海水海砂再生混凝土与玻璃纤维增强塑料筋黏结性能

Bond Behavior Between Seawater Sea-sand Recycled Aggregate Concrete and Glass-Fiber-Reinforced Polymer Bars

摘要:

采用标准立方体中心拔出试验，测试了不同组分及不同强度混凝土与玻璃纤维增强塑料（GFRP）带肋筋之间的黏结滑移性能.结果表明：再生粗骨料的使用降低了混凝土与GFRP筋之间的黏结强度，海水、海砂的使用对混凝土的黏结强度基本没有影响；不同组分混凝土与GFRP筋的黏结滑移曲线相似，无明显差别；与普通混凝土相似，海水海砂再生混凝土与GFRP筋的黏结强度随着混凝土的立方体抗压强度增加而增加.采用4种不同适用于GFRP筋的黏结滑移本构模型对试验数据进行了拟合，结果表明：4种模型均能较好地拟合本次试验曲线，其中，Malvar模型拟合程度最高.

关键词:海水海砂再生混凝土; 玻璃纤维增强塑料（GFRP）筋; 黏结性能; 拔出试验

Abstract:

The standard cube pullout tests were conducted to study the bond behavior between the ribbed glassfiberreinforced polymer (GFRP) bars and concrete made with different raw materials and different strengths. The results showed that the use of recycled coarse aggregate (RCA) decreased the bond strength while seawater seasand (SS) had nominal effect on that of concrete. Different concretes shared similar bond stressslip curve. Similar with natural aggregate concrete (NAC), the bond strength between seawater seasand recycled aggregate concrete (SSRAC) and the ribbed GFRP bars improved with the increase of compressive strength of concrete. Furthermore, four bond stressslip models were selected to fit the experimental curves and the results showed that all the four models fitted the experimental curves well and the model proposed by Malvar had the highest coefficient of determination.

Key words:seawater sea-sand recycled aggregate concrete (SSRAC); glass-fiber-reinforced polymer (GFRP) bars; bond behavior; pull-out test