Pedological study is essential because it contributes to improving our knowledge on materials used to construct buildings of which life is in compliance with the norms in force. Our study is based on the acoustic properties of the pozzolan concrete of the Ambohinaorina (Vakinankaratra region- Madagascar). The numerous experimental results obtained in this article demonstrate that pozzolan can be used to produce lightweight concrete in taking into account the volumetric composition of aggregates (cement included) which has to be optimum.