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

在加拿大和世界范围内，大量的混凝土结构处于令人担忧的状态，通常是由于劣质的建筑材料和/或实践，以及暴露在恶劣的环境条件下。其中许多将被更换或将需要大量的补救工作，以延长其使用寿命。这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。同时，紧张的财政状况、靠近城市中心的优质材料的逐渐短缺以及可持续发展原则的执行将导致增加使用具有边际或未知特性/长期外地性能的材料。

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.