Tensile stress and strain of rear by shock wave become the cause of rear side scabbing of concrete subjected to high-velocity impact. Improvement of flexural and tensile performance by fiber reinforcement has great effect on the suppression of the rear scabbing.

In this study, local fracture of concrete was evaluated through high-velocity impact test. As results, increase of bending tension performance by fiber reinforcement did not affect penetration depth Control, but it decreased rear side fracture thickness and diameter. Therefore, it was observed that fiber reinforcement decreases scabbing limit thickness.

In this study, compressive capacity of Form-Block-Wall (FBW) was studied through prism test. Main variables are the difference in strength of grout concrete and steel fiber-reinforced block. The result showed that the strength of FBW increased corresponding to the increase of the strength of grout concrete and mortar. Also, it showed that steel fiber-reinforced FBW had a positive effect on prism strength and deformation capacity.

The effect of steel fiber types on the self-sensing capacity of strain-hardening fiber-reinforced cementitious composites (SH-SFRCs) was investigated. Three types of fiber, including twisted, smooth and hooked fibers, were used with a volume content of 1.5% in a mortar matrix. Although all the SH-SFRCs exhibited self damage-sensing capacity, the gauge factor, representing for damage-sensing ability, was different according to the types of fiber as follows: twisted (138.09) > smooth (99.85) > hooked (88.50). The SH-SFRC with twisted fiber produced the highest gauge factor which is very favorable for development of self damage-sensor.

This paper describes the analysis results of coupling beams using steel fiber reinforced concrete for comparison with measure behaviors. Analysis is performed by the finite element analysis program, Vector 2. The results show possibility that relieve complex detail of diagonally reinforced coupling beam.

In this study, it was developed hybrid fiber reinforced concrete using ground granulated blast furnace slag, the industrial wastes, and recycled aggregate. As a result of experiments on improvement of performances of eco-friendly buildings utilizing recycled resources (recycled coarse aggregates and ground granulated blast furnace slag), the following conclusions are drawn. As hybrid fiber(PVA Fiber+ Steel Fiber) was mixed with the concrete in which the replacement was conducted with recycled coarse aggregates and ground granulated blast furnace slag, the structural performance were increased.

이 연구는 강섬유콘크리트를 사용하여 온도철근을 대체할 수 있는 가능성을 평가하기 위하여, 온도철근의 대체가 가능한 강섬유의 배합비를 결정하고 이에 따른 재료역학적 특성 및 경제성을 평가하였다. 강섬유는 길이 60mm, 직경 0.75mm를 사용하고, 배합비는 부피비로 0.2%, 0.5%, 1%를 사용하였다. 평가결과 강섬유 콘크리트가 강섬유의 혼입량과는 상관없이 일반 콘크리트보다 연성이 우수하고, 강섬유를 0.5% 혼입한 경우에는 온도철근을 배근한 경우보다 경제적으로 유리한 것으로 나타났다.

this study is experiment result of steel fiber reinforced concrete(SFRC) panel with flexural and impact resistance performance. The variables are the fiber volume fraction and aggregate size. The height and width of SFRC panels are 200 mm. The experimental results showed that flexural and impact resistant performance is improved by increased in steel fiber volume fraction.

발전한 경제만큼 안전하고 편안한 이동과 여가생활을 위해 자동차 및 도로의 보급이 확대 되고 있다. 이로 인해 폐자동차의 발생율도 높아지고, 도로 포장층이 받는 부담도 커지고 있는 실정이다. 폐차과정에서 발생하는 폐기물 중 일부는 재활용이 가능하지만 수지, 섬유, 고무 등의 자동차 파쇄 잔재물(ARS)은 재활용할 방법이 마땅치 않아 2차적인 환경오염의 원인이 되어 사회적인 문제를 발생시키게 된다. 또한 도로 포장층이 받는 증가된 하중으로 포장층의 파손 발생이 운전자들의 안전을 위협하고 있다. 따라서 본 연구에서는 도로의 피로수명 연장과 파쇄 잔재물의 재활용률을 높이기 위해 파쇄 잔재물을 활용한 섬유보강 아스팔트 콘크리트에 대해 고려하였다. 폐카펫에서 추출한 나일론을 개질재로서 아스팔트 콘크리트 포장 성능에 미치는 영향을 평가 하였다. 4점 휨 피로시험을 통해 일반 아스팔트 대비 피로수명이 10%향상되었음을 확인 하였으며, 이를 통해 경제성 분석을 실시한 결과 35년간 약 5억 원의 유지보수비용 절감을 기대 할 수 있다. 폐나일론 섬유 보강 아스팔트는 친환경적 공법으로 유지보수 비용 절감과 폐자재 사용으로 환경처리비용의 이점을 가지며, 도로수명 연장으로 운전자에게 안정감과 편안함으로 경제적, 사회적 효과를 기대 할 수 있다.

In this study, experimental research was carried out to study the high strength RC exterior beam-column joints regions using reinforcing detailings and high ductile fiber-reinforced mortar. Test results showed that specimen BCJISP were increased th maximum load-carrying capacity and showed stable hysteresis behavior and satisfactory crack pattern in comparison with th standard specimen BCJC.

In this study, experimental research was carried out to improve and evaluate the seismic performance of reinforced concrete beam-column joint using Embedded Carbon Fiber Rod and Carbon Fiber Sheet in existing reinforced concrete building. Test result shows that retrofitting specimen(LBCJ-SP45, CS2, CRUS) designed by the improvement of seismic performance of reinforced concrete beam-column joints load-carrying capacities were increased 1.34 ~ 1.54 times in comparison with the standard specimen.

In this study is experiment result of steel fiber reinforced concrete shear walls with deformation capacity and structural performance. To assess the deformation capacity and structural performance of shear walls, slits and steel fiber was used as a variables. The experimental results show that steel fiber reinforced concrete shear wall is superior compared to normal reinforced concrete shear wall. The experimental results of shear wall with slits is too.

This paper addresses analysis using vector2 program of steel fiber coupling beams containing steel fiber. It shows that steel fiber of coupling beams efficiently controlled increase of crack width by bridge action.

In this study, to Assess the impact resistant performance of steel fiber reinforced concrete(SFRC), SFRC panels with different thickness impacted by spherical object. As a result, impact resistant perfirmance is increased when the thickness and SFRC increased in

In this study, it was developed eco-friendly zero cement fiber reinforced concrete using ground granulated blast furnace slag and alkali activator(water glass, sodium hydroxides). Also, it was evaluated the flexure capacity of the RC beams using zero cement concrete. The eco-friendly concrete using zero cement encouraged alkali activation reaction has rapid hardening speed and showed possibility as a high strength concrete. Also, the RC beams applied this showed similar movement and destroy tendency with RC used previous cement.

For hybrid fiber reinforced UHPC with two kinds of steel fibers, variation of the flexural behavior with different fiber distribution characteristics was estimated by experiments, and a prediction of the flexural behavior using smeared crack model. it was found that adopting a crack bandwidth considering the fiber distribution characteristics enable to predict the fractural behavior of UHPC beam.

The effects of maximum aggregate size on mechanical properties of high-strength steel fiber reinforced concrete (SFRC) were investigated in this work. Test main variable is maximum aggregate size (8 and 20mm). The cylinder specimens was casted for compressive test and the prism specimens was tested under four points loading. Test results indicated that the addition of steel fiber improves compressive and flexural behavior of high-strength concrete. Also smaller aggregate size improve mechanical properties of high fiber volume fraction SFRC.

This study was carried out to evaluate effects of curing method and age on compressive behavior of steel fiber reinforced Alkali-Activated Slag(AAS) concrete. AAS and Steel Fiber Reinforced Concrete (SFRC) material with specific compressive strength of 30MPa was reinforced with 0% to 1% steel fibers at the volume fraction. Two types of curing methods were used: water curing and exposed curing. Curing time is 3, 7, 28 day. Experimental results indicated that compressive strength, elastic modulus, compression index.

This paper describes an experimental program to investigate the shear behavior of insulated concrete sandwich panels (CSPs) with different types of GFRP shear connector. The study included testing of 13 insulated CSP specimens with two types of surface conditions for extruded polystyrene (XPS) insulation and various shapes of shear connectors. All specimens were loaded in direct shear by means of push-out and were consist of three concrete panels, two insulation layer and four rows of GFRP shear connectors. Load-relative slip between concrete panel and insulation response of CSP specimens has been established through push-out shear test. Test results indicate that the surface condition of insulation has a significant effect on the bond strength between concrete panel and insulation. The specimen used XPS foam with 10mm deep slot shows higher bond strength than those used XPS foam with meshed surface. Corrugated GFRP shear connectors show equivalent strength to grid GFRP shear connectors. Cross-sectional area and embedded length of shear connector have a notable effect on overall response and inplane shear strength of the CSP specimens.

폴리비닐알코올 섬유와 폴리에틸렌 섬유 등의 합성 섬유는 고연성 섬유보강 시멘트 복합재료를 제조하는데 성공적으로 사용되고 있다. 폴리프로필렌 섬유 역시 복합재료를 제조하는데 사용되고 있지만, 고연성을 구현하는 목적보다는 고온에 노출된 콘크리트의 내화 성능 향상 목적으로 사용되고 있다. 이 연구에서는 폴리프로필렌 섬유로 보강된 시멘트 복합재료의 성능을 향상시키는 방법에 대하여 논하고자 한다. 폴리프로필렌 섬유보강 시멘트 복합재료의 성능을 평가하기 위하여 5가지 배합을 결정하였다. 1종 보통포틀랜드시멘트 (OPC)와 OPC를 다량 치환한 플라이애시를 결합재로 사용하였고 물-결합재 비는 0.23~0.25이다. 또한 부피비로 2%의 폴리프로필렌 섬유가 사용되었으며, 연성을 향상시킬 목적으로 폴리스틸렌 비드가 사용되었다. 슬럼프, 밀도, 압축강도, 1축 인장 실험을 포함한 일련의 실험을 수행하였으며, 실험결과, 파괴역학, 마이크로역학, 통계이론을 이용하여 폴리프로필렌 섬유보강 시멘트 복합재료의 성능을 향상할 수 있는 것으로 나타났다.