37º IAHS World Congress on Housing: - Universidad de Cantabria

XXXVII <strong>IAHS</strong><strong>World</strong> <strong>Congress</strong> on HousingOctober 26 – 29, 2010, Santander, SpainCODE: 131CONCRETES OF HIGHER RESISTANCE TO CHEMICALACTIONSSicakova, A., Terpakova, E.Institute of Building and Environmental EngineeringCivil Engineering Faculty, Technical University of Kosicee-mail: alena.sicakova@tuke.skKey words: concrete, chemical aggressive environment, mineral additive, blast furnace slag, fly ash,serpentiniteAbstractIn the paper the results of experimental works aimed on finding the optimal composition ofconcretes containing various mineral additives for assurance their high resistance to chemicalaggressive attacks are presented. 16 recipes using variations of: 4 kinds of wastes/additives(blast furnace slag, fly ash, non-treated and treated serpentinite waste), 3 kinds of their dosage(0, 10, 20% of cement amount), as well as alternative superplasticizer application (0, 1% ofcement amount) were tested. Samples were exposed to chemical aggressive environments(HCl, MgSO 4 and NaOH) for simulation of concrete corrosive processes. The distilled wateras well as open laboratory environment was used as a comparative environments. Duration ofconcrete samples exposition in tested media was 28 months. The resistance was tested in theterms of flexural strength, compressive strength and evaluation of decrease/increase ofstrengths after long time action of monitored aggressive media.For each aggressive environment is possible to recommend the most promising recipe ofconcrete from various points of view, in accordance with user´s priorities.From the percentage increase of 28- day compressive strengths point of view, there are: forHCl action – recipe with 20% of non treated serpentinite waste with plasticizer application,for MgSO 4 action -recipe with 20% of blast furnace slag without plasticizer application and for NaOH action -recipe with 10% of non treated serpentinite waste without plasticizer application.Based on the presented experimental results, application of additives/wastes as partialsubstitution of cement appears to be beneficial for achievement the resistance to aggressivechemical actions. With the keeping or enhancement of technical parameters it especiallyrepresents both the environmental and economic benefit.37º <strong>IAHS</strong> <strong>World</strong> <strong>Congress</strong> On Housing Science 78