• Title/Summary/Keyword: high-strength mortar

검색결과 531건 처리시간 0.026초

초고강도 콘크리트의 강도 및 내구특성에 대한 기초적 연구 (Fundamental Study on the Strength and Durability of Ultra-high Strength Concrete)

  • 강성묵;최재진;유정훈;최두선
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
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    • pp.395-398
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    • 2005
  • In recent years, the applications of high-strength concrete have increased, and high-strength concrete has now been used in many parts of the world. The growth has been possible as a. result of recent developments in material technology and a demand for higher-strength concrete in Korea. In this study, we have an object to produce the ultra-high strength concrete(Super-Con) of over 100MPa with low price materials. First, the binders for Super-Con should be selected by the tests; setting time of paste, flow value and strength of mortar. From the test results, the binders are blended with ordinary portland cement, pulverized portland cement and silica fume. Fundamentally the compressive strength, frost resistance and chloride resistance are investigated.

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응결촉진제 종류 및 치환율 변화에 따른 저시멘트 모르타르의 공학적 특성 (Engineering Properties of Low Cement Mortar with type and Various Incorporating Ratios of Setting Accelerator)

  • 조만기;한상윤;차천수;박용규;윤기원;한천구
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2015년도 추계 학술논문 발표대회
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    • pp.143-144
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    • 2015
  • In this research it was attempted to analyze the general engineering properties of low cement mortar according to the type of setting accelerator and substitution rate, when 1% substitution rate for setting accelerator was used a high rate of compressive strength manifestation was shown and that the WS-10 type setting accelerator was appropriate. For the rate of change of length, when 3% substitution rate for setting accelerator was used, it was shown that due to initial expansion the shrinkage compensation was not significant, and when taking into consideration strength and shrinkage, 1% of WS-10 was shown to be appropriate.

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초속경시멘트를 혼입한 모르타르의 기초물성평가 (Fundamental Properties of Mortar Using Rapid-Setting Cement)

  • 김성수;정호섭;박광필;고준호;전찬기;전중규
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2006년도 춘계 학술발표회 논문집(II)
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    • pp.589-592
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    • 2006
  • The growth in concrete structure repair has prompted major efforts to develop high early strength concrete. So, we were examined fundamental properties of cement mortar using the ordinary portland cement with rapid-setting cement. The experiments were carried out to investigate the characteristics of rapid-setting cement according to the blended ratio. The containing ratio of rapid-setting cement were changed five steps (20, 30, 50, 70, 100%) and then the flow value, setting time, compressive and bond strength test of cement mortar with RSC were investigated in this study.

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고로슬래그 미분말을 사용한 콘크리트 흄관에 대한 기초적 연구 (The Basic Study on the Spun Concrete Pipes using Blast-Furnace Slag Powder)

  • 조영근;김승진;박유신;성기웅;손진군
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2000년도 가을 학술발표회 논문집(II)
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    • pp.939-944
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    • 2000
  • This study examines both strength development and pore volume of high temperature curing mortar, using a blast-furnace slag powder (BFS). This study experiments with various pre-steaming period, differing curing temperature and the replacement of BFS. According to the results, the strength development of BFS mortar is stronger when higher curing temperature are used(as opposed to standard curing). Also, regardless of the curing method, pore volume decreases as the curing time increases. From these results we can identify the optimum conditions required pre-steaming period, differing curing temperature and the replacement to produce BFS mortar properties.

산업부산물을 활용한 블랙모르타르의 제조 및 물성평가 (The Manufacture and physical properties evaluation of the black mortar which applies the industrial by-product)

  • 장홍석;문경주;소승영;소양섭
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2006년도 추계 학술발표회 논문집
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    • pp.733-736
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    • 2006
  • In the many kind of construct-material, the concrete which has the high-strength and a durability is sufficient to use with structure-material. But the color of concrete is very monotony so generally concrete isn't used the out surface. although color concrete is a method of expressing surface, the combination of pigment and cement cause many Physical problem such as efflorescence phenomenon, strength degradation and so on. In this study, It attempt to develop the black mortar using the industrial by-product and to evaluate basic physical properties compare with general color concrete to solve the color concrete problem. The result of experiment showed that Black NSC which was made by-product has more visible black color than any mortar.

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순환골재미분말 사용 모르터의 역학적 특성에 미치는 양생온도의 영향 (Effect of Curing Temperature on Mechanical Properties of Cement Mortar Using Recycled Aggregate Powder)

  • 김민우;펑해동;박경택;백대현;한민철
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2011년도 춘계 학술논문 발표대회 1부
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    • pp.93-95
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    • 2011
  • This study is to investigate experimentally the engineering characteristics of cement mortar incorporating both recycled aggregate powder (RP) below 0.08 mm and cement kiln dust(CKD). RP is substituted for fine aggregate ranged from 5~15% and CKD is also substituted for RP from 10~30%. The use of RP resulted in a decrease in flow value at fresh mortar, while an increase in CKD did not affect the flow value significantly. The combination of RP and CKD provided slight increase in compressive strength at early and 28 days and in the high curing temperature at early age showed an increasing Strength value.

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제지 애쉬를 사용한 고강도 혼화재 개발에 관한 연구 (Study on the Development of High Strength Admixture using Paper Sludge Ash)

  • 이재환;서형남;김창률;민경소
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1998년도 가을 학술발표회 논문집(I)
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    • pp.87-92
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    • 1998
  • The purpose of this study is to use paper sludge ash as a material in manufacturing high strength admixture. The reactivity of paper sludge ash as iteself is low for the crystallized non-reactive $SiO_2$, but when the $SiO_2$ was removed, the phase component is mainly composed of glass phase which could react with cement hydrates. In this study, we manufactured high strength admixture using separated paper sludge ash, and examined the strength of mortar, spun concrete with and without this high strength admixture in steam curing. The strength of spun concrete with high strength admixture including paper sludge ash was more higher than that of spun concrete without admixture. As a result, it was found that paper sludge ash could be used to a pozzolanic material in manufacturing high strength admixture.

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나노클레이 첨가량에 따른 나노재료 시멘트 모르타르에 정착된 보강섬유의 인발성능 (Pullout Performance of Reinforcing Fiber Embedded in Nano Materials Cement Mortar with Nano Clay Contents)

  • 오리온;박찬기
    • 한국농공학회논문집
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    • 제55권3호
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    • pp.113-121
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    • 2013
  • Recently, it has been studied for the application of nano-materials in the concrete. Applied a small amount of nano-materials can achieve the goal of high strength, high performance and high durability. The small addition of nano clay improves strength, thermal stability, and durability of concrete because of the excellent dispersion. The present study has investigated the effectiveness, when varying with the contents of nano clay, influencing the pull-out behavior of macro synthetic fibers in nano materials cement mortar. Pullout tests conducted in accordance with the Japan Concrete Institute (JCI) SF-8 standard for fiber-reinforced concrete test methods were used to evaluate the pullout performance of the different nano clay. Nano clay was added to the 0, 1, 2, 3, 4 and 5 % of cement weight. The experimental results demonstrated that the addition of nano clay led to improve the pull-out properties as of the load-displacement curve in the precracked and debonded zone. Also, the compressive strength, flexural strength and pullout performance and of Mix No. 1 and No. 2 increased up to the point when nano clay used increased by 2 and 3 % contents, respectively, but decreased when the exceeded 3 and 4 %, respectively. It was proved by verifying increase of the scratching phenomenon in macro synthetic fiber surface through the microstructure analysis on the surface of macro synthetic fiber.

VAE 분말수지가 고강도 폴리머 시멘트 모르타르의 강도 특성에 미치는 영향 (Effect of VAE Type Powder Polymer on Strength Properties of High Strength Polymer Cement Mortars)

  • 최중구;이건철;고경택;류금성
    • 한국건축시공학회지
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    • 제15권3호
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    • pp.299-306
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    • 2015
  • 현재 건축분야에서는 시멘트 혼화용 폴리머를 혼입한 연구가 진행되고 있는 상황이다. 하지만 대부분의 연구는 보통강도 배합을 대상으로 연구가 진행되고 있다. 따라서 본 연구에서는 고강도 배합과 보통강도 배합에 VAE 계열의 분말형 폴리머를 혼입하여 고강도 폴리머 시멘트 모르타르의 강도 특성 및 역학적 성질을 검토하고자 하였다. 실험결과, 고강도 배합의 경우 VAE 폴리머 적용 시 폴리머 혼입양이 증가할수록 보통강도 배합에 비해 압축강도 및 휨강도가 감소하는 단점을 나타내지만, 폴리머필름 형성으로 인하여 인장강도 및 부착강도가 향상되는 장점을 나타내었다.

시멘트 모르타르의 황산염 침식 저항성에 대한 혼화재의 영향 (Effects of Admixture to Sulfate Attack Resistance of Cement Mortar)

  • 형원길;소승영;소양섭
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2000년도 봄 학술발표회 논문집
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    • pp.704-709
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    • 2000
  • This study is to test effects of sulfate attack on deterioration of cement mortar. Four tests have been carried out with four types of mortars mixed by ordinary portland cement and sulfate-resistant portland cement containing blast-furnace slag and fly-ash. It was immersed in sulfate solution for 7, 28, 91, and 180 days. from the test results, sulfate attack resistance of cement mortar was improved by admixtures (blast-furnace slag and fly-ash), sulfate-resistance portland cement mortar showed high resistance than ordinarily portland cement at compressive strength, and similar the resistance of sulfate attack with ordinarily portland cement mortar with admixtures.

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