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Alkali-silica reaction in alkali-activated combined slag and fly ash concretes: The tempering effect of fly ash on expansion and cracking.

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Title: Alkali-silica reaction in alkali-activated combined slag and fly ash concretes: The tempering effect of fly ash on expansion and cracking.
Authors: Rodrigue, Alexandre1 (AUTHOR) alexandre.rodrigue.3@ulaval.ca, Duchesne, Josée1 (AUTHOR), Fournier, Benoit1 (AUTHOR), Champagne, Mathieu1 (AUTHOR), Bissonnette, Benoit2 (AUTHOR)
Source: Construction & Building Materials. Aug2020, Vol. 251, pN.PAG-N.PAG. 1p.
Subjects: Fly ash, Silica fume, Energy dispersive X-ray spectroscopy, Slag, Expansion & contraction of concrete, Concrete
Abstract: • Increasing FA% in alkali-activated slag/FA concrete results in decreasing DRI values. • Expansion and DRI values are coherent and evaluate adequately the level of damage. • ASR-type secondary products were observed with pseudo rosette-type microtextures. • Pore solutions of slag/FA pastes specimens show high concentrations of sodium. • Pore solutions of slag/FA pastes specimens show negligible calcium concentrations. This research has shown that increasing the fly ash (FA) content in alkali-activated slag slag/FA systems results in decreasing expansion of concrete prisms incorporating moderately to highly-reactive aggregates. The internal damage in the above prisms, as determined through the Damage Rating Index (DRI), correlates well with expansion, ranging from marginal (40% FA/60% Slag; two-year expansions < 0.011%) to high (100% Slag; two-year expansions from 0.12 to 0.15%). Scanning electron microscopy (SEM) and Energy Dispersive X-ray analysis (EDS) confirmed the presence and distribution patterns of ASR-like reaction products in the alkali-activated concretes. The pore solution of alkali-activated slag/FA companion paste specimens showed high sodium concentrations but negligible calcium (essential to ASR) concentrations, thus likely explaining, along with limited internal moisture access, the limited concrete prism expansions observed in such systems. [ABSTRACT FROM AUTHOR]
Copyright of Construction & Building Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 143418006
AccessLevel: 6
PubType: Academic Journal
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  Data: Alkali-silica reaction in alkali-activated combined slag and fly ash concretes: The tempering effect of fly ash on expansion and cracking.
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  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Rodrigue%2C+Alexandre%22&quot;&gt;Rodrigue, Alexandre&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;i&gt; alexandre.rodrigue.3@ulaval.ca&lt;/i&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Duchesne%2C+Jos&#233;e%22&quot;&gt;Duchesne, Jos&#233;e&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Fournier%2C+Benoit%22&quot;&gt;Fournier, Benoit&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Champagne%2C+Mathieu%22&quot;&gt;Champagne, Mathieu&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Bissonnette%2C+Benoit%22&quot;&gt;Bissonnette, Benoit&lt;/searchLink&gt;&lt;relatesTo&gt;2&lt;/relatesTo&gt; (AUTHOR)
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Construction+%26+Building+Materials%22&quot;&gt;Construction &amp; Building Materials&lt;/searchLink&gt;. Aug2020, Vol. 251, pN.PAG-N.PAG. 1p.
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  Data: &lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Fly+ash%22&quot;&gt;Fly ash&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Silica+fume%22&quot;&gt;Silica fume&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Energy+dispersive+X-ray+spectroscopy%22&quot;&gt;Energy dispersive X-ray spectroscopy&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Slag%22&quot;&gt;Slag&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Expansion+%26+contraction+of+concrete%22&quot;&gt;Expansion &amp; contraction of concrete&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Concrete%22&quot;&gt;Concrete&lt;/searchLink&gt;
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: • Increasing FA% in alkali-activated slag/FA concrete results in decreasing DRI values. • Expansion and DRI values are coherent and evaluate adequately the level of damage. • ASR-type secondary products were observed with pseudo rosette-type microtextures. • Pore solutions of slag/FA pastes specimens show high concentrations of sodium. • Pore solutions of slag/FA pastes specimens show negligible calcium concentrations. This research has shown that increasing the fly ash (FA) content in alkali-activated slag slag/FA systems results in decreasing expansion of concrete prisms incorporating moderately to highly-reactive aggregates. The internal damage in the above prisms, as determined through the Damage Rating Index (DRI), correlates well with expansion, ranging from marginal (40% FA/60% Slag; two-year expansions &lt; 0.011%) to high (100% Slag; two-year expansions from 0.12 to 0.15%). Scanning electron microscopy (SEM) and Energy Dispersive X-ray analysis (EDS) confirmed the presence and distribution patterns of ASR-like reaction products in the alkali-activated concretes. The pore solution of alkali-activated slag/FA companion paste specimens showed high sodium concentrations but negligible calcium (essential to ASR) concentrations, thus likely explaining, along with limited internal moisture access, the limited concrete prism expansions observed in such systems. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: &lt;i&gt;Copyright of Construction &amp; Building Materials is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.conbuildmat.2020.118968
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Fly ash
        Type: general
      – SubjectFull: Silica fume
        Type: general
      – SubjectFull: Energy dispersive X-ray spectroscopy
        Type: general
      – SubjectFull: Slag
        Type: general
      – SubjectFull: Expansion & contraction of concrete
        Type: general
      – SubjectFull: Concrete
        Type: general
    Titles:
      – TitleFull: Alkali-silica reaction in alkali-activated combined slag and fly ash concretes: The tempering effect of fly ash on expansion and cracking.
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            NameFull: Rodrigue, Alexandre
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            NameFull: Duchesne, Josée
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            NameFull: Fournier, Benoit
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            NameFull: Champagne, Mathieu
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            NameFull: Bissonnette, Benoit
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            – D: 10
              M: 08
              Text: Aug2020
              Type: published
              Y: 2020
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              Value: 251
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