Experimental bond behaviour between Textile Reinforced Cement and Concrete

Subtitle:Review of the existing test methods and the analysis of the results of a modified double-lap shear test

Utilisation of high-strength fibres (such as carbon, glass or aramid) is becoming an interesting alternative for reinforcing structures in the building industry. Textile reinforced cement (TRC) composites, which combine the high tensile strength of fibres with the high compressive strength and stiffness of cement-based materials, are widely investigated for their various applications: strengthening and retrofitting of existing concrete structures, stay-in-place formwork, prefabrication of slabs, seismic design, etc. The weak point of such mixed concrete – TRC composite structures is the insufficient knowledge of the mechanical behaviour of the interface between both materials, preventing their effective utilisation. To facilitate understanding of the materials’ interaction, we present a state-of-art on the direct bond tests between fibre-reinforced cement composites and concrete, as well as new experimental results achieved by our research group. The literature review shows that the problem is widely investigated in the scientific community, however, due to its complexity it is still an unresolved issue. New bond experiments were performed based on a modified double-lap shear test as proposed by D’Ambrisi et al. As the results show, the test set-up eliminates the influence of parasitical bending and allows continuous monitoring of the entire strain field at the interface. The results of the experiments are promising and validate the proposed bond test set-up. The test results can be used for creating a numerical bond model and contribute to future design recommendations.
Keywords.

ISBN:978-1-61499-465-7

Publication year:2014

Keywords:Fibre-reinforced cement composites, bond test, bond-slip diagram