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http://dx.doi.org/10.7855/IJHE.2012.14.3.025

Development of Model for Structural Evaluation of Anti-Freezing Layer  

Lee, Moon-Sup (한국건설기술연구원 도로연구실)
Heo, Tae-Young (충북대학교 정보통계학과)
Park, Hee-Mun (한국건설기술연구원 도로연구실)
Kim, Boo-Il (한국건설기술연구원 도로연구실)
Publication Information
International Journal of Highway Engineering / v.14, no.3, 2012 , pp. 25-32 More about this Journal
Abstract
The thickness of anti-freezing layer has been empirically determined using the frost depth obtained from the freezing index and has not been generally considered as a structural layer in pavement design procedure. In fact, the anti-freezing layer makes a role in structural layer and enables to reduce the total thickness of pavement system. The objective of this study is to develop the statistical regression model for evaluating the structural capacity of anti-freezing layer using Falling Weight Deflectormeter(FWD) test data in asphalt pavements. The FWD testing was conducted at the embankment, cutting, and boundary area of various test sections to estimate the structural capacity of anti-freezing layer in different foundation condition. It is observed from this testing that the center deflections of pavement structure with anti-freezing layer are smaller than those without anti-freezing layer ranging from 0.4 to 82.6%. To determine the variables of statistical model, the correlation study has been conducted between various FWD deflection indexes and the anti-freezing layer thickness. It is found that the ${\Delta}BDI$(%)(${\Delta}Basin$ Damage Index(%)) is highly correlated with anti-freezing layer thickness. The ${\Delta}BDI$(%) model were developed for evaluating structural capacity of anti-freezing layer using linear mixed-effect models.
Keywords
anti-freezing layer; FWD; linear mixed-effect model;
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