Performance of green concrete pipes made exclusively from carbon-activated steel slag

碳钢渣专用绿色混凝土管的性能

• 批准号: 556568-2020
• 负责人: Shao, Yixin
• 金额: $ 3.64万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=706242
• 关键词: Performance; green; concrete; pipes; made

Concrete pipe is an important infrastructure product and is traditionally made of Portland cement. Production of one tonne of cement requires 1.8 tonnes of virgin materials, such as limestone and clay, consumes 1,400 kWh energy equivalent, and emits 0.8 tonnes of carbon dioxide (CO2). To make concrete pipe carbon negative "green" product, it is crucial that Portland cement be replaced by an alternate environment-friendly binder in the process. Steel slag is a waste generated from steel refining process and has never been considered as a stand-alone binder in the production of construction products due to its poor hydraulic properties. The method developed at McGill University uses the carbonation activation technique to make steel slag a primary binder for construction application. The use of steel slag as a primary binder in construction products will eliminate the use of Portland cement, reduce carbon dioxide emissions, convert industry wastes into value-added products, sequester carbon dioxide into stable carbonates, and consume zero natural resources. It has been successfully applied to masonry block production marketed by Carbicrete Inc. This Alliance project investigates the possibility of producing the concrete pipes using carbon-activated steel slag system. The concrete pipes are traditionally reinforced by steel and have a much larger market than masonry blocks. The proposed research will develop a new process for a high slump slag-based concrete carbonated at very low pressure in a flexible enclosure. The microstructure of the material will be characterised and durability of the slag-based pipe will be evaluated through the corrosion tests and the sulfate resistance tests. Alkali activation will be examined for its ability to enhance the alkalinity to protect steel reinforcement and promote post-carbonation hydration. Leaching behaviour of slag-based concrete will also be examined.

混凝土管是重要的基础设施产品，传统上由波特兰水泥制成。生产一吨水泥需要 1.8 吨原始材料，例如石灰石和粘土，消耗 1,400 千瓦时的能源当量，并排放 0.8 吨二氧化碳 (CO2)。为了使混凝土管道负碳的“绿色”产品，在过程中用替代的环保粘合剂替代硅酸盐水泥至关重要。钢渣是炼钢过程中产生的废物，由于其水硬性能较差，从未被视为建筑产品生产中的独立粘合剂。麦吉尔大学开发的方法使用碳化活化技术使钢渣成为建筑应用的主要粘合剂。在建筑产品中使用钢渣作为主要粘合剂将消除波特兰水泥的使用，减少二氧化碳排放，将工业废物转化为增值产品，将二氧化碳封存成稳定的碳酸盐，并零消耗自然资源。它已成功应用于 Carbicrete Inc. 销售的砌块生产。该联盟项目研究了使用碳活化钢渣系统生产混凝土管的可​​能性。混凝土管传统上由钢材加固，其市场比砌块大得多。拟议的研究将开发一种新工艺，用于在柔性外壳中在极低压下碳酸化高坍落度矿渣混凝土。将通过腐蚀试验和耐硫酸盐试验来表征材料的微观结构并评估矿渣基管道的耐久性。将检查碱活化增强碱度以保护钢筋和促进碳化后水合作用的能力。还将检查矿渣混凝土的浸出行为。