The calcium-based solidification material enables us to expect the reduction of environmental burdens because it is near-neutral. We defined the concrete using this material as Calcium (Ca) concrete, and we have performed some experiments to investigate the properties of this concrete. From these results of previous experiments, we think that Ca concrete will be effective material on strength as a new civil engineering material. However, it is difficult to use steel as reinforcement material in Ca concrete due to near-neutral. Therefore, the bamboo is used as reinforcement material in this paper. And, the effect of bamboo as reinforcement material in Ca concrete is examined by investigating the fracture properties of Ca concrete reinforced by bamboo from four-point bending test. In particular, this investigation pays attention to the effect of the number of reinforcing bamboo. As a result, it becomes clear that the bending strength of Ca concrete with reinforcing bamboo is stronger than the strength of Ca concrete without reinforcing bamboo.
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