Research and Development of High Performance Resin Concrete and Structural Design

树脂混凝土是用高聚物代替普通水泥混凝土中的水泥作为粘结剂的混凝土。研究开发了高性能树脂混凝土，研究了基于材料性能的树脂混凝土构件结构设计方法。主要结论如下：(1)为了发展无磁性高强建材，制备了芳纶纤维增强不饱和聚酯树脂混凝土，并对硬化混凝土的力学性能以及新拌混凝土的工作性和安放性进行了检测。芳纶纤维的掺入提高了混凝土的抗折强度和韧性。但可操作性反而下降了。芳纶纤维的最佳加入量因改善目的不同而不同。研究了不饱和聚酯树脂混凝土和环氧树脂树脂混凝土在不同环境温度下的动态杨氏模量和对数衰减率。结果表明，无论树脂含量多少，树脂混凝土的热变形温度都可以通过树脂的热变形温度来估算。(3)对于树脂混凝土的结构使用，总是需要配筋。然而，由于聚酯树脂具有较大的凝结收缩，在结构构件中会产生内应力。在结构设计中必须考虑这种应力的影响。制作了钢筋树脂混凝土受弯构件，并观察了滞止应力的产生过程。还测量了随时间变化的物理和力学性能。滞止应力的影响将在很早期根据树脂混凝土的性能进行计算，但在相当高的温度下，随着时间的推移，滞留应力的影响可能会降低。

Resin concrete is a concrete where high polymers are used as binding material instead of cement in ordinary cement concrete. Research and development of high performance resin concrete as well as the study on the structural design method of resin concrete member based on the material properties were made. Principal conclusions derived are as follows ;(1) In order to develop non-magnetic high strength building materials, aramid fiber reinforced unsaturated polyester resin concrete was made and mechanical properties of hardened concrete as well as workability and placability of fresh concrete were examined. Flexural strength and toughness of the concrete were improved when aramid fibers were added. But workability decreased on the contrary. The optimum quantity of aramid fiber addition varied with the purpose of improvement. The degree of improvement of mechanical properties was higher when steel fiber was used than when aramid fiber was.(2) Dynamic Young'modulus and logarithmic decrement of resin concrete made of unsaturated polyester and of epoxy resin were examined in various ambient temperatures. It was concluded that heat distortion temperature of resin concrete was able to be estimated from the heat distortion temperature of resin used, irrespective of its resin content.(3) Reinforcement is always provided in case of structural use of resin concrete. However, internal stress is induced in the structural member because polyester resin has fairly large setting shrinkage. The effect of this stress must be taken into consideration in the structural design.Reinforced resin concrete flexural members were made and the generation of the arresting stress was observed in the course of time. Time dependent physical and mechanical properties were also measured. The effect of the arresting stress will be calculated by the properties of resin concrete in very early period, but it may be lowered during the lapse of time in fairly high temperature.