THE EVALUATION OF THE EFFECT OF CHALCEDONY DUST ON THE REACTION OF ALKALIS WITH REACTIVE AGGREGATE IN CEMENT MORTARS
Journal Title: Structure and Environment - Year 2018, Vol 0, Issue 1
Abstract
Chalcedony dust can be used as a mineral additive in cements and concretes. This material can act as a pozzolan and prevent the expansion caused by the alkali-silica reaction. The paper presents the examination of cement mortars with reactive opal aggregate and various quantities of chalcedony dust conducted using a long-term method as set out in the ASTM C227. A petrographic analysis as well as tests of potential reactivity of opal aggregate were carried out by chemical method as specified in the ASTM C289. The microstructure of cement mortars with chalcedony dust and opal was also examined. The tests showed a positive effect of the chalcedony dust additive on the reduction of the expansion caused by the alkali-silica reaction compared to the mortars without the additive. The addition of 20% of chalcedony dust to cement mortars lowers the expansion to a safe level that does not exceed 0.1% after 360 days (as set out in the ASTM C227).
Authors and Affiliations
Zdzisława Owsiak, Agnieszka Mazur, Justyna Zapała-Sławeta
Keywords
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- EP ID EP521427
- DOI 10.30540/sae-2018-002
- Views 79
- Downloads 0
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