ABSTRACT

Increasing road construction activities in Nigeria has led to increased demand for lateritic soil (LS), whose properties vary from one location to another, and. The properties of some of this laterite deposits along road alignment can be improved to enable it withstand traffic loads. This paper presents results of the laboratory evaluation of LS stabilised with oil palm fibre ash and cement blends, with a view to determine its suitability as flexible pavement construction material. The mixtures were subjected to British Standard heavy (modified Proctor) compaction energy to determine their strength characteristics. Test results show that the properties of LS improved with oil palm fibre ash and cement treatment. The maximum dry density decreased with corresponding increase in optimum moisture content as the cement content increased from 0% to 6% and the LS content of the mixtures decreased with increased oil palm fibre ash, at a fixed per cent of cement. The peaked California bearing ratio of 190.09% (soaked) recorded for the 80% LS + 14% OPFA + 6% C mix proportion, with 14th day unconfined compressive strength of 785.75 kN/m², cohesion of 140 kN/m² and angle of internal friction of 25°, can be used as a base material in road construction. Further work may be encouraged to assess resilient modulus of this material under cyclic load.

摘要

尼日利亚道路建设活动的增加导致对红土 (LS) 的需求增加，其特性因地而异。可以改善沿道路路线的一些红土沉积物的特性，使其能够承受交通负荷。本文介绍了用油棕纤维灰和水泥混合物稳定的 LS 的实验室评估结果，以确定其作为柔性路面建筑材料的适用性。混合物经受英国标准重型（改进的 Proctor）压实能量，以确定它们的强度特性。试验结果表明，油棕纤维灰和水泥处理可改善 LS 的性能。当水泥含量从 0% 增加到 6% 时，最大干密度随着最佳含水量的相应增加而降低，并且混合物的 LS 含量随着油棕纤维灰分的增加而降低，在水泥的固定百分比下。80% LS + 14% OPFA + 6% C 混合比例的加州承载比峰值记录为 190.09%（浸泡），第 14 天无侧限抗压强度为 785.75 kN/m²、内聚力140kN/m ²，内摩擦角25°，可作为道路施工的基材。可以鼓励进一步的工作来评估这种材料在循环载荷下的弹性模量。