Fatigue Destruction of Asphalt Concrete Pavement: Self- Organization and Mechanical Interpretation

This chapter analyzes the fatigue failure of the asphalt concrete pavement of the highway on a macroscopic level. Based on the actual data, obtained on the sections of the real highways, the principle was formulated for the staged fatigue failure of the asphalt concrete pavement. During the analysis of the existing classifications of the fatigue cracks, it was determined that in Kazakhstan, the stage behavior of the fatigue cracks was not considered, and in the USA, the relation between stages of failure was not established. Similarly to the known phenomena of self-organization in thermodynamics of irreversible processes and dynamics of nonlinear systems (synergetics)—Benar’s effects and division of biological cell, it was proposed to consider the parts of the asphalt concrete pavement as the specific dissipative structures, occurring in critical conditions, and a new regularity of fatigue failure was formulated. The formulated regularity of the staged fatigue failure of the asphalt concrete pavement was explained based on the new proposed scheme of bifurcation with the use of the results of experimental determination of the occasional, cyclic, long-term and residual strength

Temperature and moisture distribution in a highway in south-eastern Kazakhstan

The matters of investigation for water thermal regime of pavement and subgrade structures of the highways are especially important as the moisture and temperature distribution in pavement and subgrade layers impact greatly on their deformation and strength indicators. Experimental results, which can be obtained by special measurement devices, are primary ones for establishing of peculiarities and regularities for distribution and migration of heat and moisture in the mentioned structural elements of the highways. Special measurement devices are required to obtain such experimental data. The paper shows the results for analysis of temperature and moisture variation in points of pavement and subgrade of “Almaty-Bishkek” highway. Temperature measurement has been performed by set of special sensors. Regular temperature and moisture measurement have been performed for the period from September 18, 2015 to June 2, 2016. Regularities for temperature regime variation in points of pavement for 24 hours are coordinated with air temperature variations. Amplitude of vibration for temperature is decreased with the depth increase. Moisture in subgrade points is gradually decreased with the reduction of daily average air temperature

Analysis of pavement condition survey data for effective implementation of a network level pavement management program for Kazakhstan

Pavement roads and transportation systems are crucial assets for promoting political stability, as well as economic and sustainable growth in developing countries. However, pavement maintenance backlogs and the high capital costs of road rehabilitation require the use of pavement evaluation tools to assure the best value of the investment. This research presents a methodology for analyzing the collected pavement data for the implementation of a network level pavement management program in Kazakhstan. This methodology, which could also be suitable in other developing countries’ road networks, focuses on the survey data processing to determine cost-effective maintenance treatments for each road section. The proposed methodology aims to support a decision-making process for the application of a strategic level business planning analysis, by extracting information from the survey data

Determination of the Creep Parameters of Linear Viscoelastic Materials

Creep process of linear viscoelastic materials is described by the integral equation of Boltzmann-Volterra in which creep kernel is approximated by Rabotnov’s fractional exponential function. The creep equation contains four unknown parameters: α, singularity parameter; β, fading parameter; λ, rheological parameter; and ε0, conditionally instantaneous strain. Two-stage determination method of creep parameters is offered. At the first stage, taking into account weak singularity properties of Abel’s function at the initial moment of loading, parameters ε0 and α are determined. At the second stage, using already known parameters ε0 and α, parameters β and λ are determined. Analytical expressions for calculating these parameters are obtained. An accuracy evaluation of the offered method with using experimentally determined creep strains of material Nylon 6 and asphalt concrete showed its high accuracy

Mathematical Model to Predict the Affinity Between Aggregate/Bitumen

The stones used for the construction of road surfaces have a complex mineralogical and hence chemical composition. They are made up of several types of minerals put together. This generates a significant difference in adhesion with the bituminous binder. The aim of this study is to create a mathematical model able to predict the adhesion between bitumen and stone on the basis of contact angle measurements made on different pure minerals. The mathematical model used was developed keeping in mind the exponential bond that the minerals have with the corresponding bond angle. This model also confirmed the established fact that the lower the value of Δ, the better the adhesion between the bitumen and the aggregate

Unsteady-State Creep of an Asphalt Concrete

At present, an asphalt concrete, it seems, is the most widespread road material all over the world [...

Temperature and moisture distribution in a highway in south-eastern Kazakhstan

The matters of investigation for water thermal regime of pavement and subgrade structures of the highways are especially important as the moisture and temperature distribution in pavement and subgrade layers impact greatly on their deformation and strength indicators. Experimental results, which can be obtained by special measurement devices, are primary ones for establishing of peculiarities and regularities for distribution and migration of heat and moisture in the mentioned structural elements of the highways. Special measurement devices are required to obtain such experimental data. The paper shows the results for analysis of temperature and moisture variation in points of pavement and subgrade of “Almaty-Bishkek” highway. Temperature measurement has been performed by set of special sensors. Regular temperature and moisture measurement have been performed for the period from September 18, 2015 to June 2, 2016. Regularities for temperature regime variation in points of pavement for 24 hours are coordinated with air temperature variations. Amplitude of vibration for temperature is decreased with the depth increase. Moisture in subgrade points is gradually decreased with the reduction of daily average air temperature

Multi-criteria choice of the region for the construction of a logistics center based on AHP: case study for Kazakhstan

The current state of the regional market of transport and logistics services in Kazakhstan is characterized by a disparity between the increasing demand for Logistics services and the lack of logistics capacity. In this article, the authors propose a method for determining the most promising areas of the Republic of Kazakhstan for the construction of a logistics center, based on the Analytic Hierarchy Process (AHP)

ABOUT STRESSED DEFORMED CONDITION OF FLEXIBLE PAVEMENT WITH CRACK

Paper shows the results for construction of mathematical model for multilayer pavement structure, in one layer of which the single vertical crack is initiated. During problem solving for mechanics of solid deformed body, to which the problem of stressed deformed condition of multilayer pavement relates, one can use program complex ANSYS, which showed itself to good advantage in world practice, where finite element method is used. However, the availability of cracks of various length and spatial orientation makes the use of ANSYS not very efficient, as at variations of geometrical parameters for cracks, it is required to introduce changes into leading program, which is not very convenient to make in the program on ANSYS, as many operations have been performed secretly from the researcher. Based on the above JSC “KazdorNII” has developed the calculation program BASIC_MKE in terms of MATLAB. As the singularity is available in crack points, calculations should be made with high accuracy, for that reason quadratic elements with eight nodes have been used in the developed program. To imitate the availability of a single crack the imaginary void is introduced into calculation scheme with initial zero area, which allows considering of adhesion conditions between asphalt concrete layer with crack and underlying gravel layer. For approbation of the created calculation program, the formulated problem is solved in parallel in program complex ANSYS, and components of tensor deformation, obtained by two programs, are compared among themselves. Comparison of the results for problem solution according to program BASIC_MKE with the results of solution of the same problem according to program in ANSYS shows that the developed calculation program in terms of MATLAB is functionally operative