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Study on Influence of Heat and Humidity on The Adhesive Performance of Base Mortar of External Wall.

Research Project

Project/Area Number 04452248
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field Building structures/materials
Research InstitutionOITA UNIVERSITY

Principal Investigator

NAGAMATSU Seiki  Oita University, Faculty of Engineering, Professor, 工学部, 教授 (70037828)

Co-Investigator(Kenkyū-buntansha) TAKEDA Yoshitsugu  Nishinippon Institute of Technology, Associate Professor, 工学部, 助教授 (70125160)
TAKANO Masamitsu  Oita University, Faculty of Engineering, Research Assistant, 工学部, 助手 (30206784)
SATO Yoshiaki  Oita University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (30038111)
Project Period (FY) 1992 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥4,200,000 (Direct Cost: ¥4,200,000)
Fiscal Year 1993: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1992: ¥3,700,000 (Direct Cost: ¥3,700,000)
KeywordsExternal Wall / Mortar / Adhesive Performance / Heat / Humidity / 加湿 / モルタル仕上げ / 繰り返し加熱・加湿 / 熱膨張率 / ひびわれ / 熱応力 / 温度分布 / モルタルの接着強さ
Research Abstract

In the sequence from last year, the experiments have been carried out on the concrete walls finished by mortar. Some of them have been heated upto 80゚C at the face by infrared lamps and cooled down to circumstane temperature (or+humidity) and others exposed out door.
The contact planes with mortar and concrete wall have been in two conditions, "normal" and "having partially pre-cracking" (Ref.fig-1, Type1).
In this year, additional experiments have been done. The specimens with pre-crackings (Type1,2) have been heated up as same as above and the behavior of pre-cracking have been inspected.
The exprimental results have been as follows ;
(1) The adhesive strength with mortar and concrete wall has been lowered 40% after a month in the case of only heating up.
(2) The drop in adhesive strength of "normal" was amaller in the case of (heating+giving humidity) than in the case of only heating. On the other hand, the drop in the adhesive of "pre-cracking Type-1" was much larger in the case of (heating+giving humidity) than in the case of only heating.
(3) The adhesive strength of "normal" have been lowered 7% after 90 days from exprimental start and that of "pre-cracking Type-1" have been lowred 37%.
(4) The cracking in mortar have been observed in all the specimens, especially the specimens with "pre-cracking Type-1" have had wider cracking.
(5) At the roots of "pre-cracking Type-1,2", the extention of that have ben observed. These are a mechanical reason of mortar pealing off concrete wall.
2) The temperrature distributions in the specimen which have been heated up infrared lamps have been analyzed by F.E.M.. The calculated results have agreed with the mesured temperature.
3) The calculation of stress distribution in the specimen have been carried out based on the temperature distribution calculated in item 2). They are shown that the enough magnitude of tensile stress for cracking to occur exists in mortar.

Report

(3 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • Research Products

    (4 results)

All Other

All Publications (4 results)

  • [Publications] 永松 静也: "モルタル仕上層の加熱・加湿による耐力低下についての研究" 第20回セメントコンクリート研究討論会. 57-62 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 永松 静也: "モルタル仕上層の加熱・加湿による耐力低下についての研究" 日本建築学会研究報告九州支部第34号・1構造系. 93-96 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 永松 静也: "モルタル仕上層の加熱・加湿による耐力低下についての研究" 第20回セメントコンクリート研究討論会. 57-62 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 永松 静也: "モルタル仕上げ層の加熱・加湿による耐力低下についての研究" 日本建築学会研究報告九州支部第34号・1構造系. 93-96 (1994)

    • Related Report
      1993 Annual Research Report

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Published: 1992-04-01   Modified: 2016-04-21  

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