Pregled bibliografske jedinice broj: 268442
Effect of silica fume on the durability of Portland cement mortars exposed to magnesium sulphate attack
Effect of silica fume on the durability of Portland cement mortars exposed to magnesium sulphate attack // Book of Abstract/14th Conference on Materials and Technology, 16-18 October 2006, Portorož, Slovenia / Jenko, Monika (ur.).
Ljubljana: Inštitut za kovinske materiale in tehnologije, 2006. str. 129-129 (poster, međunarodna recenzija, sažetak, znanstveni)
CROSBI ID: 268442 Za ispravke kontaktirajte CROSBI podršku putem web obrasca
Naslov
Effect of silica fume on the durability of Portland cement mortars exposed to magnesium sulphate attack
Autori
Zelić, Jelica ; Radovanović, Ivana ; Jozić, Dražan
Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni
Izvornik
Book of Abstract/14th Conference on Materials and Technology, 16-18 October 2006, Portorož, Slovenia
/ Jenko, Monika - Ljubljana : Inštitut za kovinske materiale in tehnologije, 2006, 129-129
Skup
14th Conference on Materials and Technology, 16-18 October 2006, Portorož, Slovenia
Mjesto i datum
Portorož, Slovenija, 16.10.2006. - 18.10.2006
Vrsta sudjelovanja
Poster
Vrsta recenzije
Međunarodna recenzija
Ključne riječi
blended cement; silica fume; sulfate attack; durability; elastic modulus
Sažetak
The deterioration of concrete structures due to the presence of sulfate in soils, groundwater and marine environments is a well-known phenomenon. The use of blended cements incorporating materials, such are: natural pozzolans, fly ash or silica fume, have an important role in the long-term durability of concrete exposed to sulfate attack. In this work, the partial replacement (2-15 mass %) of commercial bended Portland cement (Type CEM IIA-S 42.5N) with silica fume (SF) is investigated in terms of resistance of SF mortars to magnesium sulfate (MgSO4) solution ( (SO4)2-=2.5% ; exposure time up to 6 months at 20oC). The changes in length of mortars due to expansion, as well as changes in the elasticity modulus and mechanical strengths loss, as a function of silica fume replacement were determined. Structural changes in mortars because of magnesium sulfate attack were also evaluated by the differential thermal analysis (DTA) and by the X-ray diffraction analysis (XRD). Results show that the replacement of SF in most cases has a positive effect on the magnesium sulfate resistance. Mortars containing more than 8 mass % of SF replacement are characterized by a good sulfate resistance and show lower expansion than the control mortar on the basis of the sulfate-resisting Portland cement, due to the absence of the gypsum and ettringite, detected by XRD analysis. It is also shown that elastic modulus is proportional to the compressive strength, but higher compressive strength does not necessary correlate with better durability to sulfate attack.
Izvorni jezik
Engleski
Znanstvena područja
Kemijsko inženjerstvo
