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Rheological parameters of the process and its influence on the performance of extruded fibercement


The extrusion is a conformation process which consists in forcing a highly viscous mixture through a mouthpiece. It is a potential candidate for industrial production of cementitious composites, such as tiles, plates and tubes, among other products. Shows versatility in the production of building elements of various geometries, including alveolar structures, not limited to plates, as in many conventional processes. Recent studies show the extrusion process as economically viable alternative manufacturing construction elements prepared with cementitious matrices.The success of extrudability in cementitious materials requires control of the rheological properties of the formulations and process parameters by means of a homogeneous mixture, rheology modifiers, packaging of raw materials and characteristics of the extruder. Thus, enabling the extrusion has not proven trivial task, making the deployment process in the national fibercement industry.The purpose of this study is to evaluate the rheological behavior of fiber cement formulations through methods Benbow and squeeze flow and correlate with the mixing parameters of the extruder. The implementation of this methodology to evaluate the rheological behavior of fibercement during extrusion and apply them to set parameters of the mixture and of the extruder facilitate future transfer of this technology to the productive sector, with potentially better products and diverse. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
TEIXEIRA, R. S.; TONOLI, G. H. D.; SANTOS, S. F.; RAYON, E.; AMIGO, V.; SAVASTANO, JR., H.; ROCCO LAHR, F. A.. Nanoindentation study of the interfacial zone between cellulose fiber and cement matrix in extruded composites. CEMENT & CONCRETE COMPOSITES, v. 85, p. 1-8, . (13/03823-8)
TEIXEIRA, R. S.; SANTOS, S. F.; CHRISTOFORO, A. L.; SAVASTANO, JR., H.; LAHR, F. A. R.. Extrudability of cement-based composites reinforced with curaua (Ananas erectifolius) or polypropylene fibers. CONSTRUCTION AND BUILDING MATERIALS, v. 205, p. 97-110, . (13/03823-8, 12/51467-3)
TEIXEIRA, R. S.; SANTOS, S. F.; CHRISTOFORO, A. L.; PAYA, J.; SAVASTANO, JR., H.; ROCCO LAHR, F. A.. Impact of content and length of curaua fibers on mechanical behavior of extruded cementitious composites: Analysis of variance. CEMENT & CONCRETE COMPOSITES, v. 102, p. 134-144, . (13/03823-8, 12/51467-3)

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