Developing new shotcretes

喷射混凝土是一种混凝土应用方法，在过去的30年中，无论是在混凝土修复行业还是采矿/地面支撑领域，其使用量都呈指数级增长。这一增长主要与这一事实有关，即它是一种快速干预方法，主要是因为它需要很少或不需要模板，并且可以应用于难以到达的地区。在维修行业中，将喷射混凝土制成几乎任何形状和纹理的能力也是其选择的重要因素。这种普及的副作用是，它对所生产的喷浆混凝土的质量和耐久性提出了新的和更严格的要求。本CRD项目的目标是研究当今喷射混凝土最敏感的一些方面，即控制和减少开裂潜力，提高特定配合比设计的绿色值，了解和减少回弹以及开发超高性能喷射混凝土。研究的预期成果在可销售的交付物和人员培训方面都具有重要意义。该项目的成果将使业主和整个加拿大社会迅速受益，有助于延长修复后的混凝土结构的预期寿命，并使采矿作业更清洁、更安全。此外，根据这些结果，加拿大混凝土建筑产品制造商可以优化其现有产品并开发新产品，从而保持其竞争力并加强其在国际市场上的地位。拟议中的研究项目将有助于为一个需要多功能和受过良好教育的劳动力的行业培养许多高素质的混凝土工程师和科学家。

Shotcrete is a concrete application method which usage has grown exponentially over the last 3 decades, both in the concrete repair industry as well as the mining/ground support field. This increase is mainly related to the fact that it is a rapid intervention method, mostly because of the fact that it requires very little or no formwork and can be applied to difficult to reach area. In the repair industry, the capacity to finish the shotcrete to nearly any kind of shape and texture has also been an important factor in its selection. The side effect of such popularity is that it has brought new and more stringent requirements on the quality and durability of the shotcrete produced. The goal of this CRD project is investigate some of the most sensitive aspects of shotcrete today, namely the control and reduction of the cracking potential, the improvement of the green value of specific mix design, the understanding and reduction of rebound and the development of ultra-high performance shotcrete.The expected outcome of the research is significant, both in terms of marketable deliverables and personnel training. The results of the project will rapidly benefit owners and Canadian society as a whole by contributing to the greater life expectancy of repaired concrete structures and cleaner and safer mining operations. Furthermore, based on these results, Canadian manufacturers of concrete construction products could optimize their existing products and develop new ones, thereby maintaining their competitiveness and strengthening their position on the international market. The proposed research venture will help prepare many highly qualified concrete engineers and scientists for an industry that is in need of a polyvalent and well-educated workforce.