• Title/Summary/Keyword: 콘크리트용

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A Study on the Properties of Recycled Concrete Using Recycled Fine Aggregates with different Removal formulas of Powder In Aggregate (미분 제거방식이 다른 2종의 재생 잔골재가 콘크리트외 특성에 미치는 영향)

  • Lee Mun-Hwan;Lee Sea-Hyun;Shim Jong-Woo
    • Journal of the Korea Concrete Institute
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    • v.17 no.1 s.85
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    • pp.95-104
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    • 2005

  • The research conducted to study the potential practicability of recycled aggregate concrete by analyzing the characteristics of concretes made of recycled quality aggregates produced by wet and dry process has found the following results. The air content of recycled aggregate concrete increased with increase of the substitut on rate due to mortar included while producing recycled aggregates. However, the concretes with aggregate produced by dry process had relatively low rate of increase in air content. The slump showed generally decreasing trend as the substitution rate of recycled aggregate increased regardless of the wet or dry process. It was assumed that the mortar particles remained in recycled aggregate absorbed the surplus hydration in concrete and decreased fluidity The compressive strength generally decreased as the substitution rate of recycled aggregate increased, however there was an increasing trend as well due to decreasing effect of water-cement ratio when the substitution rate of recycled aggregate reached 25, 50% after mix. This phenomena also appeared in early age, which meant that recycled aggregate concrete should not be retarded in setting when applied in the field. The tensile strength also reached the maximum when wet or dry recycled aggregate replaced with 25%. To conclude, recycled aggregates for concrete produced by wet or dry process are expected to demonstrate essential characteristics of concrete without significant decline in physical or dynamic quality when the substitution rate is below 25% although there are variations subject to water-cement ratio. However, slight differences are expected due to types of recycled aggregate and physical quality.

  • https://doi.org/10.4334/JKCI.2005.17.1.095 인용 PDF KSCI

Applicability of Color Bituminous Mixtures for Highway Pavement (차도용 칼라 역청 혼합물의 적용성 연구)

  • Doh, Y.S.;Oh, S.K.;Choi, Y.K.;Kim, K.W.
    • International Journal of Highway Engineering
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    • v.6 no.4 s.22
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    • pp.91-100
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    • 2004

  • This study was Performed to evaluate applicability of color flexible pavement concrete (CFPC) for motorway pavement. Color flexible pavement has been applied to non-motorway pavements, such as pedestrian and bicycle road. Two polymers were used to modify the binder and to strengthen the stiffness of pavement mixture. Waste paper was used to prevent the asphalt of gap-grade mixture from draining. Marshall properties, indirect tensile strength(ITS), tensile strength ratio(TSR) before and after freezing-and-thawing treatment and artificial aging, permanent deformation and fatigue life were measured. Color bituminous concrete mixtures used this study had nearly the same quality in mechanical properties when compared with conventional asphalt concrete mixtures manufactured with AP-3 and all mixtures satisfied with domestic specification for motorway pavement. Therefore, it is proved that the color bituminous concrete used this study can be applied for motorway pavement.

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