• Title/Summary/Keyword: concrete pavements

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Preliminary Investigation of Pavement Adjustment Concepts for Slab Thickness Deficiency in Portland Cement Concrete Pavement (콘크리트 포장의 슬래브 두께 손실에 대한 지불규정 기준 정립을 위한 기초연구)

  • Kim, Seong-Min;Rhee, Suk-Keun
    • International Journal of Highway Engineering
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    • v.9 no.2 s.32
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    • pp.141-151
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    • 2007

  • The current standards and specifications for the road pavement construction have been developed based on materials and construction methods. The pavements constructed in accordance with those specifications do not guarantee high performance of pavements since they do not consider long-term performance of pavements. Therefore, as part of the study to develop performance-based construction standards for pavements, the payment adjustment methods based on the pavement performance are currently being developed. This paper presents preliminary studies performed to develop the payment adjustment methods when there is deficiency in the concrete slab thickness that is one oi the most important factors for the pavement design and construction. First, the payment adjustment methods in USA were investigated. Then, the AASHTO failure equation, the relationship between slab thickness and stress, and the relationship between stress level and pavement life were employed to propose the payment adjustment concepts based on the pavement performance for the deficient slab thickness. The variation in the slab thickness according to measurement locations was investigated by taking cores. In addition, the measurement methods of slab thickness and the variation of measured thicknesses depending on performers were analyzed, and finally the methodology to develop the thickness deficiency ranges for the use in the payment adjustment methods was proposed.

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Structural Behavior of Concrete Pavement Due to Temperature Variations (온도변화에 의한 콘크리트 포장도로의 구조 거동 연구)

  • 조병완
    • Computational Structural Engineering
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    • v.4 no.2
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    • pp.95-102
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    • 1991

  • Some sections of concrete highway pavements have been viewed with great concern by highway officials and engineers due to the severe cracking and failure problems. This is mainly due to the traffic loads in addition to temperature variations between top and bottom of concrete slab, which cause the concrete slab to curl up and down depending on the thermal gradient, respectively. Subsequently, a major consideration was given to the derivation of stiffness matrix and equivalent nodal loads due to the uniform gravity load, temperature and shrinkage of concrete. And the structural behavior of concrete highway pavement due to the temperature variations throughout the nations has been emphasized.

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Durability of Concrete Reinforced by Polypropylene Fivers (합성섬유보강 콘크리트의 내구특성)

  • 박제선;정영화;윤경구;이주형
    • Proceedings of the Korea Concrete Institute Conference
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    • 1999.04a
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    • pp.449-454
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    • 1999

  • Pavement concrete subjected to severe environmental condition may be vulnerable to frost attack practically where de-icing chemicals are used. This study focused on the investigation of durability characteristics of pavement concrete incorporation polypropylene fibers and application feasibility of these into the pavements of local roads and highway. A series of labortory tests were performed with main experimental variable such as fiber types, fiber contents. and type of concrete mix. The test of compressive strength was executed as primary tests, before the durability tests such as a scaling resistance were performed. De-icing salt resistance test was progressed by recycling freeze and thaw in the presence of a 4% calcium chloride solution. The deteriorated surfaces were rated by visual inspection and the loss weight were measured at every 5 cycles.

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