DEVELOPMENT AND ANALYSIS OF RECYCLED MORTAR WITH TOTAL AND PARTIAL REPLACEMENT OF THE SAND BY CONSTRUCTION AND DEMOLITION RESIDUE

Reference	Presenter	Authors (Institution)	Abstract
09-052	Leonardo Barga	Barga, L.(Centro Universitário Antônio Eufrásio de Toledo); Chaves, F.P.(Centro Universitário Antônio Eufrásio de Toledo); Fróis, M.R.(Centro Universitário Antônio Eufrásio de Toledo); Reis, E.A.(Centro Universitário Antônio Eufrásio de Toledo);	Civil construction generally involves several sectors. In Brazil, due to the construction methods we have adopted, a considerable amount of solid waste is generated in the execution of new buildings, as well as in renovations and demolitions. The present work had as scope a total and partial replacement of the sand for the production of mortars by sand with recycled aggregate of reddish color, having the largest portion of ceramic blocks, bricks and coatings, representing about 70% of the generated construction waste. Aiming to minimize this problem, composites were developed from Portland cement and small aggregate in which it is composed of different proportions of sand and recycled aggregate. The X-ray diffraction laboratory of the FCT-UNESP located in the city of Presidente Prudente/SP, was used for the manufacture of the test bodies. The residue was processed after crushing in an impact type crusher. Simultaneously, it was sieved with a 10 mm sieve, thus allowing the test bodies to be manufactured in accordance with ABNT NBR 13279-2005, with a 1: 3 trace (Portland cement and sand), containing the replacements of the sand in the proportions of 100,80,60,40,20 and 0% of the residual sand and the remaining mass content with common sand. Based on the ABNT NBR 13279-2005 standard for axial compression and three-point bending tests, both use a universal test machine, model EMIC 23-100. By means of the axial compression test, it was observed that the values presented were close to those obtained for conventional mortar, and it was verified that the insertion of residues does not entail significant losses for this property. In relation of the three-point flexural test, small oscillations of resistance are noted by increasing the proportion of the residue, possibly because the particles do not exhibit good strength when exposed to the required shear stress.
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