Bending Strength and Toughness Properties of Pavement Concrete Reinforced with Bamboo Fiber

抄録

The problems of neglected bamboo forest have been actualized in association with the aging of the people owning bamboo forest in recent years in Japan. Then it becomes imperative to establish the methods of effective utilization of the bamboo. Some bamboo has enough tensile strength as construction material, and studies and experiments on bamboo have been increasing gradually. The purposes of authors are to make short fiber of bamboo (“BF” for short) from Moso- bamboo, one of most popular bamboo in Japan, by ourselves, and to develop the concrete for pavement which matrix are reinforced with BF. A cross- linked effect between concrete surface on crack by BF had been expected as same as other kinds of short fibers. The purpose of this paper is to confirm the reinforcement effect by BF, and cement mortar was the object in order to simplify the experiments, in which the basic properties were investigated. The experiment factors are the amount of BF, water cement ratio, fiber length and distribution method of BF. These influence on compressive strength, bending strength and bending toughness was investigated experimentally. As the results, the followings were obtained. The strength does not increase only by a cross-linked effect by BF. The coefficient of toughness can be improved greatly by BF, and this effect is shown even in little quantity of fiber. Influence of water cement ratio on the toughness improvement is small. In case of random mixing of BF, each strength become lower without depending on fiber length, toughness coefficient can be improved. In case of spreading of BF, the strength and toughness coefficient can be improved even in little quantity of fiber.