Encapsulating soil residues in concrete: an eco-efficient approach

这一伙伴关系的目标是开发低碳混凝土产品，重新利用通常运往垃圾填埋场的土壤。这项工作对加拿大减少利用宝贵的土地资源储存低价值土壤对环境的影响具有重要意义。在大多数情况下，重型卡车将废土运往垃圾填埋场，其中可能包括在掩埋前未经处理的污染土壤，从而对周围环境造成二次污染的风险。与此同时，工业混凝土产品的制造商将原始资源用于许多低价值的应用，这些应用可以通过回收和再利用材料来解决。虽然土壤修复技术确实存在，但很少有公司采用这些方法，因为垃圾填埋行业在材料进口时设定了较低的价格点。通过为这种土壤创造一个市场，就会有一种经济动机来评估土壤并对其应用去污染战略。我们的解决方案将通过以下方式提高材料的经济价值：1)采用先进的混合设计技术，优化使用低价值土壤组分作为混凝土产品生产中采掘原材料的替代品；2)利用替代粘合剂和材料，如补充胶凝材料、惰性填料、纳米颗粒等，提高混凝土的短期和长期性能，同时减少混凝土的碳足迹；iii)通过遵循衍生产品在恶劣环境条件下（如在加拿大发现的环境条件下）的行为来证明生态高效混合物的耐久性和长期性能。

The goal of this partnership is to develop low carbon concrete products that reuse soils normally destined for landfills. This work is important for Canada in reducing the environmental impact of using valuable land resources for storing low value soils. In most cases, heavy trucks send waste soils to the landfills, which may include contaminated soils that do not undergo treatment before burial, thus posing risks of secondary contamination of the surrounding environment. In parallel, manufacturers of industrial concrete products use virgin resources for many low value applications that could be addressed by recycled and reused materials. Although soil remediation technologies do exist, there are very few companies that have adopted these methods due to the low price point set by the landfill industry at the intake of the materials. By creating a market for this soil, there becomes an economic incentive to assess soils and apply decontamination strategies to it. Our solution will increase the economic value of the materials through the following: i) adapt advanced mix-design techniques to optimize the use of low value soil fractions as substitutes for quarried raw materials in the production of concrete products ii) utilize alternative binders and materials such as supplementary cementing materials , inert fillers , nanoparticles, etc., to enhance the short- and long-term performance while decreasing the carbon footprint of concrete, and; iii) attest the durability and long-term performance of eco-efficient mixtures by following the behaviour of the derived products under harsh environmental conditions such as the ones found in Canada.