Thermal Compatability of Concrete and Composite Reinforcement

9522852龙门采用纤维增强塑料复合材料制成的非金属混凝土增强材料，将增强受环境影响的钢筋混凝土结构的长期耐久性。虽然塑料复合增强材料不腐蚀，但它们可能与混凝土不热相容。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长期暴露于温度波动而退化。复合材料增强材料的横向各向同性加剧了热不相容的考虑。为了量化这种潜在热不兼容性的影响，并验证制造商关于热兼容性的声明，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，通过对热循环的混凝土/复合钢筋试件进行简单的拉出试验，探索由于热循环导致的粘结退化的可能性。最后，在混凝土中复合钢筋横向膨胀引起的破裂应力的影响将通过在复合钢筋上不同水平的透明覆盖的梁试件进行探讨。

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.