Microstructural Evaluation of Cement Mortars with Blast Furnace Slag Exposed to Sulfate Attack
Journal Title: International Scientific and Vocational Studies Journal - Year 2018, Vol 2, Issue 1
Abstract
Sulfate is a major chemical threat to concrete and reinforced concrete structures. In this study, a micro-structural analysis of the effects of sulfate on cement mortars with blast furnace slag substitution was conducted. To observe the effect of blast furnace slag on cement mortar, blast furnace slag substitution was made instead of CEM I 42.5 R cement at different ratios. Mechanical properties, length change and micro-structures of samples cured in potable water and 10% Na2SO4 solution for 7, 28, 90 days were analyzed. When the results of compressive strength and length change were examined, it was seen that compressive strengths and length change values increased in time. The length change values were found to be higher in the sulfate environment. The blast furnace slag in the sulfate environment has reduced the percentage of length change. A comparative chemical analysis of the samples, C-S-H (Calcium Silicate Hydrate), CH (Calcium Hydroxide) and Ettringite developments were presented in terms of micro-structural properties. As a result, it was observed that CH gels develop in 7 day samples, C-S-H gels in 28 day samples, and ettringite in samples cured in % 10 Na2SO4 solution for 90 days.
Authors and Affiliations
İlhami DEMİR, Selahattin GÜZELKÜÇÜK ,Özer SEVİM, Ahmet FİLAZİ, Çağrı Göktuğ ŞENGÜL
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