Research on Fatigue Model of Semi‐Rigid Base Asphalt Pavement before and after Polymer Grouting

Abstract

To improve the service life of a semirigid base asphalt pavement and prolong its service cycle, it is imperative to conduct long-term performance research before and after pavement disease repair. This study proposes a fatigue damage model for pavement and polymer materials and uses the finite element method to establish a three-dimensional numerical model of a semirigid base asphalt pavement structure. Moreover, it compares and analyzes the mechanical response and fatigue damage of this pavement before and after polymer repair. The evolution law is verified by indoor fatigue tests. The results show that, under a standard load of 0.7 MPa, the vertical displacement and the Mises stress of the vacant position after the polymer repair are reduced by 61% and 69%, respectively. Under a cyclic load of 1.2 MPa, the number of load actions increases from 500,000 to more than 5 million, and the fatigue damage factor of the polymer is reduced by 29%. With the increase in the number of fatigue test loads, the cumulative evolution trend of the fatigue damage is basically consistent with the results of the numerical simulation, which verifies the rationality of the numerical model. This research is relevant for providing a reference for extending the service life of expressways and improving the technical level of expressway maintenance.

Preparation and Performance of Water-Active Polyurethane Grouting Material in Engineering: A Review

“…The elastic modulus of polyurethane foam samples fluctuated near the initial value with an increase in the soaking time and did not significantly change with soaking time. A few scholars [ 80 , 81 , 82 , 83 ] studied the physical properties of polyurethane foam materials in frozen soil environments and found that the water absorption increased with the increase in soaking time. Figure 5 summarizes the change in the moisture absorption rate of foam materials with soaking time.…”

Research on Laboratory Testing Method of Fatigue Performance of Semi-Rigid Base Considering Spatial Stress State

“…Therefore, enhancing the fatigue performance of semi-rigid base layers using advanced technology holds significant practical importance [9,10]. The researchers have investigated the effects of structure design [11,12], aggregate types [13,14], cement properties [15][16][17][18], and aggregate properties [10,[19][20][21] on the fatigue performance of semi-rigid base layers. The idea that adding reinforcement materials in semi-rigid base layers draws inspiration from the concept of adding reinforcements in bridge structures to improve their flexural tensile performance [22,23].…”

Multiple Reflective Cracks in Semirigid Base Asphalt Pavement under Traffic Load Using XFEM

“…e main disadvantage of cementstabilized macadam in semirigid base asphalt pavements is fatigue cracking under traffic loads over time [13]. Zhang et al [14] compared the mechanical response and fatigue damage of semirigid base asphalt pavement structure before and after repairing reflective cracks with polymer by finite element method. Wang and Ma [15] developed an interlayer contact bonding model to simulate the local bonding state between adjacent layers, and using the established semirigid base asphalt pavement structural model, the effect of temperature on the separation area between the asphalt concrete layer and the base was calculated and analyzed.…”