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Influência do fíler mineral em propriedades de misturas asfálticas densas
| Content Provider | Semantic Scholar |
|---|---|
| Author | Bardini, Vivian Silveira Dos Santos |
| Copyright Year | 2013 |
| Abstract | BARDINI, V.S.S. Mineral Filler Influence on Hot Mix Asphalt Properties. 2013. 337 p. Thesis (Phd). Escola de Engenharia de São Carlos, Universidade de São Paulo, São Carlos, 2013. The objective of this research is to contribute to the better understanding of mineral filler effects on the mechanical behavior of hot mix asphalt (HMA), particularly related to the filler type and content. The hot mix asphalt mechanical behavior was evaluated according to: the filler type and content (different physical, geometrical and mineralogical properties); the aggregate type (different mineralogical source); and the asphalt binder type (different consistency). To reach the global objective, the research was divided in three parts: the study of the complete HMA, through the mechanical tests; the study of the mastic, resulting from mixture of mineral filler and asphalt binder, through tests commonly applied to pure asphalt binder; and the study of cracking performance behavior at intermediate temperature, through the fracture energy characteristics. The analysis of variance of the results assisted to identify the factors with significant influence in properties of the hot mix and mastic asphalt. Regarding the results of the fatigue life, the HMA composed with the hydrated lime presented the longer fatigue life and the higher the filler content the longer the fatigue life. Related to the permanent deformation, the HMA containing the lowest content of filler presented the lowest non-recoverable strain, while the HMA containing an intermediate value of filler presented the highest values. The mastics rheological properties showed that addition of filler makes the asphalt binder stiffer, and the hydrated lime causes the greatest increase of G*. The mastic elasticity increases with the filler, and it’s more notorious when the mastic is composed by the hydrated lime and Portland cement. The higher the filler content, the higher the temperature corresponding to G*/senδ ≥ 1,0 kPa of the Superpave specification, which may be reflected in HMA with higher permanent deformation resistance. At low temperature properties, the use of higher filler content prejudice the low temperatures cracking response, and decrease the efficiency of stress dissipation formed during contraction of the asphalt binder when the pavement temperature drops abruptly, increasing the formation of cracks and fissures. Analyzing the energy fracture results, adding filler to the mastic decrease the cracking resistance by fatigue at intermediate temperature, but the filler presence in the mixture during aging makes the effect less damaging. |
| File Format | PDF HTM / HTML |
| DOI | 10.11606/T.18.2013.tde-17052013-090958 |
| Alternate Webpage(s) | https://teses.usp.br/teses/disponiveis/18/18143/tde-17052013-090958/publico/VivianBardini.pdf |
| Alternate Webpage(s) | https://doi.org/10.11606/T.18.2013.tde-17052013-090958 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
