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Experimental Characterization of Shape of an Aggregate by a Numerical Value—Application to Senegalese Basaltic Aggregates for Rail Transport

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Document pages: 12 pages

Abstract: This article first talksabout railways in general and ballast in particular. An inventory is then madeon the modernization of the Senegalese ballast railways. In the second phase,an experimental work of characterization of basaltic aggregates of Diack(Locality of Ngoundiane, Thiès region, Senegal) is presented. The grain sizestudied is 25 50 mm as for any material studied for use as railway ballast.Experimental work presented consists of the characterization of the shape of anaggregate using the NF P 18-301 standard. The test consists of comparing thevolume of the aggregate to that of an equivalent sphere with the largestdiameter of the aggregate, by calculating the average volume coefficient. Witha Representative Elementary Volume (REV) of 6 aggregates, the volumecoefficient “Cv” fluctuates between 0.27 and 0.49 with an averagevolume coefficient of 0.39 which is well above 0.15. Thegrains studied are polyhedral and therefore have a high mechanical resistance.

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