Mechanical properties and Durability of Bamboo-Fiber-Mixed Spray Mortar for Slope Protection

Abstract

Expecting improvement of resistance against cracking and durability, short fibers such as steel fibers and organic fibers have been mixed into spray mortar for slope protection. On the other hand, in order to promote proper management of bamboo forests, it is necessary to develop effective application of bamboo materials. For these reasons, in this research, the tensile strength and the bond strength of a bamboo fiber used for spray mortar were investigated by laboratory experiments. After that, the mechanical properties, under the cyclic wet and dry condition and the resistance against freezing and thawing of spray mortar containing bamboo fibers were examined by spraying experiment. As a result, it was confirmed that mixing of bamboo fibers as 0.75% improved mechanical properties and durability of spray mortar, such as flexural toughness, adhesion strength to the base surface after cyclic wet and dry, and resistance against freezing and thawing. In addition, higher flexural toughness and adhesion strength to the base surface were obtained by mixing both of bamboo fibers and vinylon fibers or by admixing of fly ash.