Thermal Compatability of Concrete and Composite Reinforcement

9522852龙门使用由纤维增强塑料复合材料制成的非金属混凝土增强材料，将提高受环境影响的钢筋混凝土结构的长期耐久性。虽然塑料复合钢筋不会腐蚀，但它们可能与混凝土热不相容。如果这两种材料被证明是热不相容的，它们之间的结合可能会因为长期暴露在温度波动中而退化。复合材料的横向各向同性加剧了对热不相容的考虑。为了量化这种潜在的热不相容的影响，并验证制造商关于热相容的声明，计划通过实验确定复合钢筋的纵向和横向热膨胀系数。然后，将通过对已经热循环的混凝土/复合钢筋试件进行简单的拉拔试验来探索由于热循环而导致的粘结退化的可能性。最后，将使用具有不同水平的复合钢筋覆盖层的梁试件来探讨复合钢筋在混凝土中横向扩展所引起的爆破应力的影响。

9522852 Gantry The use of non-metallic concrete reinforcements made of fiber- reinforced plastic composites will enhance the long-term durability of reinforced concrete structures subject to environmental exposure. Though plastic composite reinforcements do not corrode, they may not be thermally compatible with concrete. If the two materials prove to be thermally incompatible, the bond between them may be degraded by long-term exposure to temperature fluctuations. The transverse isotropy of composite reinforcements exacerbates considerations of thermal incompatibility. To quantify the influence of this potential thermal incompatibility and to verify manufacturer's claims regarding the thermal compatibility, it is planned to experimentally determine the longitudinal and transverse coefficient of thermal expansion of composite rebar. The potential for bond degradation due to thermal cycling will then be explored using simple pull-out tests of concrete/composite rebar specimens that have been thermally cycled. Finally, the effect of bursting stresses caused by transverse expansion of the composite reinforcement in concrete will be explored using beam specimens with varying levels of clear cover over the composite reinforcements.