Commercial plaster (CaSO4•1/2H2O) is a material used in building construction all over the world. This construction material is used renderings in internal and dry environment because it is soluble in water. According to different studies, the plaster manually applied as renderings produces high volume of material loss (values varying from 18% to 35%). In this way, the aim of this work was to study the physical and mechanical properties from pastes made with commercial plaster and pastes obtained from hydrated plaster that was lost from their applications (recycled plaster). The recycled plaster was grounded and burnt at different temperatures in order to loose its non-evaporated water and to make possible its reuse as binder. After burning, their physical and mechanical properties were studied. The results showed that recycled plaster had a good performance as binder. Their physical and mechanical properties related to commercial plaster were very similar. In this way, the results show that it is possible to reuse the recycled plaster as binder again, which permit to contribute to a sustainable construction.

Agradeço a todos, que estando presentes ou distantes contribuíram para a realização desta tese de doutorado, com os quais gostaria de compartilhar este trabalho.Em especial à minha mãe, meu irmão e sua família, e meu tio Décio (meu segundo pai), que mesmo de longe se fizeram presentes no meu dia a dia, e foram os maiores motivos de minha dedicação.A meu pai (in memorian) que pela vontade de DEUS não teve a oportunidade de compartilhar comigo esta realização.À Professora Doutora Gladis Camarini, pela orientação recebida, pelo apoio incansável na realização da pesquisa e pela dedicação na fase de elaboração deste trabalho.

This work presents part of a study whose main objective is to observe the behavior of the physical and mechanical properties of the materials (raw material) and of products made for the civil construction from the precast concrete industry, such as concrete blocks and pavers for interlocking floors. Through the investigation, was identified the potential of using the concrete blocks waste of the production as aggregates added to the concretes utilized to produce pavers. Thus, it is expected that this work contributes as a basis for obtaining scientific and technical knowledge regarding the materials and procedures that must be adopted for the manufacture of pavers, allowing their production for commercialization.

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