Pavement Performance Investigation of Nano-TiO2/CaCO3 and Basalt Fiber Composite Modified Asphalt Mixture under Freeze‒Thaw Cycles

Yafeng Gong,Guojin Tan,Zhenhong Tian,Haipeng Bi

doi:10.3390/app8122581

Abstract

The objective of this research is to evaluate the pavement performance degradation of nano-TiO2/CaCO3 and basalt fiber composite modified asphalt mixtures under freeze‒thaw cycles. The freeze‒thaw resistance of composite modified asphalt mixture was studied by measuring the mesoscopic void volume, stability, indirect tensile stiffness modulus, splitting strength, uniaxial compression static, and dynamic creep rate. The equal-pitch gray prediction model GM (1, 3) was also established to predict the pavement performance of the asphalt mixture. It was concluded that the high- and low-temperature performance and water stability of nano-TiO2/CaCO3 and basalt fiber composite modified asphalt mixture were better than those of an ordinary asphalt mixture before and after freeze‒thaw cycles. The test results of uniaxial compressive static and dynamic creep after freeze‒thaw cycles showed that the high-temperature stability of the nano-TiO2/CaCO3 and basalt fiber composite modified asphalt mixture after freeze‒thaw was obviously improved compared with an ordinary asphalt mixture.

Highlights

Due to the good performance and riding quality, along with easy maintenance and repair, asphalt pavement has increased year by year in China [1]
In order to improve the performance of asphalt pavement, reduce the damage of pavement, and extend the service life of pavement, nanomodification and fiber modification technologies have been applied in asphalt mixture
Nanomaterials have been gradually applied as asphalt mixture modifiers due to their special properties not found in macroscopic materials

Summary

Introduction

Due to the good performance and riding quality, along with easy maintenance and repair, asphalt pavement has increased year by year in China [1]. The temperature sensitivity of asphalt materials is high and the mechanical properties of asphalt pavement will degrade under large temperature difference [2]. Northeast China belongs to the seasonal frozen region and the average temperature in winter can reach −20 ◦ C and above 20 ◦ C in summer. In order to improve the performance of asphalt pavement, reduce the damage of pavement, and extend the service life of pavement, nanomodification and fiber modification technologies have been applied in asphalt mixture. Nanotechnology is a new technology that has gradually emerged in recent years. Nanomaterials have been gradually applied as asphalt mixture modifiers due to their special properties not found in macroscopic materials. Ameri et al evaluated moisture susceptibility of hot mix asphalt (HMA)

Objectives

Results

Conclusion