Evaluation of the dual additive effect of rubber powder and PET numerically and laboratory in Hot asphalt mixture

Document Type : Research Article

Authors

1 graduated from civil engineering department , Iran university of science and technology

2 Department of Civil Engineering, Iran University of Science and Technology, Tehran, Iran

3 Department of Civil Engineering, Malayer University, Malayer, Iran

4 Assistant professor in structural Eng., Department of Civil Engineering, Qom University of Technology (QUT), Qom, Iran

Abstract

Simulteness of this two additive due to take advantage of softing property of crumb rubber and harddenin property of PET can be lead to elimation of these two material from the nature as well as making more resistance asphalt mixture. The additive used in this study is a combination of rubber powder and polyethylene terephthalate, which is found in percentages (0 and 100), (25 and 75), (50 and 50), (75 and 25) and (100 and 0), are combined to form a dual additive. The desired additives were mixed with bitumen in 10% and 15%. Dynamic creep tests, modulus of erosion, moisture sensitivity and ITS have been used to evaluate asphalt mixture. In the numerical part, ANFIS neural network method has been used to estimate the results. The results showed that the addition of PET increased viscosity and also reduced density. The addition of PET to the additive (25% modifier) reduces the psychological number. On the other hand, the addition of 15 % modifier containing 0.75 CR increases the dynamic creep and reliesient moduls by about 52 %. Also, the addition of 15 % modifier containing 0.75 % PET increases the indirect tensile strength (Kpa) by about 14 % , to test the moisture sensitivity, a sample containing 10% rubber powder only improves about 11% of the moisture sensitivity of the mixture The ANFIS method is used to estimate the results of experimental test.

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