• 대한토목학회논문집
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• 제12권2호
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• pp.55-66
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• 1992

인공해수 및 5종류의 약품용액에 시멘트풀, 모르터 및 콘크리트 공시체를 침지하여 강도 및 중량 변화를 측정하고 X-ray, SEM 및 EDS로서 반응생성물과 미세구조를 분석 고찰하였다. 연구결과 황산 및 황산염용액에서는 ${SO_4}^{2-}$ 이온의 침투로 인한 ettringite와 석고의 생성이 열화의 원인이 되었다. 염화물용액에서는 $Cl^-$ 이온의 침투가 콘크리트를 열화시키는 중요한 요인이 되었음을 알 수 있었다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2003년도 학술.기술논문 발표회
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• pp.103-106
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• 2003

Recently, it is increased on the concern for the reuse of waste concrete because of the shortage of natural aggregate and the increase of waste concrete. And recycled coarse aggregate is used variously, but the existing wet method producted recycled fine aggregate has problems like the high price facilities, the long time progress of the work and recycled fine aggregate of poor. The aim of this study is to investigate the possibility of the method of dry producted high qualities recycled fine aggregate. The results of this study have shown that the possibility of the method of dry is certificated as the qualities of recycled fine aggregate satisfied the KS and the compressive strength of mortar was similar to plain.

• 대한토목학회논문집
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• 제3권1호
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• pp.53-64
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• 1983

연탄재를 분쇄하여 미립(微粒)재를 시멘트 대용으로 그리고 조립(粗粒)재는 잔골재 및 굵은골재용으로 각각 분류하여 콘크리트나 시멘트 2차제품용으로 사용할 수 있는지를 실험을 통하여 검토하였다. 본 실험 이외에도 연탄재의 기본물성(基本物性) 및 연탄재를 사용한 콘크리트의 몇몇 역학적성질(力學的性質)에 관한 연구 검토가 필요하겠으나, 연탄재를 모르터나 콘크리트용 재료로 사용할 수 있는 가능성을 시사한 실험결과로 생각된다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 봄 학술발표회 논문집
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• pp.1017-1022
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• 2003

The hydraulic structures such as aqueduct tunnels and the drainage canal of the hydroelectric power plant in Japan are almost old. Therefore, the concrete surface of the aqueduct tunnel has received damage by wear-out and the crack, etc. This study was to develop repair mortar mixed a coal ash coarse powder by using two kinds of high early strength cements. As a result, the repair mortar was obtained by substituting the EF cement (maid in Japan) and the MT cement (maid in South Korea) at a rate of 60:40, and substituting the coal ash 30% and the mixing rate 35% of the artificial aggregate for natural fine aggregate.

• 한국농공학회지
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• 제40권5호
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• pp.52-58
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• 1998

The objective of this study was to develop a polymer mortar protection block with high strength and durability using unsaturated polyester resin to complement defects of conventional cement mortar protection block. Physical and mechanical properties of the polymer mortar protection block were also investigated. Low absorptivity, high impact strength, and great bending strength of the polymer mortar protection block was compared with those of the conventional cement protection block. In conclusion, the polymer mortar protection block is excellent and useful as industrial products for erosion control works.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2005년도 학술발표논문집
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• pp.117-122
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• 2005

Prepacked polymer mortar that is mainly composed of MMA monomer and used for the patching and restoring materials of concrete structures was developed, and its hardening and strength properties were experimentally surveyed. Results of study show that the permeance of binder into the aggregate was excellent for the case of PMMA mixing ratio of below 10%, the surface hardening inferiority was not generated for the case of the ratio of over 5%. Working time of the prepacked polymer mortar and hardening shrinkage tended to decrease as the PMMA mixing ratio increased. On the other hand, the ratio turned out not to decisively affect on compressive and flexural strengths. Regardless of PMMA mixing content, the adhesive strength was about 2.5 MPa. Occurring the desquamation on the substrate of cement concrete showed the adhesive strength of MMA prepact polymer mortar was excellent.

• 자원환경지질
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• 제32권1호
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• pp.13-18
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• 1999

The tailings stocked at two tailing piles in Sangdong aea have raised collapse hazards and various environmental problems. A trial for effective utilization of tailings as fine aggregates for polymer concrete has been performed along with mineralogical and physical characterization of tailings. The tailings from the Sangdong mine, mainly composed of quartz, orthoclase, amphiboles and muscovite, are alkaline and tailings at the new tailing pile are generally finer in grain size than those at the old tailing pile. In case of using New Tailings as fine aggregates, cement mortar with equivalent amounts of tailings and sands shows the highest compressive strength. Cement mortars containing tailings show lower values of compressive strength, splitting tensile strength and flexural strength than those not-containing tailings. Mixture of polymers such as SBR and EVA in cement mortars raises strengths of cement mortars effectively, which shows potential possiblity to utilize the tailings in Sangdong area as fine aggregates for polymer concretes.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2003년도 학술.기술논문발표회
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• pp.103.2-108
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• 2003

The purpose of this study is to understand the Physical characteristics of cement mortar about humidity control on indoors and wall crack restraint. Experiments were conducted on the strength, water absorption coefficient, drying-shrinking crack, length change, cracks of mortar plaster bases according to mixture rate by mixing cellulose fiber and diatomite into cement mortar. The excellent tensile & bending reinforcement efficiency of cellulose fiber and void filling ability of diatomite proved to be suppressing cracks of cement. And diatomite seems to improve moisture-protection efficiency of cement mortar because of its high water absorption ratio and slow drying speed.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2006년도 춘계학술논문 발표대회 제6권1호
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• pp.9-13
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• 2006

The purpose of this study was to introduce the applied care of PC beam-column interior joint with splice type rebar. In this case, although the erection time of the introduced case was a little bit higher than that of general precast concrete method, this method was more effective than general precast concrete method in aspect of direct cost and the number of column joint. Therefore, this method could be adopted in the construction of the commercial and residential building in the future.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2003년도 학술.기술논문발표회
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• pp.103.1-106
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• 2003

Recently, it is increased on the concern for the reuse of waste concrete because of the shortage of natural aggregate and the increase of waste concrete. And recycled coarse aggregate is used variously, but the existing wet method producted recycled fine aggregate has problems like the high price facilities, the long time progress of the work and recycled fine aggregate of poor. The aim of this study is to investigate the possibility of the method of dry producted high qualities recycled fine aggregate The results of this study have shown that the possibility of the method of dry is certificated as the dualities of recycled fine aggregate satisfied the KS and the compressive strength of mortar was similar to plain.