Bidirectional Estimation of Self-Compacting Concrete Parameters Using Simplified Neuro-Fuzzy Networks

Bidirectional Approximation Neuro-Fuzzy Network Self-Compacting Concrete Workability Parameters

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The objective of this paper is to propose a novel bidirectional modeling framework using simplified neuro-fuzzy networks to approximate the complex dependencies between the workability parameters of self-compacting concrete (SCC) and the quantities of its five principal ingredients, namely cement, fly ash, water, additives, and admixtures. The forward model predicts seven key workability parameters based on the input ingredients and is essential for assessing the quality and performance of fresh SCC before production begins. In contrast, the backward model is trained to recommend the specific quantities of input ingredients required to achieve the expected SCC parameters. A comprehensive dataset consisting of 480 field-tested SCC mixtures was developed and used to train simplified Takagi–Sugeno–Kang (sTSK) networks. The numerical experiments demonstrated high accuracy, with the forward model achieving average relative errors of less than 2.46% and the backward model achieving an average relative error of 1.62%. These findings highlight the effectiveness of the proposed solutions in developing highly accurate approximation models. This study introduces a robust backward estimation approach, addressing a gap left by conventional forward-only models. Moreover, by incorporating Mahalanobis distance into the sTSK architecture, the proposed models use three times fewer nonlinear parameters than classical versions. This reduction enables their potential practical application in real-field concrete mixing and production systems for on-site quality control in production environments.