レジンコンクリートはりの力学的特性

抄録

Many studies on resin concrete (REC) have been made so far, and now more detailed investigations for use of REC as structural members are gradually becoming important.
The objective of this study was to obtain the mechanical properties of REC structural members, especially in relation to the following two points: (1) effectiveness of using low shrinkage resin or glass fiber rod (GF) having low modulus of elasticity in order to decrease internal tensile stress due to shrinkage restriction of reinforcing bar, (2) improvement of cracking moment and ultimate moment of REC beam by using low shrinkage resin or glass fiber.
The results showed that in normal type REC beams with GF the internal tensile stress decreased, preventing a reduction in cracking moment. In addition, bonding between GF and REC was good, and therefore high strength of GF could be used effectively. But GF beams showed some brittleness in cracking behaviors and deformation.
On the other hand, low shrinkage resin concrete beams with SBPD were superior because of their low internal tensile stress, good bonding property, high cracking and ultimate moments. But beams of this type had similar brittleness in deformation behaviors.
These features were considered due to characteristics of REC having high strength but low ductility. So, allowance should be made in using REC beam for service load or safety factor corresponding to the purposes and places for the members to be used in service.