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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effect of alkali dosage on alkali-silica reaction in sodium hydroxide activated slag mortars
https://orcid.org/0000-0003-0000-6560
https://orcid.org/0000-0001-7145-0883
HighlightsASR expansion decreases with increasing the alkali dosage for the studied mortars.Higher Al concentration mitigates the dissolution of reactive silica from the sand.The external OH− concentration is relatively lower than that of the pore solution.No major difference in ASR products for the mortars with different alkali dosages.
AbstractAlkali-silica reaction (ASR) is one of the durability factors limiting the commercial use of alkali-activated slag (AAS) concrete. The effect of alkali dosage is of great importance and barely studied for ASR in AAS system. This study investigates the effect of alkali dosage on ASR in sodium hydroxide (NaOH) activated slag mortars. In addition to ASR expansion, the changes in sample weight, compressive strength, pore structure, and pore solution chemistry are also investigated for better understanding the factors controlling the ASR in AAS mortars. The present study shows that the pore solution alkalinity increases with increasing the alkali dosage of the activator. However, the ASR expansion decreases with increasing the alkali dosage. The SEM/EDX results show no significant difference in both morphology and chemical composition of the ASR products. The lower ASR expansion at higher alkali dosage may be attributed to the relatively higher concentration of aluminum in the pore solution due to higher degree of slag hydration, which is expected to mitigate the dissolution of silica from the reactive aggregate.
Effect of alkali dosage on alkali-silica reaction in sodium hydroxide activated slag mortars
https://orcid.org/0000-0003-0000-6560
https://orcid.org/0000-0001-7145-0883
HighlightsASR expansion decreases with increasing the alkali dosage for the studied mortars.Higher Al concentration mitigates the dissolution of reactive silica from the sand.The external OH− concentration is relatively lower than that of the pore solution.No major difference in ASR products for the mortars with different alkali dosages.
AbstractAlkali-silica reaction (ASR) is one of the durability factors limiting the commercial use of alkali-activated slag (AAS) concrete. The effect of alkali dosage is of great importance and barely studied for ASR in AAS system. This study investigates the effect of alkali dosage on ASR in sodium hydroxide (NaOH) activated slag mortars. In addition to ASR expansion, the changes in sample weight, compressive strength, pore structure, and pore solution chemistry are also investigated for better understanding the factors controlling the ASR in AAS mortars. The present study shows that the pore solution alkalinity increases with increasing the alkali dosage of the activator. However, the ASR expansion decreases with increasing the alkali dosage. The SEM/EDX results show no significant difference in both morphology and chemical composition of the ASR products. The lower ASR expansion at higher alkali dosage may be attributed to the relatively higher concentration of aluminum in the pore solution due to higher degree of slag hydration, which is expected to mitigate the dissolution of silica from the reactive aggregate.
Effect of alkali dosage on alkali-silica reaction in sodium hydroxide activated slag mortars
https://orcid.org/0000-0003-0000-6560
https://orcid.org/0000-0001-7145-0883
HighlightsASR expansion decreases with increasing the alkali dosage for the studied mortars.Higher Al concentration mitigates the dissolution of reactive silica from the sand.The external OH− concentration is relatively lower than that of the pore solution.No major difference in ASR products for the mortars with different alkali dosages.
AbstractAlkali-silica reaction (ASR) is one of the durability factors limiting the commercial use of alkali-activated slag (AAS) concrete. The effect of alkali dosage is of great importance and barely studied for ASR in AAS system. This study investigates the effect of alkali dosage on ASR in sodium hydroxide (NaOH) activated slag mortars. In addition to ASR expansion, the changes in sample weight, compressive strength, pore structure, and pore solution chemistry are also investigated for better understanding the factors controlling the ASR in AAS mortars. The present study shows that the pore solution alkalinity increases with increasing the alkali dosage of the activator. However, the ASR expansion decreases with increasing the alkali dosage. The SEM/EDX results show no significant difference in both morphology and chemical composition of the ASR products. The lower ASR expansion at higher alkali dosage may be attributed to the relatively higher concentration of aluminum in the pore solution due to higher degree of slag hydration, which is expected to mitigate the dissolution of silica from the reactive aggregate.
Effect of alkali dosage on alkali-silica reaction in sodium hydroxide activated slag mortars
Shi, Zhenguo (Autor:in) / Shi, Caijun (Autor:in) / Wan, Shu (Autor:in) / Ou, Zhihua (Autor:in)
Construction and Building Materials ; 143 ; 16-23
14.03.2017
8 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Effect of alkali dosage on alkali-silica reaction in sodium hydroxide activated slag mortars
| British Library Online Contents | 2017
Effect of alkali dosage on alkali-silica reaction in sodium hydroxide activated slag mortars
| Online Contents | 2017
Effect of alkali dosage on alkali-silica reaction in sodium hydroxide activated slag mortars
| British Library Online Contents | 2017
| British Library Online Contents | 2018