• Title/Summary/Keyword: fiber mixed concrete

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An Evaluation of Fire Resistance Performance for Fiber-Mixed Ultra High Strength Concrete on Field application (현장 적용성을 고려한 섬유혼입 초고강도 콘크리트의 내화성능 평가)

  • Choe, Gyeong-Choel;Kim, Gyu-Yong;Lee, Tae-Gyu;Min, Choong-Siek;Koo, Kyung-Mo;Shin, Kyoung-Su
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2011.05a
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    • pp.33-36
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    • 2011
  • Recently, It has increased to use ultra high strength concrete. It is effective to mix organic fibers for preventing spalling. But if fiber mixed, flowability of concrete is decreases. The aim of this study is to evaluation of fire resistance performance for fiber-mixed ultra high strength concrete on field application. As a result, flowability of nylon fiber mixed concrete is better than polyethylene fiber mixed. In non-fiber and polyethylene fiber mixed concrete, spalling occurred. And strain converged at 0.004. Also, residual strength could not evaluate. Nylon fiber mixed concrete is effective to prevent spalling. And it remians 50% residual strength compare with compressive strength at room temperature.

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Spalling Properties of 80MPa High Strength Concrete with Fiber (복합섬유(PP,NY)를 혼입한 설계강도 80MPa 3성분계 고강도콘크리트의 폭렬특성)

  • Kim, Seong-Deok;Lee, Bum-Sik;Bae, kee-Sun;Kim, Sang-yun;Park, Su-Hee
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2009.11a
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    • pp.51-54
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    • 2009
  • In this study, the fire resistance test was carried out with a parameter such as fiber(PP+NY) mixed ratio on high strength concrete with 80MPa, and the spalling resistance property was evaluated. Concrete material test was carried out with a parameter such as fiber(PP+NY) mixed ratio(0%, 0.05%, 0.1%, 0.2%) of high strength concrete with 80MPa. Although the flowability and the strength capacity were delicately decreased with a increase of fiber mixed ratio, they satisfied the target limits. As the spalling resistance property after the fire resistance test of 3 hours, the spalling was partly shown on the high strength concrete with fiber(PP+NY) mixed ratio of 0% but, wasn't shown on the high strength concrete with fiber(PP+NY) mixed ratio of 0.05% ~ 0.2%.

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Basic Characteristics of High Performance Concrete Mixing Organic Fiber (유기섬유 복합 혼입 고성능 콘크리트의 기초적 특성)

  • Park, Byung-Kwan;You, Ji-Young;Lee, Joung-Ah;Jin, Cheng-Ri;Han, Min-Cheol;Han, Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2008.05a
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    • pp.87-91
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    • 2008
  • The study examined fire resistance of concrete followed by change of mixed rate in PP and NY composite fiber and the results were as follows. In the event of fluidity in concrete not set, plane satisfied 600±100, its target slump flow, and fluidity was reduced as organic fiber's mixed rate was increased. Air amount satisfied 3.0±1.0, its target air amount, and didn't have distinct differences in reduction and increase according to organic fiber's kind and change of its mixed rate. However, it had a tendency that fluidity was reduced as the mixed rate was increased. In characteristics of hardening concrete, the 28th day compressive strength followed by organic fiber's kind and change of its mixed rate didn't have a lot of differences and satisfied high strength scope as about 70MPa. In spalling characteristics after fire resistance test, spalling was happened in non-mixture, plane combination, and P1N0. In other combinations, spalling resistance was happened. The relic compressive strength rate was 56%, the best condition, in P3N1(PP0.03%, NY0.01% compositeness) mixing PP fiber with NY fiber at once.

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Physical and Mechanical Properties of PP Fiber Reinforced Concrete for Binder Course in Landscape Paving (조경용 포장 중간층에 사용가능한 PP섬유 보강 콘크리트의 물리·역학적 특성연구)

  • Jun, Hyung-Soon;Lee, Jae-Keun
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.16 no.1
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    • pp.17-25
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    • 2013
  • The mechanical properties appeared at the concrete mixed with Polypropylene fiber($1kg/m^3$, $3kg/m^3$, $5kg/m^3$) are compared with normal concrete and wire mesh one and evaluated. Achieved slump test to search effect that PP fiber gets to workability, even if the mixing amount of fiber increases, confirmed that slump value is no change almost. The no difference can be caused by hard mixture, but because of the big softness of fiber there is no effect greatly up to PP fiber mixing amount $5kg/m^3$ even with soft mixture. Compressive strengths and flexural strengths of the concretes with PP fiber and without the fiber are appeared almost alike. If examine load resistance ability by PP fiber mixing amount increase, it could know that the increase of fiber mixing amount improves load resistance ability and the toughness index is increased. While normal concrete is broken at the same time with crack, fiber mixed concrete stand in flexure load continuously after crack occurrence. In compare with wire mesh embeded concrete, wire mesh mixed concrete stands in some degree in flexure load by wire mesh crack occurrence and the test piece was broken at the same time. But, it could know that the PP fiber mixed concrete resist continuously to flexure load in bigger displacement.

Properities of Freshly Mixed Concrete Using Recycled Coarse Aggregates and Steel Fiber (강섬유를 혼입한 굳지 않은 재생 콘크리트의 특성에 관한 연구)

  • 구봉근;김창운;김태봉;박재성
    • Journal of the Korea Concrete Institute
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    • v.12 no.5
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    • pp.93-99
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    • 2000
  • The physical properties of freshly mixed steel fiber reinforced recycled concrete(SFRRC) were_investigated. Physical state and quality of fresh concrete were monitored batch by batch. the properties of freshly mixed SFRRC were determined in terms of slump, air content, superplasticizer, and bleeding ratio. Concrete mixtures were produced for three kinds of aggregate proportions. So, the experimental variables are various aggregate proportions, steel fiber contents(0, 0.5, 1.0, 1.5%) and steel length(30, 50, 60mm). From experimental results, optimum s/a by various experimental variables, variations of the slump by the air contents, and optimum superplasticizer to decrease unit water were presented.

An experimental study on shrinkage and crack resistance of Hwang Toh concrete mixed with PET fiber (PET보강섬유를 혼입한 황토콘크리트의 건조수축 및 균열저항성에 관한 실험적 연구)

  • Kim, Hyun-Young;Kim, Sung-Bae;Yi, Na-Hyun;Han, Byung-Goo;Kim, Jang-Ho
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.04a
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    • pp.797-800
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    • 2008
  • To decrease the usage of cement, the pozzolan reaction materials are used as a mineral admixture. Hwang Toh which is broadly deposited in Korea is well known as a environment friendly material and the activated Hwang Toh which has the property of pozzolan reaction is practically used as a mineral admixture of concrete. PET fiber which is made by recycled PET bottle controls micro crack in concrete. But the study about concrete mixed with reinforcing fiber is not enough and the property of Hwang Toh concrete mixed with PET fiber is more complicated case. So this study performed drying shrinkage experiment to analyse mechanical property of Hwang Toh concrete mixed with PET fiber.

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Evaluation on High-Temperature Mechanical Properties of 150MPa Concrete Mixed with PP and NY Fiber (PP, NY섬유를 혼입한 150MPa 콘크리트의 고온역학적 특성)

  • Baek, Jae-Uk;Kim, Gyu-Yong;Yoon, Min-Ho;Hwang, Eui-Chul;Son, Min-Jae;Nam, Jeong-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.05a
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    • pp.5-6
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    • 2017
  • Ultra high-strength concrete can prevent spalling by mixed ratio of PP and NY fiber. However, there is a lack of research on the deterioration of strength due to changes in mechanical properties after spalling prevention. In this study, the effect of high temperature on the mechanical properties of 150MPa concrete mixed with PP and NY fiber was evaluated. As a result, mixing PP and NY fiber is judge to be little effect on the mechanical properties of the 150MPa concrete at high temperature.

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Flowability and Strength Properties on Ultra High Performance Concrete Pre-mixed Binders with Fiber (섬유를 혼입한 초고성능콘크리트용 프리믹스결합재의 유동성 및 강도 특성)

  • Koo, Kyung-Mo;Hwang, In-Sung;Kwon, O-Bong
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2017.05a
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    • pp.204-205
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    • 2017
  • In this study, flowability and strength on ultra high performance concrete(UHPC) pre-mixed binders with fiber was investigated. The flow of UHPC with pre-mixed binders was higher than that of seperate mixing conditions. The UHPC using PVA fiber with high specific surface area showed a low flow compared to steel fiber. An pre-mixing method led to improved strength of UHPC and low deviation of specimens due to dispersion effect of each materials.

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An Analytic Study on the Creep Properties for Fibers Mixed of High Strength Concrete (고강도 콘크리트의 섬유 혼입에 따른 크리프 특성 분석에 관한 연구)

  • Park, Hee-Gon;Kwon, Hae-Won;Lee, Bo-Hyeong;Bae, Yeoun-Ki;Lee, Jae-Sam;Jung, Sang-Jin
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2009.11a
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    • pp.81-85
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    • 2009
  • In the recent years, the high strength concrete has increasingly been used according to extending market of tall buildings. However, Ministry of Land, transport and Maritime Affairs was established by law with an alternative plan after June 2008 because of the weakness of high strength concrete accompanied spalling phenomena in fire. The mix design of concrete has to properly meet standards which are the spalling resistance of concrete and limited temperature of steel reinforcement. The fire proof concrete mixed fiber has widely been used to meet spalling safety on the many construction sites, the most researches about the fire proof concrete mixed fiber had being carried out focused on fire resistance, compressive strength and cast in place of concrete. But the most important thing is column shortening used the fire proof concrete within the vertical members. In this paper, the fire proof concrete filled spalling safety standards was experimented by required material when the column shortening is revised between normal concrete and fire proof concrete mixed fiber and then the results have done a comparative analysis. Also, The paper aimed to indicate a basic data for revision of column shortening of fire proof concrete.

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Flexural Strength Testing of Topping Concrete base of Artificial Greening Layer based on Synthetic Macro Fiber Mixture Ratio (인공지반녹화 하부 누름콘크리트에 혼입되는 합성 매크로 섬유의 비율별 휨 성능 검토)

  • Han, Yoon Jung;Lee, Jung Hun;Song, Je Young;Jang, Duk Bae;Oh, Sang-Keun
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2015.11a
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    • pp.38-39
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    • 2015
  • For the purpose of reducing defects (cracking) in topping concretes cast as artificial greening layer base, synthetic macro fibers were mixed. The flexural strength of synthetic macro fiber mixed topping concretes was tested via comparing its performance with current topping concrete. According to the results of the testing, topping concrete with adjusted mixing ratio after mixing with 1kg of synthetic macro fiber showed approximately 15% higher flexural strength compared to the current topping concrete.

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