Title: Flexural Behavior of Micro Fiber Reinforced Cement Composites
Author(s): P. Balaguru
Publication: Symposium Paper
Appears on pages(s): 11-24
Keywords: cements; composite materials; ductility; sands; shotcrete; fiber reinforced concretes; fibers; flexural strength; microfibers; placing; silica fume; strength; Materials Research
Results of an experimental investigation on the behavior of a cement composite reinforced with short (micro) fibers are presented. The primary response variable was flexural behavior measured in terms of modulus of rupture and toughness index. The independent variables were fiber content, addition of silica fume, cement, sand ratio, specimen size, and casting procedure. Most of the specimens were cast using a shotcreting process. The results indicate the following trends. The microfibers can be used to increase flexural strength in rich cement mortars. The fibers do not provide significant strength increase, but do provide improved ductility. The addition of silica fume improves the fiber performance. Fibers are more effective in thinner sections. The author believes that the properties of the composite can be considerably improved by removing the excess water and entrapped air by applying external pressure during the manufacturing process.