Results - Durability Index Test
The permeation transport mechanism was studied by performing oxygen permeability index tests on various samples. The results for the 0.45 mixes with the fly ash mix, increased cement and original CEM I 52.5N indicate that the lower the water binder ratio, the more permeable the concrete is. With regard to the 14 days wet curing samples, the 0.45 fly ash samples without the 5 mm surface layer are 3.35 % less permeable than the samples with the surface layer intact. The 0.45 samples with the original cement binder have a 1.43 % difference between layer cut off and layer intact. The 0.45 mix containing an increased cement content has a difference of 0.37 % between layer cut off and layer intact.
The water sorptivity results show very small differences between the sample with and without the 5 mm surface layer. The majority of these differences are below 1 %.
Image representing the OPI values for the specimens with and without the 5 mm surface layer. The binder type and w/b ratio differes for the different tests (FA - fly ash, IC - increased cement)