Impact of Supplementary Cementitious Materials on Alkali-Silica Reactivity of Concrete

9 pages•Published: December 11, 2023

Amin Akhnoukh, Mostafa Namian, Preston Skinner and Hala Elia

Abstract

Alkali-silica reactivity is a deleterious reaction initiated in concrete when aggregates silica reacts with alkali hydroxide in portland cement in the presence of moisture. The ASR results in the formation of expansive gel, which induces internal stresses in hardened concrete, and may lead to concrete cracking, spalling, and possibly structure failure. The main objective of this research is to investigate the impact of supplementary cementitious materials on the gel-formation and the possible use of SCMs in mitigating ASR damage on hardened concrete. In this research, different types of aggregates were used to pour ASR test specimens, and ASR mortar bar tests were conducted according to relevant ASTM specifications. Additional specimens were poured using different percentages of SCMs, mainly silica fume and class C fly ash, and ASR testing was repeated to assess the SCMs impact on ASR. The research outcomes showed that fine SCM particles used in concrete mixes can halt the concrete expansion due to ASR. SCMs efficiency in mitigating ASR is directly proportional to the SCM particle size. The successful use of SCMs in mixing concrete will reduce the rate of concrete deterioration, limit the need for maintenance, and reduce the life cycle cost of concrete construction projects.

Keyphrases: aggregates, alkali silica reactivity, fly ash, mortar bar test, silica fume

In: Tom Leathem, Wes Collins and Anthony Perrenoud (editors). Proceedings of 59th Annual Associated Schools of Construction International Conference, vol 4, pages 280-288.

Links:	https://easychair.org/publications/paper/JKz32
	https://doi.org/10.29007/s427

BibTeX entry

@inproceedings{ASC2023:Impact_Supplementary_Cementitious_Materials,
  author    = {Amin Akhnoukh and Mostafa Namian and Preston Skinner and Hala Elia},
  title     = {Impact of Supplementary Cementitious Materials on Alkali-Silica Reactivity of Concrete},
  booktitle = {Proceedings of 59th Annual Associated Schools of Construction International Conference},
  editor    = {Tom Leathem and Wes Collins and Anthony Perrenoud},
  series    = {EPiC Series in Built Environment},
  volume    = {4},
  publisher = {EasyChair},
  bibsource = {EasyChair, https://easychair.org},
  issn      = {2632-881X},
  url       = {/publications/paper/JKz32},
  doi       = {10.29007/s427},
  pages     = {280-288},
  year      = {2023}}

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