Analysis of use of natural fibers and asphalt rubber binder in discontinuous asphalt mixtures

The use of additives for the improvement of the mechanical behavior of high modulus asphalt mixes

“…As can be observed, the incorporation of the additives tested in this research (acrylic fibers or crumb rubber) induces a decrease in the indirect tensile resistance of the high modulus asphalt mixtures, especially when crumb rubber is used (which could be due to a lack of interaction between the hard bitumen and the crumb rubber particles [20]). These results agree with those obtained by other researchers where the tensile resistance of asphalt mixtures drops when fibers [21][22][23] or crumb rubber [24,25] are added. The HMAM-BM1 offers the highest resistance, which proves the efficiency of the SBS polymers in the improvement of the mechanical response of the mixture.…”

“…Special attention should be paid to the case of acrylic fibers (HMAM-AF). In this case, the use of this type of additive reduces the stiffness of the asphalt mixture making it more flexible (as occurs when cellulose or polyester fibers are used [21,30]). As observed in previous tests, this aspect has not had a negative effect in the resistance to plastic deformations, so if both results are combined, it could be said that an improvement in the general performance could be achieved.…”

Experimental investigation on mineral and organic fibers effect on resilient modulus and dynamic creep of stone matrix asphalt and continuous graded mixtures in three temperature levels

“…Using fibers increased Marshall Stability and decreased bulk density of mixtures [19]. Natural fibers and asphalt rubber binder use in gap graded asphalt mixtures such as SMA was evaluated in a research to utilize residues fibers replacing expensive imported fibers in Brazil [20]. Ahmadinia et al utilized waste Polyethylene Terephthalate (PET) in SMA [16].…”

Dosagem de mistura asfáltica com CAP 50/70 modificado com borra de petróleo

“…Estudos científicos têm mostrado que a utilização de asfaltos modificados por polímeros propicia uma melhoria na resistência à formação de trilhas de roda e ao trincamento por fadiga, aumento da resistência ao envelhecimento, diminuição da susceptibilidade térmica, melhor característica coesiva e adesiva, elevação do ponto de amolecimento, dentre outros benefícios [9,10].…”