Thermal Properties and Temperature Dependence of Mechanical Properties of Resin Concretes for Structural Use

摘要

hydrates in ordinary cement concrete. For the structual use of the resin concrete, the thermal and temperature-dependent mechanical properties of REC_s were experimentally examined. REC_s with various resin contents were prepared by using two kinds of unsaturated polyester resins and two kinds of epoxy resins with different heat distortion temperatures (HDT) and glass transition temperatures (T_g), and tested for thermal properties such as specific heat, thermal conductivity and coefficient of thermal expansion, and temperature -dependent mechanical properties such as dynamic Young's modulus, logarithmic decrement, creep coefficient and compressive and flexural strengths.Thermal properties of REC_s were very similar to those of ordinary cement concrete. Deformation and strength properties of REC_s were temperature-dependent, and showed distinct inflection points in temperature in the respective properties where temperature -dependence became dominant. The inflection points were related to the HDT of the resins used rather than T_g, and were not affected by the resin content. The points can be defined as 'heat distortion temperatures of REC_s". The maximum ambient temperature must be limited to these points or lower for the structural use of REC_s. Consequently, the high HDT of the resins is preferable for structural REC_s.Resin concrete (REC) is a concrete in which aggregates are bonded with synthetic resin instead cement