eng Science and Education Publishing American Journal of Civil Engineering and Architecture 2328-3998 2023-05-21 11 2 52 63 10.12691/ajcea-11-2-4 AJCEA20231124 article Sorel Gael Dzaba Dzoualou 1 Louis Ahouet louisahouet2@gmail.com 1 2 3 Sylvain Ndinga Okina 3 3 Mang Egrik P. W. O. Nkembo 3 Higher National Polytechnic School (ENSP), Marien Ngouabi University-Brazzaville ¨CCongo This work evaluates the effect of adding limestone (corrector) to lateritic gravelly on the granulometric fractions of the mixtures in the process of modifying the mechanical properties. The lateritic gravelly - limestone couple does not obey the law of mixtures. The optimal mixture is obtained by adding 30 % by weight of the corrector to obtain a mixture with unmeasurable clay, silt (4.25 %) and sand (19.47 %) contents. The results obtained show that from 15-30% by weight of the corrector, the compressive strength, elastic modulus, CBR and maximum dry density increase and the use properties are improved. From 30-40% by weight of the corrector with sand fraction SF (19.47-21.09%) in the mixture, the mechanical properties decrease. The addition of the corrector (15-40%) decreases the clay (5.18-1.68%) and silt (14.09-0.67) fractions, while the sand fraction (12.93-21.09%) increases by 63.11%. The increase of the sand fraction by 50.58% decreases the plasticity index by 77.16%. For a sand fraction SF (50.58-63.11%), the plasticity index is not measurable and the sand equivalent SE (32.5-35%) of the mixture increases by 7.69%. Increasing the sand fraction causes the compaction curves (Proctor) to flatten and the optimum moisture content to decrease. There is a negative correlation between compressive strength and strain at failure. Mixes containing 15-25% and 30-40% of the corrector can be used as a base layer for T1 < (5.105) and T1-T2 (5.105 - 1.5.106) traffic respectively, in terms of the cumulative number of passes of a 13T equivalent axle. http://pubs.sciepub.com/ajcea/11/2/4/ajcea-11-2-4.pdf lateritic gravelly geotechnical particle size fraction mechanical properties of soil optimization of mixture