Effects of Particle Size on Expansion and Engineering Properties of Alkali-Activated BOF Slag Mortar

• Main Authors: Chen,Yi-Wei, 陳逸瑋
• Other Authors: Lin,Tzong-Tzeng
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/tj6h9a

碩士 === 國立高雄應用科技大學 === 土木工程與防災科技研究所 === 106 === The production of Basic Oxygen Furnace (BOF) slag is about 1.5 million tons/year. In past years, it has always become as a non-structural recovery materials due to its swelling characteristic and low activity index. To understand of the feasibility of the alkali-activated fine BOF slag as a structural construction material, the BOF slag fine aggreagate is divided into five kinds of grain size in this study. In addition to measuring the amount of expansion, and X-ray diffraction, SEM/EDAX, mechanic property, TCLP and other analytical techniques were used. The results show as follows: the alkali-activated slag binder added with fine BOF slag (40% of replacement), the swelling rate is only 0.23% (lower than the standard value of 0.8%); the alkali-activated slag binder added with fine BOF slag (sieve mesh size of 16 to 30), the activated index is 163.5% (higher than the standard value of 75%) and 28 days of compressive strength is 56.1MPa (higher than the standard value of 27.5MPa); all leaching concentrations of heavy metal are lower than regulation value. Consequently, the BOF slag treated by the alkali-activated process can be used as a structural construction material, and it has very stable with environmental leach test.