Multi scale experimental study of concrete rheology: From water scale to gravel scale

Rheometric tests are carried out on cement based suspensions. Four scales are defined for this study: the saturating fluid scale, the cement paste scale, the mortar scale and finally the concrete scale. Each scale is considered as a suspension defined by its maximum granular class size. Each scale is obtained by adding a higher granular size to the previous scale. For each obtained suspension, an adequate rheometric apparatus is used to study the rheological behaviour for adequate shear rates range. The obtained experimental results are presented in this paper and the influence of the inclusions volume fraction on the rheological properties of the considered scale is investigated. In addition, a multi scale analysis is carried out on the measured yield stress values.