was compatible for 27.5%, 30% and 32.5% of CDWCA replacing natural coarse aggregate; however, 30% CDWCA replacement yielded the optimal mix, balancing both cost reduction and compressive strength improvement. Aggregates manufactured from CDW can be utilized as recycled concrete aggregates to replace conventional aggregates for non-structural works with proper guidelines.

Country : Bangladesh

1 Most. Sonia Aktar2 Md. Sultanul Islam3 Syria Mostak

  1. Lecturer, Department of Civil Engineering, Presidency University, Dhaka, Bangladesh
  2. Associate Professor, Department of Civil Engineering, Uttara University, Dhaka, Bangladesh
  3. Lecturer, Department of Civil Engineering, Presidency University, Dhaka, Bangladesh

IRJIET, Volume 8, Issue 12, December 2024 pp. 53-59

doi.org/10.47001/IRJIET/2024.812009

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