City Research Online

Abstract

Due to the scarcity of natural sand resources and the abundance of volcanic scoria sand, volcanic scoria sand concrete is becoming increasingly popular. Therefore, this paper aims to study the mix proportion of new sustainable steel fiber reinforced volcanic scoria sand concrete (SFVSSC). Response surface methodology (RSM) was used to design the mix proportion according to the recommendations of EFNARC 2005 using the proportion of water-to-cement ratio (w/c) (0.35, 0.4, and 0.45), the volcanic scoria sand replacement rate (Rvs) (25, 50, and 75%), and steel fiber volume content (Vsf) (0.5, 1, and 1.5%) as input variables. To assess the workability and mechanical properties of SFVSSC using RSM, slump, thermal conductivity, specific strength, compressive strength, and splitting tensile strength were determined. The results show that the quadratic polynomial regression equation can be used to predict the effect of different composition factors on the performance of SFVSSC with high accuracy and confidence. In addition, stress–strain curves were obtained for mixtures with different Rvs and Vsf. Finally, multi-objective optimization produced optimal mix proportions for SFVSSC: w/c of 0.35, Rvs of 52.8%, and Vsf of 1.15%. The optimization results were verified experimentally, and the absolute value of the relative error between the predicted and tested strength values was less than 5%. This paper shows that it is feasible to use SFVSSC and suggests the potential application of RSM in concrete proportioning.

Publication Type:	Article
Additional Information:	This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Publisher Keywords:	Volcanic scoria, Steel fiber, Mix proportion, Response surface methodology, Multi-objective optimization
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TH Building construction
Departments:	School of Science & Technology School of Science & Technology > Department of Engineering
SWORD Depositor:	Symplectic Administrator

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