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Forensic laboratory tests to evaluate long-term performance of reclaimed asphalt pavements: Connecticut case study

机译：法医实验室测试以评估再生沥青路面的长期性能：康涅狄格州案例研究

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This paper presents the most significant findings from the forensic evaluation of the long-term cracking performance of asphalt mix designs on the six Long-term Pavement Performance Special Pavement Study (LTPP SPS)-9A sections on Route 2 in Connecticut. The experiment targeted the comparison of permeability, stiffness, and low-temperature behaviour of Marshall and Superpave mixes with various performance grades of binders and reclaimed asphalt pavement content. The laboratory tests included measuring hydraulic conductivity by a Flexible Wall Permeameter, dynamic complex modulus by the Asphalt Mixture Performance Tester (AMPT), creep compliance and tensile strength by Indirect Tension Test, and fracture properties by Semi-Circular Beam (SCB) test. The evaluation of field performance included analysis of deflection basins and back-calculated elastic moduli from Falling Weight Deflectometer data as well as visual evaluation of surface distresses, such as cracking and weathering.
机译：本文在康涅狄格州2号公路的六个长期路面性能特殊路面研究（LTPP SPS）-9A部分上，对沥青混合料设计的长期开裂性能进行法医评估，得出最重要的发现。该实验旨在比较马歇尔和Superpave混合料与各种性能等级的粘结剂和再生沥青路面含量的渗透性，刚度和低温性能。实验室测试包括通过挠性壁渗透仪测量水力传导率，通过沥青混合料性能测试仪（AMPT）测量动态复模量，通过间接拉伸测试测量蠕变柔度和拉伸强度，以及通过半圆梁测试（SCB）断裂特性。对现场性能的评估包括对偏转盆地的分析和根据落重偏转计数据进行反算的弹性模量，以及对表面应力（如开裂和风化）的视觉评估。

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