2019 CSCE Annual Conference - Laval (Greater Montreal)

2019 CSCE Annual Conference - Laval (Greater Montreal) Conference

Permeability Characteristics of Cementitious Materials Reinforced with Kraft Pulp Fibres

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Dr. Emad Booya, University of Windsor (Presenter)
Ms. Karla Gorospe, University of Windsor
Mr. Adeyemi Adesina, University of Windsor
Dr. Sreekanta Das, University of Windsor

The research on the application of environmentally friendly materials in construction has been increasing. Special attention has been given on the use of fibers originating from renewable vegetable sources such as cellulose pulp fiber. These fibers are green alternatives to conventional synthetic and other petrochemical based fibers. Cellulose fibers are promising reinforcing materials because of their availability, renewability, recyclability, and nonhazardous nature.

One of the well-known problems of concrete is degradation caused by the penetration of deleterious substances into the concretes by transport and diffusion. The inclusion of cellulose fiber is expected to potentially mitigate damages such as corrosion and spalling in cementitious materials by enhancing the microstructural permeable pores caused by the ingress of water and chlorides. Hence, this study was completed to determine the strength and permeability properties of cementitious materials reinforced with engineered Kraft pulp fibers. These fibers are called mechanically modified fiber (MMF) and chemically treated fibers (CTF). The performance of reinforced mixtures made of these two fibers were compared with a mixture made of traditional and commercially available unmodified (UF) pulp fiber. The MMF and CTF are proprietary to Domtar Inc. and to the best of the authors’ knowledge, they have not been used in any previous studies in fiber reinforced cement composites applications. The strength, and durability of fiber-reinforced concretes were assessed for compressive strength, chloride permeability, immersion absorption, and rate of absorption. Test results showed an increase in the permeability characteristics for the reinforced concretes. Hence, these fibres reduced the compressive strength and durability of reinforced concretes as compare to the unreinforced concrete. However, the two engineered fibres performed better than the unmodified fibre in terms of compressive strength, chloride ion permeability and water sorptivity. The study concludes that these two engineered pulp fibers are better alternatives to commercially available unmodified cellulose fibers.