Prediction of Compressive Strength of Concrete: Critical Comparison of Performance of a Hybrid Machine Learning Model with Standalone Models
The use of machine learning (ML) techniques to model quantitative composition-property relationships in concrete has received substantial attention in the past few years. This paper presents a novel hybrid ML model (RF-FFA) for prediction of compressive strength of concrete by combining the random forests (RF) model with the firefly algorithm (FFA). The firefly algorithm is utilized to determine optimum values of two hyper-parameters (i.e., number of trees and number of leaves per tree in the forest) of the RF model in relation to the nature and volume of the dataset. The RF-FFA model was trained to develop correlations between input variables and output of two different categories of datasets; such correlations were subsequently leveraged by the model to make predictions in previously untrained data domains. The first category included two separate datasets featuring highly nonlinear and periodic relationship between input variables and output, as given by trigonometric functions. The second category included two real-world datasets, composed of mixture design variables of concretes as inputs and their age-dependent compressive strengths as outputs. The prediction performance of the hybrid RF-FFA model was benchmarked against commonly used standalone ML models - support vector machine (SVM), multilayer perceptron artificial neural network (MLP-ANN), M5Prime model tree algorithm (M5P), and RF. The metrics used for evaluation of prediction accuracy included five different statistical parameters as well as a composite performance index (CPI). Results show that the hybrid RF-FFA model consistently outperforms the standalone ML models in terms of prediction accuracy - regardless of the nature and volume of datasets.
R. Cook et al., "Prediction of Compressive Strength of Concrete: Critical Comparison of Performance of a Hybrid Machine Learning Model with Standalone Models," Journal of Materials in Civil Engineering, vol. 31, no. 11, American Society of Civil Engineers (ASCE), Nov 2019.
The definitive version is available at https://doi.org/10.1061/(ASCE)MT.1943-5533.0002902
Civil, Architectural and Environmental Engineering
Materials Science and Engineering
INSPIRE - University Transportation Center
Second Research Center/Lab
Center for Research in Energy and Environment (CREE)
Keywords and Phrases
Compressive Strength; Concrete; Firefly Algorithm; Machine Learning; Random Forests
International Standard Serial Number (ISSN)
Article - Journal
© 2019 American Society of Civil Engineers (ASCE), All rights reserved.
01 Nov 2019