Engineering Geological Evaluation of Lithostratigraphy of Lokoja Sandstone, North Central Nigeria

Abstract

The Lokoja Sandstone was investigated for engineering properties. Three road cut samples were collected from three of its Lithologic Sections and subjected to index as well as engineering tests. Soils around sampling points A and C showed higher insitu moisture, specific gravity values, liquid limits and better grading, engineering properties promising better load bearing capacity. Also, maximum dry densities were higher along A and C than B but optimum moisture content was highest around B implying greater fluid tolerance under field conditions. It was concluded that Lokoja Sandstone approaches acceptable standards for engineering spoils and should be considered for such purposes although attention was recommended to be paid to improving soils around sampling point B to improve its properties. Sample A test evaluation shows: MC (7.2), MDD (2.2gg/cm³), PL (37.50%), LL (24%), Gs (2.5). Sample B test evaluation shows: (MC: 5.4, MDD: 1.7g/cm³, PL: 25%, LL: 19%). Sample C test evaluation shows: MC (5.6), highest MDD (1.8g/cm³), well-graded (1.21), better PL (33.3%) and LL (20%).