方钢管再生混凝土界面粘结性能试验

对8根钢管再生混凝土柱界面粘结性能进行研究,探讨再生骨料取代率及再生混凝土强度对钢管再生混凝土界面粘结性能的影响.结果表明:钢管再生混凝土荷载-滑移曲线大致经历无滑移阶段、应力上升段、应力下降段等3个阶段,不同再生骨料取代率的钢管再生混凝土荷载-滑移曲线具有类似的特征;再生骨料的取代率对钢管与再生混凝土界面粘结强度影响显著,再生骨料取代率越高,界面粘结强度越低;再生混凝土强度对钢管再生混凝土强度有一定影响,随着再生混凝土强度提升,粘结强度逐渐增加,但增幅逐渐降低.

Test on Bond Behavior of Concrete Filled Square Steel Tubes Between Steel and Recycled Coarse Aggregate Concrete

To investigate the influence of different ratio and strength grade of recycled aggregate concrete on interfacial bond performance of concrete filled steel tube, the bond behavior of eight pieces of recycled aggregate concrete-filled steel tube is studied. The results indicate that load-slip curve of recycled aggregate concrete-filled steel tube consists of three stages, including the no slip stage, stress increase stage and stress decrease stage. The load-slip curves steel with different recycled aggregate replacement ratios have similar characteristics. The replacement ratio of recycled aggregate has a significant negative effect on the bond strength. With the increase of the replacement ratio of recycled aggregate, the bond strength decreases gradually. The strength of recycled concrete has a certain effect on the bond strength. With the increase of the strength of recycled aggregate concrete, the bond strength increases gradually, but the increase percent reduces gradually.