Mechaniczne właściwości i mikrostruktura zapraw z wieloskładnikowego cementu, poddanego korozji siarczanowej
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Department of Construction, Kırsehir Vocational School of Technical Sciences, Kırşehir Ahi Evran University, Kırsehir 40100, Turkey
Department of Civil Engineering, Kırıkkale University, Kırıkkale 71451, Turkey
Publication date: 2020-08-02
Cement Wapno Beton 25(2) 137-153 (2020)
Sulfates are a significant chemical components that may lead to failures of cement concrete composites. The present study is dedicated to analyzing the effects of sulfate on the microstructure of cement composite mortars. For this purpose, cementing composite specimens were prepared with 20% pozzolan mixture [fly ash + granulated blastfurnace slag + bottom ash] by mass of cement, together with the reference additive-free specimen of cement concrete, without any mineral admixtures. These cementing composite mortar specimens were then treated for 2, 7, 28, 90, and 360 days in tap water and 10% sodium sulfate solution. The microstructure of the additive-free mortar and composite cement mortar, partially replaced with 20% pozzolan, was then investigated using a scanning electron microscope. The results showed that increasing curing time also increases the formation of C-S-H [calcium silicate hydrate] gel in the cement mortar, when the microstructural changes in the cement are explored in detail. Ettringite formation [3CaO·Al2O3·3CaSO4·32H2 O] in the specimens cured in 10% Na2SO4 was also noticed, in the present experiments.
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