Genetic programming to formulate viscoelastic behavior of modified asphalt binder

Abstract

The objective of this research was to develop prediction models for complex shear modulus (G*) and phase angle (δ) of bitumens modified with crumb rubber, styrene-butadiene styrene, and polyphosphoric acid at low and moderate temperatures. The experiments consisted of three different dosages of each modifier added to the original bitumen followed by measurement of G* and δ of the original and modified bitumen using the dynamic shear rheometer (DSR) test in frequency sweep mode (21 loading frequencies from 0.1 to 100 Hz) at seven test temperatures: -22, -16, -10, 0, 10, 16 and 22°C. Having the experimental database, a robust genetic programming (GP) method was used to develop an individual prediction model for each modifier based on temperature, loading frequency, the G* and δ of the original bitumen, and the dosage of the modifier. Results showed that GP successfully developed accurate and meaningful expressions for calculating G* and δ of the modified bitumen as two main constitutive components of the viscoelastic behavior of bituminous composites. Then, a parametric study and sensitivity analysis were performed on the developed models to better understand the effect of variables on the trend of the models. The modifier dosage is the most effective input variable of the model and the amount of G* and δ of the original bitumen accurately reflect the effect of temperature and loading frequency on viscoelastic behavior of the modified bitumen, as they behave linearly at the considered test temperatures.

Developing Equations for Free Vibration Parameters of Bistable Composite Plates Using Multi-Objective Genetic Programming

“…It should be mentioned that bistable laminates do not have two stable shapes for ratios that are equal to or less than the critical ratio, and the natural frequency in this point is zero [20,35]. In addition to the parametric studies that shed more light on the trend of the inputs and the output parameters with relevant physical interpretations, to find the level of contribution of the inputs (i.e., a/b and t), the percentage of the sensitivity of each model is calculated using the following formula [57]:…”

Phương pháp tiếp cận trí tuệ nhân tạo để dự báo độ kim lún và điểm hóa mềm của nhựa đường biến tính graphen oxit

“…Biến tính nhựa đường gốc là một phương pháp phổ biến để cải thiện các tính chất lưu biến và cơ lý của nhựa đường nhằm đáp ứng các yêu cầu về tải trọng, lưu lượng, hạn chế hư hỏng và tăng tuổi thọ của mặt đường nhựa [1]. Để đạt được hiệu quả mong muốn, nhiều loại phụ gia được đưa vào nhựa đường như vụn cao su [2], chất thải nhựa [3], polime [4].…”

Evaluation of the influence of graphene oxide on asphalt binder physical and rheological properties

“…These limitations include temperature susceptibility, aging, and susceptibility to damage from moisture, which can compromise the long-term durability and functionality of the pavement. 4 Therefore, there is a growing need to investigate and develop innovative techniques to mitigate these shortcomings and improve the overall performance of AC pavements. A diverse range of methodologies and approaches has emerged to address these challenges, with asphalt modification being a key strategy and one of the most promising and effective solutions.…”