Farklı puzolanların tekli, ikili ve üçlü çimentolu sistemleri içeren harç karışımlarının dayanımı ve geçirgenlik performansı açısından kıyaslanması

Abstract

In this study, the effect of silica fume and metakaolin on the strength, transport properties and ultrasonic pulse velocity of the mortar mixtures containing plain, binary and ternary cementitious systems were investigated comparatively. For this purpose, in addition to the control mixture containing no mineral admixture, three series of mixtures were produced by replacing silica fume and metakaolin with cement in different ratios. In the first and second series mixture, metakaolin and silica fume were used as 7.5wt% of the cement, respectively. In the third series, a mixture containing 15% of mineral admixture was prepared by replacing both silica fume and metakaolin with 7.5wt% of cement. In the all of mixture, the water/cement ratio, sand/binder ratio and flow values were kept constant. Water reducing admixture was used in different ratio for providing the desired flow values. The time-dependent flow value, compressive and flexural strengths, water absorption capacity and ultrasonic pulse velocity of the mixtures were determined. According to the test results, irrespective of utilization of mineral admixture, the time-dependent flow value, strength, permeability and ultrasonic pulse velocity of the mixtures were positively affected by using admixture. This effect was more pronounced by elapsing time. In the early ages, the metakaolin-bearing mixture with binary cementitious system showed better performance compare to the other mixtures. However, after 28 days, the mixture containing both metakaolin and silica fume with ternary cementitious system showed the most successful results.