City Research Online

Abstract

In this paper, the strengthening mechanism of different dosage and length of carbon fiber, sisal fiber and polypropylene fiber on the microstructures and mechanical properties of Coral Concrete was studied through mechanical tests and microstructure analysis using Scanning Electron Microscope (SEM). Based on the mechanical tests and analysis of the microstructure, the strengthening effect and strengthening mechanism of fiber in coral concrete, as well as the mechanical properties of cementitious coral concrete were investigated. The results show that compared to normal mortar, the workability of the coral concrete is poor due to its light weight, high porous and rough surface, making the evenly dispersion of fibers in the concrete difficult, therefore, reduces the strengthening effect the fibers. However, the addition of fibers can significantly enhance the flexural strength and toughness of the coral concrete, improve the mechanical properties of coral concrete, but excessive high fiber dosage and extra-long fiber will significantly reduce the working performance of coral concrete, due to the fiber curling and clustering, especially for carbon fiber. In addition, the optimal length and content of different types of fiber are investigated. It is also found that, the strengthening effect of sisal fiber is better than polypropylene fiber and carbon fiber.

Publication Type:	Article
Additional Information:	The final and definitive version of this manuscript has been accepted for publication in: Proceedings of the ICE - Civil Engineering © 2020; all rights reserved, ICE Publishing.
Publisher Keywords:	Concrete structures, Composite structures, Failure ,Coral concrete; Mechanical properties; Microstructure; Scanning Electron Microscope; strengthening effect; fiber
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Departments:	School of Science & Technology > Engineering
SWORD Depositor:	Symplectic Administrator

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