Thermal Compatability of Concrete and Composite Reinforcement

混凝土和复合钢筋的热相容性

• 批准号: 9522825
• 负责人: Russell Gentry
• 金额: $ 3.85万
• 依托单位: Catholic University of America
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-12-01 至 1997-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9522825&HistoricalAwards=false
• 关键词: Thermal; Compatability; Concrete; Composite; Reinforcement

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.

9522852龙门架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增强受环境暴露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不热兼容。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。 复合材料增强体的横向各向同性加剧了热不相容性的考虑。 为了量化这种潜在的热不相容性的影响，并验证制造商关于热相容性的声明，计划通过实验确定复合钢筋的纵向和横向热膨胀系数。 粘结退化的可能性，由于热循环，然后将探讨使用简单的拔出试验的混凝土/复合钢筋试样已热循环。 最后，爆裂应力所造成的复合钢筋在混凝土中的横向膨胀的效果将探讨使用梁试样与不同级别的复合钢筋的清晰覆盖。