دانلود رایگان مقاله تعیین ارزش گل و لای سد Fergoug در ملات تولید

ABSTRACT

The production of calcined mud, with pozzolanic properties, from the large quantities of sediments dredged from Algerian dams, could be a good opportunity for the formulation of high performance mortars and pozzolanic concretes, with lower costs and less greenhouse gas (CO2) emissions. The optimal temperatures selected for calcination were 750, 850 and 950
C. The burning operation was continuous over a period of 3 h. Therefore, a series of physical, chemical, mechanical and microstructural analyses were conducted on sediment samples, collected from the waters of Fergoug dam. The results obtained from the analyses of the calcined mud, from the dam, allowed saying that mortars with different percentages of that mud represent a potential source of high reactivity pozzolanic materials.

4. Conclusion

The idea is to use calcined mud (of pozzolanic character) as a partial replacement in Portland cement which releases lime upon hydration. This would allow obtaining binders with characteristics similar to, or even better than, those of natural Portland cement (without additions). The research works presented in this article are within the general framework of the fight against the silting of dams in Algeria. Our contribution is mainly focused on opportunities for reuse in the dredged sediment industry. These natural wastes are here considered as potential mineral raw materials. The applicability of this mud on an industrial scale only depends on the study of the availability and sustainability of the raw material. The valorization of the mud from Fergoug dam has two objectives: - On the one hand, it contributes to reducing the impact on the environment, whether the polluting effect of dredged sediments or the pollution due to the production of cement which releases very intense greenhouse gases, - On the other hand, it allows recovering the dredging financial costs, through the use of mud in the composition of cement.