Affiliation:
1. Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada
2. Department of Civil and Environmental Engineering, Manhattan College, Bronx, NY 10471, USA
Abstract
Using geopolymer as a modifier for asphalt binders and mixtures gained momentum for investigation in recent decades. Limited research investigations attempted to link the effect of temperature and traffic loading on the rheological properties and performance of geopolymer-modified asphalt binders. The primary objective of this study is to evaluate the effect of fly ash-based geopolymer (GF), styrene-butadiene-styrene (SBS), and the combination of GF with SBS on the rheological properties and performance of asphalt binders at low and intermediate temperatures. The rheological properties and performance of neat and modified asphalt binders (4%GF, 8%GF,12%GF, 2%SBS, and hybrid (2%SBS+8%GF)) were evaluated utilizing dynamic shear rheometer (DSR) and bending beam rheometer (BBR) devices. To evaluate the fatigue resistance of asphalt binders, the linear amplitude sweep (LAS) and viscoelastic continuum damage (VECD) models were applied. The dynamic or complex modulus and moisture damage resistance were measured to investigate the influence of modifiers on the performance of asphalt mixtures. The findings demonstrated that for both unaged and RTFO-aged asphalt binders, additives reduced the temperature sensitivity of both G′ and G″. When the binders were exposed to long-term aging using a pressure aging vessel (PAV), it was noticed that the 8%GF binder became more susceptible to temperature changes. The 2%SBS binder had the lowest creep stiffness compared with the neat and other modifiers, while the hybrid binder exhibited the highest resistance to fatigue distress at different temperatures compared with the other binders. The modified asphalt mixes (8%GF, 2%SBS, and hybrid) achieved the maximum tensile strength (St) compared with the neat asphalt binder, with an increase of more than 80%. The St increased from 580.4 kPa to 740.4 kPa, 884.8 kPa, and 917.4 kPa by utilising the 8%GF, 2%SBS, and hybrid binders, respectively. Furthermore, the modified asphalt mixture exhibited more ability to resist cracking, attaining the highest fracture energy in dry and freeze-thaw conditions.
Funder
Natural Sciences and Engineering Research Council of Canada
Subject
General Materials Science
Reference61 articles.
1. Farag, K.M.H. (2010). Evaluation of Fatigue Resistance for Modified Asphalt Concrete Mixtures Based on Dissipated Energy Concept. [Ph.D. Thesis, Technische Universität Darmstadt].
2. Applicability of Superpave binder testing protocols to modified binders;Bahia;Transp. Res. Rec. J. Transp. Res. Board,1997
3. Influence of polymer modification on asphalt binder dynamic and steady flow viscosities;Cardone;Constr. Build. Mater.,2014
4. Rheological Evaluation of Ethylene Vinyl Acetate Polymer Modified Bitumens;Airey;Constr. Build. Mater.,2002
5. PIXE, PIGE and NMR study of the masonry of the pyramid of Cheops at Giza;Demortier;Nucl. Instruments Methods Phys. Res. Sect. Beam Interact. Mater. Atoms,2004
Cited by
8 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献