Title: Predicting compressive strength of recycled aggregate concrete using natural aggregate concrete compressive strength and material proportions

Authors: Wasfi Diab; Ghoson Danhash

Addresses: Albaath University, Homs, Syria ' Albaath University, Homs, Syria; Wadi International University, Homs, Syria

Abstract: This research aims to find an empirical relationship to predict the compressive strength of recycled aggregate concrete at 28 days and another one for different ages based on a set of variables; with different wide ranges of the parameters. An experimental database from 40 previous research studies was created, containing 435 results, to propose an empirical relationship for predicting the compressive strength of recycled aggregate concrete. For verifying the proposed relationships, two groups of mixes were designed: the first one with a constant plasticiser ratio and the second one with a variable plasticiser ratio, and each group contains five concrete mixes using recycled aggregates with replacement ratios of 0%, 25%, 50%, 75%, and 100% to conduct a compression test and compare the experimental results with those obtained from the proposed relationships. The efficiency of the suggested relationships is proven by the good concordance between the empirical and experimental data.

Keywords: compressive strength; recycled aggregate concrete; RAC; replacement ratio; water/cement ratio; plasticiser.

DOI: 10.1504/IJMRI.2026.150369

International Journal of Masonry Research and Innovation, 2026 Vol.11 No.1, pp.1 - 19

Received: 18 Sep 2023
Accepted: 17 Nov 2023
Published online: 12 Dec 2025 *

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