9 files

Study of the rheology of cement pastes containing ceramic brick wastes end metakaolin

posted on 08.04.2020, 02:50 by João Sérgio Filho, Kássia Sinhorelli, Guilherme Medeiros, Aline Azeredo, Givanildo Azeredo

ABSTRACT The construction industry has sought the use of sustainable solutions, one of which is the incorporation of waste as building materials. For this, studies have been developed to analyze the viability of the incorporation these residues in mortar and concrete, since these inserts modify the properties of the materials both in the hardened and fresh state. The analysis of materials such as pastes, mortars or concretes in their fresh state is directly linked to the study of a simulation of the requests that they may suffer during their mixing, transportation and application. The constituent materials and the water / binder ratio have a fundamental role in the properties of the pastes. Characteristics of the materials such as the fineness of the binder, the shape of the particle and the mineralogical origin can directly affect its workability. For the understanding of the rheological behavior of cement pastes in the fresh state, several techniques can be used such as flow and oscillation rheometry, the mini-cone spreading method, Marsh funnel flow, Squeeze flow method and the Vane test. In this work the rheological behavior of different cementitious pastes prepared with Portland cement CP V-ARI RS and addition of metakaolin (MK) end ceramic brick wastes (CBW) was studied. The pastes were analyzed for different hydration times and water/binder ratios. The experiment was carried out through measurements of rheological parameters such as flow stress and viscosity, using a parallel plate rotational rheometer. The results showed that the CBW caused a decrease in the initial flow stress when compared to the use of MK, which may contribute to a mixture with easier handling, that is, less viscous.