Argamassas com adição de fibras de polipropileno -estudo do comportamento reológico e mecânico. / Mortars with polypropylene fibres´addition - study of the rheological and mechanical behavior.

AUTOR(ES)

Rosiany da Paixão Silva

DATA DE PUBLICAÇÃO

2006

RESUMO

Many designers and constructors have been looking for alternative solutions trying to avoid types of anomalies in the mortar rendering. One of these solutions is the application of mortar with fibres’ addition. However, the knowledge concerning the composite behavior is very empirical, mainly in Brazil where there are no systematic researches about this subject. From this context, the objective of this job is to investigate the influence of the polypropylene fibres’ addition in the rheological and mechanical behavior of the mortar applied in rendering. For the study of the rheological behavior, laboratory evaluations were done using the following methods: dropping ball and squeeze flow. Furthermore, for the applicability evaluation, the knowledge of an expert was taken into account. For the study of the mechanical behavior, laboratory evaluations were done using the following methods: evaluation of the flexural strength, compressive strenght and dynamic elastic modulus. In this job, the mortar composites present variation in the matrice and fibre. The variation in the matrice involves the mortar type and the water dosage. Two mortars widely used in the civil construction market were used in this present work: one with low air voids formation (about 5%) and other with high air voids formation (about 30%). Six water percentages were also used in the matrice variation. Polypropylene fibres with length 6mm were used in the fibre variation. Five different fibre percentages were used in the mixes. As results, the fibres’ addition evidenced alterations in the mortars rheological due (not only) to physicals and mechanicals characteristics, but also because when the fibres were inserted, they modified the characteristics of the original matrice strongly, as for example, the alteration of the incorporated air percentage. So, the fibres’ addition in the mortar with low air voids formation increased the air formation; while in the mortar with high air voids formation, the fibres’ addition decreased the air formation. These alterations evidenced the specifics applicability conditions for each type of mortar. The mortar mechanical behavior also was altered. Inside the “rheological modifications” studied, the fibre percentage in the mortar with low air voids formation was what more contributed with the alteration of the mechanical property; while that the mortar with high air voids formation, the water percentage is what more affected the mechanical behavior.

ASSUNTO(S)

revestimento de argamassa fibra de polipropileno resistência mecânica argamassa para revestimento rheological and mechanical behavior reologia mechanical resistance mortar rendering mortar for the rendering trabalhabilidade polypropylene fibers

Documentos Relacionados

• Método de formulação de argamassas de revestimento baseado em distribuição granulométrica e comportamento reológico.
• Influência da sequência de adição de fibras e da água no comportamento de mistura e reológico de argamassas com fibras de PVA
• Comportamento mecânico de concreto compactado com rolo reforçado com fibras de polipropileno
• Comportamento reologico de chocolates ao leite sem fibras e enriquecido com fibras soluveis
• ESTUDO DO COMPORTAMENTO MECÂNICO DE BLOCOS CERÂMICOS COM DIFERENTES LARGURAS