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Repair and structural performance of initially cracked reinforced concrete slabs

机译：最初开裂的钢筋混凝土板的修复和结构性能

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摘要

Crack is one of the most common defects observed in reinforced concrete slabs and beams. Major cracks in concrete structures may occur due to overloading, corrosion of reinforcement or differential settlement of support. To restore the structural capacity of the distressed elements, retrofitting and/or strengthening are needed. There are different techniques available for retrofitting and strengthening of different reinforced concrete structural elements reported in the literature. This paper investigates the structural behaviour of cracked reinforced concrete one-way slab, which is repaired using different techniques. Five different techniques are used for the purpose of repair in the cracked concrete slab namely; cement grout, epoxy injection, fer-rocement layer, carbon fibre strip and section enlargement. The slabs were loaded to failure stage and the structural response of each slab specimens have been predicted in terms of deflection, variation of strain in concrete and steel, collapse loads and the failure modes. The efficiency of different repair and strengthening techniques and their effects on the structural behaviour of cracked one-way reinforced concrete slab had been analyzed. It was observed that the type of repair technique used will affect the load carrying capacity of the slab and will lead to a redistribution of the strains and hence stresses in both concrete and steel reinforcement. All repair techniques are found to be able to restore or enhance the structural capacity of cracked concrete slabs.
机译：裂纹是钢筋混凝土板和梁中最常见的缺陷之一。由于过载，钢筋腐蚀或支撑物不均匀沉降，混凝土结构可能会出现重大裂缝。为了恢复受灾元件的结构能力，需要翻新和/或加固。文献中报道了可用于翻新和加固不同钢筋混凝土结构元件的不同技术。本文研究了开裂钢筋混凝土单向平板的结构性能，该单向平板采用不同的技术进行修复。为了修复破裂的混凝土板，使用了五种不同的技术：水泥灌浆，环氧树脂注浆，高铁水泥层，碳纤维带和截面扩大。将板加载到破坏阶段，并根据挠度，混凝土和钢的应变变化，坍塌载荷和破坏模式预测了每个板样本的结构响应。分析了不同修复和加固技术的效率及其对单向开裂钢筋混凝土板结构性能的影响。据观察，所使用的修补技术的类型将影响平板的承载能力，并导致应变的重新分布，从而导致混凝土和钢筋中的应力。发现所有修复技术都能够恢复或增强开裂的混凝土板的结构能力。

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