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      Experimental Study on Nano-Parameters of Styrene-Butadiene-Styrene Block Copolymer Modified Bitumen Based on Atomic Force Microscopy

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          Abstract

          In this paper, an atomic force microscope (AFM) was used to study the nano-morphology characteristics of styrene-butadiene-styrene block copolymer (SBS) modified bitumen. The effects of SBS content and short-term aging on the nano-morphology parameters of bitumen were studied. The correlation between nano-morphology parameters and main pavement performances of SBS modified bitumen was analyzed. The results show that with the increase of SBS content, the average area of bee-like structure and the proportions of bee-like structure area of SBS modified bitumen increases gradually, the roughness of the whole image and the roughness of the lightweight component region decreases gradually, but the increasing or decreasing trend is no longer obvious when the content of SBS is more than 4%. The maximum height difference of SBS modified bitumen is linear with the content of SBS. The larger the content of SBS, the smaller the influence of short-term aging on the nano-morphology of SBS modified bitumen. The penetration degree will decrease and the softening point will increase with the increase of the proportion of bee-like structure area of SBS modified bitumen. The ductility will decrease with the increase of the roughness of the lightweight component region. The ductility and the Brookfield viscosity will increase with the increase of the maximum height difference. The research results provided a reference for defining quantifiable nano-parameters of SBS modified bitumen and establishing the relationship between nano-parameters and pavement performances.

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          New direct observations of asphalts and asphalt binders by scanning electron microscopy and atomic force microscopy

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            Influence of aging on the evolution of structure, morphology and rheology of base and SBS modified bitumen

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              Analysis of styrene-butadiene-styrene polymer modified bitumen using fluorescent microscopy and conventional test methods.

              This paper presents a laboratory study of modified bitumen containing styrene-butadiene-styrene (SBS) copolymer. Polymer modified bitumen (PMB) samples have been produced by mixing a 50/70 penetration grade unmodified (base) bitumen with SBS Kraton D1101 copolymer at five different polymer contents. The fundamental characteristics of the SBS PMB samples have been determined using conventional methods. The morphology of the samples as well as the percent area (%) distribution of SBS polymers throughout the base bitumen have been characterized and determined by means of fluorescence microscopy and Qwin Plus image analysis program, respectively. The mechanical properties of the hot-mix asphalt (HMA) containing SBS PMBs have also been analyzed and compared with HMA incorporating base bitumen. The effect of polymer addition on the short and long term aging characteristics of HMA have been evaluated by indirect tensile strength (ITS) test. The results indicated that polymer modification improved the conventional properties (penetration, softening point, etc.) and the mechanical properties (Marshall, ITS, etc.) of the base bitumen. It was also concluded that at low polymer contents, the samples revealed the existence of dispersed polymer particles in a continuous bitumen phase, whereas at high polymer contents a continuous polymer phase has been observed. Moreover, it was found out that the polymer addition minimizes the short and long term aging of HMA.
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                Author and article information

                Journal
                Polymers (Basel)
                Polymers (Basel)
                polymers
                Polymers
                MDPI
                2073-4360
                04 June 2019
                June 2019
                : 11
                : 6
                : 989
                Affiliations
                [1 ]School of Civil and Architectural Engineering, Shandong University of Technology, Zibo 255049, China
                [2 ]School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255049, China; wangfangsdut@ 123456163.com
                Author notes
                [* ]Correspondence: ziwuzizwg@ 123456sdut.edu.cn (W.Z.); sjun@ 123456sdut.edu.cn (J.S.); lzm_700@ 123456163.com (Z.L.); xiaofeiliangsdut@ 123456163.com (X.L.); Tel.: +86-0533-2789064 (W.Z.)
                Author information
                https://orcid.org/0000-0002-5480-5010
                Article
                polymers-11-00989
                10.3390/polym11060989
                6631913
                31167391
                0f388ed3-f48a-4019-bd1a-4d1100aa1b8e
                © 2019 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 16 April 2019
                : 16 May 2019
                Categories
                Article

                sbs modified bitumen,nano-parameters,atomic force microscope,pavement performances

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