Temperature segregation and its impact on the quality and performance of asphalt pavements
作者机构：Louisiana Transportation Research CenterLouisiana State UniversityLA 70808USA Department of Civil and Environmental EngineeringLouisiana State UniversityLA 70808USA
出 版 物：《Frontiers of Structural and Civil Engineering》 (结构与土木工程前沿（英文版）)
年 卷 期：2018年第12卷第4期
页 面：536-547页
核心收录：
学科分类：1305[艺术学-设计学（可授艺术学、工学学位）] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 0813[工学-建筑学] 0814[工学-土木工程]
基 金：a part of LTRC 14-1B project supported by the Louisiana Transportation Research Center (LTRC) in cooperation with the Louisiana Department of Transportation and Development (DOTD)
主 题：temperature segregation temperature differential pavement density semi-circular bending wheel tracking dynamic modulus
摘 要：Temperature segregation is non-uniform temperature distributionacross the uncompacted asphalt mat during paving operations and mayhave detrimental effects on the quality and performance of asphaltpavements. However, many research studies conducted across the UShave reported mixed observations regarding its effects on the initialquality and long-term performance of asphalt pavements.?The objectiveof this study was to determine the effects of the temperature segregationon the density and mechanical properties of Louisiana asphalt *** asphalt rehabilitation projects across Louisiana were selected.A multi-sensor infrared bar (Pave-IR) system and a hand-held portablethermal camera were used to measure the temperature of asphalt *** core samples were collected from various areas with varyingseverity levels of temperature segregation and tested for the density,fracture resistance (J ) by semi-circular bending(SCB), rut depth by wheel tracking, and dynamic modulus (|E*|) byindirect tension (IDT) devices.?Two distinctive patterns of non-uniformtemperature distribution were observed: a cyclic and irregular temperaturesegregations. Laboratory test results showed that highly temperaturesegregated asphalt pavements (i.e., temperature differentials ≥41.7°C) can have significantly lower densities and the mechanicalproperties than the non-segregated area, especially when the temperaturedifferentials are measured at compaction.
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