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

• This study considered effects of two fibers on SMA and HMA mixtures properties.
• HMA mixtures showed significantly higher resilient modulus than SMA.
• Rutting potential of HMA mixtures was lower than SMA.
• In higher temperatures more fiber content is required to improve properties.

Two fiber types were used in this study to evaluate resilient modulus and dynamic creep behavior of stone matrix asphalt and continuous graded hot mixed asphalt versus various fiber contents in three levels of temperature. Generally, continuous graded mixtures presented better mechanical properties in both resilient modulus and dynamic creep tests. Fibers have shown great effect not only on asphalt drain-down, but on mechanical properties of samples. Considering the temperature effect, the higher the temperature is, the higher fiber content is required to improve mechanical characteristics of asphalt concrete.