Strength-Improvement and Crack Resistance of High Volume Fly-Ash Concrete at Early Age

• Project/Area Number: 24760349
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Civil engineering materials/Construction/Construction management
• Research Institution: Yamaguchi University
• Principal Investigator: YOSHITAKE Isamu 山口大学, 理工学研究科, 准教授 (10335771)
• Project Period (FY): 2012-04-01 – 2014-03-31
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2013: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2012: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
• Keywords: フライアッシュ / ひび割れ / 温度応力 / 石灰石 / 断熱温度上昇量 / 熱膨張係数 / 石炭灰 / コンクリート / 耐久性 / リサイクル

Research Abstract

This study discusses numerical simulation of the thermal stress as well as experimental results establishing thermal and mechanical properties of high volume fly ash (HVFA) concrete of 50% replacement of cement by fly ash. To examine the crack resistance of the HVFA concrete at early age, a uniaxial tension test was performed and tensile properties such as tensile strength and tensile Young's modulus were quantified. Adiabatic temperature rise and CTE tests were also conducted to provide more evidence of the thermal properties. The thermal and mechanical properties of HVFA concrete were adopted in a Finite Element (FE) simulation. The numerical simulation confirmed the favorable thermal properties contributing to decrease of thermal stress.

Research Products

• [Journal Article] Tensile Properties of High Volume Fly-Ash (HVFA) Concrete with Limestone Aggregate (2013)
  • Author(s): Isamu YOSHITAKE, Hiroki KOMURE, Ayman Y. NASSIF and Sunao FUKUMOTO
  • Journal Title: Construction and Building Materials Volume: Vol.49 Pages: 101-109
  • DOI: 10.1016/j.conbuildmat.2013.08.020
  • Peer Reviewed
• [Journal Article] Uniaxial Tensile Strength and Tensile Young's Modulus of Fly-ash Concrete at Early Age (2013)
  • Author(s): Isamu YOSHITAKE, Wenbo ZHANG, Yoichi MIMURA and Tadashi SAITO
  • Journal Title: Construction and Building Materials Volume: Vol.40 Pages: 514-521
  • DOI: 10.1016/j.conbuildmat.2012.11.022
  • Peer Reviewed
• [Journal Article] 若材齢におけるフライアッシュコンクリートの引張ヤング係数に関する実験的検討 (2012)
  • Author(s): 沖本翔平,張文博,三村陽一,吉武勇
  • Journal Title: コンクリート工学年次論文集 Volume: Vol.34,No.1 Pages: 310-315
  • Peer Reviewed
• [Journal Article] 若材齢におけるフライアッシュコンクリートの引張ヤング係数に関する実験的検討 (2012)
  • Author(s): 沖本翔平・張 文博・三村陽一・吉武 勇
  • Journal Title: コンクリート工学年次論文集 Volume: 34 Pages: 310-315
  • Peer Reviewed
• [Presentation] Strength Properties of Fly-Ash Concrete Mixed with Limestone Powder (2013)
  • Author(s): Isamu YOSHITAKE, Yuya TOKIKUNI, Hiroki KOMURE and Sunao FUKUMOTO
  • Organizer: Proceedings of ISEC-7
  • Place of Presentation: ホノルル(米国)
  • Year and Date: 2013-06-19
• [Presentation] 石灰石骨材を用いたハイボリュームフライアッシュ(HVFA)コンクリートの熱膨張係数 (2013)
  • Author(s): 小牟禮宏樹,吉武勇,菖蒲泰啓,大西利勝
  • Organizer: 第67回セメント技術大会
  • Place of Presentation: ホテルメトロポリタン(東京池袋)
  • Year and Date: 2013-05-13
• [Presentation] Strength Properties of Fly-Ash Concrete Mixed with Limestone Powder (2013)
  • Author(s): Isamu YOSHITAKE, Yuya TOKIKUNI, Hiroki KOMURE, Sunao FUKUMOTO
  • Organizer: ISEC-7
  • Place of Presentation: Honolulu, Hawai
• [Presentation] 石灰石骨材を用いたハイボリュームフライアッシュ(HVFA)コンクリートの熱膨張係数 (2013)
  • Author(s): 小牟禮宏樹，吉武 勇，菖蒲泰啓，大西利勝
  • Organizer: 第67回セメント技術大会
  • Place of Presentation: ホテルメトロポリタン（東京都豊島区池袋）
• [Presentation] 石灰石骨材を用いたハイボリュームフライアッシュ(HVFA)コンクリートの熱膨張係数 (2013)
  • Author(s): 小牟禮宏樹・吉武 勇・菖蒲泰啓・大西利勝
  • Organizer: セメント技術大会
  • Place of Presentation: ホテルメトロポリタン(東京)
• [Presentation] STRENGTH PROPERTIES OF FLY-ASH CONCRETE MIXED WITH LIMESTONE POWDER (2013)
  • Author(s): 吉武 勇・時國裕也・小牟禮宏樹・福本 直
  • Organizer: ISEC-7
  • Place of Presentation: Honolulu, HW, USA
• [Presentation] Thermal Stress Analysis of Fly-ash Concrete with Cement Replacement Ratios up to 50% (2012)
  • Author(s): Mingjie MAO, Qiuning YANG, Wenbo ZHANG and Isamu YOSHITAKE
  • Organizer: Proceedings of ICETCE2012
  • Place of Presentation: 宜昌(中国)
  • Year and Date: 2012-05-18
• [Remarks] 研究業績－吉武勇
  • URL: http://www.concrete.civil.yamaguchi-u.ac.jp/yoshitake-papers-j.htm
• [Remarks] 吉武研究室 研究概要
  • URL: http://www.concrete.civil.yamaguchi-u.ac.jp/research-y.html