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

可持续发展的概念在北美和全世界越来越受到重视。这一概念要求满足我们当前的需要，同时不损害后代的需要。在建筑业，可持续发展是通过不同的方法实现的，包括：（a）尽量减少使用天然资源，例如石块，并尽量将回收的建筑物料循环再造，以建造新的建筑物;（B）减少弃置于堆填区的建筑及工业废物，以保育土地;（c）增加在混凝土和建筑材料中使用辅助胶凝材料，以减少波特兰水泥的耗用量，及（d）生产耐用性更高及使用寿命更长的建筑材料。本研究项目旨在针对上述方法。具体而言，该项目有三个目标：（1）开发实际应用，以拆下的混凝土（称为再生混凝土集料）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产生的碱对在同一混凝土配合比中与RCA一起使用的天然集料的反应性的影响的一些耐久性方面（这将补充加拿大其他大学在RCA领域的现有研究），以及（3）研究含有多种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).