Influence des paramètres de formulation sur les propriétés physiques et mécaniques des mortiers à base des sédiments de barrage de SEKKAK

Abstract

Our work consists first of all in the valorization of the mud of the SEKKAK dam in view of a possible elaboration of an eco cement with performances similar to the ordinary cement. Since the current environmental conditions encourage more and more the elaboration of eco-respectful concrete and mortars, the aim of this research is to study the influence of the characteristics of the mineral addition. The purpose of our research is to study experimentally the influence of different concentrations of dredged and treated sediments as well as mineral substitutes for CEMII/A 42.5 cement in the composition of a mortar. The aim is to compare the incorporation of this calcined silt in a mortar to a control mortar. This has led us to six mortars with different composition, first a substitution of percentages of 5, 10, 15, 20 and 25% of the calcined sludge and a mortar without additions for the need of comparison. One of the main objects of this research work is to compare the results of the mechanical strength obtained by using destructive and non-destructive tests such as the ultrasonic test. Complementary tests of capillary absorption and occluded air measurements were also carried out, as well as tests to determine the physical and mechanical properties in the cool and hardened state. In addition to the economic interest that presents a mortar based on calcined silt, our study has shown that the latter presents performances very comparable to those obtained on control mortars.