Sulfate Resistance of Alkali Activated Cements

Abstract:

One of the most important questions of concrete durability is increasing of corrosion resistance of cement stone and materials on his basis. Perspective way of solving such problems is using of alkali activated binders.Two cement systems were investigated to obtain different materials for different application - geocement system for repair materials and protective coatings and fly ash alkali activated hybrid cement for corrosion resistant common cements and concretes.It was studied sulfate resistance of fly ash alkali activated cements after 3 years of storing in aggressive environments like 5 and 10 % solutions of sodium sulfate, 2 and 4 % solutions of magnesium sulfate and sea salt solution. It was shown that fly ash containing cements are characterized by high corrosion resistance (coefficient of corrosion resistance after 3 years of storing in aggressive environment is in the ranges 0.8...1.0) comparing with clinker cements (0.45...0.88). Shown, that high sulfate resistance of cements under study in time is caused by graduate structure development and crystallization of new formations with compacting structure of material that effect on service properties of materials.High corrosion resistance of geocement compositions (coefficient of corrosion resistance 0.9-1.05) in sulfate environment is possible because of formation of faujasite, chabasite, mordenite and nozean phases in the structure of materials. Optimal composition of geocement compositions were developed according mathematical planning of experiments and tested.

• Periodical: Materials Science Forum (Volume 865)
• Pages: 95-106
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.865.95
• Online since: August 2016
• Authors: Pavlo Kryvenko, Sergii Guzii*, Oleksandr Yuriyovich Kovalchuk, Volodymyr Kyrychok
• Keywords: Aggressive Environment, Coating, Concrete, Fly Ash Alkali Activated Hybrid Alkaline Cement, Geoсement, Hydration Products, Sulfate Resistance

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