Studies on the Stabilization of Stainless Steel Slags and its Application in Self-Cmpacting Concrete

• Main Authors: Te-Ho Sun, 孫德和
• Other Authors: Yeong-Nain Sheen
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/56r3y5

博士 === 國立高雄應用科技大學 === 土木工程與防災科技研究所 === 104 === This study explores the stainless steel slag stabilization and its application in Self-Compacting Concrete (SCC). In order to solve the stability problem of stainless steel slag, the fresh oxidizing slag were placed in high-temperature oxalic acid solution, high-temperature water or natural environment different conditions, to explore the stainless steel slag rapid stabilization method and when the stainless steel slag will be stabilized in the natural environment. The engineering properties of SCC containing oxidizing and reducing slag generated from stainless steel making. The oxidizing slag was employed as fine and coarse aggregates substituting to natural materials with various percentages. Meanwhile, the reducing slag partially replaces the Portland cement with a fixed water-binder ratio (w/b = 0.4) were developed in laboratory. Its properties in fresh state such as density, flow ability, viscosity, passing ability, and setting time, in hardened properties such as compressive strength, ultrasonic pulse velocity and surface resistivity were experimentally examined. Finally, the experimental data were analyzed to build predictive models of compressive strength. The results indicated that the fresh oxidizing slag placed in the oxalic acid solution or 100℃ high temperature water will be rapidly stabilizing after 30 days when compared with one placing in the natural environment needed 12 months to stabilize. SSOS substitutes aggregates 100 % and 30 % SSRS substitutes to Portland cement the Stainless steel Slag Self-Compacting Concrete (SS-SCC) are match the workability and in SS-SCC, the values of compressive strength, electrical resistivity and the 91 days ultrasonic pulse velocity (UPV) are within the good quality concrete requirement. This SS-SCC could save cost than SCC. Secondly, the strength development models, modifying from ACI-209, have also been provided for the slags-based SCC. In addition, relationships between UPV and electrical resistivity versus compressive strength within 91 days have been further established. It will contribute to environmental protection and the resource recycling.