공용중인 아스팔트 포장의 아스팔트층 동탄성계수와 FWD 역산 탄성계수의 상관관계 분석 = Analysis on Relationship between FWD Back-calculated Modulus and Dynamic Modulus of Asphalt Layers for Existing Asphalt Pavements

다국어 초록 (Multilingual Abstract)

PURPOSES: The objective of this study is to analyze the relationship between the FWD back-calculated modulus and dynamic modulus of asphalt layers for existing asphalt pavements.
METHODS: To evaluate the dynamic modulus of the asphalt mixture in the existing and new asphalt layers, the uniaxial direct tension test was conducted on small asphalt specimens obtained from the existing asphalt-covered pavements. A dynamic modulus master curve was estimated by using the uniaxial direct tension test for each asphalt layer. The falling weight deflectometer (FWD) testing was conducted on the test sections, and the modulus values of pavement layers were back-calculated using the genetic algorithm and the finite element method based back-calculation program. The relationship between measured and back-calculated asphalt layer moduli was examined in this study. The normalized dynamic modulus was adopted to predict the stiffness characteristics of asphalt layers more accurately.
RESULTS: From this study, we can conclude that there is no close relationship between dynamic modulus of first layer and back-calculated asphalt modulus. The dynamic moduli of second and third asphalt layers have some relation with asphalt stiffness. Test results also showed that the normalized dynamic modulus of the asphalt mixture is closely related to the FWD back-calculated modulus with 0.73 of R square value.
CONCLUSIONS: The back-calculated modulus of asphalt layer can be used as an indicator of the stiffness characteristics of asphalt layers in the asphalt-covered pavements.

목차 (Table of Contents)

• ABSTRACT
• 1. 서론
• 2. 시험현장 소개
• 3. 아스팔트 동탄성계수 측정
• 4. FWD 처짐을 이용한 도로포장의 층별 탄성계수 역산
• 5. 아스팔트 혼합물 동탄성계수와 FWD 역산 탄성계수의 상관관계 분석
• 6. 결론
• REFERENCE

참고문헌 (Reference)

1 Kutay, M. E., "Use of Small Samples to Predict Fatigue Lives of Field Cores:Newly Developed Formulation Based on Viscoelastic Continuum Damage Theory" National Research Council (2127) : 90-97, 2009

2 NHI, "Pavement Deflection Analysis -Participant Workbook" FHWA, U.S. Department of Transportation 1994

3 Park H. J., "Investigation into Top-Down Cracking of Asphalt Pavements in North Carolina" National Research Council 45-55, 2013

4 손종철, "Falling Weight Deflectometer 처짐값을 이용한 아스팔트 포장체의 구조적 상태 평가기법 개발" 한국도로학회 8 (8): 115-124, 2006

5 Park, S. W., "Development of a Backcalculation Method for Estimating Pavement Layer Modulus Using the Genetic Algorithm" 27 : 441-447, 2007

6 Park, H. M., "Assessment of pavement layer condition with use of multiload-level falling weight deflectometer deflections" TRB, National Research Council 107-116, 2005

7 Ullidtz, P., "Analytical Procedures in Nondestructive Testing Pavement Evaluation" TRB, National Research Council 61-66, 1995