Modeling the international roughness index performance on semi-rigid pavements in single carriageway roads

Studies on the validity of strain sensors for pavement monitoring: A case study for a fiber Bragg grating sensor and resistive sensor

Understanding the structural behavior of layered asphalt pavements subjected to dynamic moving wheel loads is a crucial requirement for the future design of more-durable pavement structures...

Finite-Element Simulation of Instrumented Asphalt Pavement Response under Moving Vehicular Load

Mechanical response of hydronic asphalt pavement under temperature–vehicle coupled load: A finite element simulation and accelerated pavement testing study

Fractional derivative viscoelastic response of high-viscosity modified asphalt

Numerical investigation of the mechanical response of semi-rigid base asphalt pavement under traffic load and nonlinear temperature gradient effect

Falling weight deflectometer (FWD) is the most widely used nondestructive testing method for pavement structure. The back-calculation of structural modulus based on the deflection basin is an important approach to evaluate the service state of pavement structure and study the evolution law of its behavior. Although the deflection of pavement can be approximated as elastic deformation by the instantaneous impact load in FWD testing, the nonlinear response characteristics of structure and materials are non-negligible, which brings difficulties to the modulus back-calculation for a multilayer system. This paper proposes a new back-calculation method of the four-layer structure, which is based on the linear elastic layered mechanical system, through analyzing the empirical relationship between the geometric characteristics of the measured deflection basin and the corresponding moduli of the structural layers. In addition, the feasibility and reliability of this method are evaluated by using the FWD data of the representative structures in the RIOHTrack test road. 

Modulus Back-Calculation of Four-Layer System Based on the Characteristic Parameters of Deflection Basin

Road material constitutive model is the essential condition of pavement structure design, calculation, and maintenance decision. Experts have conducted in-depth studies on the problems and proposed many meaningful constitutive models. However, these constitutive models have not been summarized and no uniform conclusion on the applicability of them is reported in the academic circle. The linear elastic model based on Hooke's law is still used in pavement structure design. This paper systematically reviewed the existing constitutive models that reflect the materials' mechanical properties and used for pavement structure calculation. These constitutive models were divided into three categories: linear, nonlinear, and damage models under repeated loads. The applicable conditions, parameter determination methods, advantages, and disadvantages of each model were introduced. Moreover, the model's feasibility in structural design and calculation was analyzed. Follow-up studies should focus on the parameter determination standard of viscoelastic constitutive models, the extension of the 1D constitutive model to 3D state, and the nonlinear constitutive models related to stress-strain state to drive the application of the constitutive models in pavement structure calculation and design. Furthermore, to evaluate the life cycle service performance of road materials and structures, establishing the pavement damage model from the structure perspective will be the future direction. 

Review on constitutive models of road materials

In order to evaluate the feasibility of using hard-grade asphalt concrete in China’s highway construction, based on the accelerated loading test of the full-scale track of the Research Institute of Highway Ministry of Transport (RIOHTrack), the long-term service performance of hard-grade asphalt concrete base pavement was studied, and its actual service effect was evaluated. The study found that hard-grade asphalt concrete has higher strength, modulus and high-temperature stability. Although the low-temperature performance is generally not as good as that of asphalt, with a penetration grade (PG) of 60/80, it has equivalent or better cracking resistance in the area where the RIOHTrack is located. During the five-year observation period, the rutting deformation of the pavement structure showed an annual fluctuation increase. In comparison, the rutting resistance of a hard-grade asphalt concrete base structure can be increased by approximately 16%, and the deflection value is smaller, so the long-term performance of the anti-rutting effect and structural bearing capacity are better. The study shows that hard-grade asphalt concrete base pavement is suitable for highway construction in parts of China, where the climate is similar to that of the RIOHTrack location, or the temperature is higher or the latitude is lower.

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Long-Term Service Performance of Hard-Grade Asphalt Concrete Base Pavement Based on Accelerated Loading Test of Full-Scale Structure

The evaluation of asphalt pavement structures has been a critical challenge in the field due to the practical limitations in methodology. In this paper, we propose a data-driven framework to evaluate structural performance of nineteen widely used asphalt structures in the Research Institute of Highway Ministry of Transport track (RIOHTrack). Specifically, we utilize the unsupervised machine learning method to delineate the similar and disparate performance among tested structures based on four years of falling weight deflectometer (FWD) experiments. Next, the structural performance is investigated on the temporal scale and the dynamic performance variations are captured over the course of the testing. Finally, experimental results are discussed and we provide essential evidence to aid future asphalt pavement design and construction.

https://www.aimsciences.org/article/exportPdf?id=77e71671-3a8b-4c27-8ed6-06c2379589bb

Xingye Zhou

Papers

Numerical investigation of the mechanical response of semi-rigid base asphalt pavement under traffic load and nonlinear temperature gradient effect

Modulus Back-Calculation of Four-Layer System Based on the Characteristic Parameters of Deflection Basin

Review on constitutive models of road materials

Long-Term Service Performance of Hard-Grade Asphalt Concrete Base Pavement Based on Accelerated Loading Test of Full-Scale Structure

A data-driven approach to the evaluation of asphalt pavement structures using falling weight deflectometer