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Torsional Behaviour of Steel Fibre Reinforced Alkali Activated Concrete

机译：钢纤维增强碱活性混凝土的扭转行为

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摘要

Nine alkali-activated concrete beams were produced and tested under pure torsional load to failure. The alkali-activated concrete beams were produced with following variables: (i) fibres only, (ii) conventionally reinforced or (iii) a hybrid of both fibres and conventional steel reinforcement. The fibres only beams were found to have approximately 20% higher cracking torque than conventionally reinforced beams. However, fibres only beams were observed to have lower post crack ductility and inconsistent post crack behaviour, in comparison to conventionally reinforced alkali-activated concrete (AAC) beams. On the other hand, the hybrid reinforcements in AAC beams were found to demonstrate more ductile post crack behaviour consistently of the beams tested. Hybrid reinforcement was also shown to have 20% and 25% improvement in cracking and ultimate torque compared to conventionally reinforced, which suggests that it is suitable for industrial applications to improve structure capacity. The ultimate torque results of the beams were compared to an analytical model that considered the contribution of fibres. It was found that the ultimate torque of the hybrid reinforced beam has good correlation with the model but overestimated conventionally reinforced beams.
机译：在纯扭转载荷下产生并测试九个碱活性混凝土梁。碱活化的混凝土梁采用以下变量生产：（i）仅纤维，（ii）常规增强或（iii）纤维和常规钢筋的杂种。发现纤维仅被发现具有比常规增强梁更高的裂缝扭矩大约20％。然而，与常规增强的碱活化的混凝土（AAC）梁相比，观察到纤维仅观察到较低的后裂纹延展性和不一致的后裂纹行为。另一方面，发现AAC光束中的混合增强率展示了测试的梁的更加稳定的裂纹行为。与常规增强相比，杂交增强也有20％和25％的裂缝和最终扭矩提高，这表明它适用于改善结构能力的工业应用。将光束的最终扭矩结果与考虑纤维贡献的分析模型进行比较。发现混合增强梁的最终扭矩与模型的相关性良好，但是高估的常规增强梁。

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