Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Sulphide oxidation mortar tests for evaluation of the oxidation potential of sulphide-bearing aggregate
Highlights Conditions are established to promote oxidation of sulphide phases in aggregates. Two test conditions were effective in detecting aggregates with oxidizable sulphide. One test method involves soaking samples in an oxidizing agent at room temperature. The other method relies on test cycles at certain temperatures and relative humidity. The use of slag and low-calcium fly ash reduced the expansion, unlike metakaolin.
Abstract This paper proposes two new sulphide mortar bar tests. The two tests involve two exposure conditions: the first one relies on soaking the sample in an oxidizing agent (6% sodium hypochlorite) for three hours at room temperature to promote oxidation while the other test adopts a range of temperatures and relative humidity that promote oxidation and sulphate attack. Both tests were effective in discriminating between aggregates with oxidizable sulphide and those without. Moreover, the use of low-calcium fly ash at 25% and slag at 30% reduced the expansion but not to the level of samples with non-sulphide aggregates. On the contrary, 10% of metakaolin produced more expansion.
Sulphide oxidation mortar tests for evaluation of the oxidation potential of sulphide-bearing aggregate
Highlights Conditions are established to promote oxidation of sulphide phases in aggregates. Two test conditions were effective in detecting aggregates with oxidizable sulphide. One test method involves soaking samples in an oxidizing agent at room temperature. The other method relies on test cycles at certain temperatures and relative humidity. The use of slag and low-calcium fly ash reduced the expansion, unlike metakaolin.
Abstract This paper proposes two new sulphide mortar bar tests. The two tests involve two exposure conditions: the first one relies on soaking the sample in an oxidizing agent (6% sodium hypochlorite) for three hours at room temperature to promote oxidation while the other test adopts a range of temperatures and relative humidity that promote oxidation and sulphate attack. Both tests were effective in discriminating between aggregates with oxidizable sulphide and those without. Moreover, the use of low-calcium fly ash at 25% and slag at 30% reduced the expansion but not to the level of samples with non-sulphide aggregates. On the contrary, 10% of metakaolin produced more expansion.
Sulphide oxidation mortar tests for evaluation of the oxidation potential of sulphide-bearing aggregate
El-Mosallamy, Mona (Autor:in) / Shehata, Medhat H. (Autor:in)
14.08.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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