Impermeability Durability of SCC Reinforced with Fibrillated Polypropylene Fiber
X.B. He*, 1, Y. Li1, Q. Shen2
Identifiers and Pagination:Year: 2015
First Page: 159
Last Page: 166
Publisher Id: TOCIEJ-9-159
Article History:Received Date: 17/9/2014
Revision Received Date: 17/12/2014
Acceptance Date: 23/12/2014
Electronic publication date: 17/4/2015
Collection year: 2015
open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
The paper studied the influences of the volume content and slenderness ratio of fibrillated polypropylene fiber on the impermeability durability of self-consolidating concrete (SCC) reinforced with the fibrillated polypropylene fiber, and proposed to use the modified relative permeability coefficient method to evaluate the water-resistant properties of SCC reinforced with the fiber. Also, the influence mechanism of the fiber on the permeability of the concrete has been analyzed according to the mercury injection test, scanning electronic microscope (SEM) observation and the basic principles of fracture mechanics. Results showed that: 1) the total porosity of SCC gradually increased with the increase in the fiber content; 2) the harmful porosity of SCC decreased firstly and then increased with the increase in the fiber content, while the harmful porosity increased with the increase in the fiber length; 3) when the reference mix proportion of SCC was kept constant, the fiber volume content was not more than 0.10 %, and the appropriate fiber length ranged from 12 to 15mm; 4) when the volume content is no more than 0.15%, the hardened SCC reinforced with fibrillated polypropylene fiber possessed good water impermeability gradation (＞P12); the splitting strength and flexural tensile strength of the hardened SCC reinforced with fibrillated polypropylene fiber increased with the addition of the fiber content; the relative water penetration coefficient of the hardened SCC reinforced with fibrillated polypropylene fiber decreased with the addition of the fiber content firstly and then increased; the Coulomb value first increased smoothly (the maximum Coulomb value is less than 2000C, and low according to JTJ/T 193-2009 and ASTM C 1202), and then increased sharply.