Shear friction capacity of self-consolidating concrete

Abstract An experimental research was developed to evaluate shear transfer in self-consolidating. Three concrete mixes were prepared, one conventional and two self-consolidating, differing on the proportion of the coarse and fine aggregate used. Nine push-off specimens, containing steel reinforcement passing through the shear plane, were tested, to evaluate the ultimate shear stress and shear plane displacements. Shear strength of self-consolidating concrete specimens were higher than conventionally vibrated concrete. The experimental results were compared to the shear strength estimated by literature and code based equations, yielding conservative results of these equations for both types of concrete, especially the models that disregard the compressive strength of concretes.

摘要 本研究开展试验以评估自密实混凝土（self-consolidating concrete）的剪力传递性能。共制备3组混凝土配合比：1组为常规振动混凝土，2组为自密实混凝土，二者粗、细骨料的掺配比例存在差异。制备9个内置穿过剪切面钢筋的推剪试件（push-off specimens），用于测定其极限剪应力与剪切面位移。试验结果表明，自密实混凝土试件的抗剪强度高于常规振动混凝土。将试验结果与现有文献及规范公式估算得到的抗剪强度进行对比后发现，针对两类混凝土，上述公式的估算结果均偏保守，尤其是未考虑混凝土抗压强度的预测模型。