Microstructure and Meso-Mechanical Properties of Asphalt Mixture Modified by Rubber Powder under a Multi-Scale Effect

The applications of rubber-modified asphalt and its mixtures have received widespread attention due to the environmental and economic benefits of such materials. However, studies on the structural performance of rubber-powder-modified asphalt pavement are only concentrated on a certain scale, leadin...

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Autores principales:	Sanqiang Yang, Shuang Sun, Lusheng Qin, Qian Li
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	rubber-powder-modified asphalt multi-scale evaluation viscoelasticity Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/7ebcf126f40649519596bb409a4e4b0c
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id	oai:doaj.org-article:7ebcf126f40649519596bb409a4e4b0c
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spelling	oai:doaj.org-article:7ebcf126f40649519596bb409a4e4b0c2021-11-25T17:16:00ZMicrostructure and Meso-Mechanical Properties of Asphalt Mixture Modified by Rubber Powder under a Multi-Scale Effect10.3390/coatings111113212079-6412https://doaj.org/article/7ebcf126f40649519596bb409a4e4b0c2021-10-01T00:00:00Zhttps://www.mdpi.com/2079-6412/11/11/1321https://doaj.org/toc/2079-6412The applications of rubber-modified asphalt and its mixtures have received widespread attention due to the environmental and economic benefits of such materials. However, studies on the structural performance of rubber-powder-modified asphalt pavement are only concentrated on a certain scale, leading to research on the structural performance of pavement mostly focusing on mechanical responses at a macro scale. Therefore, the present study adopts the concept of multi-scale research to analyze the viscoelasticity of high-dosage-modified asphalt and its mixtures at a microscopic scale from the perspective of meso-mechanical analysis. In this paper, to ensure the overall durability of a structure, the effective asphalt film thickness and coarse aggregate angularity index of the test material were measured first. The viscoelasticity of asphalt modified with rubber powder was then analyzed using a Brinell viscosity test, scanning electron microscopy (SEM), and a dynamic shear rheometer (DSR). We determined the optimal amount of rubber powder to be 30%. A universal testing machine was used to study the influence of different temperatures and loading frequencies on the viscoelastic properties of different asphalt mixtures. Research on the dynamic modulus found that the incorporation of rubber powder increases the elastic properties of the mixture such that the rubber-powder-modified asphalt mixture had a higher dynamic modulus. At the same time, the high-dosage-modified asphalt mixture was found to be closer to an elastomer under a low temperature and high frequency. At a high temperature and low frequency, the asphalt mixture changed into a viscoelastic body whose viscous properties were mainly affected by the asphalt binder. The addition of rubber powder changed the temperature sensitivity of the asphalt and then affected the viscoelastic properties of the asphalt mixture.Sanqiang YangShuang SunLusheng QinQian LiMDPI AGarticlerubber-powder-modified asphaltmulti-scale evaluationviscoelasticityEngineering (General). Civil engineering (General)TA1-2040ENCoatings, Vol 11, Iss 1321, p 1321 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	rubber-powder-modified asphalt multi-scale evaluation viscoelasticity Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	rubber-powder-modified asphalt multi-scale evaluation viscoelasticity Engineering (General). Civil engineering (General) TA1-2040 Sanqiang Yang Shuang Sun Lusheng Qin Qian Li Microstructure and Meso-Mechanical Properties of Asphalt Mixture Modified by Rubber Powder under a Multi-Scale Effect
description	The applications of rubber-modified asphalt and its mixtures have received widespread attention due to the environmental and economic benefits of such materials. However, studies on the structural performance of rubber-powder-modified asphalt pavement are only concentrated on a certain scale, leading to research on the structural performance of pavement mostly focusing on mechanical responses at a macro scale. Therefore, the present study adopts the concept of multi-scale research to analyze the viscoelasticity of high-dosage-modified asphalt and its mixtures at a microscopic scale from the perspective of meso-mechanical analysis. In this paper, to ensure the overall durability of a structure, the effective asphalt film thickness and coarse aggregate angularity index of the test material were measured first. The viscoelasticity of asphalt modified with rubber powder was then analyzed using a Brinell viscosity test, scanning electron microscopy (SEM), and a dynamic shear rheometer (DSR). We determined the optimal amount of rubber powder to be 30%. A universal testing machine was used to study the influence of different temperatures and loading frequencies on the viscoelastic properties of different asphalt mixtures. Research on the dynamic modulus found that the incorporation of rubber powder increases the elastic properties of the mixture such that the rubber-powder-modified asphalt mixture had a higher dynamic modulus. At the same time, the high-dosage-modified asphalt mixture was found to be closer to an elastomer under a low temperature and high frequency. At a high temperature and low frequency, the asphalt mixture changed into a viscoelastic body whose viscous properties were mainly affected by the asphalt binder. The addition of rubber powder changed the temperature sensitivity of the asphalt and then affected the viscoelastic properties of the asphalt mixture.
format	article
author	Sanqiang Yang Shuang Sun Lusheng Qin Qian Li
author_facet	Sanqiang Yang Shuang Sun Lusheng Qin Qian Li
author_sort	Sanqiang Yang
title	Microstructure and Meso-Mechanical Properties of Asphalt Mixture Modified by Rubber Powder under a Multi-Scale Effect
title_short	Microstructure and Meso-Mechanical Properties of Asphalt Mixture Modified by Rubber Powder under a Multi-Scale Effect
title_full	Microstructure and Meso-Mechanical Properties of Asphalt Mixture Modified by Rubber Powder under a Multi-Scale Effect
title_fullStr	Microstructure and Meso-Mechanical Properties of Asphalt Mixture Modified by Rubber Powder under a Multi-Scale Effect
title_full_unstemmed	Microstructure and Meso-Mechanical Properties of Asphalt Mixture Modified by Rubber Powder under a Multi-Scale Effect
title_sort	microstructure and meso-mechanical properties of asphalt mixture modified by rubber powder under a multi-scale effect
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/7ebcf126f40649519596bb409a4e4b0c
work_keys_str_mv	AT sanqiangyang microstructureandmesomechanicalpropertiesofasphaltmixturemodifiedbyrubberpowderunderamultiscaleeffect AT shuangsun microstructureandmesomechanicalpropertiesofasphaltmixturemodifiedbyrubberpowderunderamultiscaleeffect AT lushengqin microstructureandmesomechanicalpropertiesofasphaltmixturemodifiedbyrubberpowderunderamultiscaleeffect AT qianli microstructureandmesomechanicalpropertiesofasphaltmixturemodifiedbyrubberpowderunderamultiscaleeffect
_version_	1718412540668542976

Microstructure and Meso-Mechanical Properties of Asphalt Mixture Modified by Rubber Powder under a Multi-Scale Effect

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