Avaliação do ambiente térmico de um galpão climatizado para criação de frangos de corte.

Abstract

ABSTRACT: The objective of this trial was to analyse the corrosion process of mortars, usually used in the residues storage tanks covering. These residues are produced in farm animal facilities. In this way, were made six tanks, covered internally with cement and sand mortar in 1:3, 1:4 and 1:5 proportions. These tanks were supplied with bovine and swine adults wastes, diluted with water. Data regarding the wastes degradation process were obtained by means pH and redox potential variations in samples collected on the tanks before, two and four months after supplying. Data regarding mortars corrosion process were obtained on 5x10-4 m3 test bodies, which were made with same mortar proportions adopted in the covering of the tanks and stayed immersed in the referred wastes during the experimental period. After the immersion period, they were analysed. The results showed that swine wastes provided larger difference of redox potential, what reinforces the need of rigorous control of the corrosive process in structures exposed to those wastes. The pH value, in swine and bovine substrates varied between 6.9 and 7.6, what favoured the microrganisms development and consequent attack of the mortars. The 1:3 proportion mortar resulted smaller corrosion and roughness, being suitable to cover internal surfaces of the tanks used to storage swine and bovine wastes.