A solid foundation is always essential when it comes to the construction of roads and pavements. The foundation must be constructed of a long-lasting material that can sustain years of traffic while remaining dependable. The shortage of good-quality durable materials for pavement structure (base, subbase, and subgrade) on construction sites is a common issue in highway and pavement construction. As a result, the individual and combined influences of Portland cement and sand on the stabilization of lateritic soil from Agu-Awka in Anambra State, Nigeria for road pavement were evaluated. The soil sample had a California Bearing Ratio (CBR) value of 24%. This demonstrated that the laterite was insufficient for both subbase and base course materials for road pavement and so required stabilization. The soil was stabilized by adding different percentages of cement in the range of 3%, 6%, 9%, and 12% by weight, as well as various percentages of fine sand in the range of 15%, 30%, 45%, and 60% by weight. The soil was additionally stabilized using varying percentages of both cement and sand, for a total of 16 mix combinations. A soil-cement mixture with 6% cement gave the maximum CBR of 175%, while a CBR of 86% was obtained in a soil-sand mixture with 30% sand. For soil-cement-sand mixtures, mixtures containing 6% cement and 45% sand, as well as 9% cement and 45% sand, yielded a CBR value of 112%. Consequently, some soil-cement, soil-sand, and soil-cement-sand mixtures satisfied the criterion for road pavement subbase and base course materials.
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