| Abstract [eng] |
In this work is studied durability properties of self healing concrete with crystalline and slag additives. To investigate this, the compressive and bending strength of the specimens was determined. The deformations during concrete hardening was measured also. The penetration of water through concrete under pressure was studied and the resistance of freeze-thaw cycles, porosity was calculated. Chloride ions penetration tests also were done and the chloride ions penetration coeficient was determined. After testing, specimen after 3 months containing 10% cement exchanged dolomite and having crystalline additives Betocrete CT360-WP have had 10,26% less compressive strength comapring with reference specimens. Deformation calculations showed that specimens after 28 days have insignificant difference only in 0,002%.Water permeability test with 1,2 MPa pressure showed that all specimens were water resistance, but specimen with crystalline additives have been 33% more water resistant comparing with reference specimens.Chloride ion penetration test showed that samples with crytalline additive had the lowest chloride ion permeability coefficient, 33,23% lower compared to reference samples, which shows that this concrete is more durable. Concrete frost resistance prediction methology showed that concrete with crystalline additive and 10% cement exhanged dolomite had 44% better frost resistance in cycles. Summarizing all the result, it can be claimed that the use of crytalline additive and dolomite makes concrete more durable. The use of such concrete could be particulary useful in the production of building foundations, bridges, hydtrotechnical structures. |
