• Title/Summary/Keyword: 재생아스팔트

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Correlation of Binder GPC Characteristics and Mechanical Properties of Hot-Mix Recycled Asphalt Mixtures (재생혼합물의 바인더 GPC특성과 역학적 특성과의 상관성 연구)

  • Kim, Kwang-Woo;Hong, Sang-Ki;Cho, Mun-Jin;Doh, Young-Soo
    • International Journal of Highway Engineering
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    • v.7 no.1 s.23
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    • pp.11-20
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    • 2005

  • This study examined the correlation between mechanical properties and LMS(Large molecular size) of binders in hot-recycled asphalt mixtures. Hot-recycled asphalt mixtures were manufactured by various mixing methods. Laboratory tests including indirect tensile strength, wheel tracking test and Kim test were performed for each recycled mixture. Gel-permeation chromatography (GPC) analysis was performed for the binders coated on virgin and old (RAP) aggregates separately. For the purpose of binder aging analysis, a round-shaped virgin coarse aggregates (13mm gravel) were introduced in recycled mixtures. This makes possible to distinguish the virgin aggregates from RAP aggregates in recycled mixtures for GPC sampling. Results of GPC showed that there was significant difference in aging level between the binder coated on RAP and that of virgin aggregates in the same recycled mixture. Regression analysis was performed to correlate mechanical properties to LMS ratio. Results showed that most of the mechanical properties had relatively good correlation with LMS. This trend agree with LMS increase up to some degree, but fails for further LMS increase.

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Methodology for Modifying Aging Condition of Hot-mix Recycled Asphalt Mixture (가열 재생혼합물의 노화특성 개선을 위한 연구)

  • Kim, Kwang-Woo;Hong, Sang-Ki;Lee, Gi-Ho;Doh, Young-Soo
    • International Journal of Highway Engineering
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    • v.7 no.1 s.23
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    • pp.1-9
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    • 2005

  • This is a basic research for producing hot-mix recycled asphalt mixtures and suggesting methods for solving quality problems, if any. Various mixing methods are introduced to mate aging evenly between old and virgin aggregates and to improve aging conditions. Gel-permeation chromatography(GPC) analysis was performed to evaluate aging of binders coated on coarse aggregates and a matrix separately. Round-shaped aggregates(13m gravel) were used in manufacturing mixtures for analysis of aging levels in recycled mixtures. It was found out that there was significant difference in aging levels between the binder coated on RAP's coarse aggregates and on virgin aggregates in a recycled mixture. The difference in the aging level was reduced by modifying mixing method(RAP and virgin binders were mixed first and then virgin aggregates were introduced). Among A to E mixing methods studied, the D was turned out to be the best.

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