Recycling Lime Byproduct Waste for High-Performance Concretes

• Main Authors: Shih-Wei Kuo, 郭世偉
• Other Authors: Chien-Te Hsieh
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/87724929723696194035

碩士 === 元智大學 === 化學工程與材料科學學系 === 102 === Desulphurized products are common in such industries that involve environmental engineering, petrochemicals, high-molecular materials; scrap rubber energy utilization, steel, etc. To prevent the excess emission of sulfur oxides, limestone is used to create a solid waste known as the lime byproduct. This research used the self-cementation ability of lime byproduct to partially replace the use of cement and applied it in high-performance concrete products, with the aim of recycling the solid waste. In this article, we first analyze the components of lime byproduct, followed by observation of concrete specimens by pouring them into molds. We investigate the compressive strength, drying shrinkage and toxicity characteristic leaching procedure (TCLP) test specimens at different ages, to examine the effectiveness of the long-term application of high-performance concrete made from a concrete-furnace slag powder cementation system with the addition of lime byproduct. These findings could be useful in promoting the recycling of lime byproduct in the future. The results indicate that the main components of the lime byproduct are the same as those of concrete and furnace slag. The results also show that hydration products, such as ettringite and C-S-H gel, when added into the concrete, achieve design strength in the compressive strength test, durability in the drying shrinkage test and are evaluated as acceptable in the TCLP environmental test. This article found that the recycling of lime byproduct is not only a potential environmental conservation issue, but it also has high added value in the industry.