Comportamento mecânico e durabilidade de argamassas incorporadas com resíduo de caulim calcinado.

Abstract

The built environment of the future is being built at the beginning of a new was ecological, that of re-use. In this sense, the use of waste as alternative way of replacing the cement in mortars can reach the level of sustainability. Excessive production of waste from kaolin in the state of Paraíba and in the interior of the state of Rio Grande has been under investigation. The kaolin residues from the processing of kaolin classified as waste are disposed of indiscriminately in the environment, causing great environmental impact and damaging the surrounding population of waste batteries. In an attempt to propose alternatives for reuse of this waste and the production of innovative materials for the most varied sectors of construction, this paper presents the objective of evaluating the mechanical behavior and durability of mortars incorporated with residue of calcined kaolin. The mixture used was composed of 50% kaolin residue + 50% fine kaolin residue, were incorporated into the mortars in 1: 2: 6 and 1: 2: 8 mass proportions with cement substitution of 0%, 5%, 10%, 15%, 20% and 30%. 0%, 5%, 10%, 15%, 20% and 30%. The mortars were submitted to different cures, these being carried out in an environment internal and external environment, obeying the ages of 30, 60, 90, 180 and 360 days and subjected to the tests of accelerated durability by means of the wetting and drying cycles. For the incorporation of this residue in mortars were carried out the physical, chemical and mineralogical characterization of the residue, as well as the evaluation of the burning temperature of the residue for evaluation of pozzolan reactivity. Pozolana with better characteristics physics was determined at a temperature of 800 ° C and from this it was the incorporation of the residue of calcined kaolin in the form of pozzolan in mortars. 50 cylindrical specimens were molded mm x 100 mm. The specimens according to the type of cure and age were evaluated mechanically by the compressive strength test simple. Samples of the mortars were sprayed in pistil with porcelain mortar and sieved in No. 200 ABNT sieve after the test compression strength to be analyzed by X-ray diffraction, differential and gravimetric thermal analysis values ​​presented, mortars with by the residue of calcined kaolin, can be classified according to the with NBR 13281 (2001) as Type I with resistance values mechanics ≥ 0.1 and ≤ 4.0 (MPa) and Type II with ≥ 4.0 and ≤ 8.0 (MPa) for both traces 1: 2: 6 and 1: 2: 8.