Effect of geosynthetic reinforcement insertion on mechanical properties of hot and cold asphalt mixtures
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International Journal of Pavement Research and Technology Journal homepage: www.springer.com/42947
Effect of geosynthetic reinforcement insertion on mechanical properties of hot and cold asphalt mixtures Géssica Soares Pereira*, Heraldo Nunes Pitanga, Taciano Oliveira da Silva, Déborah Castro e Almeida, Kamila Bazoni Lunz Civil Engineering Department, Federal University of Viçosa, Viçosa, Minas Gerais, Brazil Received 26 March 2020; received in revised form 13 September 2020; accepted 3 October 2020
Abstract
The main objective of this research is to analyze the effect of the insertion of a geogrid reinforcement in the mechanical behavior of the hot mix asphalt (HMA) and the cold mix asphalt (CMA). For this purpose, an experimental program was developed, in which HMA and CMA were desi gned by the Marshall mix design method and specimens with and without a geogrid were molded. The mechanical properties were investigated through tensile strength (Brazilian test), resilient modulus and Marshall Stability tests. The insertion of the geogrid into the HMA provide an increase in the r esponses of reinforced specimens for the three analyzed tests, which is not observed in the CMA. The adhesion between the asphalt mixture and the geogrid is observed only in the hot asphalt mixture. Therefore, its mobilization shows to be dependent on the temperature of the asphalt mixture, which alters the viscosity of the asphalt binder. It is assumed that the geogrid reinforcement is mobilized due to the adhesion between this geosynthetic element and the hot asphalt mixture. Additionally, the trapping of the asphalt mixture in the geogrid mesh openings provides the formation of a structural system with higher interlocking, lower susceptibility to deformations and as a consequence greater mechanical strength and stiffness, in comparison to unreinforced systems. Keywords: Asphalt mixtures; Geogrid; Hot mix asphalt (HMA); Cold mix asphalt (CMA); Interaction mechanisms
1. Introduction In road engineering, most of the pavement structures have the asphalt layer composed of asphalt mixtures. Two main options of this paving material are hot mix asphalt (HMA) and cold mix asphalt (CMA). As the name implies, HMA is a mixture of aggregates and asphalt cement that requires heating before installation. Hot mix asphalt is more useful for large-scale paving applications because it can resist all types of weather and is the most durable grade of paving asphalt. On the other hand, CMAs are the most basic asphalt types and are much more affordable than hot mix asphalt. As they can be laid in colder temperatures, health risks are reduced because heating of materials is not required for application, and furthermore, they can provide a longer storage time than hot mix asphalt.
* Corresponding author E-mail addresses: [email protected] (G. S. Pereira); [email protected] (H. N. Pitanga); [email protected] (T. O. da Silva); [email protected] (D. C. Almeida); [email protected] (K. B. Lunz). Peer review under responsibility of Chinese Soci
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