THE EFFECT OF CEMENT TYPE ON THE RESISTANCE OF CONCRETE AGAINST CHLORIDE PENETRATION
Islam Fawzi Kamel Noshi;
Abstract
The aim of this research was to investigate the effect of cement type on the resistance of concrete against chloride penetration for variable compressive strength classes. Three types of cement were used in this study; ordinary Portland cement, Portland blast furnace slag cement, and sulfate resisting Portland cement. The effect of using silica fume as a partial replacement of ordinary Portland cement on the resistance of concrete against chloride penetration was also investigated.
Rapid chloride ion penetration test was conducted according to ASTM C
1202. In addition, electrical resistivity and capillary water absorption tests were carried out. In order to characterize the concrete quality, compressive strength of the specimens were determined.
5.2 Conclusions
Based on the results of the experimental study, the following conclusions can be drawn:
• Concrete mixtures produced using 15% silica fume as partial replacement of ordinary Portland cement had very low chloride permeability for all the investigated concrete classes, while concretes with sulfate resisting cement had the highest chloride permeability than all other concrete mixtures.
• Except for concrete with sulfate resisting cement, the rapid chloride permeability of concrete decreased with the increase in concrete
Chapter (5)
Conclusion and recommendations
strength class. This reduction was more significant for concrete mixtures produced with Portland slag cement.
• The increase in concrete strength class has a significant effect on increasing the electrical resistivity of concrete mixtures produced using 15% silica fume as partial replacement of ordinary Portland cement which have substantial higher resistivity compared to those of pure Portland cement, Portland slag cement or sulfate resisting cement.
• Concretes produced using Portland slag cement or sulfate resisting cement had higher capillary suction compared to those of pure Portland cement for all the classes investigated. The effect of silica fume on reducing the capillary suction of Portland cement concrete was noticeable only for concrete grade of C45.
• A strong relationship was obtained between the results of the electrical resistivity test (Non-destructive test) and the results of the rapid chloride ion permeability test (Destructive test).
Rapid chloride ion penetration test was conducted according to ASTM C
1202. In addition, electrical resistivity and capillary water absorption tests were carried out. In order to characterize the concrete quality, compressive strength of the specimens were determined.
5.2 Conclusions
Based on the results of the experimental study, the following conclusions can be drawn:
• Concrete mixtures produced using 15% silica fume as partial replacement of ordinary Portland cement had very low chloride permeability for all the investigated concrete classes, while concretes with sulfate resisting cement had the highest chloride permeability than all other concrete mixtures.
• Except for concrete with sulfate resisting cement, the rapid chloride permeability of concrete decreased with the increase in concrete
Chapter (5)
Conclusion and recommendations
strength class. This reduction was more significant for concrete mixtures produced with Portland slag cement.
• The increase in concrete strength class has a significant effect on increasing the electrical resistivity of concrete mixtures produced using 15% silica fume as partial replacement of ordinary Portland cement which have substantial higher resistivity compared to those of pure Portland cement, Portland slag cement or sulfate resisting cement.
• Concretes produced using Portland slag cement or sulfate resisting cement had higher capillary suction compared to those of pure Portland cement for all the classes investigated. The effect of silica fume on reducing the capillary suction of Portland cement concrete was noticeable only for concrete grade of C45.
• A strong relationship was obtained between the results of the electrical resistivity test (Non-destructive test) and the results of the rapid chloride ion permeability test (Destructive test).
Other data
| Title | THE EFFECT OF CEMENT TYPE ON THE RESISTANCE OF CONCRETE AGAINST CHLORIDE PENETRATION | Other Titles | دراسة تأثير نوع الأسمنت على مقاومة الخرسانة لاختراق الكلوريدات | Authors | Islam Fawzi Kamel Noshi | Issue Date | 2015 |
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