Wu, Jia-Qi, Li, Bo, Chen, Yung-Tsang, Ghiassi, Bahman and Elamin, Ahmed ORCID: https://orcid.org/0000-0003-0783-5185 (2023) Effects of polyethylene fibre dosage and length on the properties of high-tensile-strength engineered geopolymer composite. Journal of Materials in Civil Engineering, 35 (8):04023224. ISSN 0899-1561 (Print), 1943-5533 (Online) (doi:10.1061/JMCEE7.MTENG-14763)

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Abstract

Engineered Geopolymer Composites (EGCs) have attracted increasing attention as an alternative to Engineered Cementitious Composites (ECCs) by using geopolymer to replace cementitious matrix in ECC, which improves the environmental sustainability by reducing the high cement and superplasticizer proportions. However, EGC generally needs a high temperature curing to enhance its early strength, and current EGCs with PVA fibre presents limited tensile performance. This paper aims to develop a high-tensile-strength EGCs reinforced by polyethylene (PE) fibre. The influence of fibre dosage (1.5%, 1.75% and 2.0%) and length (6 mm, 12 mm and 18 mm) on the engineering properties of EGC were examined. The results indicate that increasing either fibre dosage or length obviously decreases the flowability of EGC due to the skeleton formed by fibre. With the increase of fibre dosage, the compressive strength of the EGC with 12 mm fibre increases due to the enhanced fibre bridging effect, while that of the EGC with 18 mm fibre decreases due to the air entrapping effect. Consequently, the EGC with 2% of 6 mm or 12 mm fibre exhibit higher compressive strength than that with 18 mm fibre. The use of fibre at a high dosage (e.g., 2%) tends to cause the fibre cluster, which reduces the tensile strength of EGC, especially for the EGC with 18 mm fibre. A longer fibre length increases the tensile strength of EGC by enhancing the fibre-bridging effect. Increasing either fibre dosage or length is beneficial in improving the tensile strain capacity and crack control capacity of EGC. Besides, the fibre inclusion reduces the drying shrinkage of EGC through the restricting effect, although excessive fibre tends to introduce more voids and slightly increases their drying shrinkage. Furthermore, the environmental assessment indicates that PE fibre reinforced EGCs exhibit dramatically lower environmental impacts than the conventional M45 and high-tensile-strength ECCs.

Item Type:	Article
Uncontrolled Keywords:	engineered geopolymer composite; alkali activation; slag-fly ash blends; high tensile strain capacity; polyethylene fibre
Subjects:	Q Science > Q Science (General) T Technology > TA Engineering (General). Civil engineering (General)
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > School of Engineering (ENG)
Last Modified:	21 Jun 2023 15:37
URI:	http://gala.gre.ac.uk/id/eprint/42018

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