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A laboratory study of high-performance cold mix asphalt mixtures reinforced with natural and synthetic fibres

Shanbara, HK, Ruddock, F and Atherton, W (2018) A laboratory study of high-performance cold mix asphalt mixtures reinforced with natural and synthetic fibres. Construction and Building Materials, 172. pp. 166-175. ISSN 0950-0618

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Abstract

This research aims to examine the impact of using natural and synthetic fibres as reinforcing materials, on the mechanical properties and water susceptibility of cold mix asphalt (CMA) including indirect tensile stiffness and resistance to rutting, cracking and moisture damage. Four different types of fibres were used: glass as a synthetic fibre, and hemp, jute and coir as natural fibres. Various samples of CMA, with and without fibres, were fabricated and tested. Traditional hot mix asphalt (HMA) was also used for comparison. The results indi cate a significant improvement in the indirect tensile stiffness modulus, for all fibre-reinforced CMA mixtures, over different curing times. The improved tensile behaviour represents a substantial contribution towards slowing crack propagation in bituminous mixtures, while scanning electron microscopy analysis confirmed the fibre shape and surface roughness characteristics. The improved performance of the reinforced mixtures with both natural and synthetic fibres, facilitated a substantially lower permanent deformation than traditional hot and cold mixtures at two different temperatures (45 °C and 60 °C). When using glass and hemp fibres as reinforcing materials, there was a significant improvement in CMA in terms of water sensitivity. Resistance to surface cracking was also improved when fibres were incorporated. Based on the test results, 0.35% fibre content by mass of dry aggregate and 14 mm fibre length are recommended to achieve the optimum performance output for indirect tensile stiffness. © 2018 Elsevier Ltd

Item Type: Article
Uncontrolled Keywords: 0905 Civil Engineering, 1202 Building
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Civil Engineering
Publisher: Elsevier
Date Deposited: 06 Apr 2018 11:04
Last Modified: 12 Oct 2018 12:20
DOI or Identification number: 10.1016/j.conbuildmat.2018.03.252
URI: http://researchonline.ljmu.ac.uk/id/eprint/8424

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