Long-term performance of preventive and mitigative measures for concrete infrastructures incorporating reactive/recycled/marginal aggregates

加拿大和世界各地的大量混凝土结构处于令人担忧的状况，通常是由于劣质建筑材料和/或做法以及暴露于恶劣的环境条件。其中许多将被更换或将需要广泛的补救工作，以延长其使用寿命。然后，它将是至关重要的应用设计/施工实践，以提高新的或老化的混凝土结构的长期性能。与此同时，财政状况紧张，靠近城市中心的优质材料逐渐短缺，以及可持续发展原则的实施，将导致越来越多地使用具有边际或未知特性/长期现场性能的材料。

A large number of concrete structures in Canada and worldwide are in an alarming condition, often resulting from poor quality construction materials and/or practices, and exposure to severe environmental conditions. Many of those will be replaced or will require extensive remedial work for extending their service life. It will then be crucial to apply design/construction practices for improving the long-term performance of the new or the aging concrete structures. At the same time, the tight financial situation, the progressive shortage of quality materials close to urban centres, and the implementation of sustainable development principles, will result in an increase use of materials with marginal or unknown properties/long-term field performance.