The lateritic soils that overburden Charnockite and Gneiss Complexes in Ipele-Owo area of Ondo State, Nigeria are in grea t use for local construction. However, little is known of their engineering properties and suitability as sub-grade and sub-base materials for large-scale building and road construction. This work utilized standard geotech nical analytical techniques to examine and characterize these laterites. The results show that the soil is characteristically of a moderate strength based on the average California Bearing Ratio (CBR) test result of 52.5%. The average particle size distribution indicates 11% fine grained sand, 2% medium grains, 12.4% coarse grains, 2% fine gravel and 74.6% clay-sized particles. The respective values of the linear shrinkage, liquid and plastic limits are 10.5%, 52.7% and 23.45%. The maximum dry density of the laterites is 1778.5 kg/m3 while the moisture content is 17.65%. It is therefore suggested that the Ipele-Owo laterites are suitable for use as sub-grade and sub-base construction materials since the geotechnical properties are fairly within the regulatory standards in Nigeria.
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机译：尼日利亚翁多州Ipele-Owo地区的红土覆盖了Charnockite和Gneiss配合物，这些土地被用于当地建设。然而，对于作为大型建筑和道路施工的路基和基层材料的工程性质和适用性知之甚少。这项工作利用标准的地质技术分析技术来检查和表征这些红土。结果表明，基于52.5％的平均加利福尼亚承载比（CBR）测试结果，土壤具有中等强度。平均粒度分布表明11％的细粒砂，2％的中粒，12.4％的粗粒，2％的细砾石和74.6％的粘土颗粒。线性收缩率，液体和塑料极限值分别为10.5％，52.7％和23.45％。红土的最大干密度为1778.5 kg / m3，而水分含量为17.65％。因此，建议Ipele-Owo红土适合用作路基和基层建筑材料，因为其岩土性能完全在尼日利亚的法规标准之内。
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