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Evaluation of Optimized Application Rate of Emulsified Asphalt using Uniaxial Compression Test and Regression Analysis

일축압축시험 및 회기분석을 통한 아스팔트 유제의 최적 적용량 평가

  • Kim, Dowan ;
  • Mun, Sungho (The Road Pavement Research Division, No.43, Seoul National University of Science and Technology)
  • 김도완 ((주)건화 도로공항부) ;
  • 문성호 (서울과학기술대학교 건설공학과)
  • Received : 2017.03.13
  • Accepted : 2017.03.29
  • Published : 2017.04.17

Abstract

PURPOSES : Emulsified asphalt is critical for road construction. The objective of applying asphalt emulsion as an adhesive is to prevent the phenomenon of debonding between the upper and lower layers. The quantity and veriety of bituminous material can be varied according to the type of pavement and site conditions. The objective of this study is to reveal the optimum application rates of the emulsified asphalt materials by types of tack-coats using Interface Shear Strength(ISS). METHODS : In the research, emulsified asphalt was paved on the surface of the divided mixture. The specimens of paving asphalt emulsion were utilized to evaluate the bond strength of tack-coat materials. In the evaluation process, NCHRP Report 712 was utilized to investigate the Interface Shear Strength, which reflects the bond capacity of asphalt emulsion. Then, the optimum residual application rates by tack-coat types were determined using regression analysis. RESULTS :As a consequence of squared R values investigated from 0.7 to 1 as part of the regression analysis, the tendency of predicted ISS values was compared with the results. The optimum residual application rates of AP-3, RS(C)-4, QRS-4, and BD-Coat were determined to be $0.78{\ell}/m^2$, $0.51{\ell}/m^2$, $0.53{\ell}/m^2$, and $0.73{\ell}/m^2$, respectively, utilizing 4th regression analysis. CONCLUSIONS :Based on the result of this study, it was not feasible to conclude whether higher residual application of tack-coat material leads to improved bond capacity. Rather, the shearing strength varies depending on the type of pavement.

Keywords

References

  1. Dowan Kim, Sangyum Lee, Sungho Mun, (2016) "A Study of Evaluation for Optimum Content and Bond Strength Properties of Bituminous Materials applied for preventing Separation of Asphalt Pavement Layers", Journal of Korean Society of Road Engineers, 18(6), pp. 137-143.
  2. Dowan Kim, Sungho Mun. (2015) "A Study for Evaluation of Hot Mixed Asphalt Mixtures with Tack-Coat Regarding High-Frequency Dynamic Resistance Performance and Bonding Property", Internaltional Journal of Highway Engineering, Vol. 17, No. 3, pp. 35-47.
  3. Kim, Dong Kyu, Hwang, Hyun Sik, Jabonero Christopher, Ryu, Sung Woo, Cho, Yoon Ho, (2016) "Evaluation of Bond Performance for AC overlay on PCC Pavement", Journal of Korean Society of Road Engineers, 18(5), pp. 1-9.
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  5. Korea Expressway Corporation. (2012) "Expressway Construction Guide Specification".
  6. Im, Jeong Hyuk, Kim, Y. Richard, Yang, Sung Lin, (2014) "Bond Strength Evaluation of Asphalt Emulsions used in Asphalt Surface Treatments", Journal of Korean Society of Road Engineers, 16(5), pp. 1-8.
  7. Ministry of Land, Transport and Maritime Affairs. (2009) "Asphalt Mixture Production & Construction Guide".
  8. Mohammad, L.N., A.E. Mostafa, A. Bae, N. Patel, J. Button, J.A. Scherocman, (2012) "Optimization of Tack Coat for HMA Placement" NCHRP Report 712, Transportation Research Board.

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