Accelerated Weathering
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Lignin-modified road marking paint: weathering aging studies
Abstract The accelerated artificial aging with ultraviolet radiation, viscosity, density, no-pick-up time, flexibility, and abrasion resistance of lignin-modified road marking paint were evaluated. The addition of lignin did not cause significant changes in the physical chemistry, flexibility and no-pick-time test compared to the precursor paint. The additio
REM, Int. Eng. J.. Publicado em: 2021-06
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2. SISTEMAS PEDOGEOMORFOLÓGICOS NA INTERPRETAÇÃO DA EVOLUÇÃO DE PAISAGENS QUATERNÁRIAS EM CLIMAS TROPICAIS ÚMIDOS
Resumo As relações entre solo e relevo são constantes em paisagens de climas tropicais e subtropicais úmidos, devido aos espessos mantos regolíticos resultantes de acelerado intemperismo físico, químico e biológico. A investigação dos sistemas pedogeomorfológicos merece destaque em análises sistêmicas, que objetivam o estudo da gênese e dos pro
Mercator (Fortaleza). Publicado em: 09/12/2019
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3. Weathering Resistance of Waterborne Polyurethane Coatings Reinforced with Silica from Rice Husk Ash
Abstract: Waterborne polyurethanes (WPUs) are interesting materials for coatings when compared to solvent-based polyurethanes, once that reducing the concentration of volatile organic compounds that are harmful for human health and the environment. However, the WPU has low weathering resistance. In order to improve this behavior among others properties, ino
An. Acad. Bras. Ciênc.. Publicado em: 25/11/2019
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4. Comportamiento bi-modal de una fundición gris y un acero estructural al carbono en corrosión atmosférica marina acelerada
ABSTRACT According to data gathered in the last Metal Foundry Industrial Production Survey [1], approximately 46% of the industrial production of ferrous alloys is gray-iron. In this context the study of the atmospheric corrosion resistance of gray-iron becomes interesting to asset its useful life when subject to weathering conditions. The studies of gray-ir
Matéria (Rio J.). Publicado em: 22/06/2017
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5. Synthesis and photostabilizing performance of a polymeric HALS based on 1,2,2,6,6-pentamethylpiperidine and vinyl acetate
Polymeric hindered amine light stabilizers (polymeric HALS) have been extensively studied because they combine a high ability to protect the polymers against harmful effects of weathering with minimum physical loss. In this study a new polymeric N-methylated HALS was synthesized by the radical copolymerization of a cyclic tertiary amine with vinyl acetate (V
Polímeros. Publicado em: 04/12/2015
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6. Influencia de Ni y Ti en la respuesta a la corrosión marina simulada de un acero autopatinable A242
ABSTRACTThere is a great interest in the steel industry to incorporate new products in the market with better properties of those already in production. Among these properties, corrosion resistance is of great importance for countries with a large marine seacoast, like Chile, where chloride ions from sea spray produce corrosion, leading to irreversible failu
Matéria (Rio J.). Publicado em: 2015-09
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7. Effect of Weathering and Accelerated Photoaging on PET/PC (80/20 wt/wt%) Melt Extruded Blend
In this study we investigated the natural weathering of a catalyzed blend of poly(ethylene terephthalate)/polycarbonate PET/PC (80/20wt/wt%). The results were compared to the accelerated photoaging tests. The specimens were characterized by wide angle X-ray diffraction (WAXD), optical microscopy (OM), thermogravimetry (TG/DTG), medium infrared spectroscopy (
Mat. Res.. Publicado em: 25/08/2015
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8. Alteração e alterabilidade de rochas básicas intrusivas metamorfizadas e filitos sericíticos da região do Quadrilátero Ferrífero e sua implicação no comportamento mecânico / Weathering and weatherability of metamorphised intrusive igneous rocks and sericitic phylites of the Iron Quadrangle and its implication on their mechanical behaviour
The present work presents the results of physical, mechanical and mineralogical study of two rock types commonly found at Quadrilátero Ferrífero region (Minas Gerais State, Brazil). The main purpose of the study was to characterize the weatherability of those rocks when exposed to weathering agents that may cause problems in some civil engineering works, m
Publicado em: 2008
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9. STUDY OF HMS-PP (HIGH MELT STRENGTH POLYPROPYLENE) BEHAVIOUR UNDER CONDITIONS OF ENVIRONMENTAL AND ACCELERATED DEGRADATION / Estudo do comportamento de HMS-PP (polipropileno com alta resistência do fundido) sob condições de degradação ambiental e acelerada
The behaviour study of polymeric materials concerning the weathering (heat, uv light, moisture, high-energy radiation, chemical attack and pollutants) is of fundamental importance to assess the stability of the material. The thermoplastics evaluated were the stabilized and not stabilized HMS-PP synthetized by gamma (g) irradiation under acetylene atmosphere.
Publicado em: 2008
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10. EFEITO DA RADIAÇÃO SOLAR NO ENVELHECIMENTO DO CONCRETO BETUMINOSO USINADO A QUENTE
The asphalt aging due to the action of the solar radiation can be considered in the study of the performance of asphalt pavement, especially in Brazil, where the sunstroke is very important. The aim of this work is to simulate and investigate the asphalt aging due to the solar radiation effect. The hot worked bituminous cement was submitted to the weather-O-
Publicado em: 2007
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11. Procedimentos para avaliação da degradação de reservatórios de polietileno para água potável expostos às intempéries. / Procedures for the evaluation of the degradation of polyethylene potable water tanks exposed to weathering.
O trabalho propõe procedimentos para a avaliação da degradação mecânica de reservatórios de polietileno para água potável expostos às intempéries nas edificações brasileiras. Tais procedimentos envolvem a comparação das propriedades mecânicas antes e após a exposição acelerada de corpos de prova retirados de reservatórios de polietileno e
Publicado em: 2004
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12. Estudo de argamassas com agregados reciclados contaminados por gesso de construção. / A study on mortars produced with CDW recycled aggregates containing cypsum plaster as impurity.
This is an abstract of a Master of Science project carried out at EPUSP, Universidade de São Paulo, Brazil, aimed at investigating the effects of the use of recycled aggregates contaminated by small contents of gypsum plaster on masonry mortars. In the presence of moisture and by the action of gypsum minerals or other more complex ones that may occur, there
Publicado em: 2004