Study on Long-Term Inhibitory Effect of Impregnation of Mortar with Aqueous Solution of Hydrogen Peroxide on Alkali-Silica Reaction Expansion

長期間における過酸化水素系水溶液によるASR膨張の抑制効果に関する研究

The purpose of this study was to clarify the inhibitory effect of impregnating mortar with an aqueous solution of hydrogen peroxide enriched with aluminum dihydrogen phosphate (HPS) on the alkali-silica reaction (ASR). The expansion over three years of mortar processed using HPS was measured and the outermost surface of the aggregate was analyzed by X-ray photoelectron spectroscopy (XPS). The results obtained were as follows: (1) Compared with the non-soaked aggregate, the outermost surface (1 to 5 nm depth) of HPS-soaked reactive aggregate was improved with silica featuring a more stable Si-O bond as the result of an increase in the amount of active oxygen content; (2) The expansion of the mortar containing HPS-soaked reactive aggregate was significantly smaller than that of mortar containing non-soaked aggregate after 3 years, as determined using the JIS mortar bar method; (3) The expansion of the HPS-impregnated mortar containing reactive aggregate over the 3-year period following 7 days of moist curing tended to be smaller than that of the lithium nitrite aqueous solution (L) impregnated mortar and non-impregnated mortar. From these results, HPS was recognized to be effective in inhibiting the alkali-silica reaction for long periods.リン酸ニ水素アルミニウムを添加した過酸化水素系水溶液（HPS）を反応性骨材の浸漬処理剤として用いた場合のアルカリシリカ反応（ASR）抑制効果及び，HPSを反応性骨材含有モルタルの含浸剤として用いた場合のASR抑制効果について検討した。その結果，HPSと反応性骨材との反応で生成した活性酸素により骨材最表層が安定したSi-O結合のシリカに改質されることや，HPSで浸漬処理した反応性骨材を含有したモルタルの膨張率が材齢3年まで「無害」判定の0.1%未満に維持されること，ASR膨張進行過程の反応性骨材含有モルタルをHPSで含浸処理した場合の膨張率が材齢3年まで無含浸及び亜硝酸リチウム水溶液で含浸処理した場合よりも小さい傾向にあること，長期間においてもHPSはASR抑制に有効であることが明らかになった。

• Record URL:
  • https://doi.org/10.3151/crt.25.85
• Summary URL:
  • http://scholar.google.com/scholar_lookup?title=Study+on+Long-Term+Inhibitory+Effect+of+Impregnation+of+Mortar+with+Aqueous+Solution+of+Hydrogen+Peroxide+on+Alkali-Silica+Reaction+Expansion&author=K.+Sekino&author=N.+Tsuyuki&publication_year=2014
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/13404733
• Authors:
  • Sekino, Kazuo
  • Tsuyuki, Naomitsu
• Publication Date: 2014

Language

• English
• Japanese

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: pp 85-96
• Serial:
  • Concrete Research and Technology
  • Volume: 25
  • Issue Number: 0
  • Publisher: Japan Concrete Institute
  • ISSN: 1340-4733
  • EISSN: 2186-2745
  • Serial URL: https://www.jstage.jst.go.jp/browse/crt/-char/en
• Publication flags:

  Open Access (libre)

Subject/Index Terms

• TRT Terms: Aggregates; Alkali silica reactions; Chemical inhibitors; Expansion; Hydrogen peroxide; Impregnation (Engineering); Mortar
• Subject Areas: Construction; Highways; Materials; I32: Concrete; I50: Construction and Supervision of Construction;

Filing Info

• Accession Number: 01542014
• Record Type: Publication
• Source Agency: Japan Science and Technology Agency (JST)
• Files: TRIS, JSTAGE
• Created Date: Oct 29 2014 11:21AM