Investigation of coarse aggregate surface treatments to enhance concrete strength

粗骨料表面处理提高混凝土强度的研究

• 批准号: 459132-2013
• 负责人: Panesar, Daman
• 金额: $ 1.56万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=542178
• 关键词: Investigation; coarse; aggregate; surface; treatments

The Amabel dolostone is the weathering-resistant rock type that caps the Niagara Escarpment for over 400 km between Hamilton and Manitoulin Island. Resistance to the opening of new Amabel dolostone quarries in Ontario has been strong. As the existing supplies approach exhaustion, and the opening of new quarries seems unlikely, the construction industry will need to find alternative aggregate sources. Existing quarries within the Gull River Formation represent a potential replacement source, but preliminary work indicates that concrete produced with Gull River limestone does not achieve the same properties as concrete produced with Amabel dolostone. Consequently, the aim of this study is to modify the surface properties of the aggregate to help improve the bond with the hardened cement paste. The advantage of this approach is that the concrete producer can potentially switch to a surface-treated aggregate while maintaining their same basic mix designs. Several surface bond enhancement methodologies will be explored and assessed for feasibility in terms of production-scale for aggregate beneficiation of Gull River limestone, including mechanical abrasion to improve surface texture, as well as aggregate coatings based on nano-silica and sodium silicate.

阿玛贝尔白云岩是一种抗风化岩石类型，位于汉密尔顿和马尼图林岛之间绵延 400 多公里的尼亚加拉悬崖之上。对在安大略省开设新的阿玛贝尔白云石采石场的抵制一直很强烈。 随着现有供应接近枯竭，并且似乎不太可能开设新采石场，建筑业将需要寻找替代的骨料来源。鸥河地层内的现有采石场是潜在的替代来源，但初步工作表明，用鸥河石灰石生产的混凝土无法达到与阿玛贝尔白云石生产的混凝土相同的性能。 因此，本研究的目的是改变骨料的表面特性，以帮助改善与硬化水泥浆体的粘结。这种方法的优点是混凝土生产商可以改用表面处理的骨料，同时保持相同的基本配合比设计。将探索和评估几种表面粘结增强方法在 Gull River 石灰石骨料选矿生产规模方面的可行性，包括改善表面纹理的机械磨损，以及基于纳米二氧化硅和硅酸钠的骨料涂层。