Farklı Sınıf Çimento Harcı Üretiminde Metakaolin Katkısı Kullanımının Araştırılması

Abstract

In this study, it was studied physical and mechanical properties of Portland cement mortars with different strength classes and metakaolin (MK) substituted. Two different Portland cement such as CEM II/B-M 32.5 R (A cement) and CEM I 42.5 R (B cement) is used in the production of mortar samples. Metakaolin which is substituted by cement was obtained as a result with sintering of kaolin clay in five different temperatures (600, 700, 800, 900 ve 1000 o C) in the laboratory conditions. 7-day sintered metakaolin samples were conducted pozzolanic activity test and the highest pozzolanic activity index was obtained in the samples sintered at 900 o C. Then, it was substituted at a rate of 10 % and 20 % metakaolin material sintered 900 o C and it was compared with the reference cement mortar. Standard sand was used in the production and the samples were placed with vibration method in 40 x 40 x 160 mm metal mould according to TS EN 196-1. Later, 7 and 28 days water cure is applied to samples. Finally, the physical tests such as water absorption, porosity, bulk density and apparent density with the mechanical properties such as flexural strength and compressive strength were determinated. However, the ultrasound values were determinated from the samples. As a result, the highest compressive strength values were obtained from the samples with 20 % MK together A cement and 10 % MK together B cement.