Innovative applications and durability of concrete containing construction and industrial by-products

可持续发展的概念在北美和世界范围内受到越来越多的关注。这一概念要求在不损害子孙后代需要的情况下满足我们目前的需要。在建筑业，可持续发展通过不同的方法实现，包括：(A)最大限度地减少使用石头等自然资源，并最大限度地回收新建筑中的再生建筑材料；(B)通过减少在堆填区处置的建筑和工业废物的数量来保护土地；(C)通过在混凝土和建筑材料中更多地使用辅助胶结材料来减少波特兰水泥的消耗；以及(D)生产耐久性更好、使用寿命更长的建筑材料。本研究项目旨在针对上述方法进行研究。具体地说，这个项目的目标有三个：(1)开发实际应用，其中被称为再生混凝土骨料(RCA)的拆除混凝土可以用来代替天然石料(这些应用包括沟渠填充、结构填充和公共工程混凝土)，(2)评估RCA贡献的碱对在同一混凝土混合中与RCA一起使用的天然骨料的反应的某些耐久性方面的影响(这将补充加拿大其他大学在RCA领域的现有研究)，(3)研究掺有一种以上矿渣和飞灰的混凝土的性能和耐久性。

The concept of sustainable development has been gaining increasing attention in North America and worldwide. The concept calls for meeting our current needs without compromising the needs of future generations. In construction, sustainable development is achieved through different approaches including: (a) minimizing the use of natural resources, such as stones, and maximizing the recycling of reclaimed construction materials in new structures, (b) conservation of lands through reducing the amount of construction and industrial wastes disposed in landfills, (c) reducing the consumption of Portland cement through increasing the use of supplementary cementing materials (SCM) in concrete and construction materials, and (d) producing construction materials of enhanced durability and longer service life. This research project is designed to target the aforementioned approaches. Specifically, the objectives of this project are threefold: (1) to develop practical applications in which demolished concrete, known as Reclaimed Concrete Aggregate (RCA), can be used in lieu of natural stones (these applications include trench filling, structural fill, and concrete for public works), (2) to evaluate some durability aspects in regards to the effects of alkalis contributed from RCA on the reactivity of natural aggregates used with RCA in the same concrete mix (this will complement current research in the area of RCA at other Canadian universities), and (3) to investigate the properties and durability of concrete containing more than one type of SCM (namely slag and fly ash).