• Proceedings of the Korea Concrete Institute Conference
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• 1999.10a
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• pp.127-130
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• 1999

Physical properties and microstructure of slag blended cement were investigated to evaluate the influence of sulphates and chlorides. The compressive strength developed as high chloride content dust and gypsum added and accordingly the microstructure modification was showed. The deviation of pore size distribution and hydrates was also observed. From these results we discussed optimum condition of gypsum and high chloride content dust leading to physical properties in this study.

• Proceedings of the Korea Concrete Institute Conference
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• 2001.05a
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• pp.1035-1040
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• 2001

The effects of polymer-binder ratio and slag content on the properties of combined wet/dry-cured polymer-modified mortars using granulated blast-furnace slag (slag) are examined. As a result, the flexural and compressive strengths of polymer-modified mortar using slag reaches a maximum at a slag content of 40%, and is inclined to increase with increasing polymer-binder ratio. The water absorption, carbonation depth and chloride ion penetration depth tend to decrease with increasing polymer-binder ratio and slag content.

• Journal of the Korean Ceramic Society
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• v.36 no.6
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• pp.599-603
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• 1999

In an effort to improve the mechanical properties of the belite cement active belite cement clinker was synthesized. Properties of the clinker were characterized by a XRD, FT-IE optical microscopy and SEM. The additive effects of slag on the hydration properties were investigated by the measurement of compressive strength heat evolution and SEM. The experimental results exhibited that the 3wt% borax was effective in stabilizing $\alpha$'-C2S and the addition of 5wt% anhydrite and 40wt% slag wee effective in the hydration.

• Proceedings of the Korea Concrete Institute Conference
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• 2003.11a
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• pp.31-35
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• 2003

High-Flowability Concrete has many advanced properties and been focused on their workability. Because of the difficulty in understanding of the quality of High-Flowablity Concrete just using slump properties, many studies have been carried out rheological properties influenced on concrete fluidity. In this paper, for the purpose of expecting some level of rheological properties, the change of rheological properties of High-Flowability Concrete with dosages and types of superplasticizer, and various addition amounts addictives were investigated.

• Journal of the Korean Ceramic Society
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• v.19 no.1
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• pp.19-23
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• 1982

The technique to determine the components in the supersulphated slag cement is discussed by several selective extraction analyses. Accordingly, the rate of hydration reaction of supersulphated slag cement could be quantitatively measured by the following 3 kinds of the selective extraction analyses. (1) Determination of unreacted slag - a salicylic acid, acetone.methanol solution (2) Determination of free $CaSO_4$ - a half saturated lime water (3) Determination of free $Ca(OH)_2$ - glycerine.alcohol solution

• Journal of the Korean Ceramic Society
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• v.38 no.2
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• pp.183-192
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• 2001

산업부산물을 이용하여 3CaO.3Al$_2$O$_3$.CaSO$_4$(C$_4$A$_3$S) 클링커를 합성하였다. 이때, 원료 물질은 산업부산물로 플라이 애쉬, 고로 수쇄 및 괴재슬래그를 $Al_2$O$_3$원으로 그리고 부산석고를 SO$_3$원으로 이용하였으며, CaO원으로 천연석회석을 사용하였다. 제조된 $C_4$A$_3$S 클링커를 CaSO$_4$, CaO를 배합하여 CSA계 팽창재를 제조하였으며, 일반 포틀랜드 시멘트(OPC)에 10 wt.% 첨가하여 수화 및 물성 특성을 조사하였다. 주요 수화생성상은 에트링자이트 및 수산화칼슘이었다. 수화시 에트링자이트의 생성으로 인해 팽창 및 경화체가 치밀화되어 건조수축이 감소되었고, 강도(압출, 인장, 휨)가 향상되었다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2017.05a
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• pp.232-233
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• 2017

The purpose of this study is to evaluate the Adhesion in tension of cement mortar according to adding admixtures such as polymer dispersions, blast-furnace slag and fly ash. From the test results, the adhesion in tension is seriously affected by type of polymer compared with polymer-binder ratios and types of admixture. The maximum adhesion in tension of EVA- modified mortar is about 1.46 times, the cement mortar. It is apparent that the adhesion in tension of polymer-modified mortars according to adding two admixtures is much more improved irrespective of polymer-binder ratio.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2016.10a
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• pp.26-27
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• 2016

This study analyzes the engineering characteristics of mortar according to admixture replacement ratios in cement mortar in a high-intensity ternary system, and changes in FA and BS combination ratios, in order to deduce the optimal combination ratio of FA and BS. Results showed that due to the characteristics of unhardened mortar, flow rate increased with the increase in admixture replacement and FA combination ratios, whereas air quantity decreased and setting time was delayed. Due to the characteristics of light mortar, compression strength decreased at early material ages as the overall combination ratio of FA increased. The FA : BS combination ratio was 2 : 3 on day 28 of material age, proving the best and potentially optimal combination ratio.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2018.11a
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• pp.167-168
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• 2018

In this study, use to CBS Dust as substitution of cement was explored. And the CBS Dust was intended to be used as a cement substitute, and the possibility as a potential water hardness stimulant for BS was investigated. Test results indicated that it can be used in with BS for a potential hydroponic stimulant.

• Proceedings of the Korea Concrete Institute Conference
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• 2000.04a
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• pp.231-236
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• 2000

In this study, to present the use of the blase furnace slag fly ash derived from a large amount of the industrial products with the early strength reduction of it prevented, the initial strength is measured after a large quantity of fly ash and the required stimulus agent for the high development of the initial strength was added in blast furnace slag cement. As the results, in spite of the much addition of fly ash in blast furnace slag, the long-age strength of blast furnace slag cement was able to be improved by a proper amount of stimulus agent, and was as high as that of ordinary portland cement.