Experimental design methods used in optimization of engineering problems and processes in many industrial fields have been shown to be applicable in road superstructures within this study. Using the special purpose statistical experiment design program, optimization studies have been carried out on Marshall design performance criteria which are widely applied in asphalt concrete design in many countries. Experiment strategy was established by using response surface methods (RSM). Four factors affecting the process were identified and four dependent variables were evaluated as performance criteria. Mathematical models of dependent variables were generated and statistical analyzes were performed. The identified factors are ranked at the desirable level by evaluating them under optimum conditions. Experimental design techniques are used to reduce the number of experiments according to normal conditions, so that time-consuming laboratory studies will be performed in a shorter time. It is shown that experimental design methods can provide advantages in determining these effects in a short period of time, given that there are dozens of unknown additives in road superstructures. Considering investments in road pavements and limited economic opportunities, the use of innovative approaches such as experimental design techniques in superstructure performance research is important in managing these p  

Keywords - Experimental design, Optimization, Marshall design, Response surface Method, Asphalt concrete

[1] D. C. Montgomery, Design and Analysis of Experiments, 7th ed., John Wiley & Sons, New-York, 2009.
[2] R. H. Myers, Response Surface Methodology, Boston, MA: Allyn and Bacon, 1971.
[3] N. Bradley, The Response Surface Methodology, Indiana University South Bend, 2007.
[4] D. Ç. Karakuş, “Kalite Fonksiyonları Geliştirme, Olası Hata Türü ve Etkilieri Analizi ve Deneylerin Tasarımı Tekniklerinin Entegre Kullanımı”, Yüksek Lisans Tezi, İstanbul Teknik Üniversitesi, Türkiye ,2001.
[5] M. O. Hamzah, B. Golchin, C. T. Tye, “Determination of the optimum binder content of warm mix asphalt incorporating rediset using response surface method,” International Journal of Pavement Engineering, 18, pp. 682-692, 2017.
[6] A. Khodaii, M. Khedmati, H.F. Hangshenas, M. Khedmati, “Statistical evaluation of hot mix asphalt resilient modulus using a central composite design”, International Journal of Pavement Research and technology, 7(6), pp. 445-450, 201.4
[7] R. Namlı, N. Kuloğlu, “Superpave ve Marshall Yöntemlerinin Deneysel Karşılaştırılması”,İMO Teknik Dergi, Yazı 270, pp. 4103-4118,2007.
[8] P. Ahmetzade, M. Tıgdemir, and S.F. Kalyoncuoglu,”Laboratory investigation of the properties of asphalt concrete mixtures modified with TOP-SBS”, Construction and Building Materials, 21 (3), 626- 633,2007.