Effectiveness of chemical treatment on polypropylene fibers as reinforcement in pervious concrete. (28th February 2018)

• Record Type: Journal Article
• Authors: Akand, Lutfur; Yang, Mijia; Wang, Xinnan
• Is Part Of: Construction & building materials. Volume 163(2018)
• Page Start: 32
• Page End: 39
• Publication Date: 2018-02-28
• Subjects: Chemical treatment -- Polypropylene fibers -- Fiber reinforcement -- Pervious concrete -- Flexural strength -- Compressive strength; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2017.12.068
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Chemically treated fibers have shown higher bond strength with the concrete matrix. Fiber reinforcement did improve the compressive strength of pervious concrete. Fiber-matrix interface behavior in pervious concrete is characterized experimentally. The affected zone of each fiber in pervious concrete is less. Abstract: Fiber reinforcement delays the crack generation and enhances the strength of the host matrix. However, the bonding mechanism between fiber and concrete matrix is controversial in literature and needs better explanation. Due to surface smoothness and inert chemical nature of commercially available fibers, several mechanical and chemical treatment techniques have been studied by researchers to increase the fiber-matrix bonding properties. The use of fibers in pervious concrete is even more challenging due to high porosity and insufficient fiber-matrix bonding interface. This study discusses the effect of chemical treatment on short polypropylene fibers and its uses in pervious concrete as reinforcement. The change in fiber surface due to the treatment is determined through fiber wettability test and Atomic Force Microscopy (AFM). Changes on the tensile strength of fibers by the treatment methods are also tabulated. Single fiber pullout tests are conducted to study the effect of the treatment type on fiber-cement interface properties. Treated fibers are then put into pervious concrete matrix for compressive and flexural strength tests. Chemical treatments are found to improve the surface roughness and cement matrix interface properties, as well as to enhance the overall strength of the fiber reinforced pervious concrete.