Publication: Pengaruh bahan tambah metakaolin sebagai bahan pengganti dalam peresapan ion klorida dalam mortar
Date
2005-03-01
Authors
Mohd Zain, Mohd Norhanizan
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Abstract
This study is done to define chloride ions absorbtion coefficient rate which is going through the mortar. Main factor studied was the effect of metakaolin addition with different composition on the chloride ion absorbtion in mortar. 4 samples is tested where one sample is not added with metakaolin while another three samples is added with metakaolin with different composition that is 12.5%, 20% dan 27.5%. Chosen methods was faster method by using electric field. This method is more practical because shorter time is needed compared to the soaking method. A part of the chloride ion which is going through the mortar is absorbed by the gel produced from the mortar hydrating process. Chloride bonding processes will effluence the speed of chloride ion absorbtion into the mortar layer. This will reduced the effective absorbtion coefficient. In this project water:cement ratio is fixed at a value of 0.55 and cement:aggregate is 1:2. This is to ensure those factors will not effluence the absorbtion rate. Another tests which has been done were compressive strength test and density test. With addition of metacaolin, the chloride ion absorbtion coefficient is reduced from6.29 x 10-8 to 2.41 x 10-8 for NernsPlank and for Einstein the value is reduced from 12.2 x 10-8 to 4.42 x 10-8. The decreasing of the chloride ions absorbtion coefficient is for the composition which is not added with metakaolin and for the sample with 27.5% metakaolin.