Modificação de Asfalto
Possibilitando estradas mais seguras e sustentáveis com modifers de asfalto
As estradas lisas são estradas mais seguras. O pavimento tradicional muitas vezes falha ao rachar, descascar, craquear a frio e craquear por fadiga, fazendo com que o pavimento se deforme ao longo do tempo. O asfalto modificado por polímero oferece desempenho duradouro de pavimento rodoviário, permitindo superfícies mais suaves para a segurança rodoviária, não importa o clima. Faça seu pavimento durar mais e fique mais seguro com estes benefícios modificadores de asfalto:
- Lida com mais de duas vezes a carga de tráfego
- Usa 10% menos energia no processamento e armazenamento
- Aumenta a durabilidade do asfalto em até 30%
- Resiste a rachaduras e sulcos a frio
- Adequado para cargas pesadas de transporte
- Resistente a combustível
- Espalhamento suave e fácil trabalho manual para aplicação mais rápida
Minimize os problemas causados pela umidade, deformação e desgaste, fornecendo uma superfície segura e confiável.
- Aumentar a força de ligação entre o asfalto e os agregados para proteger contra decapagem com nosso amplo portfólio de produtos de aminas
- Melhor aplicação e uso de energia com surfactantes para aditivos de mistura a frio
Across the globe roads need to withstand moisture and temperature cycling, especially in freeze-thaw cycles. Asphaltic cement enhanced by ELVALOY™ Reactive Elastomeric Terpolymers (RET) is shown in lab tests to improve pavement service life in these conditions, due to reduced moisture susceptibility causing better asphalt binder adhesion to aggregate.
Tested and successful results
The U.S. Federal Highway Administration conducted a study to determine the effects of 11 asphalt binders on the moisture sensitivity of mixtures, using a Hamburg Wheel-Tracking Device (Hamburg WTD). The results showed that only the mixture with ELVALOY™ RET performed better than the PG 70-22 control mixture at a 5-percent level of significance.3
On a highway in India side-by-side lane inspection was conducted. Binder made with ELVALOY™ RET asphalt modifier was used alongside an unmodified binder. The side-by-side lanes were observed and photographed years later, showing a visible difference in binder retention—ELVALOY™ RET offering the stronger performance.
3“Understanding the Performance of Modified Asphalt Binders in Mixtures: Evaluation of Moisture Sensitivity” (FHWA-RD-02-029) by Kevin D. Stuart, John S. Youtcheff and Walaa S. Mowager
Cracks happen when temperatures change, and the pavement expands and contracts beyond the binder’s ability to stretch or compress to conform to the movements. Studies have shown that by creating a more resilient binder at a molecular level, ELVALOY™ RET asphalt modifier can minimize cold and thermal cracks.
Bending beam tests demonstrate cold-temperature performance
The cracking temperatures for asphalt binders provided by the Bending Beam Rheometer (BBR) and Thermal Stress Analysis Routine (TSARTM) were studied by the U.S. Federal Highway Administration (FHWA Report RD 02 075). Low-temperature mixture properties provided by the Thermal Stress Restrained Specimen Test (TSRST) were used to validate these asphalt binder tests. An emphasis was placed on evaluating the performances of mixtures containing polymer modified asphalt binders with identical Superpave performance grades (PG's) and similar base asphalts, but varied modification chemistries. ELVALOY™ RET broadly outperformed grafted styrene butadiene styrene (SBS) in these tests.
Compare the cycles to failure for eight asphalts
Eleven binders were used in this study of fatigue failure. They included eight polymer modified asphalt binders of PG70-28, using the following polymers: ELVALOY™ RET, SBS linear-grafted, SBS linear, SBS radial-grafted, ethylene vinyl acetate (EVA), EVA grafted, ethylene styrene interpolymer (ESI), and chemically modified crumb rubber. Bending beam fatigue tests were performed according to the AASHTO provisional test method TP8-94 (10). The tests were conducted in the strain-controlled mode at a high strain level of 1000 microstrains and at a test temperature of 19C.4
Several different data analytical methods were compared, with a consistent result. The mixes made with ELVALOY™ RET far outdistanced the other samples in terms of cycles to failure.
4 “A Distinctive Fatigue Failure Criterion” January 2004, Asphalt Paving Technology: Association of Asphalt Paving Technologists-Proceedings of the Technical Sessions 73:585- 622 by Ghazi Al-Khateeb and Aroon Shenoy.
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