Evaluation of fatigue behavior of hot mix asphalt mixtures prepared by bentonite modified bitumen

被引：47

作者：

Ziari, Hasan ^{[1
]}

Babagoli, Rezvan ^{[1
]}

Ameri, Mahmoud ^{[1
]}

Akbari, Ali ^{[1
]}

机构：

[1] Iran Univ Sci & Technol, Sch Civil Engn, Tehran 16846, Iran

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2014年 / 68卷

关键词：

Bentonite; Fatigue life; Four point beam fatigue test; Indirect tensile strength; Resilient modulus; CONCRETE; COMPOSITES; BINDERS; DAMAGE;

D O I：

10.1016/j.conbuildmat.2014.06.066

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The objective of this research study was to investigate and evaluate effects of bentonite on fatigue properties of hot mix asphalt (HMA) mixtures. The experimental program for this study included use of five percentages of bentonite (10%, 15%, 20%, 25% and 30%) by weight of bitumen for modifying base bitumen. Several tests such as: marshal stability, indirect tensile strength, resilient modulus and fatigue test were conducted. The fatigue tests were based on four-point bending test in strain-controlled mode at 3 micro-strain levels (600-800-1000 lm/m) with sinusoidal loading. The fatigue life of mixtures has been evaluated based on the 50% reduction of the initial stiffness modulus. The results show that fatigue life of asphalt mixtures prepared with bentonite modified bitumen is longer than conventional HMAs. Also, bentonite leads to relative increase in indirect tensile strength and resilient modulus of asphalt mixtures. Finally, based on experimental results, a model is proposed to describe the fatigue behavior of asphalt mixtures containing bentonite modified bitumen. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：685 / 691

页数：7

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