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Development of Response Surface Models for Strength and Flow Characteristics of PET Fibre-Reinforced Self-Compacting Laterized Concrete Containing Fly Ash

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Abstract:

This study looked into the economic production of self-compacting concrete (SCC) using affordable and locally available materials such as fly ash (FA), laterites (LA), and polyethylene terephthalate (PET) fibres. To achieve optimal properties of SCC, Response Surface Methodology (RSM) - Central Composite Design (CCD) was employed. Thus, twenty different SCC mixes were designed with varying input factor combinations (FA: 0–40%, LA: 0-50%, and PET fibre: 0–2%) and tested for six responses (rheological properties, namely slump flow, V-funnel time, and L-Box; and mechanical properties, namely compressive, split-tensile, and flexural strengths test). Mathematical models were created in response to the experimental results and assessed using analysis of variance (ANOVA) test. L-Box, V-funnel, and Slump flow test results showed that while fly ash may improve the flowability of SCC, inclusion of high volume of PET-fibres (above 1%) and laterite (above 25%), has high negative impact on SCC flowability. The results further revealed that inclusion of PET-fibres in SCC largely improves the flexural strength (FS) and split tensile strength (STS) by about 20%. However, high volume of laterite contributes negatively to the strength values. Although SCC’s compressive strength decreased with addition of each or a combination of the three different materials, a combination of 20% fly ash, 25% laterite and 1% PET-fibres can result in strength values that are comparative to that of the control mix. The RSM models developed showed relatively good predictive capabilities especially for the compressive strength, L-box and V-funnel models with adjusted R2 values ranging between 0.8 – 0.9. Among all the combinations, it is recommended that 20% FA, 25% LA, and 1% PET fibres be adopted in production of sustainable and cost-effective self-compacting concrete, as it gave relatively stable characteristics compared to the control mix in terms of the strength and rheological properties.

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Periodical:

Materials Science Forum (Volume 1161)

Pages:

137-153

DOI:

https://doi.org/10.4028/p-Ierty7

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Online since:

October 2025

Authors:

Moses Adetutu*, Chinwuba Arum, Oluwafemi Omotayo, Stephen Alabi

Keywords:

Fly Ash (FA), Laterites (LA), Polyethylene Terephthalate (PET), Response Surface Methodology (RSM), Self-Compacting Concrete (SCC)

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© 2025 Trans Tech Publications Ltd. All Rights Reserved

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