International Journal of Concrete Structures and Materials

  • 제8권4호
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  • Pages.315-326
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  • 2014
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  • 1976-0485(pISSN)
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  • 2234-1315(eISSN)
한국콘크리트학회 (Korea Concrete Institute)
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DOI QR코드

DOI QR Code

Comparison of ASR Mitigation Methodologies

  • Islam, Mohammad S. (Department of Civil and Environmental Engineering and Construction Management, University of Nevada)
  • 투고 : 2013.12.17
  • 심사 : 2014.05.22
  • 발행 : 2014.12.30
⟨ 이전 논문 다음 논문 ⟩

초록

This study evaluates the dosages of Class F fly ash, lithium nitrate and their combinations to suppress the excessive expansion caused by alkali-silica reactivity (ASR). In order to serve the proposed objective, the mortar bar specimens were prepared from (1) four dosages of Class F fly ash, such as 15, 20, 25 and 30 % as a partial replacement of Portland cement, (2) up to six dosages of lithium nitrate, such as lithium-to-alkali molar ratios of 0.59, 0.74, 0.89, 1.04, 1.19 and 1.33, and (3) the combination of lithium salt (lithium-to-alkali molar ratio of 0.74) and two dosages of Class F fly ash (15 and 20 % as a partial replacement of Portland cement). Percent contribution to ASR-induced expansion due to the fly ash or lithium content, test duration and their interaction was also evaluated. The results showed that the ASR-induced expansion decreased with an increase in the admixtures in the mortar bar. However, the specimens made with the both Class F fly ash and lithium salt produced more effective mitigation approach when compared to those prepared with fly ash or lithium salt alone. The ASR-induced expansions of fly ash or lithium bearing mortar bars by the proposed models generated a good correlation with those obtained by the experimental procedures.

키워드

참고문헌

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피인용 문헌

  1. Role of solution concentration, cement alkali and test duration on expansion of accelerated mortar bar test (AMBT) vol.49, pp.5, 2014, https://doi.org/10.1617/s11527-015-0626-2
  2. Micro and Nano Engineered High Volume Ultrafine Fly Ash Cement Composite with and without Additives vol.10, pp.1, 2014, https://doi.org/10.1007/s40069-015-0122-7
  3. Parametric study and alkali-silica reactivity-induced expansion model of ASTM C 1260 vol.72, pp.20, 2014, https://doi.org/10.1680/jmacr.18.00544