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Use of the Multiple Stress Creep Recovery (MSCR) Test Method to Characterize Polymer-Modified Asphalt Binders

机译:使用多重应力蠕变恢复(MSCR)测试方法来表征聚合物改性的沥青粘合剂

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摘要

Use of polymer-modified binder has become much more important in recent years to enhance the durability and strength of asphalt concrete (AC) pavements in order to sustain higher traffic volumes, heavier loads, and extreme weather conditions. Unlike neat (unmodified) asphalt binders, polymer-modified binders are sensitive to the applied stress levels and show a nonlinear response in rutting factor and phase angle. The widely used dynamic shear rheometer (DSR) test (AASHTO T315) is not sufficient to capture viscoelastic properties of polymer modified-asphalt binders. Thus, state transportation agencies often need to conduct additional expensive and time consuming "PG Plus" tests (e.g., elastic recovery (ER), force ductility, toughness, and tenacity) for characterizing polymer-modified binders. Multiple stress creep recovery (MSCR), a recently introduced test method (AASHTO TP 70) for measuring high temperature properties of an asphalt binder, is expected to replace the existing AASHTO T315 for short-term aged binder. In the current study, MSCR and Superpave tests were conducted on three commonly used performance grade (PG) binders (PG 64-22, PG 70-28, and PG 76-28) from 12 different sources throughout Oklahoma. Based on expected traffic loads and service temperatures, the tested binder samples were graded in accordance with the MSCR grading system. The non-recoverable creep compliance (J_(nr)) and MSCR % recovery values obtained from the MSCR tests were then analyzed using the polymer curve and quadrant methods to assess the feasibility of the adoption of the MSCR test method for conditions prevailing in Oklahoma. Findings of this study reveal that the MSCR test method can be used to characterize polymer-modified binders without penalizing suppliers or risking the users.
机译:近年来,使用聚合物改性的粘合剂变得越来越重要,以增强沥青混凝土(AC)路面的耐久性和强度,以维持更高的交通量,更重的载荷以及极端的天气条件。与纯(未改性)沥青粘合剂不同,聚合物改性粘合剂对所施加的应力水平敏感,并且在车辙因子和相角方面显示出非线性响应。广泛使用的动态剪切流变仪(DSR)测试(AASHTO T315)不足以捕获聚合物改性沥青粘合剂的粘弹性质。因此,州运输机构经常需要进行额外的昂贵且费时的“ PG Plus”测试(例如,弹性回复率(ER),力延展性,韧性和韧性),以表征聚合物改性的粘合剂。多重应力蠕变回复率(MSCR)是一种最新引入的用于测量沥青粘合剂高温性能的测试方法(AASHTO TP 70),有望取代用于短期老化粘合剂的现有AASHTO T315。在当前的研究中,从俄克拉荷马州的12个不​​同来源对三种常用的性能等级(PG)粘合剂(PG 64-22,PG 70-28和PG 76-28)进行了MSCR和Superpave测试。根据预期的交通负荷和使用温度,根据MSCR分级系统对测试的粘结剂样品进行分级。然后使用聚合物曲线和象限方法分析了从MSCR测试获得的不可恢复的蠕变柔量(J_(nr))和MSCR%恢复值,以评估在俄克拉荷马州普遍存在的条件下采用MSCR测试方法的可行性。这项研究的发现表明,MSCR测试方法可用于表征聚合物改性的粘合剂,而不会惩罚供应商或给用户带来风险。

著录项

  • 来源
    《Journal of testing and evaluation》 |2016年第1期|507-520|共14页
  • 作者单位

    Department of Civil Engineering, AR State Univ., PO Box 1740, LSW#239, State University, AR 72467;

    School of Civil Engineering and Environmental Science, The Univ. of Oklahoma, 202 West Boyd Street, CEC #334, Norman, OK 73019;

    School of Civil Engineering and Environmental Science, and Alumni of Petroleum and Geological Engineering, College of Engineering, The University of Oklahoma, 202 West Boyd Street, CEC #334, Norman, OK 73019;

    Oklahoma Department of Transportation, 200 NE 21st Street, Oklahoma City, OK 73105;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    elastic recovery; rutting; mscr; creep compliance; non-recoverable strain;

    机译:弹性恢复;车辙mscr;蠕变顺应性;不可恢复的应变;
  • 入库时间 2022-08-17 13:31:52

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