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Estudo laboratorial de misturas asfálticas a frio produzidas com incorporação de borracha de pneus
| Content Provider | Semantic Scholar |
|---|---|
| Author | Clerman, Danielle De Souza |
| Copyright Year | 2004 |
| Abstract | CLERMAN, D.S. Estudo Laboratorial de Misturas Asfalticas a Frio Produzidas com Incorporacao de Borracha de Pneus. 2004. Tese (Mestrado em Geotecnia) – Programa de Pos-Graduacao em Engenharia Civil, UFRGS, Porto Alegre. Laboratorial Study of Cold Asphalt Mixes with Tire Rubber Addition The addition of polymers into asphaltic mixes has been used for many years, becoming possible asphaltic applications and getting better its characteristics. For many years, with an increasing discussion about environmental conservation regarding solid residues, the addition of old tires rubber as an additive for hot asphalt mixes has been accepted as a viable methodology for pavements with great results. However, few studies have been conducted in order to investigate the performance of rubber asphalt in cold mixes. Cold mixes are an alternative for low and medium volume road construction. This work aims to investigate the use of tire recycled rubber as an aggregate in cold mixes, demonstrating the benefits of this technology and results as ecological advantages and energetic saves. Laboratorial mechanical tests such as dynamic indirect tensile test (resilient modulus) and indirect tensile test (tensile strength), carried out in two cure times, are responsible for the characterization of mixes with conventional cationic asphaltic emulsion and SBR type. Dense and open graded mixes have been used. The crumb rubber has been incorporated in emulsion as part of the weight of aggregate, 1% and 2% in two gradations 0,18 mm and 0,42 mm. This process is known as dry process for hot mixes. This work follows the Marshall procedure to establish the minimum asphalt content. The dense mixes showed higher asphalt contents than conventional mixes. However, stability decreased with rubber contents addiction for open graded mixes. Adding the thinnest rubber, superior tensile strengths were obtained for all mixes. The resilient modulus decreased as higher and larger rubber contents were added. Usually, dense mixes showed better results than open mixes for adding tire rubber. Crumb rubber modifier appears to be performing satisfactorily in cold mixes showing to be a viable technology with environmental saves. Key-words: asphaltic emulsion; cold mixes; tires rubber;dry process. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.lume.ufrgs.br/bitstream/handle/10183/4493/000457198.pdf?sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
