Satish Pandey

CSIR-Central Road Research Institute, New-Delhi, India, Flexible Pavement, Faculty Member

AcSIR,INDIA, Transporatation Engg., Faculty Member

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Phone: +91 9999366937
Address: Flexible Pavement Div.
CSIR- Central Road Research Institute, New-Delhi, India

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Karlsruhe Institute of Technology (KIT)

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Ritu rani

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Papers by Satish Pandey

EFFECT OF HIGHER AXLE LOADS ON SERVICE LIFE OF BITUMINOUS PAVEMENT

This paper evaluates the effect of higher axle load on service life of bituminous pavement in ter... more This paper evaluates the effect of higher axle load on service life of bituminous pavement in terms of propensity of fatigue and rutting damage in bituminous pavement. The three-dimensional finite element model of bituminous pavement was developed using ANSYS Mechanical APDL finite element software. FEM model was validated by comparing the surface deflection obtained through pavement analysis design program KENPAVE. Validated model was subjected to dynamic loading condition to obtain the pavement response under real time truck loading at varying axle loads. Critical strains attributing fatigue and rutting damage in pavement i.e. the horizontal tensile strains at the bottom of bituminous layer and vertical compressive strains at the top of sub-grade were calculated at most damaging vehicle speed. These values are incorporated in the fatigue and rutting models developed by Asphalt Institute to evaluate the service life of bituminous pavement. Effect of vehicle speed on fatigue and rutting strain in bituminous pavement were assessed through finite element model. Impact of higher axle load on service life of the pavement is quantified to frame up the policy to penalize heavy vehicle in respect to magnitude of damage caused by them in the pavement.

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Utilization of Geosynthetic Reinforcement for Construction and Rehabilitation of Bituminous Pavement

by Satish Pandey, Guru Vittal, and Sunil Jain

The advent of geosynthetics has dramatically transformed the practice of geotechnical engineering... more The advent of geosynthetics has dramatically transformed the practice of geotechnical engineering around the world. Boom in road infrastructure development in our country has led to enhanced demand for cost effective new construction materials like geosynthetics. During last decade geosynthetic materials has been used in numerous ways as reinforcement in road infrastructure. This paper discuss the potential application
of geosynthetic materials specially geogrid and geotextile form the perspective of reinforcement in bituminous pavement and associated road infrastructure. Expected benefits in terms of improvement in service life, reduction in overall thickness and ease of construction in difficult areas are discussed in detail. Utilization of geosynthetic materials for subgrade stabilization, as base reinforcement and overlay reinforcement with stress absorbing interlayer are discussed in detail. This paper also presents few case studies, involving pioneering use of geosynthetic materials enumerating design and construction approach with their success stories.

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Fourier Transform Infrared Spectroscopy: A Tool for Detection of Lime Content in Hot Mix Asphalt

Fourier transform infrared spectroscopy (FTIR) is a rapid and sensitive analytical technique, to ... more Fourier transform infrared spectroscopy (FTIR) is a rapid and sensitive analytical technique, to identify a substance, in a mixture of compounds, if a former has singular and characteristic absorption bands at well-defined wavelengths. This paper contains a simple and rapid method based on Infrared absorption spectroscopy to make qualitative identification and quantitative prediction of lime in Hot Mix Asphalt (HMA). The mineralogical composition of hydrated lime was determined by Thermo Gravimetric Analysis (TGA). The TGA analysis revealed that, Portlandite [Ca(OH)2] and Calcite (CaCO3) has constituted around 97% part of the Hydrated Lime, commonly used in the hot mix asphalt in India. FTIR spectra of hydrated lime shows weak absorption peak between 3608 cm-1 to 3630 cm-1 wave number and sharp absorption peaks between 1399 cm-1 to 1406 cm-1 and at 873 cm-1 wave number. The first absorption peak i.e. at 3630 cm-1 wave number is due to the presence of hydroxyl group, Portlandite Ca(OH)2 in Calcium hydroxide, while the absorption peaks found between 1399 cm-1 to 1406 cm-1 and 873 cm-1 wave numbers are due to the presence calcium carbonate (calcite). Height of characteristics peaks of hydrated lime in IR spectra of recovered filler, from hot mix asphalt increases and decreases linearly as the concentration of hydrated lime varies. A method has been developed based on Lambert–Beer law1 with the help of quant software, by plotting a calibration graph between the height of the absorption peak and the concentration of hydrated lime for quantitative assessment of hydrated lime. In order to check the developed method, retrieve fillers from Marshall Specimens (containing known quantity of hydrated lime) were analyzed. Hydrated lime in recovered filler were detected, quantitatively within 3% relative mean error and less than 3.5% RSD for measurement on different KBr pellets.

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MECHANICAL PERFORMANCE OF BITUMINOUS CONCRETE INCORPORATING STEEL SLAG WITH NATURAL AGGREGATE

India has world's second largest road network in terms of length with a total road length of 4.24... more India has world's second largest road network in terms of length with a total road length of 4.24 million km. Hot mix bituminous pavement contributes around 50% road length to this vast road network. Large scale highway construction in India, emanating from rapid development, has caused massive depletion of scarce natural aggregate. This paper addresses this problem by investigating the influences of the utilization of steel slag as a coarse aggregate on the properties of hot mix bituminous concrete. Physical characteristics of bituminous mix ingredients i.e natural aggregate, steel slag aggregate and bituminous binder were determined to find out their compliance with Ministry of Road Transport and Highway Specification for Road and Bridge Works in India. Mechanical characteristics of bituminous mixes i.e Unmodified (having natural aggregate) and Modified (having steel slag as coarse aggregate) were determined using Marshall Method of mix design.

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MICRO-SURFACING: AN ECO-FRIENDLY BAILOUT FOR INDIAN ROADS

A well designed, developed and maintained highway system plays a vital role in socio-economic dev... more A well designed, developed and maintained highway system plays a vital role in socio-economic development of any country. A well maintained highway network is credited for bringing about improvements in access to goods and services, education and employment opportunities. It has been very well accepted worldwide that preventive maintenance of existing roadways is most effective use of available financial resources. Recent developments in cold mix technology in the area of cost effective preventive maintenance treatment have resulted durable pavements. Asphalt emulsion based micro surfacing is such a cost effective and environment friendly, preventive maintenance technology. Microsurfacing was developed in Germany and now commonly used for road maintenance in numerous countries. In Dec. 2008 Indian Road Congress has published "IRC: SP: 81; Tentative Specification for Slurry Seal and Microsurfacing" to standardized this technology for wider application in the country. Microsurfacing act as a sealant over the pavement surfaces. It prohibits the entrance of water from the surface course to base course and prolong the service life of the bituminous pavement by 3 to 4 years. Besides acting as sealant it helps to maintain good riding quality for vehicular traffic.

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EFFECT OF GEOGRID REINFORCEMENT ON CRITICAL RESPONSES OF BITUMINOUS PAVEMENTS

A series of finite element (FE) simulations are carried out to evaluate the benefits of integrati... more A series of finite element (FE) simulations are carried out to evaluate the benefits of integrating a high modulus geogrid as reinforcement into the pavement layers. This paper presents a two dimensional axisymmetric finite element model that analyzes the behavior of unreinforced and geogrid reinforced bituminous pavement subjected to static and dynamic loading conditions. The critical pavement responses such as fatigue (horizontal) strain, rutting (vertical) strain and vertical surface deflection are calculated for unreinforced and geogrid reinforced flexible pavement using a pavement response model developed through a commercially available finite element program PLAXIS. Parametric studies are performed by varying the location of geogrid reinforcement i.e. base -bituminous concrete interface and the base sub-grade interface. The structural benefits of geogrid reinforcement over fatigue and rutting strain criteria have been quantified. The results obtained are qualitatively compared with the results of published literature and fairly good agreement is found in fatigue and rutting strains in the reinforced pavement. It has been found that placing geogrid reinforcement at the base-bituminous concrete interface leads to the highest reduction in fatigue (horizontal) strain. The highest decrease of vertical strain occurs when the reinforcement is placed at the interface of base and sub grade layers.

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