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je veux savoir la relation entre le quantité de beton et le coffrage,et celle entre le volume de béton et d'acier

j'ai vu quelque part que :quantité de bois de coffrage=0.6 volume beton 

et quantité d'acier=0.5 v beton

y' a t'il parmi vous qui utilise ce formules,sinon expliquer moi comment vous faite pour déterminer ces valeurs( bois de coffrage ,acier


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