International Journal of Advanced Engineering Application

Mechanical and Durability Performance of Recycled Coarse Aggregate Concrete Modified with Class-F Fly Ash for M50-Grade Pavement Applications

Author(s):Suresh M. Patil, Anushka R. Borkar, Devanshu N. Choudhary

Affiliation: Dept. of Civil Engineering, Smt. Radhikatai Pandav College of Engineering, Nagpur, Maharashtra, India

Page No: 9-12

Volume issue & Publishing Year: Volume 3, Issue 5, 2026/05/01

Journal: International Journal of Advanced Engineering Application (IJAEA)

ISSN NO: 3048-6807

DOI: https://doi.org/10.5281/zenodo.20025517

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Abstract:
India generates roughly 150 million tonnes of construction & demolition (C&D) waste annually, of which less than 1 % is currently recycled into structural concrete. This study examines the suitability of recycled coarse aggregate (RCA) — sourced from demolished low-rise residential buildings in Buldhana district — as a partial replacement (0, 25, 50, 75, 100 %) for natural coarse aggregate in M50-grade pavement-quality concrete. Class-F fly ash from the Koradi thermal power station was incorporated at 0, 10, 20 and 30 % of the binder mass. Twenty mix proportions were cast and tested for compressive strength (3, 7, 28, 56, 90 d), water absorption, slump, hardened density and chloride permeability. The 50 % RCA + 20 % fly ash mix attained 36.2 MPa at 28 days (89 % of the control), reduced cement consumption by 20 %, embodied CO₂ by 17 %, and material cost by ₹680 per cubic metre. A four-parameter multiple-linear regression model with R² = 0.925 is proposed to assist site engineers in predicting strength.

Keywords: Recycled coarse aggregate; Class-F fly ash; Pavement-quality concrete; Sustainable construction; Multiple-linear regression

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