Further Investigation on Damage Model of Eco-Friendly Basalt Fiber Modified Asphalt Mixture under Freeze-Thaw Cycles

Abstract

The main distresses of asphalt pavements in seasonally frozen regions are due to the effects of water action, freeze-thaw cycles, and so on. Basalt fiber, as an eco-friendly mineral fiber with high mechanical performance, has been adopted to reinforce asphalt mixture in order to improve its mechanical properties. This study investigated the freeze-thaw damage characteristics of asphalt mixtures reinforced with eco-friendly basalt fiber by volume and mechanical properties—air voids, splitting tensile strength, and indirect tensile stiffness modulus tests. Test results indicated that asphalt mixtures reinforced with eco-friendly basalt fiber had better mechanical properties (i.e., splitting tensile strength and indirect tensile stiffness modulus) before and after freeze-thaw cycles. Furthermore, this study developed logistic damage models of asphalt mixtures in terms of the damage characteristics, and found that adding basalt fiber could significantly reduce the damage degree by about 25%, and slow down the damage grow rate by about 45% compared with control group without basalt fiber. Moreover, multi-variable grey models (GM) (1,N) were established for modelling the damage characteristics of asphalt mixtures under the effect of freeze-thaw cycles. GM (1,3) was proven as an effective prediction model to perform better in prediction accuracy compared to GM (1,2).

Laboratory Evaluation on the Performance of Porous Asphalt Mixture with Steel Slag for Seasonal Frozen Regions

“…For the F-T splitting test, specimens were kept in water at 97.3 to 98.7 kPa (730-740 mmHg) for 15 min, and then immersed into water at atmospheric pressure for 30 min. Subsequently, specimens were frozen at −18 • C in air for 16 h, and then thawed in water at 60 • C for 24 h. The F-T cycles splitting test was the repeated F-T splitting test, which can be seen elsewhere [46]. The difference is that for the F-T cycles splitting test, specimens were thawed at 60 • C for 6 h. A detailed description of the F-T splitting test and F-T cycles splitting test was provided in our previous studies [40,46].…”

“…Subsequently, specimens were frozen at −18 • C in air for 16 h, and then thawed in water at 60 • C for 24 h. The F-T cycles splitting test was the repeated F-T splitting test, which can be seen elsewhere [46]. The difference is that for the F-T cycles splitting test, specimens were thawed at 60 • C for 6 h. A detailed description of the F-T splitting test and F-T cycles splitting test was provided in our previous studies [40,46]. The tensile strength ratio after one F-T cycle (TSR-1) was defined as the ratio between ITS of the specimen subjected to one F-T cycle and ITS of the fresh specimen, and the tensile strength ratio after 15 F-T cycles (TSR-15) as the ratio between ITS of the specimen subjected to 15 F-T cycles and ITS of the fresh specimen.…”

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

“…This ensures stabilization of the process of obtaining basalt fiber, which is more effective than basalt melts of another warehouse, in which the zone of optimal values is within 25-40 minutes. At a broaching speed of 25...38.5 m/min of basalt fiber through the spin plate and a cooling rate in the range of 1840...1960 °C/min, fixation of the vitreous state of the fiber material with the formation of active zones on its surface [15,16] (Fig. 5, 6).…”

Master Curve Establishment and Complex Modulus Evaluation of SBS-Modified Asphalt Mixture Reinforced with Basalt Fiber Based on Generalized Sigmoidal Model

“…Cheng et al [33] made an overall assessment of the mechanical performances of asphalt materials incorporating of basalt fiber and analyzed the improvement impact of F-T resistance based on volumetric and mechanical parameters. Furthermore, they analyzed logistic F-T damage models of asphalt mixtures and established a multi-variable grey model [34]. Cheng et al [35] established a damage evolution of the mechanical performance of asphalt mixtures exposed to repeated F-T actions through reliability and damage theory, and predicted and analyzed its internal damage degradation.…”