The Use of Recycled Concrete Aggregate in the Production of Concrete Blocks

本项目的目的是了解再生混凝土骨料（RCA）制成的混凝土砌块的性能。 加拿大混凝土砌块生产商协会（CCMPA）是加拿大混凝土砌块制造业的代表。除了致力于确保最高的质量标准和保持砖石行业强大的市场地位外，CCMPA还通过在工艺和再生材料使用方面的切实改进，接受了可持续发展议程。为了进一步扩大其可持续性，CCMPA目前对再生材料作为骨料替代品的应用感兴趣，特别是来自砖石制造废物的再生混凝土骨料（RCA）。为了生产高质量的单元，砌块生产商通常通过试验过程来定义混凝土混合物，这使得难以测试新类型的骨料，例如RCA，因为它会干扰生产效率。此外，砌块生产商通常一次生产数千个单位的砌块，这使得很难用不同的RCA替代率进行许多试验混合。因此，该项目旨在通过寻找最有前途的设计混合物来解决这个行业特有的问题，以在皇后大学使用半块形式生产RCA混凝土块。这项研究的科学数据将使CCMPA的成员能够生产出与天然骨料具有相似强度和耐久性的RCA混凝土砌块。 块生产商将受益于市场份额的增加，从而在加拿大创造就业机会。这一新产品的开发将扩大CCMPA的可持续发展组合，巩固其作为砌块行业领导者的地位。在混凝土砌块生产中大规模回收混凝土废料有助于保护天然骨料资源不被耗尽，降低废物处置前的处理成本，并保护加拿大土地和水体的生物多样性。

The objective of this project is to understand the performance of concrete blocks made with recycled concrete aggregate (RCA). The Canadian Concrete Masonry Producers Association (CCMPA) is the representative voice of the Canadian concrete block manufacturing industry. Besides working to ensure the highest standards of quality and to maintain the masonry industry's strong market presence, the CCMPA has embraced the sustainability agenda with tangible improvements in processes and use of recycled materials. To further expand its sustainability profile, the CCMPA is currently interested in applications of recycled materials as aggregate alternatives, especially recycled concrete aggregate (RCA) from masonry manufacturing waste. To produce high quality units, block producers generally define concrete mixes by a trial process that makes it difficult to test new types of aggregates, such as RCA, because it interferes with production efficiency. Furthermore, block producers normally produce block in runs of thousands of units at a time, which makes it difficult to make many trial mixes with different RCA replacement ratios. Thus, this project aims at solving this industry-specific problem by finding the most promising design mixes to produce RCA concrete blocks using half block forms at Queen's University. The scientific data resulting from this study will allow the CCMPA's members to produce concrete blocks made with RCA that have similar strength and durability as those made with natural aggregate. Block producers will benefit from an increased market share resulting in job creation in Canada. The development of this new product will expand the CCMPA's sustainability portfolio and solidify its position as a leader in the block industry. Large-scale recycling of concrete waste in concrete masonry block production can help in preserving natural aggregate resources from depletion, reducing the cost of waste treatment prior to disposal, and protecting the biodiversity in Canadian lands and water bodies.******