Study of some physical, chemical and engineering properties of the soil of selected sites/ Northwest of Tikrit

Abstract

The research dealt with studying the physical, chemical and engineering characteristics of a soil site northwest of the city of Tikrit with the aim of identifying the characteristics of the soil of the region due to its importance in various construction designs. The moisture content of samples from the study area showed a relative decrease, ranging between (0.04%-1.49 %). While the results of the specific gravity values ranged between (1.83% - 2.73%), the results of the particle size analysis showed that the soil of the region is heterogeneous consisting of coarse (gravel and sand) and fine (silt and clay) grains. The percentage of gravel ranged between (0% - 40.37%), while the percentage of sand ranged between (39.82% - 90.84%) and the percentage of silt ranged between (7.93% - 33.92%). The percentage of clay is very small, ranging between (0.33% - 2.94%). Models of the study area showed a failure to examine plasticity limits. The direct shear examination also showed that the soil has a friction angle ranging between (41⸰-45⸰) and cohesion values ranging between (0-1). The results of the compaction analysis also showed different percentages in which the maximum dry density values ranged between (1.65-2 g/cm3). While the ideal moisture content values ranged between (10% - 18%), chemical analysis tests showed percentages of dissolved salts ranging between (3.22%-41.62%), while the percentage of gypsum ranged between (2.18%-38.74%). As for the organic materials, its percentage ranged between (0.013%-3.25%), while the pH ranged between (7.99-7.85). The percentage of chlorides ranged between (1.37%-0.19%).