Behaviour of new and existing concrete structures

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The aging infrastructure presents a serious challenge to the engineering community especially in the light of recent bridge collapses in North America. These structures designed in accordance with the existing codes are now deficient to various degrees. One of the greatest risks in Canada is the collapse of concrete buildings and the associated loss especially during an earthquake. Clearly more work is needed to move towards better sustainability of reinforced concrete structures. This can be accomplished: 1) by better design to improve the performance of structures and 2) by making the rehabilitation and repair of existing structures more feasible and efficient, thereby extending their service life. This will have an added advantage of reducing the ecological harm to the planet.