VEERARAGAVAN AMIRTHALINGAM - Academia.edu (original) (raw)

Uploads

Papers by VEERARAGAVAN AMIRTHALINGAM

Infrastructure Asset Management, 2019

Highway networks play a vital role in the nation’s economy. With the continuing increase in traff... more Highway networks play a vital role in the nation’s economy. With the continuing increase in traffic and road users’ expectations of comfort and safety, road authorities are increasingly interested in the upgrading and strengthening of pavements to enhance their service life. However, maintenance of road infrastructures is restricted by a limited budget. In such a situation, effective pavement maintenance scheduling is essential to maintain pavements at the desired level of quality. The performance of pavements is expressed in terms of matrices called transition probability matrices (TPMs). Likewise, pavement condition is expressed as a condition vector, which represents a particular distress (roughness and deflection). In the present study, TPMs for pavement distress and treatment effectiveness are derived from regression models. Pavement condition vectors are obtained from the condition probability distribution as a proportion of each state to which the distress level belongs. Afte...

International Journal of Pavement Research and Technology, 2019

Maintenance management of a large road network with limited resources is a challenging task in de... more Maintenance management of a large road network with limited resources is a challenging task in developing countries like India. Road agencies expect that the condition of their road infrastructure should always above the desired level of performance even under restricted resources. This requires an integrated decision support system considering all aspects of maintenance. In this paper, a framework for optimal maintenance decisions by multi-objective approach is formulated for a road network by considering functional condition of the pavement quantified in terms of roughness and structural condition quantified in terms of rebound deflection. A multiobjective optimization model is developed using Integer Linear Programming (ILP). A novel approach to track the age of pavement is applied in the formulation of the mathematical model. The ε-constraint method is adopted to generate non-dominated solutions. Budget bound optimizing model is formulated and implemented for a typical road network of four roads and optimal maintenance scheduling is arrived.

World Academy of Science, Engineering and Technology, International Journal of Transport and Vehicle Engineering, 2017

The service life and performance of pavements depend mainly on the quality of the materials used ... more The service life and performance of pavements depend mainly on the quality of the materials used for construction. Naturally available materials such as soil, stone aggregates, sand etc. and some of the processed materials like bitumen are conventionally used for road construction. But they are depleting fast and results in higher procurement and processing cost. Therefore, alternative materials such industrial wastes, chemical products are considered for road construction. If these materials can be suitably utilised in highway construction, the pollution and scarcity of aggregates problems may be partly reduced. In the present study, a soil stabilizer produced by the Stabilroad is investigated for its application in pavement layers. The Stabilroad stabilizer should be used along with cement which can be mixed with the existing soil. This makes the pavement layers to have good compressive strength as well as flexible and waterproof. The StabilRoad allows the agencies to stabilize di...

This paper presents an analysis of the level of safety on a multi-lane rural highway operating in... more This paper presents an analysis of the level of safety on a multi-lane rural highway operating in plain and rolling terrain and under heterogeneous traffic conditions by developing safety performance functions (SPFs). The study involves collection of data and information about the various elements contributing to crash occurrence like roadway characteristics, traffic conditions and environmental characteristics. Due to the random variation and rareness of crashes, Poisson regression and Negative binomial of count data modeling approach were used. Zero-Inflated models were also developed to verify the level of significance of the dependent variable (crash) with excess zeros. The study enabled better understanding of the influence of geometric design elements on road crashes under heterogeneous traffic conditions and provided insight on the significant effect of operating speed on curves and tangent sections along the highway, on the crashes. One of the major contributions of the pres...

Infrastructure Asset Management

Highway networks play a vital role in the nation’s economy. With the continuing increase in traff... more Highway networks play a vital role in the nation’s economy. With the continuing increase in traffic and road users’ expectations of comfort and safety, road authorities are increasingly interested ...

Geotextiles and Geomembranes

Abstract Reflective cracking is a major cause for premature deterioration of asphalt pavements. D... more Abstract Reflective cracking is a major cause for premature deterioration of asphalt pavements. Different varieties of geosynthetics are used at the interfaces of surface layers to control the reflective cracks. The significant factors influencing their efficiency are the flexural strength and interfacial bonding. Fracture energy that leads to development of cracks and their propagation can be investigated by single-edge notched beam (SENB) tests with sufficient accuracy. Double layered asphalt samples were extracted from pavement sections purposely built as part of this investigation for conducting quasi-static SENB tests. The goal of this paper is two-fold (a) to present a methodology for conducting SENB tests to measure the fracture properties of geosynthetic reinforced samples at temperatures of 10 °C, 20 °C and 30 °C and (b) evaluation of the flexural and the fracture characteristics of unreinforced and geosynthetic reinforced samples. The geosynthetic reinforcement did not show much improvement of the Asphalt Concrete (AC) in the pre-cracking phase but slowed down the crack propagation. The failure pattern of reinforced specimens has changed from quasi-brittle to ductile. An equation is proposed to predict the crack initiation force of SENB sample knowing the bond strength of the corresponding reinforced AC layers at their respective temperature.

AbstractThe paper presents the application of falling weight deflectometer (FWD) for the assessme... more AbstractThe paper presents the application of falling weight deflectometer (FWD) for the assessment of the structural capacity of a network of roads at district level by mechanistic-empirical techn...

Journal of Materials in Civil Engineering

Journal of Traffic and Transportation Engineering (English Edition)

SN Applied Sciences

Numerous studies have been conducted to identify moisture sensitive mixes during mix design by si... more Numerous studies have been conducted to identify moisture sensitive mixes during mix design by simulating various mechanisms of moisture damage. These methods involve the determination of changes in strength or stiffness of asphalt mixes due to moisture conditioning. The objective of this study is to understand the coupled problem of moisture induced material loss and change in strength/stiffness of the mix. Moisture Induced Stress Tester was used for conditioning samples of a poor and a good performing mixes. This test applies cyclic pressures in the asphalt mix samples through repeated pulses of water. The effluent containing aggregates and binder that were dislodged from the samples during the moisture conditioning process were collected for testing. Both coated and uncoated/fractured aggregates were found in the effluent. The results indicated that the samples with a higher loss of asphalt binder compared to other samples in the investigation during conditioning may exhibit higher tensile strengths, and those with a loss of finer materials, which is indicative of aggregate breakdown, show a lower tensile strength. Both seismic modulus and indirect tensile strength tests were found to be able to differentiate the poor and good performing mixes. For the mixes used in this study, the rate of change in indirect tensile strength during moisture conditioning was found to be strongly correlated to the pre-conditioning modulus of the mix, and a method is suggested for using the threshold values of properties of pre-conditioning mixes for different durations of moisture conditioning during mix design to screen poor mixes in a fast and nondestructive manner. Keywords HMA • Seismic modulus • Indirect tensile strength • Dissolved organic carbon • Moisture induced stress tester • Moisture damage • Loss of aggregates • Loss of asphalt binder * Uma Maheswar Arepalli,

Transportation Research Procedia, 2016

Infrastructure Asset Management, 2019

Highway networks play a vital role in the nation’s economy. With the continuing increase in traff... more Highway networks play a vital role in the nation’s economy. With the continuing increase in traffic and road users’ expectations of comfort and safety, road authorities are increasingly interested in the upgrading and strengthening of pavements to enhance their service life. However, maintenance of road infrastructures is restricted by a limited budget. In such a situation, effective pavement maintenance scheduling is essential to maintain pavements at the desired level of quality. The performance of pavements is expressed in terms of matrices called transition probability matrices (TPMs). Likewise, pavement condition is expressed as a condition vector, which represents a particular distress (roughness and deflection). In the present study, TPMs for pavement distress and treatment effectiveness are derived from regression models. Pavement condition vectors are obtained from the condition probability distribution as a proportion of each state to which the distress level belongs. Afte...

International Journal of Pavement Research and Technology, 2019

Maintenance management of a large road network with limited resources is a challenging task in de... more Maintenance management of a large road network with limited resources is a challenging task in developing countries like India. Road agencies expect that the condition of their road infrastructure should always above the desired level of performance even under restricted resources. This requires an integrated decision support system considering all aspects of maintenance. In this paper, a framework for optimal maintenance decisions by multi-objective approach is formulated for a road network by considering functional condition of the pavement quantified in terms of roughness and structural condition quantified in terms of rebound deflection. A multiobjective optimization model is developed using Integer Linear Programming (ILP). A novel approach to track the age of pavement is applied in the formulation of the mathematical model. The ε-constraint method is adopted to generate non-dominated solutions. Budget bound optimizing model is formulated and implemented for a typical road network of four roads and optimal maintenance scheduling is arrived.

World Academy of Science, Engineering and Technology, International Journal of Transport and Vehicle Engineering, 2017

The service life and performance of pavements depend mainly on the quality of the materials used ... more The service life and performance of pavements depend mainly on the quality of the materials used for construction. Naturally available materials such as soil, stone aggregates, sand etc. and some of the processed materials like bitumen are conventionally used for road construction. But they are depleting fast and results in higher procurement and processing cost. Therefore, alternative materials such industrial wastes, chemical products are considered for road construction. If these materials can be suitably utilised in highway construction, the pollution and scarcity of aggregates problems may be partly reduced. In the present study, a soil stabilizer produced by the Stabilroad is investigated for its application in pavement layers. The Stabilroad stabilizer should be used along with cement which can be mixed with the existing soil. This makes the pavement layers to have good compressive strength as well as flexible and waterproof. The StabilRoad allows the agencies to stabilize di...

This paper presents an analysis of the level of safety on a multi-lane rural highway operating in... more This paper presents an analysis of the level of safety on a multi-lane rural highway operating in plain and rolling terrain and under heterogeneous traffic conditions by developing safety performance functions (SPFs). The study involves collection of data and information about the various elements contributing to crash occurrence like roadway characteristics, traffic conditions and environmental characteristics. Due to the random variation and rareness of crashes, Poisson regression and Negative binomial of count data modeling approach were used. Zero-Inflated models were also developed to verify the level of significance of the dependent variable (crash) with excess zeros. The study enabled better understanding of the influence of geometric design elements on road crashes under heterogeneous traffic conditions and provided insight on the significant effect of operating speed on curves and tangent sections along the highway, on the crashes. One of the major contributions of the pres...

Infrastructure Asset Management

Highway networks play a vital role in the nation’s economy. With the continuing increase in traff... more Highway networks play a vital role in the nation’s economy. With the continuing increase in traffic and road users’ expectations of comfort and safety, road authorities are increasingly interested ...

Geotextiles and Geomembranes

Abstract Reflective cracking is a major cause for premature deterioration of asphalt pavements. D... more Abstract Reflective cracking is a major cause for premature deterioration of asphalt pavements. Different varieties of geosynthetics are used at the interfaces of surface layers to control the reflective cracks. The significant factors influencing their efficiency are the flexural strength and interfacial bonding. Fracture energy that leads to development of cracks and their propagation can be investigated by single-edge notched beam (SENB) tests with sufficient accuracy. Double layered asphalt samples were extracted from pavement sections purposely built as part of this investigation for conducting quasi-static SENB tests. The goal of this paper is two-fold (a) to present a methodology for conducting SENB tests to measure the fracture properties of geosynthetic reinforced samples at temperatures of 10 °C, 20 °C and 30 °C and (b) evaluation of the flexural and the fracture characteristics of unreinforced and geosynthetic reinforced samples. The geosynthetic reinforcement did not show much improvement of the Asphalt Concrete (AC) in the pre-cracking phase but slowed down the crack propagation. The failure pattern of reinforced specimens has changed from quasi-brittle to ductile. An equation is proposed to predict the crack initiation force of SENB sample knowing the bond strength of the corresponding reinforced AC layers at their respective temperature.

AbstractThe paper presents the application of falling weight deflectometer (FWD) for the assessme... more AbstractThe paper presents the application of falling weight deflectometer (FWD) for the assessment of the structural capacity of a network of roads at district level by mechanistic-empirical techn...

Journal of Materials in Civil Engineering

Journal of Traffic and Transportation Engineering (English Edition)

SN Applied Sciences

Numerous studies have been conducted to identify moisture sensitive mixes during mix design by si... more Numerous studies have been conducted to identify moisture sensitive mixes during mix design by simulating various mechanisms of moisture damage. These methods involve the determination of changes in strength or stiffness of asphalt mixes due to moisture conditioning. The objective of this study is to understand the coupled problem of moisture induced material loss and change in strength/stiffness of the mix. Moisture Induced Stress Tester was used for conditioning samples of a poor and a good performing mixes. This test applies cyclic pressures in the asphalt mix samples through repeated pulses of water. The effluent containing aggregates and binder that were dislodged from the samples during the moisture conditioning process were collected for testing. Both coated and uncoated/fractured aggregates were found in the effluent. The results indicated that the samples with a higher loss of asphalt binder compared to other samples in the investigation during conditioning may exhibit higher tensile strengths, and those with a loss of finer materials, which is indicative of aggregate breakdown, show a lower tensile strength. Both seismic modulus and indirect tensile strength tests were found to be able to differentiate the poor and good performing mixes. For the mixes used in this study, the rate of change in indirect tensile strength during moisture conditioning was found to be strongly correlated to the pre-conditioning modulus of the mix, and a method is suggested for using the threshold values of properties of pre-conditioning mixes for different durations of moisture conditioning during mix design to screen poor mixes in a fast and nondestructive manner. Keywords HMA • Seismic modulus • Indirect tensile strength • Dissolved organic carbon • Moisture induced stress tester • Moisture damage • Loss of aggregates • Loss of asphalt binder * Uma Maheswar Arepalli,

Transportation Research Procedia, 2016