超高性能玻璃砂混凝土-高强钢筋粘结滑移特性及其声发射参数表征

Bond⁃slip characterization between ultra⁃high performance glass sand concrete and high⁃strength reinforcement based on acoustic emission parameters

为研究超高性能玻璃砂混凝土(UHPGC)与HRB600高强钢筋的粘结性能,分析了水胶比(0.17、0.19、0.21)、钢纤维体积掺量(1%、2%、3%)和玻璃砂替换率(0%、50%、100%)对UHPGC工作及力学性能的影响规律。通过中心拉拔试验并结合声发射实时监测明确了UHPGC-HRB600高强钢筋粘结性能变化规律。结果表明:掺入玻璃砂能提高UHPGC的抗压强度,其最佳替换度为50%;粘结强度与水胶比和钢纤维掺量呈正相关关系,且随着玻璃砂替换度的增大呈先增长后减小的规律;UHPGC和HRB600粘结滑移破坏形式主要分为劈裂破坏和劈拉破坏两种;声发射参数呈现良好的粘结滑移表征能力。

In order to investigate the bonding performance between ultra-high performance glass sand concrete(UHPGC)and HRB600 high-strength reinforcement,the influences of water-cement ratio(0.17,0.19,0.21),steel fiber volume fraction(1%,2%,3%)and glass sand replacement ratio(0%,50%,100%)on the working and mechanical properties of UHPGC were analyzed.The variations of bonding performance between UHPGC-HRB600 were clarified based on pull-out test and acoustic emission monitoring.The results reveal that the addition of glass sand can improve the compressive strength of UHPGC,and corresponding optimum replacement ratio is 50%.The bond strength is positively correlated with the water-cement ratio and the amount of steel fiber,while it presents first increase and then decrease with the increase of the replacement ratio of glass sand.The bond-slip failure between UHPGC and HRB600 can be mainly divided into two types:splitting failure and shear pullout failure.The acoustic emission parameters exhibit favorable bond-slip characterization ability.