Study on the compacting of materials for the various layers of the roadway: the case of access roads to the second wouri bridge in cameroon

Aimé Elime Bouboama., Marcelline Blanche Manjia., Mamba Mpele and Augustin Jean Doualla

In order to achieve an adequate layout of the various roadway components of the project for the construction of the second Wouri bridge, with the aim of limiting the short term degradation due to the joint action of weather conditions and the intense traffic of heavy-duty vehicles, a study has been carried out and results presented on some parameters, ranging from geotechnical tests on soil Shrinkage/Swelling, materials bearing capacity, water content rate and other properties linked to the mechanical behaviour, that have an influence of the compacting of materials used in the project. Then a computer modeling was carried out on the layout of ALIZE-LCPC roadways in order to illustrate the influence of the variation in the thickness of layers of the runway on the lifespan of the latter. In the final analysis, results of the Compacting Trial area carried out on the Bituminous Graves (GB3- 0/20) are presented in order to optimize the implementation process, so as to come out with an optimum compacting energy necessary to achieve the adequate level of compactness (a VacuumPercentage of ≤ 9%according to NF P 98-150-1 and an implementation Compactness against the Real relative densityC/MVRemax ≥ 89%). By applying thefour compacting energies defined in our test board, corresponding energy No.1, 12 passages of the wheel compactor and 4 passages of the vibratory compactor enabled us to achieve a Minimum Vacuum Percentage of 5.3% corresponding to a maximum compactness as compared to the Real Relative DensityC/MVRemax equal to94.6%,in conformity with the Project’s Special Technical Specifications, with norms NF P 98-150-1 and NF P 18-545,and with the Control Plan ofVRD – SOG – PES - EXE 6101.

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