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越来越受到关注。这一概念要求在不损害后代需要的情况下满足我们目前的需要。在建筑方面，可持续发展是通过不同的方式实现的，包括：(a)尽量减少使用天然资源，例如石头，并在新建筑物中尽量回收建筑材料；(b)减少弃置在堆填区的建筑和工业废物，以保护土地；(c)增加在混凝土和建筑材料中使用补充胶凝材料，以减少波特兰水泥的消耗量；(d)生产耐久性更高、使用寿命更长的建筑材料。本研究项目旨在针对上述方法。具体来说，这个项目有三个目标：(1)发展可以拆卸混凝土（即回收混凝土骨料）代替天然石材的实际应用（包括填土、结构填筑和用于公共工程的混凝土）；(2)评估来自RCA的碱对与RCA一起使用的天然骨料的反应性的一些耐久性方面的影响（这将补充加拿大其他大学在RCA领域的研究），以及(3)调查含有多种SCM（即矿渣和粉煤灰）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).