• Title/Summary/Keyword: Asphalt Binder

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Evaluation of Lubrication Characteristics of WMA Additives for Different Roughnesses of Aggregate Surfaces and Film Thicknesses of Binders at a Compaction Temperature (다짐온도에서 골재 거칠기와 아스팔트 피막두께에 따른 중온화 첨가제의 윤활특성 평가)

  • Lee, Sang Jae;Cho, Dong-Woo;Hwang, Sung-Do;Rhee, Suk Keun
    • International Journal of Highway Engineering
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    • v.15 no.5
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    • pp.1-9
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    • 2013

  • PURPOSES : This study is to develop a method to evaluate lubrication of asphalt binder using WMA additives and compare their lubrication effects on two types of WMA additives and three types of asphalt film thicknesses. METHODS : This study is based on laboratory experiments and rheological analysis of the experimental results. Testing materials are aggregate diskes, asphalt, and WMA additives. The main testing method is stress sweep test by using dynamic shear rheometer (DSR). RESULTS : Sasobit gives more lubrication effects on film thicknesses 0.2mm and under but LEADCAP does on film thicknesses over 0.3mm. CONCLUSIONS : LVE-Limit is a better parameter to discern the lubrication effects on the thin film asphalt thickness. Both Sasobit and LEADCAP WMA additives provide effective lubrication at the compaction temperature.

  • https://doi.org/10.7855/IJHE.2013.15.5.001 인용 PDF KSCI

A Study on the Performance Comparison of the Agents for Asphalt Pavement Recycling (재생 아스팔트 첨가제의 성능비교 연구)

  • Kim, In-Soo;Kang, Min-Soo;Suh, Young-Chan;Lee, Bong-Won
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.6 no.4
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    • pp.82-88
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    • 2012

  • The usage of recycling agent is the most effective way of enhancing the performance of recycled asphalt pavement. Generally, many countries accepted these recycling agents retarding the various types of cracks resulted in binder aging. Contrary to such general tendency, recycling agents are used as very small amount in domestic recycling plant. The main reason of this is relatively high price of recycling agent. Even though agent price is high, agent can be a effective and economical way of alternative in asphalt recycling. In this study, penetration and softning point test performed by using RTFO(Rolling Thin Film Oven) aged binder. And, PG(Performance Grade) at high temperature, fatigue and MSCR(Multi Stress Creep and Recovery) tests exercised. The oil type agent is worked well to retrieving target penetration number. In PG test, $G^*/sin{\delta}$ of agents identically showed high value and polymer type agent is good at recovery value.

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Evaluation of Applicability of Heavy Oil Upgrading By-Product (Pitch) as A Pavement Paving Material (중질유 고도정제 부산물의 도로포장용 역청재료로서의 적용성 평가)

  • Yang, Sung Lin
    • International Journal of Highway Engineering
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    • v.16 no.5
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    • pp.9-18
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    • 2014

  • PURPOSES : The objective of this study is to evaluate the applicability of the pitch, which is produced during SDA petroleum upgrading process, as a pavement paving material. In order for the purpose, the physical and chemical properties of the pitch are analyzed, and then the various plasticizers are applied in the pitch. METHODS : Two types of pitch are selected from oil refinery companies, which are owned the SDA petroleum upgrading process. Also, two types of asphalt binders, PG 64-22 and PG 58-22, are employed to compare with the pitch because these two types of asphalt binders are currently used as paving materials. For the chemical property of the pitch, the composition of SARA (Saturate, Aromatic, Resin, Asphaltene), the elementary composition, and the functional group are analyzed. For the physical property of the pitch, the basic material property tests, such as penetration test, softening point test, flash point test, ductility test, and rotational viscometer test, are performed. Also, the DSR (Dynamic Shear Rheometer) test and the BBR (Bending Beam Rheometer) test are conducted using asphalt binder specimens obtained by both short term aging (Rolling Thin Film Oven, RTFO) and long term aging (Pressure Aging Vessel, PAV) processes. The rheological property of each pitch type is evaluated as a function of temperatures and loading cycles. PG 64-22 asphalt binder is used as a control material. RESULTS AND CONCLUSIONS : The Pitch may not be suitable for the pavement paving material without modifications, but the pitch can be used as alternatives of modified addictive or asphalt. If low molecular component, such as saturate and aromatic components, are added in the pitch based on the development of various plasticizers, it has a strong possibility for the pitch to be used as a alternative. However, in order to verify the performance property of the pitch, further research is needed.

  • https://doi.org/10.7855/IJHE.2014.16.5.009 인용 PDF KSCI

Mechanical characteristics of CRM asphalt (CRM아스팔트의 바인더특성 분석)

  • Lee, Kyung ha
    • International Journal of Highway Engineering
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    • v.2 no.1
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    • pp.123-133
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    • 2000

  • The asphalt mixture with CRM(Crumb Rubber Modifier) is known to show a better performance in resisting thermal cracking, fatigue cracking, and rutting compared with the conventional mixture. In this research, the lab tests on the physical and the mechanical characteristics of the domestic crumb rubber modified asphalt binder and conventional asphalts (AP-3, AP-5) were conducted. The physical test results show that CRM asphalt has better physical characteristics than that of conventional asphalts. The dynamic shear rheometer test results in high temperature show that CRM asphalt has higher complex shear modulus and aging resistance than those of conventional asphalts. And, the bending beam rheometer in low temperature test results show that CRM asphalt has higher resistance to thermal cracking than that of conventional asphalts.

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