Using Mathematical and Numerical Methods towards on the Pipelines' Material Sustainability

This paper is focused on the statistical analysis of a correlation between the selected corrosion parameters of concrete composites with 10 wt.% of coal fly ash replacement exposed to de-ionized water (pH value of 6.25), 0.5% solution of H2SO4 (pH value of 0.99) and 0.5% solution of Al2(SO4)3 (pH value of 3.22). Experiments runs in five consecutive phases over a period of 50 days. Dissolved amounts of Ca, Si, Fe and Al due to the aggressive media exposure, from the cement matrix into leachates, were measured in the experiment by X-ray fluorescence (XRF). Analyzing the concentration of selected ions considering mutual dependences on time (measured after each phase) is presented in the paper. Correlation between differential dissolved masses of the chemical elements considering each aggressive media are calculated and discussed.