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Evaluation of Bonded Concrete Overlay of Asphalt under Accelerated Loading
Transportation Research Record: Journal of the Transportation Research Board ( IF 1.7 ) Pub Date : 2020-10-30 , DOI: 10.1177/0361198120961385
Moinul Mahdi 1 , Zhong Wu 1 , Tyson D. Rupnow 1
Affiliation  

Bonded concrete overlay of asphalt (BCOA), previously known as ultra-thin whitetopping (UTW), has been widely used to repair aged asphalt concrete (AC) pavements with moderate distresses. Because of the increasing costs of roadway maintenance, Louisiana has a great interest in determining whether thin BCOA (usually 2–6 in.) is a suitable and cost-effective alternative to the current practice of roadway maintenance. The objective of the study was to evaluate the performance of BCOA pavement and to identify the influence of in-situ interface bond strength on the performance of BCOA pavements. Three full-scale BCOA test sections with thicknesses of 6 in., 4 in., and 2 in. of Portland cement concrete (PCC) over an aged asphalt pavement were tested under accelerated pavement test (APT) loading under typical pavement conditions in southern Louisiana. Each section was trafficking-loaded to a failure (i.e., all the slabs in the loading path were cracked) under alternating load magnitudes of 9 kips and 16 kips of the ATLaS dual-tire wheel load. A falling weight deflectometer (FWD) backcalculated the effective thickness, a trench-cutting investigation was undertaken, and in-situ pull-off test revealed that a good bond was established initially between the PCC and AC layer. Several non-destructive test (NDT) methods indicated that the distresses of a BCOA slab could be coupled with a possible debonding at the PCC-asphalt interface. This paper mainly focuses on the APT results and the performance of BCOA test sections with different overlay thickness.



中文翻译:

加速荷载作用下沥青混凝土粘结面的评价

沥青粘结的混凝土覆盖层(BCOA),以前称为超薄白面漆(UTW),已广泛用于修复中度遇险的老化沥青混凝土(AC)路面。由于道路维护成本的不断增加,路易斯安那州对确定薄BCOA(通常为2–6英寸)是否是当前道路维护实践的合适且具有成本效益的替代方案非常感兴趣。该研究的目的是评估BCOA路面的性能,并确定原位界面粘结强度对BCOA路面性能的影响。在南部地区典型的路面条件下,在加速路面试验(APT)荷载下,对三个老化的BCOA测试截面进行了测试,厚度分别为6英寸,4英寸和2英寸的波特兰水泥混凝土(PCC)。路易斯安那州。在9 kips和16 kips的ATLaS双轮胎轮重交替加载的情况下,每个部分都被运输到失败的荷载(即,加载路径中的所有平板都破裂)。落锤挠度计(FWD)对有效厚度进行了重新计算,进行了沟槽切割研究,并且原位拉脱试验表明,最初在PCC和AC层之间建立了良好的粘结。几种非破坏性测试(NDT)方法表明,BCOA平板的遇险可能与PCC-沥青界面处的可能脱胶有关。本文主要关注APT结果以及具有不同覆盖层厚度的BCOA测试部分的性能。加载路径上的所有平板都在9 kips和16 kips的ATLaS双轮胎轮重交替变化的情况下破裂。落锤挠度计(FWD)对有效厚度进行了重新计算,进行了沟槽切割研究,并且原位拉脱试验表明,最初在PCC和AC层之间建立了良好的粘结。几种非破坏性测试(NDT)方法表明,BCOA平板的遇险可能与PCC-沥青界面处的可能脱胶有关。本文主要关注APT结果以及具有不同覆盖层厚度的BCOA测试部分的性能。加载路径上的所有平板都在9 kips和16 kips的ATLaS双轮胎轮重交替变化的情况下破裂。落锤挠度计(FWD)对有效厚度进行了重新计算,进行了沟槽切割研究,并且原位拉脱试验表明,最初在PCC和AC层之间建立了良好的粘结。几种非破坏性测试(NDT)方法表明,BCOA平板的遇险可能与PCC-沥青界面处的可能脱胶有关。本文主要关注APT结果以及具有不同覆盖层厚度的BCOA测试部分的性能。原位拉断试验表明,最初在PCC和AC层之间建立了良好的粘结。几种非破坏性测试(NDT)方法表明,BCOA平板的遇险可能与PCC-沥青界面处的可能脱胶有关。本文主要关注APT结果以及具有不同覆盖层厚度的BCOA测试部分的性能。原位拉断试验表明,最初在PCC和AC层之间建立了良好的粘结。几种非破坏性测试(NDT)方法表明,BCOA平板的遇险可能与PCC-沥青界面处的可能脱胶有关。本文主要关注APT结果以及具有不同覆盖层厚度的BCOA测试部分的性能。

更新日期:2020-10-30
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