コンクリート部材の断面厚さの相違が表層部脆弱層の形成に及ぼす影響  [in Japanese] EFFECTS ON FORMING OF FRAGILE LAYER OF SURFACE BY THICKNESS OF MEMBER SECTION OF CONCRETE  [in Japanese]

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Author(s)

    • 月永 洋一 TSUKINAGA Yoichi
    • 八戸工業大学 工学部土木建築工学科 HACHINOHE INSTITUTE OF TECHNOLOGY, Department of Civil and Architectural Engineering
    • 庄谷 征美 SHOYA Masami
    • 八戸工業大学 大学院工学研究科土木工学専攻 HACHINOHE INSTITUTE OF TECHNOLOGY, Graduate School of Engineering
    • 阿波 稔 ABA Minoru
    • 八戸工業大学 工学部土木建築工学科 HACHINOHE INSTITUTE OF TECHNOLOGY, Department of Civil and Architectural Engineering

Abstract

コンクリート表層には、ブリーディングや種々の環境条件により組織的に脆弱な層が形成され、内部コンクリートとの品質差を生じることが知られている。本研究では、この表層部脆弱層の形成に影響を及ぼす因子として、コンクリート部材の断面厚さに着目し実験的な検討を行った。本実験の結果から、部材断面の増加に伴って、脆弱層の形成に影響すると思われるブリーディングが増加し、型枠近傍において最も顕著となることを明らかにした。また、供試体の部材断面を大きくすることにより、スケーリング抵抗性や物質移動抵抗性が低下することを明らかとし、コンクリートの耐久性は、部材断面厚さの相違に起因して、大きな差異を生じることを示した。

A structural fragile layer is formed in the surface layer of concrete by the influence of the bleeding of fresh concrete and the environmental conditions. This fragile layer formed to the surface layer of concrete causes the difference in quality between the surface layer of concrete and the inside part of concrete. Authors aimed to the thickness of member section of a concrete material as the factor that influenced the formation of a fragile layer, and examined it experimentally. In this study, to examine the influence that the difference of the thickness of member section of concrete material exerted on the result of the durability, the test for bleeding of fresh concrete, rebound number test, the scaling test and the accelerated carbonation test were executed. Authors clarified the following from the results of an experimental examination. 1. The amount of the bleeding of fresh concrete that becomes the factor of the formation of a fragile layer was increased as the member section increases. 2. An increase in the amount of the bleeding of fresh concrete becomes remarkable near the formwork. 3. The scaling resistance and the material movement resistance decrease as the thickness of member section of specimen increases. As a result, authors clarified that durability of concrete changed greatly by the difference of the thickness of member section of concrete.

Journal

  • Cement Science and Concrete Technology

    Cement Science and Concrete Technology 64(1), 391-397, 2010

    Japan Cement Association

Codes

  • NII Article ID (NAID)
    130004574640
  • Text Lang
    JPN
  • ISSN
    0916-3182
  • Data Source
    J-STAGE 
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