Development of non-air entrainment and internal hydrophobic porous powder for high performance of concrete

2013 Fiscal Year Final Research Report

• Project/Area Number: 24656318
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Single-year Grants
• Research Field: Building structures/materials
• Research Institution: Muroran Institute of Technology
• Principal Investigator: HAMA YUKIO 室蘭工業大学, 工学(系)研究科(研究院), 教授 (70238054)
• Co-Investigator(Kenkyū-buntansha): KISHIMOTO Yoshihiko 室蘭工業大学, 工学研究科, 助教 (30435987) ; ATARASHI Daiki 東京工業大学, 理工学研究科, 助教 (70431393)
• Project Period (FY): 2012-04-01 – 2014-03-31
• Keywords: コンクリート / モルタル / 高性能化 / 多孔質粉体 / 空気連行 / 耐凍害性 / 強度低下

Research Abstract

In this study, the aim is to develop a non-air entrainment and internal hydrophobic porous powder in order to establish a new technique which can contribute to improve the frost resistance and reduce the strength reduction due to entrained air bubbles caused in AE concrete.
As a result, when ALC was used for the material of the porous powder, it was possible to control the water repellency and the adsorption properties of water vapor by changing the addition rate and type of silicone oil, ultraviolet treatment and adsorption of hydrophilic agent to the powder surface. But it was difficult to make a porous powder having hybrid properties of the hydrophilic surface and internal hydrophobic capillary.
On the other hand, when the hardened cement paste with low W/C was used for the material of the porous powder, even without water repellency, there was no air-entraining and it was possible to reduce the strength reduction and improve the frost resistance of mortar.

Research Products

• [Presentation] Applicability of water-repellent porous powder as air-entraining material in mortar containing fly ash or shrinkage reducing admixture (2014)
  • Author(s): Daichi Wakamatsu, Yukio Hama, Mohamed Zakaria, Reiko Narumi, Tohru Nakamura
  • Organizer: 2014 Joint Seminar on Environmental Science and Disaster Mitigation Research
  • Place of Presentation: Muroran(Japan)
  • Year and Date: 2014-03-07
• [Presentation] 空気連行を目的とした撥水性多孔質粉体のフライアッシュ・収縮低減剤混入モルタルへの適用性 (2013)
  • Author(s): 若松大地,鳴海玲子,濱幸雄
  • Organizer: 日本建築学会大会学術講演会
  • Place of Presentation: 札幌
  • Year and Date: 2013-08-31
• [Presentation] Effect of water-repellent powder as air entraining agent on the frost resistance of mortar incorporating fly ash and shrinkage reducing admixture (2013)
  • Author(s): Daichi Wakamatsu, Reiko Narumi, Yoshihiko Kishimoto, Yukio Hama
  • Organizer: 7^<th> International Symposium between Korea, China and Japan on Performance Improvement of Concrete for Long Life Span Structure
  • Place of Presentation: Yanji(China)
  • Year and Date: 2013-08-20