Usability of Hemp Fiber in Dense Graded Hot Mix Asphalt Mixture

Sebnem Karahancer, Ekinhan Eriskin, Kemal Armagan, Nihat Morova, Mehmet Saltan, Serdal Terzi

Last modified: 2019-03-01


The usage of fibers as an additive to reinforce the paving material have a long history like decades in the World. In stone matrix, open graded or porous mixtures, these fibers were commonly used to increase the adhesion between aggregate and binder and this property was usable in asphalt mixture for preventing the drain down of binder. Also, fibers were used for improving crack resistance and increasing stability in dense graded asphalt mixtures too. As, the aphalt is generally acknowledged as a strong material for compression loads and weak for tension loads. In theory, fibers that have high tensile strength can reduce the stresses relatively to weak asphalt mixtures by transferring the stresses for increasing the tensile strength of the mixture. For investigating the efficiency of the fibers there have been many types and forms of fibers used either experimentally or routinely in asphalt mixtures. These investigations leaded researchers to the plant-based fibers like woody (such as jute, flax, straw, and hemp), leaves and seeds. For this aim the usability of hemp fiber examined in this study. For examining the test results, specimens were prepared in four different proportions including reference specimens. Volumetric mix design was used to determine the optimum bitumen content. Then Indirect Tensile (IDT) Strength Test was applied to HMA specimens.


hemp, fiber, dense grade, hot mix asphalt, indirect tensile strength

Full Text: PDF