Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Evaluation of cement soundness using the ASTM C151 autoclave expansion test
Abstract In this research, the expansive behavior and microstructure of cements having different MgO contents and autoclave expansions were investigated. Cements were found that failed the ASTM C151 autoclave expansion test (AET) limit while still being well below the chemical MgO limit, while other cement samples from the same source and with similar MgO contents passed the AET expansion limit. While it is desirable to assess cement soundness using an accelerated technique, the test result must reflect the long-term behavior. In the current study, paste, mortar, and concrete prisms were stored at different temperatures and it was found that the AET provides an unrealistic basis for assessing volume stability as well as for rejecting portland cements for use in concrete.
Highlights The autoclave test does not correctly predict the long-term expansion of cements. Slag cements were effective in reducing the ASTM C151 autoclave expansion. Increasing the curing temperature from 23 to 80 °C not caused additional expansion.
Evaluation of cement soundness using the ASTM C151 autoclave expansion test
Abstract In this research, the expansive behavior and microstructure of cements having different MgO contents and autoclave expansions were investigated. Cements were found that failed the ASTM C151 autoclave expansion test (AET) limit while still being well below the chemical MgO limit, while other cement samples from the same source and with similar MgO contents passed the AET expansion limit. While it is desirable to assess cement soundness using an accelerated technique, the test result must reflect the long-term behavior. In the current study, paste, mortar, and concrete prisms were stored at different temperatures and it was found that the AET provides an unrealistic basis for assessing volume stability as well as for rejecting portland cements for use in concrete.
Highlights The autoclave test does not correctly predict the long-term expansion of cements. Slag cements were effective in reducing the ASTM C151 autoclave expansion. Increasing the curing temperature from 23 to 80 °C not caused additional expansion.
Evaluation of cement soundness using the ASTM C151 autoclave expansion test
Kabir, H. (Autor:in) / Hooton, R.D. (Autor:in) / Popoff, N.J. (Autor:in)
11.06.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| British Library Online Contents | 2002
Soundness test for Portland cement
| Engineering Index Backfile | 1942
Soundness test for Portland cement
| Engineering Index Backfile | 1942
| Engineering Index Backfile | 1928