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Abstract
In order to study the transfer law of roughness during asphalt pavement construction, a mathematical model concerning the effect of sublayer, paving layer, random factors and paving materials compactness on final surface layer roughness was established through theoretical deduction and data statistical analysis. The critical conditions of sublayer roughness transfer to final surface layer were determined through the application of the Error Propagation Theory, allowing to further establish, the transfer model for roughness conditions in asphalt pavement construction, internal relationships among paving roughness, initial compactness and final surface layer roughness were also clarified. Moreover, the best initial compactness under different paving smoothness was determined and the transfer model was verified using typical engineering test data.
© 2016 Chinese Society of Pavement Engineering. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Keywords: Pavement engineering; Roughness; Transfer characteristic; Critical condition; Mathematical model; Experimental verification
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1. Introduction
Good roughness is one of the essential purposes of asphalt pavement. It not only directly affects the driving quality and the riding comfort, but also the service life and the maintenance cost of pavement [1]. Ghosh's research showed that pavement roughness conditions affect energy consumption throughout the use phase [2]. Janoff's research indicated that good roughness of the pavement has fewer cracks and lower maintenance costs within 10 years [3]. In America, the roughness index in 15 states is set at a maximum gap between the pavement surface and a 3 m straight ruler, while in seven states it is set for 5mm [4]. The standard in China requires the roughness of the upper layer to decrease from 1.8 mm to 1.2 mm [5]. Moreover, some equipment manufacturers have tried to improve paving roughness through improving the structure of pavers and the performance of leveling systems [6]; the constructors have improved pavement roughness through the improvement of construction technology [7]. Based on the previous studies, this paper established a transfer law for roughness and critical conditions in construction through further theoretical analysis and experimental research, and then built a transfer model for roughness conditions of asphalt pavement construction. The model was verified using a full-scale experiment.
2. The major factors of roughness in asphalt...