Impact behavior of fibre-reinforced concrete

Development and application of construction materials with outstanding impact and blast resistance capability are essential for defence or protective structures. Engineering Cementitious Composites (ECC) are high performance fibre-reinforced-concrete (FRC) composites with fibre volume fraction usually less than or equal to 2%. ECCs offer significantly improved mechanical properties than regular FRCs, and it is a promising engineering material for protective structures due to their excellent mechanical properties.

Ongoing research on the development of new impact and crack resistance construction and building materials and the study of the impact resistance ability of the new material have been conducted by Dr. Zhang and her research co-workers under the support of two research grants [1,2].  Novel impact resistant and cracking resistant hybrid-fiber reinforced Engineered Cementitious Composite (ECC) materials reinforced with appropriate volume of polyvinyl alcohol (PVA) and steel (SE) fibres were developed. A series of experiments were carried out to determine the mechanical behaviour of the material including tensile characteristics with varying strain rate to determine the rate dependence of the materials.

Fig. 1: Post-impact images of the concrete panels under impact from a 7.63 round fired from SR-25 rifle [7]