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

Abstract

The objective of this research is to evaluate the pavement performance degradation of nano-TiO 2 /CaCO 3 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-TiO 2 /CaCO 3 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-TiO 2 /CaCO 3 and basalt fiber composite modified asphalt mixture after freeze-thaw was obviously improved compared with an ordinary asphalt mixture. adhesion between the asphalt binder and sensitive aggregate against moisture damage [4]. Nano-TiO 2 is a commonly used nanomodified material. Shafabakhsh et al. found that nano-TiO 2 could effectively improve the viscosity, anti-rutting, and anti-fatigue properties of asphalt mixture [5]. Sadeghnejad et al. used nanomaterials to modify SMA and the test results showed that nano-TiO 2 could improve the anti-rutting ability and splitting strength ratio and prolong the service life of an asphalt mixture [6]. Nazari et al. evaluated the microstructure and chemical properties of nanocomposite modified asphalt by X-ray and scanning electron microscopy. It was found that the addition of nanomaterials improved the fatigue resistance of asphalt mixture [7].There are many kinds of fiber modifiers used in asphalt mixtures in recent years, such as polyester fiber, lignin fiber, carbon fiber, glass fiber, basalt fiber, etc. Different fiber modifiers have their own advantages and disadvantages. The low-temperature crack resistance of asphalt mixture is the main problem in the frozen region of northeast China. Compared with other fibers, basalt fiber is a mineral fiber that is abundant and easy to obtain in northeast China. Also, it will not cause environmental pollution. Basalt fiber has some advantages in terms of modifying road performance of asphalt mixtures. Zheng studied the pavement performances of basalt fiber, lignin fiber, and polyester fiber modified asphalt mixtures and found that the performance of the basalt fiber modified asphalt mixture was superior to that of the others [8,9]. Morova et al. studied the usability of basalt fibers in order to bear the stresses occurring at the surface layer of pavement and the optimum value of the fiber ratio leading to the optimum stability value was determined [10]. Chen found that basalt fiber, at the optimal fiber content, could improve the water stability and high-temperature stability of the asphalt mi...

Experimental Characterization of Viscoelastic Behaviors of Nano-TiO2/CaCO3 Modified Asphalt and Asphalt Mixture

“…The nano-TiO 2 /CaCO 3 was developed and provided by the college of chemistry, Jilin University [ 41 ]. Its detailed technical characteristics are presented in Table 2 .…”

“…Prior studies that have noted the reasonable dosage of nano-TiO 2 /CaCO 3 is 5% in weight of bitumen [ 41 ]. During the preparatory stage of nano-TiO 2 /CaCO 3 modified bitumen, original bituminous material was preheated to 160 °C and next it was blended with modified nano-TiO 2 /CaCO 3 by manually stirring for 5 min.…”

The Influence of Technological Factors on the Properties of Basalt Fiber When Used in the Manufacture of Flexible Heat and Sound Insulating Products

“…At the third stage of research, the interaction of basalt fiber with etching solutions is studied in order to adjust the chemical composition in the direction of obtaining the maximum content of silica, aluminum, and titanium. The choice of an acid solution and the establishment of optimal values of their characteristics is based on an analysis of the properties of the constituent parts of the basalt fiber material [18]. The concentration of the etching solution is 3.25 and the temperature of the solution is 50 °C, the exposure time is 60-65 minutes.…”

Fractal Analysis of the Fracture Evolution of Freeze-Thaw Damage to Asphalt Concrete

“…The results indicated that the multi-axial strength decayed significantly after 20 freeze-thaw cycles [17]. Wang et al conducted a freeze-thaw split to evaluate the flexural resistance damage caused by freeze-thaw cycles [6,15,18,19,20].…”