<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>Effectiveness of selected chemical admixtures and mineral additives to mitigate alkali-silica reaction was compared based on reactive gravel aggregate. Lithium compounds in the form of nitrate and lithium polysilicate were used as chemical admixtures. Natural pozzolans containing zeolite were used as mineral additive. Efficiency of the additive was enhanced by modification with ammonium ions. Linear changes of mortars with crushed gravel aggregates were studied with the accelerated and long-term methods. Additionally, scanning electron microscopy was used for microstructural observations. It was demonstrated that at elevated temperatures the application of lithium compounds provided better protection. Under conditions similar to those in the field, 20-30% of natural pozzolans proved to be more effective in inhibiting the expansion. Regardless of the method of protection applied, the presence of alkali-silica reaction products was detected in the microstructure of the mortars.</p>
</abstract>

Effectiveness of selected chemical admixtures and mineral additives to mitigate alkali-silica reaction was compared based on reactive gravel aggregate. Lithium compounds in the form of nitrate and lithium polysilicate were used as chemical admixtures. Natural pozzolans containing zeolite were used as mineral additive. Efficiency of the additive was enhanced by modification with ammonium ions. Linear changes of mortars with crushed gravel aggregates were studied with the accelerated and long-term methods. Additionally, scanning electron microscopy was used for microstructural observations. It was demonstrated that at elevated temperatures the application of lithium compounds provided better protection. Under conditions similar to those in the field, 20-30% of natural pozzolans proved to be more effective in inhibiting the expansion. Regardless of the method of protection applied, the presence of alkali-silica reaction products was detected in the microstructure of the mortars.

Methods of Mitigating Alkali Reactivity of Gravel Aggregate

Structure and Environment

This work is licensed under the Creative Commons Attribution 3.0 Public License.

{"article-title":"Methods of Mitigating Alkali Reactivity of Gravel Aggregate"}

Effectiveness of selected chemical admixtures and mineral additives to mitigate alkali-silica reaction was compared based on reactive gravel aggregate. Lithium...

Methods of Mitigating Alkali Reactivity of Gravel Aggregate

Publié en ligne: 15 nov. 2022

Pages: 102 - 109

DOI: https://doi.org/10.30540/sae-2022-013

Mots clés
alkali-silica reaction, lithium compounds, natural pozzolana, zeolite, expansion, reaction inhibition

© 2022 Zdzisława Owsiak et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 3.0 Public License.

Methods of Mitigating Alkali Reactivity of Gravel Aggregate

Publié en ligne: 15 nov. 2022

Pages: 102 - 109

DOI: https://doi.org/10.30540/sae-2022-013

Mots clésalkali-silica reaction, lithium compounds, natural pozzolana, zeolite, expansion, reaction inhibition

© 2022 Zdzisława Owsiak et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 3.0 Public License.

Mots clés
alkali-silica reaction, lithium compounds, natural pozzolana, zeolite, expansion, reaction inhibition