Sulfate resistance evaluation of the cement with fly ash (using the Koch & Steinegger method)
Keywords:Sulfate resistance, fly ash, accelerated tests, mortar, durability
The increase of active mineral admixtures consumption in contemporaneous cementiceous materials has stablished revision of some test methods. In the evaluation of blended cement durability, many accelerated tests of large application in portland cements become unvalid, because they don't allow to value the improvements produced by pozzolan materials. Koch-Steinegger Method appears as the most appropiate to evaluate sulfate resistance of cement with active mineral admixtures. In this paper are presented the results obtained with this test in the evaluation of an ordinary portland cement (CPN) and one resisting sulfates (CPARS), with low calcium fly ash addition. Fly ash is incorporated with three fineness (280, 420 and 480 m2/Kg Blaine). The results show that this addition improves sulfate resistance of CPN and in minor way of ARS cement. Fly ash influences evolution of mechanical strength in water and chemical resistance at first ages.
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