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In the present study, the chemical analysis, related to heavy metals (Pb, Ni, Zn, Mn, and Fe) which considered the main source of pollution in soils that come from several sources, was carried out near a three fuel stations to reveal their effect on heavy metals in the nearby soils. Samples were collected from soils which are near to three Fuel stations in Al Hilla city, as a case study, it was found that the concentrations of these metals are all below the value that should be available in average shale, except that for Pb. The average concentration of metals in samples was Pb (25.47 ppm), Ni (86.65 ppm), Zn (84.38 ppm), Mn (96.71 ppm), and Fe (112.38 ppm), and a statistical analysis is done for these results to find correlations coefficients among studied elements, and the results suggested that the fuel station may compromise the nearby soils by increasing Pb concentrations in them.

As cement production causes 7% to 8% of global carbon dioxide emissions, many efforts have been made to reduce the consumption of cement. Using pozzolan (usually fly ash) as additional material with cement is one of these methods. In this paper, the impact of adding Nano fly ash as a partial substitution of cement weight was studied in self-compacting concrete for rigid pavement. Three replacement ratios were used which are (5,10 and 15) % of cement weight. The results showed that the greater substitution ratio gave better workability with higher d slump flow value and better passing ability of concrete. Also, the use of Nano fly ash improved the mechanical properties of the self-compacting concrete by increasing the compressive and splitting tensile strength. The best increase in the strength at the replacement ratio (10%) of cement weight. The slump flow for concrete mixes is between (658 to 732) mm and the compressive strength was improved with the increase of Nano fly ash replacement (10%) by about (20%) compared with conventional concrete. The rigid pavement strength able to provide a surface of good riding quality.

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