• Title/Summary/Keyword: 아스팔트 콘크리트

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Estimation of Fatigue Life of Reinforced Asphalt Pavement Overlay against Reflection Cracking due to Flexural Fracture (보강 덧씌우기 아스팔트 포장의 휨파괴에 의한 반사균열 피로수명 추정)

  • Doh, Young-Soo;Kim, Kwang-Woo
    • International Journal of Highway Engineering
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    • v.2 no.4 s.6
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    • pp.101-109
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    • 2000
  • This study was performed to estimate fatigue life of polymer-modified and reinforced overlay asphalt mixtures with respect to reflection cracking in asphalt overlay pavement. In order to achieve the goal, the expedited reflection cracking test method was developed and applied to various mixtures and the results were compared one another with respect to the resistant characteristics of reflection cracking. The theoretical prediction equation of fatigue life for each mixture was suggested based on statistical analysis of experimental test results in the flexural failure mode. Since coefficients of correlation between estimated values and measured values were very high ($r^2=0.95$ or higher), the prediction model can be used for relative comparison of various pavement overlay choices to be used in the field.

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Investigation of Friction Characteristics between Concrete Slab and Subbase Layers (콘크리트 슬래브와 보조기층 사이의 마찰특성 조사)

  • lim, Jin Sun;Park, Moon Gil;Nam, Young Kug;Jeong, Jin Hoon
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.29 no.6D
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    • pp.719-726
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    • 2009
  • In this study, a series of push-off tests for lean concrete, aggregate, asphalt subbases mainly used in Korea were performed to investigate the friction characteristics between the slab and subbase layers. Use of separation membrane and wet condition of subbase were other parameters in the tests. Horizontal displacements of the slabs and friction coefficients were measured at 1st loading, stable condition (2nd and 3rd loadings), and wet condition (4th loading) by applying 40mm/hour horizontal loadings. Larger maximum friction coefficients were measured in order of the lean concrete, asphalt, aggregate, and subbases using the separation membrane at 1st loading, and in order of the asphalt, aggregate, lean concrete, and subbases using the separation membrane at stable and wet conditions. The friction coefficients of the aggregate and asphalt subbases which did not used the separation membrane decreased by the wet condition while the subbases using the separation membrane were not affected. Additional push-off tests for effects of slab thickness and temperature sensitivity of asphalt will be performed. And, effects of the friction characteristics between the slab and subbase layers on behavior and performance of concrete pavements will be investigated by structural analyses using the test results.

Study on a Prediction Model of the Tensile Strain Related to the Fatigue Cracking Performance of Asphalt Concrete Pavements Through Design of Experiments and Harmony Search Algorithm (실험계획법 및 하모니 검색 알고리즘을 이용한 아스팔트 포장체의 피로균열 공용성 관련 인장변형률 추정모델 연구)

  • Lee, Chang-Joon;Kim, Do-Wan;Mun, Sung-Ho;Yoo, Pyeong-Jun
    • International Journal of Highway Engineering
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    • v.14 no.2
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    • pp.11-17
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    • 2012
  • This research describes how to predict a model of the tensile strain related to the fatigue cracking performance of several asphalt concrete structures through design of experiments(e.g., Response Surface Methodology) and harmony search(HS) algorithm. The axisymmetric analysis program of finite element method, which is the KICTPAVE, was used to determine the strain level at the interface layer between asphalt layer and lean concrete layer. Once the training database set of various strain levels was constructed under the several condition of layer stiffnesses and thicknesses in the asphalt concrete structures, the data set was trained through the HS algorithm in order to determine the regression coefficients defined based on a response surface methodology. Furthermore, the testing set, which was not used for the training procedure of HS algorithm, was also constructed in order to evaluate whether the regression coefficients of a prediction model can be appropriately applied for other cases in asphalt concrete structures.

A Development of Prediction Model for Traffic Opening Time of Epoxy Asphalt Pavement Using Nonlinear Curve Fitting (비선형 커브피팅을 이용한 에폭시 아스팔트 포장의 교통개방 예측 모델 개발)

  • Jo, Shin Haeng;Kim, Nakseok
    • Journal of the Society of Disaster Information
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    • v.9 no.3
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    • pp.324-331
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    • 2013
  • Epoxy asphalt concrete is used to reduce dead load and to increase durability on long-span steel bridge overlay. The strength development properties of epoxy asphalt concrete are affected by time and temperature because epoxy asphalt is two-phase reactive materials. The strength development of epoxy asphalt concrete should be predicted precisely to decide traffic opening time. Based on this background in mind, the prediction model for traffic opening time for epoxy asphalt pavement was proposed in this research. The developed model using nonlinear curve fitting revealed R2 value of 0.943 while the R2 value of the existing model using chemical kinetics was 0.806. An improved precise prediction result is to be obtained when the prediction model uses accurate temperature data of pavement.

Establishment of Failure Criteria of Repeated Direct Tensile Test to Evaluate Reflective Cracking Resistance of Asphalt Concrete Pavement (아스팔트 콘크리트 포장의 반사균열 저항성 평가를 위한 반복직접인장시험의 파괴기준 설정)

  • Lee, Bong Lim;Kim, Nakseok
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.36 no.6
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    • pp.1109-1116
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    • 2016
  • There are various test methods for evaluating the reflective cracking resistance of asphalt concrete pavement. Repeated direct tensile test is cheap and simple compared to the other traditional experimental methods. Determination of failure criteria is needed to apply a repeated direct tensile test. Various methods were used to determine the number of failure of repeated direct tensile test. The number of failure was defined as the time to reach 10% of the initial load, this method can be satisfied with specified tolerance of 10%. When the thickness of specimen is increased to 50 mm from 30 mm, the failure number is increased by 13.6 times. Thus, this result shows that the thickness of pavement is a big influence on the reflective cracking resistance. Reflective cracking resistance of asphalt concrete is decreased according to the increase in opening displacement. The repeated direct tensile test can be used as a reflective cracking resistance factor in pavement design, because it can evaluate the reflective cracking resistance according to the pavement thickness, opening displacement, material properties etc.

Behavior Analysis of Ultra-Thin Whitetopping in Field (얇은 콘크리트 덧씌우기 포장의 거동 평가)

  • Kang, Jang-Hwan;Jang, Jin-Yen;Koo, Han-Mo;Cho, Yoon-Ho
    • International Journal of Highway Engineering
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    • v.6 no.1 s.19
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    • pp.25-36
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    • 2004
  • The total length of paved roads in Korea is 67,265 Km, and among these roads, about 40% of the national highways and 98% of local roads are paved with asphalt concrete. The major distress to asphalt pavement is rutting and fatigue crack. The permanent deformation including rutting accounts for about 75% of this distress. UTW(Ultra-Thin Whitetopping), which is known for its high-quality performance in asphalt pavement with rutting and cracking, seems to reduce maintenance costs significantly if it is used as the maintenance/repair method for domestic asphalt pavement. In the research, static load test was conducted to establish a behavior of Whitetopping under traffic and environmental condition. It showed that the effect of the thickness of the concrete layer and the temperature change was significant. In addition, the tensile strain as the wheel load position was close to interior and edge of concrete slab were increased up to 75% of maximum tensile strain. It showed that joint spacing must be considered in UTW design procedure.

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Application of the Absorbing Boundary Condition in Moving Force Analysis of Asphalt Concrete Track (흡수경계조건의 아스팔트 콘크리트 궤도 동적 해석에의 적용)

  • Lee, Seonghyeok;Chung, Keunyoung;Jung, Wooyoung
    • Journal of the Korean Society for Railway
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    • v.19 no.1
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    • pp.54-66
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    • 2016
  • In this study, the absorbing boundary condition was adopted to prevent elastic wave propagation due to abrupt load condition changes in moving force analysis. It was proven to be effective in reducing inappropriate noise components. Furthermore, to verify whether fixed point excitation in a laboratory test can simulate train movement effectively, the results of dynamic analysis for fixed point excitation and moving force conditions were analyzed. The dynamic stability of an asphalt track structure under a KTX train condition was also studied. Additionally, the dynamic safety of asphalt tracks was verified by comparing the results of a moving force analysis under a KTX train load and a quasi-static analysis under the design standard Korean train load.

A Comparision of Traffic Accident Possibilities for Different Pavement Materials in Wet Condition (포장재료별 습윤시 교통사고 가능성 비교 연구)

  • 장덕명;서영찬;여운웅;이대달
    • Journal of Korean Society of Transportation
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    • v.15 no.2
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    • pp.25-34
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    • 1997
  • 본 연구에서는 아스팔트 포장과 콘크리트 포장의 습윤시 교통사고 가능성을 비교하 였다. 다양한 노후도를 가진 두 포장재료에 대해 마찰력 측정장비(BPT, Britsh Pendulum Tester)로 건조 및 습윤상태에서 노면마찰력을 측정하였으며, 측정결과와 두 포장재료에 대 한 실제 교통사고율을 비교하였다. 본 연구의 결과를 요약하면 다음과 같다. (1) 노면 습윤 에 따른 마찰력 저하정도는 아스팔트 포장이 콘크리트 포장보다 컸다. (2) 노면 습윤에 따른 실제 교통사고율도 아스팔트 포장에서 훨씬 큰 것으로 나타나 (1)의 결론과 일관된 결과를 보여주었다. (3) 노면마찰력은 건조상태에서는 노면마모 정도에 크게 영향을 받지 않으나 일 단 습윤상태가 되면 노면마모가 심할수록 마찰력 저하폭이 큰 것으로 나타났다.

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