INFLUENCE OF FREEZING CONDITION AND SPECIMEN SIZE ON EVALUATION OF FROST-SUSCEPTIBILITY

土の凍上性評価に与える凍結方法および供試体寸法の影響

The freezing condition of the NEXCO standard frost heave test (NEXCO method) was improved with the objective of reducing the variation in the results. Also, a large diameter testing apparatus was produced with a diameter up to Φ150 mm to enable the JGS standard frost heave test (JGS method) to be applied to subgrade soil and base course material, and the effect of the difference in the test method and the specimen size on the frost heave test results was investigated. Stable results could be obtained by changing the freezing condition of the NEXCO method from an air cooled type to a refrigerant circulation type. No difference was seen between the results of the Φ150-JGS method and the Φ100-JGS method, which indicates that the effect of the increase in diameter is small.　NEXCO基準の凍上試験（NEXCO法）に対して，結果のばらつきを抑制するために凍結方法の改良を行った．また，JGS基準の凍上試験（JGS法）を路床土や路盤材にも適応できるようにφ150mmまで大口径化した試験装置を作製し，試験方法や供試体寸法の違いが凍上試験結果に及ぼす影響を調べた．NEXCO法は，凍結方法を空冷式から冷媒循環式に変更したことで安定した結果を得ることが可能となった．φ150mmのJGS法と一般に普及しているφ100mmのJGS法の結果に違いはみられず，大口径化した影響は少ないことが示された．NEXCO法とJGS法が非凍上性と判定する値は，ほぼ一致することが明らかとなった．しかし，両法が一致した結果を得られる範囲は，JGS法の凍上速度が0.2mm/h程度までであった．

• Record URL:
  https://doi.org/10.2208/jscejpe.69.I_191
• Summary URL:
  http://scholar.google.com/scholar_lookup?title=INFLUENCE+OF+FREEZING+CONDITION+AND+SPECIMEN+SIZE+ON+EVALUATION+OF+FROST-SUSCEPTIBILITY&author=S.+Kawabata&author=T.+Ishikawa&author=K.+TOYOTA&author=S.+YAMAUCHI&author=S.+Kameyama&publication_year=2013
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/21856559
• Authors:
  • Kawabata, Shinichiro
  • Ishikawa, Tatsuya
  • TOYOTA, Kunio
  • YAMAUCHI, Satoru
  • Kameyama, Shuichi
• Publication Date: 2013

Language

• English
• Japanese

Media Info

• Media Type: Web
• Pagination: pp I_191-I_198
• Serial:
  • Journal of Japan Society of Civil Engineers, Ser. E1 (Pavement Engineering)
  • Volume: 69
  • Issue Number: 3
  • Publisher: Japan Society of Civil Engineers
  • ISSN: 2185-6559
  • Serial URL: https://www.jstage.jst.go.jp/browse/jscejpe/-char/en

Subject/Index Terms

• TRT Terms: Base course (Pavements); Freezing; Frost heaving; Subgrade materials; Testing
• Subject Areas: Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I62: Winter Maintenance;

Filing Info

• Accession Number: 01545478
• Record Type: Publication
• Source Agency: Japan Science and Technology Agency (JST)
• Files: TRIS, JSTAGE
• Created Date: Nov 26 2014 3:05PM