Papers by Keyword: Blast Furnace Slag (BFS)

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Authors: Sang Hyun Lee, Han Seung Lee
Abstract: Life span of structures made with concrete was shortened by carbonation. This phenomenon makes pH in concrete lower. If pH value in concrete become below 10, rebar in concrete begin to be corroded. This pH value was effected by quantity of Ca(OH)2 that depends on cement types, hydration reaction and carbonation time. In this study, pH value and quantity of Ca(OH)2 in mortar which has blast furnace slag were tested according to hydration and carbonation time. As a test result, the more cement has blast furnace slag (BFS) and the longer carbonation time last, the lower pH value in mortar has. And using this quantitative analysis result of pH and Ca(OH)2, it may be used effectively when service life considering carbonation is predicted using FEMA.
Authors: Sang Soo Lee, Ha Young Song, Yun Seong Lee, Kang Pil Lee
Abstract: Recently, as the national policy of green growth is promoted, construction field also makes an effort to reduce CO2 gas released when producing cement continuously. In other words, as the method solving environmental pollution and resources exhaustion, lots of mineral material compounds such as blast furnace slag which is industrial by-product, fly ash, red mud, etc. are examined to be used as the substitute good of cement. Therefore, this study intended to supplement the weaknesses of blast furnace slag and red mud with blast furnace slag and red mud, as the substitute good of cement, not concrete compound, manufacture inorganic composite of cement world, which can be made with only alkali accelerator at normal temperature, without high-temperature plasticity. After confirming kinds of red mud and alkali liquids and physical property by the change of addition rate with fundamental experiment, proper mix was drawn by combining blast furnace slag.
Authors: Lin Bo Li, Jun Zhu, Qi Wang, Jun Yang
Abstract: This paper describes a method of removing phosphate (P) from aqueous solution by sorbent prepared with amorphous blast furnace slag (BFS) and hydrated lime. An orthogonal experiment was carried out to investigate the factors of hydration time, slurrying temperature and the weight ratio of blast furnace slag /hydrated lime and water/solid on the reactivity of the sorbent. Chemical composition of BFS was analyzed by atomic absorption spectrometry, microstructure and phase analysis of samples were conducted by SEM and XRD. It is found that all sorbents prepared show higher P adsorption capacity than single blast furnace slag.
Authors: Wen Huan Zhong, Tung Hsuan Lu, Wei Hsing Huang
Abstract: Electric arc furnace (EAF) reducing slag is the by-product of EAF steel-making. Currently, reducing slag is considered a waste material by the industry in Taiwan. Since the chemical content of reducing slag is similar to blast furnace slag (BFS), it is expected that reducing slag exhibits a similar pozzolanic effect as the BFS. This study used alkaline activator consisting of sodium silicate and sodium hydroxide to improve the activity of reductive slag so as to replace Portland cement as binder in concrete. Some BFS was used to blend with the reducing slag to enhance the binding quality of alkali-activated mixes. The results show that a blend of 50% BFS and 50% reducing slag can be activated successively with alkali. Also, the sulfate resistance of concrete made with alkali-activated EAF reducing slag is found to be better than that of concrete made with portland cement, while the drying shrinkage of alkali-activated EAF reducing slag concrete is greater than that of portland cement concrete.
Authors: Jeong Eun Kim, Wan Shin Park, Nam Yong Eom, Sun Woong Kim, Do Gyeum Kim, Myung Sug Cho
Abstract: In this study, some experimental investigations on the development of mechanical properties with age of high performance concrete (HPC) incorporated with blast furnace slag with fly ash or silica fume have been reported. Four different blended HPC were prepared in 0.40 water-binder ratio. At every four mixtures, the compressive strength, splitting tensile strength and modulus of elasticity at 7 and 28 days have been observed for HPC developments. Consequently, only replacement of silica fume significantly increases the mechanical properties in terms of compressive strength, splitting tensile strength and modulus of elasticity.
Authors: Jeong Eun Kim, Wan Shin Park, Sung Ho Cho, Do Gyeum Kim, Jea Myoung Noh
Abstract: It is essential that concrete component is made up with aggregate, sand, cement and water. But recently, Public concern is increasing of a variety structure, resource recycle. Also, According to heat of hydration rising, Concrete is making a causative of concrete-crack. Concrete-crack causes a falling-off in quality of concrete. Therefore, high-performance concrete is evaluated by concrete mechanical properties (compressive strength, splitting tensile strength) with different admixture (fixing W/B 34%), fly ash, blast furnace slag, and silica fume replacement ratio (50%, 50%, and 25%).
Authors: Tao Jiao, Li Xia He, Jian Fu, Jian Guo
Abstract: With low content in CaO, blast furnace slag is a unique local engineering material with characteristic of multi-hole structure and high strength. According to present technical stardard, mix composition of cement stabilized slag is determined by indoor test in different proportion of cement content. Meanwhile, in pilot project, field tests are conducted to both cement stabilized slag and traditional aggregate and indicate cement stabilized slag has obvious superiority and could be adopted completely in application in road base project.
Authors: Zu Xin Xu, Jian Xiu Huang, Huai Zheng Li, Wei Bing Chen, Wei Gang Wang
Abstract: Based on the investigation of odor concentration of retention tank in combined system, it aim at the removal of mixed odor and pressure drop with blast furnace slag, pebble, sand as improved medium and soil as contrast through mixed odor of ammonia gas and hydrogen sulfide made in lab-scale. The results showed that the removal rate of H2S by different medium packed column becomes stable after 12 days, and 35 days for NH3. Pressure drop of each column meets with Equation Ergum and under the same condition the order is as follows: soil>sand>pebble>blast furnace slag. And the removal rate of each medium is: soil>sand>blast furnace slag. The soil is good for removal but its pressure drop is so high that it limits flow charge, thus its removal rate is the lowest. As a result, sand and pebble as the medium for soil deodorization considering pressure drop and the effect of deodorization were chosen. It turns out that the removal rate of NH3 is higher than 65% while H2S higher than 98%.
Authors: Jeong Eun Kim, Wan Shin Park, Song Hui Yun, Do Gyeum Kim, Jea Myoung Noh
Abstract: This paper presents the results of an experimental study on the compressive strength, splitting tensile strength and modulus of elasticity characteristics of high performance concrete. These tests were carried out to evaluate the mechanical properties of HPC for up to 7 and 28 days. Mixtures were prepared with water to binder ratio of 0.40. Two mixtures were containing fly ash at 25%, silica fume at 5% cement replacement, respectively. Another mixture was contains blast furnace slag and fly ash at 25%. Three standard 100¥a200 cylinder specimens were prepared. HPC showed improvement in the compressive strength and splitting tensile strength when ordinary Portland cement was replaced with silica fume. Compare with specimens FA25 and BS25FA25, specimen SF5 showed much more modulus of elasticity. It shows that the use of the blast furnace slag of 25% and fly ash of 25% cement replacement has caused a small increase in compressive strength and splitting tensile strength and modulus of elasticity compared to the only use of fly ash of 25% at 28days. The results indicated that the use of blast furnace slag or silica fume provided the good performance compare to fly ash when the mechanical properties of the high performance concretes were taken into account.
Authors: Jie Zhou, Guang Ye, Klaas van Breugel
Abstract: Recently, blast furnace slag, fly ash and limestone powder are increasingly used as blending materials in producing concrete. The use of these materials not only has economical and environmental advantages, but also improves the mechanical properties, durability and workability of concrete. In this paper, the results of experimental investigations on the evolution of hydration heat and the development of microstructure of Portland cement blended with blast furnace slag, fly ash or limestone powder are presented. These results show that three blending materials accelerate the hydration of Portland cement, but result in less heat release during the first 72 hours. The Portland cement with blast furnace slag has a denser pore structure than the others.
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