Activacion alcalina de escoria de horno alto con residuos de pulpa de celulosa

Résumé

The exhausting of natural resources and raw materials by industries call for urgent research to find new alternatives to combustible materials. In addition, the past few decades have seen an awakening to the need to save energy, cut expenses and consider the impact that industry has on the environment. These factors are stimulating research for more ¿environmentally friendly¿ materials. As a result, due to the need for reducing energy consumption and gas emissions which area a cause of the greenhouse effect, research is being carried out to find new more ecoefficient binders. Alkali-activated slag is a technique which has been investigated in recent years in order to save the problem of gas emissions and to preserve raw materials, as an alternative to produce binders with a low portland cement content. The main by-product in the iron industry is blast furnace slag. The technique of alkali activated slag consists of mixing slag and water in a high alkali medium. The end product is a material with binding properties and high strength. The cellulose pulp industry generates high alkaline residues witch in continually deposited in dumps. Taking into consideration the high degree of alkalinity of cellulose residue, this doctoral thesis studied the application of alkali activation with this residue in the production of clinker free binders. To achieve this, first pastes were produced, followed by experimentation to produce mortars. The results confirm the idea that it is possible to obtain materials based on clinker free binders, resulting in good quality, reasonable strength, low absorption and effectively retaining the contaminating elements.