Statistical Analysis Of Variance ( Anova ) And Scott Knott Multiple Comparison Test
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2.5.3 Statistical analysis
Two tests were made: analysis of variance (ANOVA) and Scott-Knott multiple comparison test. ANOVA was made with Microsoft Excel® software. Scott-Knott was conducted with Sisvar® software to compare means (treatments statistically different). Both tests were made with a 95% confidence limit.
2.5.3 Air permeability
Air permeability of the mortars was evaluated according to Thenoz method (Pereira and Camarini, 2011). Cylindrical specimens (50 mm diameter and 100 mm height) were prepared and cured at room temperature for 28 days (average temperature of 25 °C ± 2 °C and relative humidity of 60%). Before testing, the specimens were cut into three parts and the central part (50 mm height) was used in the test. The slices were oven-dried at 50 °C ± 2 °C for 48 h and after cooling they had their lateral surfaces sealed to guarantee the flow was uniaxial and perpendicular to the cross-sectional area. The test was made in a varying charge apparatus. The average values of three specimens of each mortar composition were reported. Air permeability was calculated by the Equation 1, which is based on Darcy’s law (Camarini et al., 2008).
k = (μ/ρ.g).(s/S).ln(h0/h1).1/t Equation 1
Where: k = air permeability coefficient (m²); μ = air viscosity at the test temperature (Pa.s); ρ = density of water (kg/m³); g = specific gravity (m/s²); S = cross-sectional area of the sample (m²); s = cross-sectional area of capillary tube (m²); h0 = start water level (m); h1 =