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首页> 外文期刊>Journal of Solid Waste Technology and Management >A STUDY TO EVALUATE LOW TEMPERATURE PERFORMANCE OF RECLAIMED ASPHALT PAVEMENT IN HOT MIX ASPHALT A T DIFFERENT DEGREES OF BLENDING
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A STUDY TO EVALUATE LOW TEMPERATURE PERFORMANCE OF RECLAIMED ASPHALT PAVEMENT IN HOT MIX ASPHALT A T DIFFERENT DEGREES OF BLENDING

机译：不同掺合度的热混合沥青再生沥青路面低温性能评价研究。

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摘要

Currently New Jersey state specifications limit the percentage of Reclaimed Asphalt Pavement to 15 percent for surface courses and 25 percent for the intermediate and base courses. The limitations are placed because the interaction between the virgin and RAP binder is unknown in two ways. First, the amount of residual binder that is active in a mix, known as degree of blending, is currently assumed to be 100 percent. Second, the effect that this blended binder will have on performance still needs to be investigated due to the fact that aged binder has a tendency to be stiffer. The low temperature performance was evaluated through the use of the disc shaped compacted tension test, modified bending beam rheometer, and tensile strength ratio test. These tests were performed on 25 and 35 percent RAP samples as well as a control mix and RAP samples from Delaware to determine if the current specifications for degree of blending should be altered and if the amount of RAP can be increased. It was found that the assumption of full blending could lead to under-asphalting and decreased performance for 25 percent RAP. The use of softer binders to compensate for higher percentages of RAP can raise the fracture energy of a given mixture; however, it will also decrease the stiffness of the mixture due to partial degree of blending. The high RAP mixtures that fractionated the RAP and had an overall finer gradation appeared to have higher fracture energy and higher stiffness in the modified bending beam rheometer.
机译：目前，新泽西州的规范将再生沥青路面的百分比限制为地面路线的15％，中级和基础路线的25％。之所以有这些限制，是因为原始和RAP黏合剂之间的相互作用在两个方面都是未知的。首先，目前认为混合物中有活性的残留粘合剂的量为100％（共混度）。其次，由于老化的粘合剂趋于变硬，这一混合粘合剂对性能的影响仍需研究。通过使用盘状压紧拉伸试验，改进的弯曲梁流变仪和拉伸强度比试验评估了低温性能。这些测试是在25％和35％的RAP样品以及来自特拉华州的对照混合物和RAP样品上进行的，以确定是否应更改当前的混合度规格以及是否可以增加RAP的量。结果发现，对于25％的RAP，完全混合的假设可能导致沥青混合料不足并降低性能。使用较软的粘合剂来补偿较高百分比的RAP可以提高给定混合物的断裂能。但是，由于部分混合，它也会降低混合物的刚度。在改良的弯曲梁流变仪中，将RAP分级并具有更精细渐变的高RAP混合物似乎具有更高的断裂能和更高的刚度。

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    Alan Norton; Darren Reger; Eric DuBois; Dan Kehr; Aaron Nolan; Yusuf A. Mehta;

  • 作者单位

    Department of Civil and Environmental Engineering, Rowan University Glassboro, NJ 08028, USA;

    Department of Civil and Environmental Engineering, Rowan University Glassboro, NJ 08028, USA;

    Department of Civil and Environmental Engineering, Rowan University Glassboro, NJ 08028, USA;

    Department of Civil and Environmental Engineering, Rowan University Glassboro, NJ 08028, USA;

    Department of Civil and Environmental Engineering, Rowan University Glassboro, NJ 08028, USA;

    Department of Civil and Environmental Engineering, Rowan University Glassboro, NJ 08028, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Recycling; Reclaimed Asphalt Pavement; Stiffness; Fracture Energy;

    机译：回收;再生沥青路面;刚性;断裂能;

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