{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,28]],"date-time":"2026-04-28T17:56:29Z","timestamp":1777398989586,"version":"3.51.4"},"reference-count":191,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2026,1,29]],"date-time":"2026-01-29T00:00:00Z","timestamp":1769644800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Buildings"],"abstract":"<jats:p>Machine learning (ML) has become an increasingly important tool in concrete engineering which has significantly altered the method of prediction and optimization of concrete properties, enabling more efficient, accurate, and sustainable processes. However, the inherent variability of concrete is a significant challenge to the generalization and performance of ML models. This study is a review that explores the effect of the variability of concrete material on the reliability and accuracy of predictions by ML. To explain the influence of these sources of variability on mechanical and durability related behaviors, the paper groups the sources of variability into four major groups, namely composition, microstructure, curing conditions, and environmental factors. A broad range of machine learning paradigms\u2014including supervised learning, unsupervised learning, reinforcement learning (RL), and hybrid physics-informed approaches\u2014is examined with respect to their robustness against data heterogeneity and distributional shifts. The weaknesses and advantages of the two types of algorithms are highlighted with regard to forecasting fresh and hardened concrete properties and the optimization of the mix design. Based on this synthesis, the review identifies key unresolved challenges, including the lack of standardized multi-source datasets, limited transferability of models across experimental settings, and insufficient reporting of preprocessing and normalization practices.<\/jats:p>","DOI":"10.3390\/buildings16030556","type":"journal-article","created":{"date-parts":[[2026,1,29]],"date-time":"2026-01-29T10:56:34Z","timestamp":1769684194000},"page":"556","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Concrete Material Variability and Machine Learning Model Performance: A Comprehensive Review"],"prefix":"10.3390","volume":"16","author":[{"given":"Hadi","family":"Bahmani","sequence":"first","affiliation":[{"name":"Department of Civil Engineering, Shahrekord University, Shahrekord 88186-34141, Iran"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0364-4552","authenticated-orcid":false,"given":"Hasan","family":"Mostafaei","sequence":"additional","affiliation":[{"name":"School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0134-6762","authenticated-orcid":false,"given":"Paulo","family":"Santos","sequence":"additional","affiliation":[{"name":"University of Coimbra, ISISE, ARISE, Department of Civil Engineering, 3030-788 Coimbra, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3842-547X","authenticated-orcid":false,"given":"Daniel","family":"Ferr\u00e1ndez","sequence":"additional","affiliation":[{"name":"Departamento de Tecnolog\u00eda de la Edificaci\u00f3n, Universidad Polit\u00e9cnica de Madrid, Avda Juan de Herrera, 6, 28040 Madrid, Spain"}]}],"member":"1968","published-online":{"date-parts":[[2026,1,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"105439","DOI":"10.1016\/j.istruc.2023.105439","article-title":"Fully automated operational modal identification of regular and irregular buildings with ensemble learning","volume":"58","author":"Mostafaei","year":"2023","journal-title":"Structures"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Mostafaei, H., and Ghamami, M. 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