| Related citation: | Yunliang Li,Yuze Liu,Lei Xu,Xin He,Haijiao Sun.Aging Behavior and Creep Characteristics of CACB[J].Journal of Harbin Institute Of Technology(New Series),2020,27(2):19-26.DOI:10.11916/j.issn.1005-9113.19043. |
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| Author Name | Affiliation | | Yunliang Li | School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China | | Yuze Liu | School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China | | Lei Xu | School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China | | Xin He | School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China | | Haijiao Sun | School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China |
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| Abstract: |
| Cement asphalt composite binder (CACB) is a type of composite binder composed of cement, asphalt, water, and various additives through curing, whose creep properties are influenced by asphalt aging. By CACB creep tests at various aging times, the creep compliance curves of the material were obtained. Curves of the test results were fitted by the creep compliance of Burgers model revised by fractional derivative, and the effects of asphalt aging and mix proportions on the CACB creep properties were analyzed. This study demonstrates that as aging time increased, the ability of the CACB to resist instant elastic deformation and viscous flow deformation was enhanced, the amount of its elastic components increased but the viscous components were reduced, and the material deformability decreased, exhibiting deforming properties similar to elastic materials. The effects of asphalt aging on the CACB viscoelastic mechanical properties were great during the initial aging stage (within 12 h) and became weaker during the later aging stage (over 12 h). During the initial aging stage, the CACB creep deformability could be enhanced by increasing asphalt application. However, during the later aging stage, asphalt application had little effect on creep deformability. |
| Key words: cement asphalt composite binder aging creep viscoelastic properties |
| DOI：10.11916/j.issn.1005-9113.19043 |
| Clc Number:U414.2 |
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| Descriptions in Chinese: |
| 沥青老化对水泥沥青复合胶结料蠕变特性的影响研究 李云良, 刘钰泽, 徐垒, 何鑫, 孙海蛟 (哈尔滨工业大学交通科学与工程学院, 哈尔滨, 150090) 中文摘要：水泥沥青复合胶结料是由水泥、沥青及多种外加剂胶结固化形成的复合胶结材料，沥青的老化会对水泥沥青复合胶结料的蠕变特性产生影响。通过水泥沥青复合胶结料不同老化程度下的蠕变试验得到其蠕变柔量，结合分数导数修正博格斯模型的蠕变柔量进行了试验结果的曲线拟合，分析了沥青老化及材料配比等因素对水泥沥青复合胶结料蠕变特性的影响。研究表明，随着沥青老化时间的增加，复合胶结料抵抗瞬时弹性变形及粘性流动变形的能力增强，弹性成分增加而粘性成分减少，材料的变形能力变差，呈现出弹性材料的变形特性。在老化初期（老化时间小于12h），沥青老化对复合胶结料的黏弹性力学性能影响较大，而在老化后期（老化时间大于12h），沥青老化对复合胶结料的黏弹性力学性能影响较小。在老化初期，提高沥青用量可以增强复合胶结料的蠕变变形能力；在老化后期，沥青含量对复合胶结料的蠕变变形能力影响较小。 关键词：水泥沥青复合胶结料；老化；蠕变；黏弹性。 创新点说明：（1）建立了考虑老化的水泥沥青复合胶结料黏弹性本构模型； （2）基于本构模型参数建立了水泥沥青复合胶结料的老化表征方法与指标。 |
