Investigation of the usability of aggregates produced from sea shell in SMA pavements with different addition methods

The usability of waste seashell aggregates instead of basalt aggregate in stone mastic asphalt (SMA) mixtures was investigated. Maximum size of the seashell aggregates were choosen as 0.425 mm, 0.180 mm, and 0.075 mm. The rate of seashell aggregate was applied as 5%. In addition, the effects of the methods of adding seashell fillers to basalt aggregate by dry aggregate method, moist aggregate method, and slurry method were investigated. The use of seashell aggregates has been found to increase the stability, low temperature cracking resistance, water damage resistance, and deformation resistance of SMA mixtures. It was found that with the reduction of the seashell aggregate size, the improvement in the mechanical properties of the mixture increased, and the best properties were obtained with the use of seashell in filler size. When evaluated in terms of filler addition methods, the moist aggregate method gives better results than the slurry method and dry aggregate method.