Building Blocks Production with Sludge

The conventional water treatment generates a residue - sludge - which must be properly disposed. There are many ways residue disposal, with for example, landfilling, incineration and reuse of sludge in construction. A advantage of the use of sludge in construction is the decreased consumption of cement and aggregates reduction of environmental impact, considering that the extraction of materials such as sand and gravel. Several studies have been developed using sludge in exchange for raw materials used in proportions that do not alter the properties of concrete. This study evaluates the incorporation of sludge in concrete used to manufacture concrete blocks. Were studied three compositions for the manufacture of concrete blocks such as: Trace 1 (reference),dash 2: by replacing 10% of the mass of cement by the dry sludge and dash 3: by replacing 20% of the mass of cement by the dry sludge. The results indicate that for traces 1, 2 and 3, the blocks are classified with a structural function, for use in masonry elements above ground level, according to the Brazilian standard.