• Title, Summary, Keyword: Modified asphalt

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A Study on Field Applications of Polymer-Modified Warm Asphalt Concrete Mixture using Admixture (첨가제를 이용한 중온형 폴리머 개질 아스팔트 콘크리트 혼합물의 실용화 연구)

  • Kim, Nak-seok;Lee, Jin-goo;Park, Seok-soon
    • Journal of the Society of Disaster Information
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    • v.6 no.1
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    • pp.28-43
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    • 2010
  • This paper presents the field applications of polymer-modified warm asphalt mixture which can reduce the temperature during the production and field constructions. The amount of fuel consumptions and $CO_2$ diffusions can be reduced by much using the polymer-modified warm asphalt mixture instead of the conventional polymer-modified asphalt mixture. According to the research results, the polymer-modified warm asphalt mixture can be utilized without additional temperature increasement and performance sacrifice during the plant production and public service, respectively. As a result, it is considered that the application of the polymer-modified warm asphalt mixture has the potential of convenience in constructions management and reducing the environmental damages.

Emulsification of Asphalt Modified with Styrene Butadiene Rubber (SBR) and Styrene Butadiene Styrene (SBS); 1) Phase Stability Behavior and 2) Physical Properties

  • Lee, Eun-Kyoung
    • Elastomers and Composites
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    • v.54 no.4
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    • pp.335-344
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    • 2019
  • In this work, styrene butadiene rubber (SBR) and styrene butadiene styrene (SBS) were used to modify asphalt, resulting in SBR- and SBS-modified asphalt, respectively. The two modified asphalts were emulsified with a nonionic emulsifier (Span 60) and cationic emulsifiers (ID, DDA) and their phase stabilization was investigated via particle size, Zeta potential, and flow behavior analysis. With increasing amount of the mixed emulsifier, the particle size decreased, leading to an increase in viscosity. The shear thinning behaviors and Zeta potential values ranging from 35-65 mV were determined and remained considerably stable. In addition, the adhesion strength and compression strength of the SBR-and SBS-modified asphalt emulsion were evaluated via surface free energy examination. The remarkable adhesion and compression strengths were estimated when 5 phr ID and 6 phr DDA were added to the emulsified asphalt modified with SBR and SBS. Therefore ID and DDA, the two cationic surfactants, played significant roles in improving the dispersion and interfacial adhesion strength, resulting in the improved adhesion and compression strength of the emulsified asphalts modified with SBR and SBS.

Self-Healing Asphalt Prepared by using Ionic Epoxy Resin

  • Lee, Young-Jik;Seo, Jun-Young;Kim, Seo-Yeon;Lee, Seung-Hyun;Hong, Young-Keun
    • Elastomers and Composites
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    • v.50 no.3
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    • pp.167-174
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    • 2015
  • Anionic epoxy compound was synthesized and added to asphalt aiming to prepare self-healing asphalt. Epoxy-modified asphalt showed excellent modification effect and healing effect as well. The results revealed that with 5% addition of polymer the tensile strength, impact strength and complex shear modulus of the polymer-modified asphalt increased by 65%. 64% and 35%, respectively. It seems that high interaction occurs between polymer and asphalt matrix. Self-healing efficiency of the polymer-modified asphalt based on tensile strength showed 100%, comparing to 79% of straight asphalt. In impact experiment the polymer-modified asphalt showed 99% of healing efficiency, comparing to 77% of straight asphalt. In rheological experiment the polymer-modified asphalt showed 103% of healing efficiency, comparing to 72% of straight asphalt. It appears that the ionic bonding existing in epoxy polymers contributed to high values of self-healing efficiency. The polymer which has high intermolecular force fills the crack of the asphalt, pulling the opponent side each other, and so the original properties were restored.

Development and Evaluation of Polymer-Modified Asphalt Emulsions Used for Tack Coats (택코트용 폴리머 개질 유화아스팔트 개발 및 성능 평가)

  • Kim, Yeong Min;Im, Jeong Hyuk;Hwang, Sung Do
    • International Journal of Highway Engineering
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    • v.17 no.2
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    • pp.39-46
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    • 2015
  • PURPOSES: The objectives of this study were to develop a new polymer-modified emulsion for application to tack coats and to evaluate its properties by comparing it with other types of asphalt emulsions, with the goal of providing an enhanced tack coat material for use in construction. METHODS: Modified asphalt binders were developed from using SBS and SBR latex in the laboratory, and their fundamental properties, such as their penetration index and PG grade, were evaluated. Based on the properties, a new tack coat material was developed. To evaluate the newly developed asphalt emulsion, the bonding strength between the two layers of HMA was measured by applying a uniaxial tensile test and shear test. For the tests, a total of four different conditions were applied to the specimens, including the developed asphalt emulsion, latex modified asphalt emulsion, conventional asphalt emulsion, and non-tack coating. RESULTS AND CONCLUSIONS: Overall, the developed asphalt emulsion exhibits the best bonding strength behavior among all of the three types. Also, the two types of polymer-modified emulsions were found to be better for application for use as a tack coat than a conventional emulsion. Especially, at a high temperature ($50^{\circ}C$), the conventional asphalt emulsion no longer acts as a tack coating material. Therefore, the polymer-modified emulsion should be considered for application to tack coat construction during the summer.

Cost Analysis of Modified Asphalts using a Performance Based Fracture Criterion (공용성에 근거한 파괴기준을 이용한 개질 아스팔트 포장의 비용 효과 분석)

  • Kim, Boo-Il
    • International Journal of Highway Engineering
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    • v.7 no.4
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    • pp.49-56
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    • 2005
  • The effect of modified asphalts is evaluated by simple comparison of a single parameter (i.e., tensile strength, stiffness, etc.) between modified asphalt mixture and unmodified mixture. The use of a single parameter to evaluate the effect of modified asphalt must be questioned. Rather, a single unified framework that accounts for changes in key mixture properties is needed to effectively evaluate the modified asphalt mixtures. This study used a new performance-based fracture parameter as a single unified framework, the Energy Ratio (ER), for quantifying the effect of modified asphalts oil the fracture resistance of mixtures. The Energy Ratio was then used as a performance criterion for calculating the construction cost of two modified asphalt pavements (SBS and Crumb Rubber) and unmodified asphalt pavement. The results showed that the Energy Ratio of SBS modified asphalt was higher than those of crumb rubber and unmodified asphalt. Cost analyses indicated that the construction cost of the AC layer would be reduced by up to 24% by SBS modification. Based on the results, the Energy Ratio is capable of evaluating the effect of modified mixtures, and may form the basis of a promising fracture criterion for performance-based thickness design in asphalt pavements.

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Relative Property Evaluation of Pro-Environmental Warm Polymer-Modified Asphalt Binder (친환경형 중온 폴리머 개질 아스팔트 바인더의 상대적 물성 비교평가)

  • Kim, Nakseok;Lee, Jingoo
    • Journal of the Society of Disaster Information
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    • v.6 no.1
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    • pp.10-24
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    • 2010
  • In this paper, warm asphalt binder was proposed as a substitute for the polymer-modified asphalt binder to get higher viscosity than that of the polymer-modified at the same temperature. Performance grade test and rotational viscosity of warm asphalt binder were conducted to evaluate the property variations due to the addition of admixture. Research results showed that the viscosity of warm asphalt binder at $100^{\circ}C$ was similar to that of the conventional asphalt binder. The performance and durability of warm asphalt binder were also comparable to those of the polymer-modified. It is considered that the active applications of warm asphalt binder can reduce environmental damages due to less diffusions of carbon dioxide compared to the conventional.

Evaluation of Stripping and Rutting Properties of CRM Modified Asphalt Mixtures (CRM 개질아스팔트 혼합물의 소성변형 및 박리저항 특성)

  • Doh, Young-S.;Park, Tae-W.;Kim, Hyun-H.;Kim, Kwang-W.
    • International Journal of Highway Engineering
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    • v.9 no.4
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    • pp.149-158
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    • 2007
  • Evaluation of the asphalt mixture modified with crumb rubber modifier(CRM) was performed to estimate possibility of using it as a paying material. OACs(optimum asphalt content) of CRM modified asphalt mixtures by dry process and wet process were determined by Marshall mix design and Wheel tracking test and moisture susceptibility test by freezing and thawing were carried out with CRM modified asphalt mixtures at OACs. The results from these tests, resistance of permanent deformation of CRM modified asphalt mixtures were superior to one of AP-5 while showing very low resistance of moisture sensitivity by freezing and thawing. This means that CRM modified asphalt mixtures are very sensitive to freezing and thawing. However, CRM modified asphalt mixture with anti-stripping material showed high improvement to resistance of moisture susceptibility by freezing and thawing. Therefore, it is recommended that when CRM mixtures were used in domestic, CRM modified asphalt mixtures should be with prevention against freezing and thawing resistance by moisture susceptibility.

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Evaluation of Waste Tire Rubber Asphalt Concrete using Polymer Modified Binders (폴리머 개질 폐타이어 아스팔트 콘크리트의 특성 연구)

  • 김광우;이지용;오성균
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • pp.180-185
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    • 1998
  • The study was conducted to evaluate the fundamental properties of waste tire asphalt concretes using polymer modified hinder that were made by dry process. The specimens of four types of polymer modified asphalt concretes were prepared, then Marshall test and indirect tensile strength tests were performed on these samples. The results showed that polymer modified waste tire rubber asphalt concrete was acceptable for the material of asphalt pavement surface layer.

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A Studyon the Properties of Polymer-Modified Mortar Using Asphalt Emulsion (아스팔트 에멀젼을 혼입한 폴리머 시멘트 모르터의 특성에 관한 연구)

  • Jean, Woo-Sung;Song, Hun;Jo, Young-Kug;Soh, Yang-Seob
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.375-380
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    • 1997
  • The purpose of this study is to examine the properties of polymer-modified mortars using asphalt emulsion. The polymer-modified mortars using asphalt emulsion with various asphalt-cement ratios are prepared, and tested for flexural and compressive strengths, water absorption and permeability, carbonation, Cl ion penetration and chemical resistance. From the test results, the flexural and compressive strengths, water absorption and permeability, carbonation and Cl ion penetration depths of polymer-modified mortars using asphalt emulsion tend to be decreased with increasing asphalt-cement ratio, and chemical resistance is improved. It is evident that polymer-modified mortars using asphalt emulsion having an excellent properties as a waterproof and finish materials can be produced.

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Evaluation of Poisson's Ration of Polymer-Modified Asphalt Concretes (폴리머 개질 아스팔트 콘크리트의 푸아송비에 관한 실험적 연구)

  • 김광우
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.41 no.5
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    • pp.104-105
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    • 1999
  • This study was performend to examine Poisson's ration of polymer-modified asphalt concrete due to temperature variatino . Asphalt binder used in this study was an AC85-100, penetration grade of 85-100, and polymer for modifying asphalt were domestic LDPE(Low-density polyethylene) and SBS(Styrene-butadiene-styrene). Aggregate was a crushed gneiss which was most widely used in the middle part of Korea. Using these materias, asphalt mixture slab(340mm$\times$240mm$\times$80mm) with optimum asphalt content from mix design was made and cut into square pillar (80mm$\times$80mm$\times$160mm). Poisson's ration was measured in various temperture (-15$^{\circ}C$, -1$0^{\circ}C$, -5$^{\circ}C$,$0^{\circ}C$,5$^{\circ}C$,1$0^{\circ}C$ and 2$0^{\circ}C$) under the load of one axis repeated compression mode. Poisson's ration of normal asphalt polymer modified asphalt mixtures in normal temperatures. This indicated that AP mixture was more susceptible to temperature effects. From regression aalysis of experimental results, the difference of Poisson's ration between normal and low temperature showed that polymer modified asphalt mixture were lower than AP mixture except for SBS modified asplat mixture.

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