지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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초록· 키워드
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PURPOSES : Hot-mix asphalt(HMA) concretes show a trend of strength increase at low temperature due to binder stiffness increase, but strength decrease below a ceratin low temperature. This is due to the differential thermal contraction(DTC) which is induced by a significant difference in coefficients of thermal contraction between aggregate and asphalt which is coated around the aggregate. This DTC damage is well known to occur in HMA concrete, but is not yet investigated in warm-mix asphalt(WMA) concretes. METHODS : To evaluate DTC damage on WMA in this study, the flexural strength($S_f$) of WMA concretes, which were produced at $30{\sim}40^{\circ}C$ lower temperature, was evaluated in comparison with that of HMA at -5, -15 and $-25^{\circ}C$. RESULTS : Most of WMA and HMA mixtures showed flexural strength increase down to $-15^{\circ}C$ and decrease below $-15^{\circ}C$. this type of strength reduction below $-15^{\circ}C$ can e explained as the effect of differential thermal contraction that is a consequence of the large difference in coefficients of thermal contraction between aggregate and asphalt. the property reduction of WMA is similar the result of previous works dealt with HMA mixtures. CONCLUSIONS : Even though there is some differences by materials used, the WMA concretes showed a significantly lower DTC damage than HMA concrete at low temperature at ${\alpha}$=0.05 level.
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참고문헌 (20)
참고문헌 신청
Anderson, K. O. / 1968 / Design and evaluation of asphalt concrete with respect to thermal cracking / Proceedings, AAPT, Minneapolis, Minnesota 37
CGRA Ad Hoc Committee / 1971 / Low-temperature pavement cracking in Canada : The problem and its treatment / Annu.Meeting, Canadian Good Road Association, Montreal, Quebec
El Hussein, M. H. / 1993 / Differential thermal expansion/contraction: A mechanistic approach to adhesion in asphalt concrete / Canadian Jounal of Civil Engineering 20(3):366~373
El Hussein, M. / 1998 / Assessment of localized damage associated with exposure to extreme low temperatures / Journal of Materials in Civil Engineering 10(4):269~274
Fabb, T. R. J. / 1974 / The influence of mix composition, binder properties and cooling rate on asphalt cracking at low temperatures / Proceedings, AAPT, Minneapolis, Minnesota
CGRA Ad Hoc Committee / 1971 / Low-temperature pavement cracking in Canada : The problem and its treatment / Annu.Meeting, Canadian Good Road Association, Montreal, Quebec
El Hussein, M. H. / 1993 / Differential thermal expansion/contraction: A mechanistic approach to adhesion in asphalt concrete / Canadian Jounal of Civil Engineering 20(3):366~373
El Hussein, M. / 1998 / Assessment of localized damage associated with exposure to extreme low temperatures / Journal of Materials in Civil Engineering 10(4):269~274
Fabb, T. R. J. / 1974 / The influence of mix composition, binder properties and cooling rate on asphalt cracking at low temperatures / Proceedings, AAPT, Minneapolis, Minnesota
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