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Materials 2016, 9(3), 131; doi:10.3390/ma9030131

Effectiveness of Fiber Reinforcement on the Mechanical Properties and Shrinkage Cracking of Recycled Fine Aggregate Concrete

1
Structure Engineering Research Center, Tokyo Institute of Technology, Yokohama 226-8503, Japan
2
Department of Architectural Engineering, Chungnam National University, Daejeon 34134, Korea
3
Graduate School of Engineering, Muroran Institute of Technology, Muroran 050-8585, Japan
4
Offshore Plant Research Division, Korea Research Institute of Ship and Ocean Engineering, Daejeon 34103, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Prabir Sarker
Received: 10 October 2015 / Revised: 14 February 2016 / Accepted: 18 February 2016 / Published: 26 February 2016
(This article belongs to the Special Issue Utilisation of By-Product Materials in Concrete)
View Full-Text   |   Download PDF [6956 KB, uploaded 26 February 2016]   |  

Abstract

This paper presents an experimental study conducted to investigate the effect of fiber reinforcement on the mechanical properties and shrinkage cracking of recycled fine aggregate concrete (RFAC) with two types of fiber—polyvinyl alcohol (PVA) and nylon. A small fiber volume fraction, such as 0.05% or 0.1%, in RFAC with polyvinyl alcohol or nylon fibers was used for optimum efficiency in minimum quantity. Additionally, to make a comparative evaluation of the mechanical properties and shrinkage cracking, we examined natural fine aggregate concrete as well. The test results revealed that the addition of fibers and fine aggregates plays an important role in improving the mechanical performance of the investigated concrete specimens as well as controlling their cracking behavior. The mechanical properties such as compressive strength, splitting tensile strength, and flexural strength of fiber-reinforced RFAC were slightly better than those of non-fiber-reinforced RFAC. The shrinkage cracking behavior was examined using plat-ring-type and slab-type tests. The fiber-reinforced RFAC showed a greater reduction in the surface cracks than non-fiber-reinforced concrete. The addition of fibers at a small volume fraction in RFAC is more effective for drying shrinkage cracks than for improving mechanical performance. View Full-Text
Keywords: recycled fine aggregate; fiber-reinforced concrete (FRC); small fiber volume fractions; mechanical properties; shrinkage cracking recycled fine aggregate; fiber-reinforced concrete (FRC); small fiber volume fractions; mechanical properties; shrinkage cracking
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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MDPI and ACS Style

Nam, J.; Kim, G.; Yoo, J.; Choe, G.; Kim, H.; Choi, H.; Kim, Y. Effectiveness of Fiber Reinforcement on the Mechanical Properties and Shrinkage Cracking of Recycled Fine Aggregate Concrete. Materials 2016, 9, 131.

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