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Materials 2019, 12(8), 1196; https://doi.org/10.3390/ma12081196

Laboratory Investigation on the Shrinkage Cracking of Waste Fiber-Reinforced Recycled Aggregate Concrete

1
School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China
2
School of Material Science and Engineering, Shenyang Jianzhu University, Shenyang 110168, China
3
School of Foreign Languages, Shenyang Jianzhu University, Shenyang 110168, China
*
Author to whom correspondence should be addressed.
Received: 12 March 2019 / Revised: 31 March 2019 / Accepted: 8 April 2019 / Published: 12 April 2019
(This article belongs to the Special Issue Environmentally Friendly Renewable Materials)
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Abstract

This paper aims to study the effectiveness of adding waste polypropylene fibers into recycled aggregate concrete (RAC) on shrinkage cracking. The influences of fiber properties (length and content) on the shrinkage performance of RAC are investigated. Firstly, through the plat-ring-type shrinkage test and free shrinkage test, both of the early age and long-term shrinkage performance of waste fiber recycled concrete (WFRC) were measured. Then, X-ray industrial computed tomography (ICT) was carried out to reflect the internal porosity changes of RAC with different lengths and contents of fibers. Furthermore, the compressive strength and flexural strength tests are conducted to evaluate the mechanical performance. The test results indicated that the addition of waste fibers played an important role in improving the crack resistance performance of the investigated RAC specimens as well as controlling their shrinkage behaviour. The initial cracking time, amount and width of cracks and shrinkage rate of fiber-reinforced specimens were better than those of the non-fiber-reinforced specimen. The addition of waste fibers at a small volume fraction in recycled concrete had not obviously changed the porosity, but it changed the law of pore size distribution. Meanwhile, the addition of waste fibers had no significant effect on the compressive strength of RAC, but it enhanced the flexural strength by 43%. The specimens reinforced by 19-mm and 0.12% (volume fraction) waste fibers had the optimal performance of cracking resistance. View Full-Text
Keywords: recycled aggregate concrete (RAC); waste fiber reinforced; shrinkage cracking; X-ray industrial computed tomography (ICT); mechanical properties recycled aggregate concrete (RAC); waste fiber reinforced; shrinkage cracking; X-ray industrial computed tomography (ICT); mechanical properties
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wu, X.; Zhou, J.; Kang, T.; Wang, F.; Ding, X.; Wang, S. Laboratory Investigation on the Shrinkage Cracking of Waste Fiber-Reinforced Recycled Aggregate Concrete. Materials 2019, 12, 1196.

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