چكيده به لاتين
Generally, In the past, resistance was the basis of concrete acceptance, but now -in the present time, much of the expenses for construction projects is spent on the cost of repairing and rebuilding demolished structures, Therefore, the durability of manufactured concrete must be taken seriously.
On the other hand, due to environmental issues and reducing the costs of concrete production, the use of pozzolanic materials in concrete is increasing rapidly, so The Mechanical properties and durability tests of these types of concrete is required.
The purpose of this study is to investigate the effects of adding Supplementary Cementitious Materials on durability parameters such as, chloride attack and corrosion.
Accordingly, five concrete mixtures with the water to cement ratio of 0.4 (W/C=0.4) and the total cementitious materials content of 400 kg / m^3 were considered.
One of the samples was normal concrete without any mineral additives and the rest were self -compacting concrete containing stone powder.
The below sample mixtures have made by substituting additive materials instead of cement powder according to notified amounts. Self-compacting concrete samples with no mineral additives, with self-compacting concrete samples which contained 8% silica fume and self-compacting concrete which added 20% metakaolin and finally self-compacting concrete containing both mineral additives (silica fume and metakaolin).
The compressive strength, chloride ion migration coefficient, chloride permeability, conductivity, bulk electrical resistivity, pore solution conductivity, corrosion potential, corrosion current density and tests were performed on all samples.
In general, self-compacting concrete mixtures exhibited a better performance than conventional non-mineral concrete. Among the self-compacting concrete mixtures, the concrete which contained both silica fume and metakaolin additives were the best.
On the other hand, in the most correlations obtained between the different parameters of the concrete mixture, the self-compacting concrete containing metakaolin had less compatibility.
In the results high compatibility was observed within balanced bulk electrical resistivity and pore solution conductivity with rapid chloride ion migration coefficient amounts and the amount of passed charge in the chloride rapid chloride permeability test.
There was no linear equation in comparing bulk electrical resistivity and pore solution conductivity.
The most adapting range between the test of chloride ion migration coefficient with the other test results shown that this test would be as a base to equation the concrete stability.
The range of rapid chloride ion migration coefficient estimated from the Gao et.al equation[1] and Ghodussi new model [2] in self-compacting concrete mixtures which contain silica fume in comparing with other test results in laboratory samples shown the nearly similarity of rapid chloride ion migration coefficient.
In comparing the results of balanced pore solution conductivity test with maximum potential corrosion more adapting has seen. Finally, in comparing the result of pore solution conductivity test with maximum corrosion current density test more adapting has observed.
