• 한국염색가공학회:학술대회논문집
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• 한국염색가공학회 2008년도 제39차 학술발표회
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• pp.143-144
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• 2008

We developed that the film fibers which was vacuum-metalized silver on the PET film played a part increasing durable on the alkali, antibiotic and another functional property. For this usage, PET film fibers with fine denier vacuum-metalized silver manufactured through changing the micro slitting machine's drive process.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2007년도 춘계학술논문 발표대회
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• pp.59-62
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• 2007

Nowadays, polymer-cement mortars are widely used in construction field(floorings and pavements, water-proofings, adhesives, repair materials, deck coverings, anti-corrosive linings) Because of excellent performance such as high tensile and flexural strength, waterproofness, excellent adhesion, good durability, improved wear and chemical resistances. This article presents the results of experimental study that investigates the effect of ambient temperature on the strength properties of polymer-modified cement mortar. Results show that when increasing the polymer proportion in mortar on different ambient temperature, the compressive strength and flexural strength are decreased, and also alkali resistance is decreased.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2007년도 추계 학술논문 발표대회
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• pp.91-94
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• 2007

It is essential every concrete structure should continue to perform its intended functions, that is maintain its required strength and durability, during the service life. However, deterioration occurs more progressively from the outside of concrete exposed to severe conditions. Deterioration in the concrete structure is due to carbonation and chloride ion attack. Therefore, concrete structure is needed to surface protection for increase durability using impregnant. Impregnant classify into two large groups in polymeric and silicate materials. Silicate impregnant is included silane and alkali silicate(sodium and lithium silicate). Thus, this study is concerned with carbonation and chloride ion resistance of self cleaning hydrophilic impregnant of concrete structure using lithium and potassium silicate. From the experimental test result, lithium and potassium silicate have a good properties as a carbonation and chloride ion resistance. Lithium and potassium silicate make good use of hydrophilic impregnant.

• 한국도로학회논문집
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• 제15권5호
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• pp.81-89
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• 2013

PURPOSES : This study is to evaluate ASR(alkali silica reactivity) resistance of ternary blended binder adding ultra fine mineral admixture. METHODS : This study analyzes ASR expansion using ASTM C 1260 and 1567. RESULTS : This study showed that the fineness of mineral admixture had no effect on ASR expansion. The expansion of ternary blended binder(UFFA 20%+FGGBS 10%) were below 0.1%, and this binder met the ASR standard. Also when adding the CSA expansion agent, ASR expansion slightly decreased. The expansion of latex modified mixture increased by 80% comparing plain mixture. CONCLUSIONS : Ternary blended binder met the ASR standard, and this binder is available in concrete bridge deck overlay.

• 패션비즈니스
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• 제9권5호
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• pp.122-135
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• 2005

It has been reported that natural dyeing is impossible without pre-treatment with metal mordanting agents. However, pre-treatment with chitosan, which has high affinity to natural dyes, could result in an excellent dyeing with various natural dyes. In this study, three treatment methods were employed; 1) Using PET without any pre-treatment (Method 1) 2) Using PET with chitosan acid solution pre-treatment (Method 2) 3) Using PET with chitosan pre-treatment and subsequent crosslinking using citric acid (Method 3) Method 2 and 3 enhanced the Cochineal dyeability remarkably compared to Mehod 1. Washfastness was also enhanced, and moisture content, static property, abrasion resistance, and fabric hand changes were investigated.

• 한국구조물진단유지관리공학회 논문집
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• 제17권1호
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• pp.76-84
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• 2013

본 연구에서는 alkali-free 및 aluminate 급결제를 사용한 OPC 및 GGBFS 숏크리트 모르타르의 응결특성, 강도특성, 전기저항성 및 염소이온 침투저항성을 실험적으로 고찰하였다. 실험결과에 따르면, alkali-free 급결제를 첨가한 GGBFS 모르타르는 응결시간 및 압축강도가 GGBFS 대체율에 관계없이 OPC 모르타르와 유사하게 나타났으나, aluminate 급결제를 첨가한 모르타르의 경우, GGBFS 대체율이 증가할수록 응결시간 및 압축강도가 크게 나타나는 경향을 보였다. 한편, 숏크리트 모르타르의 전기저항성 및 염소이온 침투저항성은 GGBFS를 50% 이상 대체한 모르타르가 우수한 경향을 나타내므로써, 적절한 대체율의 GGBFS를 사용한 모르타르가 숏크리트용 재료로써 우수한 성능을 나타낼 것으로 판단된다.

• 콘크리트학회논문집
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• 제24권5호
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• pp.577-584
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• 2012

알칼리 활성슬래그(AAS)는 $CO_2$ 배출 부하가 큰 보통포틀랜드시멘트(OPC)의 가장 확실한 대체 재료로써 구조재로 이용하기 위해서는 내구성 평가 및 검증이 필요하다. 내구성 평가지표의 큰 비중을 차지하고 있는 것이 탄산화저항성인데, 알칼리 활성슬래그는 낮은 칼슘 함유량 때문에 OPC보다 탄산화 저항성이 약한 것으로 알려져 있다. 이 연구에서는 알칼리 활성슬래그의 모재료인 고로슬래그의 염기도(CaO/$SiO_2$)를 메카노-케미컬 합성법에 의해 조정하고, 조정된 염기도에 따라 수화생성물의 구성변화와 탄산화 전 후의 물리적 특성이 어떻게 변하는지 살펴보았다. 실험 결과 염기도가 높을수록 강도 증가와 탄산화 저항성이 향상되고, 탄산화 후 강도 저하가 개선되었다.

• 콘크리트학회지
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• 제6권4호
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• pp.141-152
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• 1994

산업부산물의 플라이애쉬와 실리카흄 및 국내 부존자원이 풍부한 규사분말, 생석회 및 발포용 알루미늄 분말과 취성개선을 위한 보강용 섬유를 사용한 경량 고강도의 시멘트복합체의 개발을 위하여 오토클래브 양생에 의한 열수 알카리분위기에서의 섬유 자체의 열화현상을 조사함과 아울러 배합요인별로 건재용 경량섬유보강 규산칼슘계 시멘트복합에를 제조하여 그 역학적 특성에 관한 연구를 수행하였다. 시험결과, 탄소섬유 및 내알카리성 유리섬유는 보강용 섬유로서 적합함이 확인되었으며, 경량 섬유보강 규산칼슘계 시멘트복합체의 압축, 인장, 휨강도는 플라이애쉬와 실리카흄 혼입율 및 섬유혼입율이 증가함을 따라 증가하는 경향을 나타내었고 또한 섬유혼입율 증가에 따라 현저히 휨인성이 증가하였으며, 탄소섬유보강의 경유가 유리섬유보강의 경우에 비하여 압축, 인장, 휨강도 및 휨인성은 다소 높은 경향을 나타내었다.

• International Journal of Concrete Structures and Materials
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• 제9권2호
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• pp.145-158
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• 2015

The consequence of sulfate attack on geopolymer concrete, made from an alkali activated natural pozzolan (AANP) has been studied in this paper. Changes in the compressive strength, expansion and capillary water absorption of specimens have been investigated combined with phases determination by means of X-ray diffraction. At the end of present investigation which was to evaluate the performance of natural alumina silica based geopolymer concrete in sodium and magnesium sulfate solution, the loss of compressive strength and percentage of expansion of AANP concrete was recorded up to 19.4 % and 0.074, respectively.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2022년도 봄 학술논문 발표대회
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• pp.115-116
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• 2022

This study incorporates fine waste glass (GS) as a replacement for natural sand (NS) in fly ash (FA) based alkali activated mortar (AAm). AAms were heated at elevated temperature of 200℃, 400℃, 600℃, and 800℃ to explore the residual mass, compressive strength, thermal expansion and change in microstructure of matrix. Results showed greater resistance of AAms with increasing GS content to 50% at each temperature. Owing to the melting of GS at 800℃, the greater matrix bond was observed for AAm incorporating 75% and 100% GS as a result, the residual compressive strength was increased.