• Proceedings of the Korean Institute of Building Construction Conference
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• 2001.11a
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• pp.58-63
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• 2001

Recently, it has been often reported that recycling of wasted glasses should be a great topic in related business circles. For the environmental reasons, a public institution are looking fur the ways of recycling these waste glasses. Consequently, the purpose of this research is to recycle crushed and powdered waste glasses by substituting for the cement in mortar and concrete. First of all, the optimum replacement ratio of Powdered Waste Glasses(PWG) can be obtained from the pilot test results. Secondary, we make advances in recycling of waste glasses as recycled to make secondary concrete products. So, we manufactured concrete brick and block contained powdered waste glasses by through mortar pilot test.

• Proceedings of the Korea Concrete Institute Conference
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• 2006.05b
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• pp.169-172
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• 2006

The IIA structures exposed to marine environment is subject to many different types of potential attack. The physical attack due to drying and wetting would increase the internal stress of concrete. The chemical attack resulting from the diffusion of ions$(Cl^-,SO_4^{2-},Mg^+)$ from seawater through the pores in concrete. Therefore the sea water resistance of concrete must be considered when it is used for structure in the ocean. The objective of this study is to evaluate chloride diffusion and corrosion characteristics of concrete when using the various concrete materials under marine environment. After 5 years of exposure, concrete incorporating 40% blast-furnace slag as replacement for type I cement with low w/c ratio of 0.42 and using the inhibitor shows excellent performance.

• Proceedings of the Korea Concrete Institute Conference
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• 2006.05b
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• pp.41-44
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• 2006

Recently, single shell lining method of construction is studied by economical method of construction to make use of high-performance shotcrete of permanent shotcrete lining concept in the UStA, Europe, Japan etc. High-performance shotcrete use is essential as permanent support that single shell lining method of construction has two functions of lining and support to shotcrete. In this research, optimum accelerator amount was decided after setting time test using alkai-free and cement mineral accelerator. Also replacement ratio of silica fume and fly-ash was determined.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2010.05a
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• pp.73-76
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• 2010

This study deals with the properties of polymer-modified mortars with a nitrite-type hydrocalumite, which are effectively used as intelligent patch materials for deteriorated reinforced concrete structures. The calumite is a material that can adsorb the chloride ions (Cl-) causing the corrosion of reinforcing bars and liberate the nitrite ions (NO2-) inhibiting the corrosion in reinforced concrete, and can provide a self-corrosion inhibition function to the reinforced concrete. Polymer-modified mortars using hydrocalumite and terpolymer powders are prepared with various calumite contents and polymer-binder ratios, and tested for corrosion inhibition. Subsequently, regardless of the polymer-binder ratio, the replacement of ordinary portland cement with the calumite has a marked effect on the corrosion-inhibiting property of the polymer-modified mortars.

• Proceedings of the Korea Concrete Institute Conference
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• 2010.05a
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• pp.309-310
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• 2010

In this study we investigated the properties of the fundamental and adiabatic temperature rise of the concrete using high volume fly-ash. For this, the fly ash was used to replace cement at replacement ratio of 40% and 50% by mass, and then the slump, air content, bleeding, compressive strength and adiabatic temperature rise test of concrete were performed.

• Proceedings of the Korea Concrete Institute Conference
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• 2003.05a
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• pp.47-52
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• 2003

This study was performed to investigate the flow behavior of fresh concrete. strength properties, and durability properties on the chloride penetration resistance of hardened concrete containing Meta-Kaolin(MK) in the range from common strength to high strength to facilitate the use. The results are compared with properties of concrete containing Si1ca Fume(SF). As a result. superplasticizer required in MK concrete was decreased by 8-28% compared to SF concrete with the same slump, but MK concrete became more sticky than SF concrete. It was also found that considering the strength, the optimal cement replacement ratio of MK was 15%, and MK had concrete durable and dense by decreasing the average pore diameter of concrete.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2016.10a
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• pp.104-105
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• 2016

From the Industrial Revolution by past to the present, Carbon emission quantity increase rapidly around the globe. Depending on this status, Also global warming are accelerated rapidly, in order to solve this status, the Climatic Change Convention is held now on. So, On this study, Utilizing the BFS, HFA, DS that we get the basic data of the cementless paste.

• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 1999.10c
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• pp.289-293
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• 1999

This research was performed to evaluate the longitudinal length change ratio of concrete used the expansive admixture. As the results of this study, the compressive strength was shown the highest value at the used 10% expansive admixture both of the dry and wet curing condition. And the length change ration was shown higher 0.0316% and 0.0529 % than that of control in wet and dry curing condition. But this value was not enough to recover the shrinkage occuring by dry shrinkage. According to this study , we have obtained 10% on normal portland cement concrete as the optimum replacement ration of expansive admixture.

• Journal of the Korea Institute of Building Construction
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• v.12 no.5
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• pp.548-557
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• 2012

In this study the thermal performance of G-PCM replaced for find aggregate in mortar specimens was evaluated using TG-DTA. As a result, it was found that when solid changed into liquid, it absorbed heat, and when liquid changed into solid, it radiated heat. In addition, the fluidity and the compressive strength of mortar with G-PCM can be applied to the floor mortar and a wall finish material. Also the higher the replacement ratio, the larger the latent heat capacity. It was found that the mortar with G-PCM slowed the increase and decrease of temperature. Thus, the duration of pleasant indoor temperature is extended by the floor and wall mortar with G-PCM. In conclusion, G-PCM is expected to reduce the heating energy consumption.

• Journal of the Korea Institute of Building Construction
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• v.3 no.4
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• pp.135-138
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• 2003

The purpose of this study was to design the self-compaction concrete mixture, having not only high strength but also compensation of shrinkage without thermal crack under 4 sides outer restraint of the member. In the experimental mix, replacement ratio of limestone Powder, CSA expansive additives, and unit water were selected as parameters, using portland blast-furnace slag cement. And, bleeding test, expansibility test, hydration heat analysis were performed. As a results, when 35% of limestone Powder, 6% CSA expansive additives are replaced at unit water 175kg/$\textrm{m}^3$, demanded performances of fresh and hardened self-compaction concrete are accomplished.