Student:	Kübra ÇEVRİM
Supervisor:	Doç. Dr. Erol İSKENDER
Department:	İnşaat Mühendisliği
Institution:	Graduate School of Natural and Applied Sciences
University:	Karadeniz Technical University Turkey

Title of the Thesis:	INVESTIGATION OF SEASHELLS AS ADDITIVE IN STONE MASTIC ASPHALT MIXTURES IN TERMS OF GRADATION AND ADDING METHOD
Level:	M.Sc.
Acceptance Date:	17/2/2021
Number of Pages:	87
Registration Number:	i3854

Summary:

In this thesis study, the usability of waste seashell aggregates instead of basalt

aggregate in stone mastic asphalt mixtures was investigated. The seashells obtained as

waste were crushed and added by 5% in proportion to the same gradation instead of natural

basalt aggregate. Different options were created by changing the maximum size of the

seashell aggregate as 0.425 mm, 0.180 mm and 0.075 mm. 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. Stone mastic asphalt mixtures are

designed according to the Marshall method. Modified Lottman, indirect tensile strength,

Marshall stability, Hamburg wheel track and repeated creep tests were performed on the

mixtures. The use of seashell aggregates has been found to increase the stability, low

temperature cracking resistance, water damage resistance and deformation resistance of

stone mastic asphalt 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 achieved by adding fillers in size. When evaluated in terms of

filler addition methods, the moist aggregate method gives better results than the slurry

method and dry aggregate method.

Key Words: Stone mastic asphalt, Seashell, Waste management, Modified Lottman test,

Indirect tensile strength test, Marshall stability test, Hamburg wheel tracking

test, Repeated creep test, Water damage