RESUMOEm função do elevado consumo de concreto, tanto em nível nacional, como em nível internacional, o uso de vários rejeitos industriais como matéria-prima para a sua elaboração tem dado destaque ao concreto como sendo um material ecologicamente compatível com o desenvolvimento sustentável. A maioria dos concretos é obtida a partir de misturas que utilizam agregados naturais, tendo-se, como exemplo, a areia natural e a brita. A retirada de areia de um rio pode agredir sua calha natural, levar a um aumento da vazão de água e acelerar o ritmo de erosão das margens. Por sua vez, o pó de pedra é um rejeito do processo de extração das britas, não possui destinação

The aim of this paper is to evaluate through bending tests the structural behavior of reinforced concrete beams additionally reinforced with bamboo splints coated with rubber latex. The bamboo splints are prepared from the stems of the Bambusa vulgaris species and are reinforced in the nodal regions. To examine the strength of adhesion between the bamboo splint and concrete, pull out tests are performed for the specimens. The results of the pullout tests of the test samples show the strengthening of the nodes leading to an increase in the normal tension and rupture of the splint instead of its slip. According to the results of the bending beams, the presence of bamboo splints increases their load capacity when compared with the reference beams. This fact indicates a reduction in the amount of steel required as the structural element. Strengthening the nodes of the bamboo splints provides better performance in terms of deflection and also leads to a slight increase in the beams load capacity. It is worth mentioning that the beams additionally reinforced with bamboo splints reinforced in the nodal region present the same cracking pattern as that of reference beams.

Estudo dos resíduos dos fornos de cerâmica para a produção de concretos de cimento Portland Study of ceramic furnace wastes for the production of portland cement concretes

No abstract

The paper discusses the application of High Strength Concrete (HSC) technology for concrete production with the incorporation of Rice Husk Ash (RHA) residues by replacing a bulk of the material caking and rubber tires with partial aggregate volume, assessing their influence on the mechanical properties and durability. For concrete with RHA and rubber, it was possible to reduce the brittleness by increasing the energy absorbing capacity. With respect to abrasion, the RHA and rubber concretes showed lower mass loss than the concrete without residues, indicating that this material is attractive to be used in paving. It is thus hoped that these residues may represent a technological and ecological alternative for the production of concrete in construction works.