Effect of macro-synthetic fibers on the fracture energy and mechanical behavior of recycled aggregate concrete

Kazmi, S, Munir, M, Wu, Y and Patnaikuni, I 2018, 'Effect of macro-synthetic fibers on the fracture energy and mechanical behavior of recycled aggregate concrete', Construction and building materials, vol. 189, no. 2018, pp. 857-868.


Document type: Journal Article
Collection: Journal Articles

Title Effect of macro-synthetic fibers on the fracture energy and mechanical behavior of recycled aggregate concrete
Author(s) Kazmi, S
Munir, M
Wu, Y
Patnaikuni, I
Year 2018
Journal name Construction and building materials
Volume number 189
Issue number 2018
Start page 857
End page 868
Total pages 12
Publisher Elsevier
Abstract In order to achieve sustainability in construction industry, recycling of construction and demolition wastes in new concrete is gaining a lot of attention. However, extensive research is needed to explore the complete behavior of resulting recycled aggregate concrete (RAC). This study aims to investigate the fracture behavior, mechanical performance and microstructure of macro-synthetic fiber reinforced RAC. For this purpose, notched beam specimens were produced using three different replacement ratios of recycled concrete aggregates (RCA) (i.e., 0, 50% and 100%) and three different dosages of macro synthetic fibers (i.e., 0, 0.5% and 1% of volume of RAC). Three-point bending and other mechanical tests were performed to investigate the post peak behavior (residual flexural tensile strength, fracture energy and toughness) and mechanical properties (compressive strength, flexural strength and split tensile strength) of macro-synthetic fiber reinforced normal and RAC. Fracture surface analysis was also performed to develop the empirical relationships between number of fibers and post peak behavior of fiber reinforced RAC. Furthermore, microstructure characteristics of macro-synthetic fiber reinforced normal and RAC were also investigated using scanning electron microscopy (SEM). Results showed that reduction in mechanical properties of concrete was observed with the increase in RCA replacement ratio. However, increase in mechanical properties particularly split tensile strength of normal and RAC was observed with the increase in dosage of macro-synthetic fibers. Concrete specimens also showed increase in residual flexural tensile strengths with the increase in dosage of macro-synthetic fibers. RAC reinforced with 1% dosage of macro-synthetic fibers showed increase in fracture energy and toughness by 380% and 129%, respectively. A strong influence of number of fibers on residual flexural tensile strength and fracture energy of concrete mixtures was observed during the s
Subject Construction Materials
Keyword(s) Recycled concrete aggregates (RCA)
Macro-synthetic fibers
Fiber-reinforced concrete
Fracture energy
Crack mouth opening displacement (CMOD)
Mechanical properties
Microstructure
DOI - identifier 10.1016/j.conbuildmat.2018.08.161
Copyright notice © 2018 Published by Elsevier Ltd.
ISSN 0950-0618
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