Análise da influência da velocidade e do tempo de mistura nas propriedades de argamassas.

Abstract

Analysis of the influence of mixing speed and time on mortar properties. Seeking to meet all the requirements for laying, coating, waterproofing, surface finishes, and guaranteeing the quality that is expected through standardized values, and considering that construction is one of the greatest indicators of a company's economic and social growth, the more the market grows, the greater the consumption. It is observed, therefore, the importance of performing studies to analyze performance of mortars, ensuring a good performance, and seeking to better understand their properties and develop new materials to achieve a final quality product. It is observed that the time and the speed of mixing tend to be determining factors in the preparation of a mortar, especially if we take the situation to the day to day of a work, where we have the human factor, which is highly variable. In this way, this study aims to evaluate the influence of time and speed of mixing on lime mortar and with chemical additive, both of which are frequently used in the city of Campina Grande. 1: 2: 8 (cement: "lime": sand - by volume) and 1: 8 (cement: sand - with additive by volume) molds were molded with test pieces measuring 5 x 10 (cm), aiming to evaluate the influence of time and mixing speed on the fresh and hardened properties of the mortars. In the fresh state, the mass density and the spreading were evaluated in the consistency table. In the hardened state the absorption by capillarity, density in the hardened state and the compressive strength were studied. The molded test specimens were tested at the age of 28 days, where it was observed that the sample with "Cal", varying the time and speed, became less dense, with a higher capillary coefficient and less resistant in the However, mortar with Aditive had a slight "drop" in density, with lower capillary coefficient, with better resistance results.