Evaluation of the improved properties of SBR/weathered coal modified bitumen containing carbon black

被引：56

作者：

Zhang, Ji ^{[1
,2
]}

Wang, Junlong ^{[1
,2
]}

Wu, Yiqian ^{[1
,2
]}

Wang, Youpeng ^{[1
]}

Wang, Yunpu ^{[1
]}

机构：

[1] NW Normal Univ, Inst Polymers, Coll Chem & Chem Engn, Lanzhou 730070, Peoples R China

[2] NW Normal Univ, Coll Life Sci, Lanzhou 730070, Peoples R China

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2009年 / 23卷 / 07期

关键词：

Polymer modified bitumen; Weathered coal; SBR; Carbon black; Rheological properties;

D O I：

10.1016/j.conbuildmat.2008.12.020

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

One problem of polymer modified bitumens (PMBs) is the poor compatibility between polymer and bitumens. In this paper, the improved properties of bitumen binders containing various kinds of additive including styrene butadiene rubber (SBR), weathered coal (WC) and carbon black (CB) under different concentrations are investigated. To assess the effects of the type and concentration of the additive on classical properties of bitumen binders, the softening points, penetration, penetration index (PI), ductility and Fraass breaking points before and after RTFOT aging are tested. The dynamic mechanical analysis (DMA) of these binders before and after ageing had been characterized by dynamic shear rheometer (DSR) using a combination of temperature and frequency sweeps. With higher polymer concentrations, it produced a highly elastic network which increases the viscosity, complex modulus and elastic response of the PMBs, particularly at high service temperatures. However, ageing of PMBs tended to result in a decrease in the elastic response of the modified bitumens. It also has been confirmed that the morphology observed by optical microscopy and scanning electron microscope (SEM) revealed the compatibility among SBR, WC and bitumen. The storage stability of binder was also improved significantly. Crown Copyright (c) 2008 Published by Elsevier Ltd. All rights reserved.

引用

页码：2678 / 2687

页数：10

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