resumoA forma dos grãos tem importante papel na avaliação da distribuição granulométrica das partículas de um solo. Entretanto, a maioria das técnicas de peneiramento evidencia que os grãos são esféricos e descritos por um único parâmetro, o diâmetro. Este trabalho teve por objetivo estudar a aplicação da análise de imagens, aliada ao grau de esfericidade e à teoria dos fractais, como ferramenta para mensurar parâmetros de forma e textura superficial de duas areias de características supostamente distintas da região da Grande Vitória, Espírito Santo, Brasil. Os resultados dos parâmetros de forma e textura superficial das amostras são apresentados e discutidos. As análises dos resultados para a variável esfericidade mostram diferenças estatísticas significativas entre as duas areias de origens diferentes. A areia de jazida de cordão litorâneo (AJ) apresentou grau de esfericidade ligeiramente superior e textura superficial mais lisa do que a de rio (AR), indicando que as areias AJ sofreram maior intemperismo em razão do transporte. Palavras-chave: parâmetros texturais, análise computacional, teoria dos fractais.aBstraCt: use of image analysis to determine the shape and texture of sands the shape of sand grains plays an important role in evaluation of soil particle size distribution. however, in most sieving techniques it is assumed that grains are spherical and can be described by a single parameter, diameter. moreover, the subjectivity of the tests used to estimate sand roughness Recebido para publicação em 5 de maio de 2014 e aprovado em 10 de outubro de 2014.
Study of cement pastes rheological behavior using dynamic shear rheometer Abstract ResumoConcrete, in its fresh state, has flow characteristics that are crucial to its proper launch and densification. These characteristics are usually measured through empirical testing as the slump test, but this test does not quantify completely the material behavior. Since this material is characterized as a Bingham fluid, it is essential the study of its rheological behavior to verify its properties even in fresh state. The use of classical rheology has been employed by the scientific community to obtain rheological parameters determinants to characterize this material, such as yield stress, plastic viscosity and evolution of shear stress to shear rate. Thus, this present study aims to determine the rheological behavior of different cement pastes produced with cement CP III 40 RS, varying between them the hydration periods (20 and 60 min), the water-cement ratio (0.40, 0.45 and 0.50) and the use or not of additive. Samples were assayed by flow test to determine the rheological parameters showing the effect of the variables mentioned above in these parameters.
The hydraulic tile is a cement material produced in a handmade way, pressed, composed by three layers. With the coming of sidewalks adaptation in accessibility patterns, the tactile-floor tile hydraulic was developed to constitute the floor strip of alert for vision disabled people. The work has the objective to develop the mix design of the tile containing hydraulic binder with addition of granite residue. Properties analyzed: water absorption, rupture load, flexural modulus and wear by abrasion test. It was verified that the addition of residue to the tile, that it acted as a filler, promoted improvements in the analyzed properties; which makes the addition of granite residue an alternative technically feasible for the use in sidewalks and also a contribution to the sustainable development of the sector of granite improvement.Keywords: tactile-floor tile hydraulic, residue improvement dimension stone, accessibility, sustainability, recycling.O ladrilho hidráulico é um material cimentíceo produzido de forma artesanal, prensado, composto de três camadas. Com o advento da adaptação de calçadas em padrões de acessibilidade, foi desenvolvido o ladrilho hidráulico piso tátil para constituir a faixa de piso de alerta para deficientes visuais. O trabalho tem como objetivo desenvolver a dosagem do ladrilho contendo aglomerante hidráulico com adição de resíduo de granito. Foram analisadas as propriedades: absorção de água, carga de ruptura, módulo de resistência à flexão e a resistência ao desgaste por abrasão. Foi verificado que a adição do resíduo ao ladrilho, que agiu como um fíler, promoveu melhorias nas propriedades analisadas, o que faz com que a adição de resíduo de granito seja uma alternativa tecnicamente viável para uso em calçadas e contribua para o desenvolvimento sustentável do setor de beneficiamento de granito.Palavras-chave: ladrilho hidráulico piso tátil, resíduo de beneficiamento de rochas ornamentais, acessibilidade, sustentabilidade, reciclagem. CT, fernandoavancini@ct.ufes.br, Av. Fernando Ferrari, n°514, Goiabeiras -CEP 29075-973 -, Vitória -Espirito Santo -Brasil Received: 18 Mar 2009 • Accepted: 24 Aug 2010 • Available Online: 17 Dec 2010 Tactile-floor tile hydraulic with addition residue improvement dimension stones AbstractResumo Volume 3, Number 4 (December, 2010) p. 390 -419 • ISSN 1983 © 2010 IBRACON MethodologyInitially, the material components of hydraulic tile and the residue to be added into the formulation were characterized. Tile hydraulic factories in the state of Espirito Santo were visited in order to study the methodology for mix design of hydraulic tile, and from that point, the experimental study of mix design of tactile-floor hydraulic tile with added residue began, as well as the verification of properties of the hydraulic tiles obtained in LEMAC UFES. Characterization of materialsThe materials that make up the hydraulic tiles are divided into three layers, namely:• top layer -composed of Portland cement CPIII40RS, residue, water and pigment Bayferrox 732;
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