Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The effect of elevated temperature on the properties of cement mortars containing nanosilica and heavyweight aggregates
HighlightsCement mortars containing quartz, magnetite, barite aggregate and nanosilica have been tested.Influence of elevated temperature on mechanical properties of cement mortars is examined.Nanosilica improves the thermal resistance of cement mortars in range of 200–400°C.Nanosilica helps to prevents crack extension after exposure to elevated temperatures.
AbstractIn this contribution the effect of nanosilica (NS) on the behavior of cement mortars containing quartz aggregate and two types of heavyweight aggregates (magnetite and barite) exposed to elevated temperature will be investigated. The cement mortars have been modified with nanosilica in quantities of 1%, 2%, 3%, 4% and 5% (by weight of cement). The samples were exposed to the elevated temperatures of 200°C, 400°C, 600°C and 800°C, respectively. The mass loss, flexural and compressive strength of the cooled specimens were determined. Additionally, by means of scanning electron microscopy (SEM) and optical microscopy the structure defects have been determined.The results clearly demonstrate that there is an optimal nanosilica content, in the cement mortar containing quartz and magnetite aggregate, improving the thermal resistance and preventing the crack extension (especially in the range of 200–400°C). However, the study has also shown that cement mortars containing barite aggregate tend to crack and exhibit spalling as a result of low thermal resistance of the aggregate.
The effect of elevated temperature on the properties of cement mortars containing nanosilica and heavyweight aggregates
HighlightsCement mortars containing quartz, magnetite, barite aggregate and nanosilica have been tested.Influence of elevated temperature on mechanical properties of cement mortars is examined.Nanosilica improves the thermal resistance of cement mortars in range of 200–400°C.Nanosilica helps to prevents crack extension after exposure to elevated temperatures.
AbstractIn this contribution the effect of nanosilica (NS) on the behavior of cement mortars containing quartz aggregate and two types of heavyweight aggregates (magnetite and barite) exposed to elevated temperature will be investigated. The cement mortars have been modified with nanosilica in quantities of 1%, 2%, 3%, 4% and 5% (by weight of cement). The samples were exposed to the elevated temperatures of 200°C, 400°C, 600°C and 800°C, respectively. The mass loss, flexural and compressive strength of the cooled specimens were determined. Additionally, by means of scanning electron microscopy (SEM) and optical microscopy the structure defects have been determined.The results clearly demonstrate that there is an optimal nanosilica content, in the cement mortar containing quartz and magnetite aggregate, improving the thermal resistance and preventing the crack extension (especially in the range of 200–400°C). However, the study has also shown that cement mortars containing barite aggregate tend to crack and exhibit spalling as a result of low thermal resistance of the aggregate.
The effect of elevated temperature on the properties of cement mortars containing nanosilica and heavyweight aggregates
Horszczaruk, Elzbieta (Autor:in) / Sikora, Pawel (Autor:in) / Cendrowski, Krzysztof (Autor:in) / Mijowska, Ewa (Autor:in)
Construction and Building Materials ; 137 ; 420-431
01.02.2017
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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