• Journal of the Korea Institute of Building Construction
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• v.16 no.3
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• pp.279-288
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• 2016

The fundamental performance of any construction material should cover at least two phases: safety and serviceability. Safety commonly represents adequate strength, while serviceability encompasses the control of cracking and deflections at service loads. With respect to rapid hydraulic binders as a construction material, the above two phases should also be considered. Recent research on rapid cooling ladle furnace slag (RC-LFS) has drawn much attention, particularly given that it shows remarkable rapid hydraulic ability to pulverize to a fineness of $6,300cm^2/g$. This industrial byproduct could contribute to developing the sustainability of the rapidly hardening cementitious material system. This paper aims to expand upon the applicability of an RC-LFS-based binder that is composed of two parts. It also seeks to illustrate the engineering performance of an RC-LFS-based hybrid fiber-reinforced composite and to increase the strength of the RC-LFS-based composite. Each step of this experiment followed ASTM standards. The engineering performance, in both fresh state and hardening state, was tested and discussed in this paper. According to the experimental results for fresh concrete, the air content increased following the addition of polypropylene fiber. For hardened concrete, the toughness and strength improved following the addition of a hybrid fiber. The hybrid fiber mixture, which contains 0.75% of steel fiber and 0.25% of polypropylene fiber, shows even better engineering performance than other mixtures.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2016.05a
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• pp.36-37
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• 2016

Among all the slags, ladle furnace slag (LFS) is reducing slag generated from electric arc furnace. After cooled rapidly by high-pressured air (atomizing technology), LFS has more amorphous phase than slow cooled slag. Therefore, it shows higher reactivity than another recycling slag. This material also is named by rapid cooling LFS (RC-LFS). Pulverized RC-LFS should be fully understood. This paper deal with the present some basic experimental properties and discussions about the setting time of pulverized RC-LFS with different gypsum under the various temperatures. According to the experimental results, the pulverized RC-LFS with gypsum can hydrate in a low-temperature environment, even though the initial and final setting time are delayed.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2017.05a
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• pp.24-25
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• 2017

Ambient temperature has a direct impact on the hydraulic process. Though -any experiments have been processed in order to investigate the hydration properties under the various ambient temperature of OPC, there are not reported about aluminate-based composite. This presentation is composed of contents on the experimental investigation of the hydration heat of pulverized rapid cooling ladle furnace slag based composite. Based on the experimental outcomes, gypsum can decrease the hydration heat dramatically and lower ambient temperature has a negative effect on accelerated the hydraulic process.

• Journal of the Korean Recycled Construction Resources Institute
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• v.7 no.2
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• pp.70-77
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• 2012

The Ladle Furnace Slag, about 20% of the electric arc furnace slag, has high content of free CaO and free MgO, which generates the expansion collapse by hydration reaction. Although many researchers have been endeavoring to recycle the EAF reducing slag in construction fields, there is not found the effective recycling method up to now. However, the LFS(Ladle Furnace Slag) contains mineral composition of the system of calcium aluminate with high-reactivity. Therefore, it is possible to developed the quick setting property and the high strength at the early age by the rapid cooling. This study aimed to check the reactive minerals and predict the reactivity with water on the LFS discharged from different steel product plants. The test results show that many types of LFS has hydration reactivity and can use in construction field as a inorganic binder with the rapid setting property.