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Reclaimed Asphalt Pavement (RAP) has gained significant attention in recent years as a sustainable alternative to natural aggregate in road construction. This study presents a comparison of the physical attributes of RAP and natural... more
Reclaimed Asphalt Pavement (RAP) has gained significant attention in recent years as a sustainable alternative to natural aggregate in road construction. This study presents a comparison of the physical attributes of RAP and natural aggregate, with a focus on their potential use as base and subbase materials in flexible pavements. The physical attributes of RAP and natural aggregate were evaluated using standard laboratory tests, including particle size distribution, specific gravity, water absorption, impact value test, Los Angles Abrasion test, flakiness and elongation test. The research concluded that RAP is comparable to natural aggregate in terms of particle size distribution and bulk density but has lower water absorption, impact, and abrasion values. The results shows that RAP is almost 53% more tougher that natural aggregate when tested for Aggregated Impact test and 30% more harder than natural aggregate when compared by Los Angeles abrasion test. Also, heatmap was used to ...
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Abstract-: The road traffic has increased manifolds during the post-independence in India. The traffic axle loading may be much heavier than the specified limit in many cases. As a result of which, the existing road network has been... more
Abstract-: The road traffic has increased manifolds during the post-independence in India. The traffic axle loading may be much heavier than the specified limit in many cases. As a result of which, the existing road network has been subjected to severe deterioration leading to premature failure of the pavements. There is a dire need of developing a meaningful approach towards implementing the maintenance and rehabilitation schemes of the road network. In such a scenario, development of the effective pavement management strategies would furnish useful information to ensure the compatible and cost- effective decisions so as to keep the existing road network intact. The optimum maintenance and rehabilitation strategies applied in this study would be useful in planning pavement maintenance strategies in a scientific manner and ensuring rational utilization of limited maintenance funds. Once this strategy for urban road network is implemented and made operational; this would serve as win...
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The growth of traffic in India has been exponential post independence. The specified traffic axle load limit is generally disobeyed with higher axle load vehicles plying over them. This results in severe deterioration of road pavements... more
The growth of traffic in India has been exponential post independence. The specified traffic axle load limit is generally disobeyed with higher axle load vehicles plying over them. This results in severe deterioration of road pavements causing to premature failure of the pavements. Hence determining effective pavement management strategies could result in helpful information to enact cost-effective and compatible decisions for an intact road network. The pavement deterioration models may turn out to be effective in assisting highway agencies to predict the economical results of possible investment decisions based on the pavements maintenance and management.
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A noteworthy quantum of greenhouse gas (GHG) emissions is emitted due to the construction and maintenance of bituminous pavements and contributes to global warming. In order to curb GHG emissions, sustainable construction methods like... more
A noteworthy quantum of greenhouse gas (GHG) emissions is emitted due to the construction and maintenance of bituminous pavements and contributes to global warming. In order to curb GHG emissions, sustainable construction methods like soil stabilization with waste materials need to be incorporated in practice by engineers. In this study, the subgrade layer of pavement was stabilized with pond ash, a waste material generated from burning of coal in thermal power plants. California bearing ratio and Proctor (modified) tests were carried out to determine the strength and compaction characteristics, respectively. The proposed stabilization enhanced the bearing strength of the subgrades. The improved strength characteristics of the subgrade resulted in the reduced requirement of materials and their transportation, eventually minimizing GHG emissions. For broad applicability, the study was carried out on six different soils of altering plasticity, which is found predominantly in north Ind...
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Weak soils cannot be used in subgrade course of pavements and need to be stabilized, for which different commercial chemical stabilizers are available that claim their superiority over traditional stabilizers like lime and cement. RBI... more
Weak soils cannot be used in subgrade course of pavements and need to be stabilized, for which different commercial chemical stabilizers are available that claim their superiority over traditional stabilizers like lime and cement. RBI Grade 81 is one such patented soil stabilizer, and this paper aims to review the geotechnical and geo-environmental properties of RBI Grade 81 stabilized soils for use in the construction of sustainable highways. Regarding the stabilized soils, strength parameters (unconfined compressive strength, California bearing ratio and Brazilian tensile strength), compaction parameters (optimum moisture content and maximum dry density), consolidation parameters (void ratio and compression index), fatigue life, plasticity, durability, chemical composition, mineralogical composition and surface morphology through scanning electron microscopy were reviewed. The effects of the dosage of the stabilizer, curing period and time of elapse were also reviewed along with i...
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In India, the road traffic volume has increased manifolds during the post-independence period. The traffic axle loading may also in many cases be much heavier than the specified limit. As a result of which, the existing road network has... more
In India, the road traffic volume has increased manifolds during the post-independence period. The traffic axle loading may also in many cases be much heavier than the specified limit. As a result of which, the existing road network has been subjected to severe deterioration leading to premature failure of the pavements.In such a scenario, development of the effective pavement management strategies would furnish useful information to ensure the compatible and costeffective decisions so as to keep the existing road network intact. The pavement deterioration models can prove to be an effective tool which can assist highway agencies to forecast economic and technical outcome of possible investment decisions regarding maintenance management of pavements. The optimum maintenance and rehabilitation strategies developed in this study would be useful in planning pavement maintenance strategies in a scientific manner and ensuring rational utilization of limited maintenance funds. Once this s...
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Objectives: To reduce the life-cycle carbon footprint of a flexible pavement using RBI grade 81, a patented natural soil stabilizer. Methods: This paper outlines the common guidelines for estimation of greenhouse gas emissions associated... more
Objectives: To reduce the life-cycle carbon footprint of a flexible pavement using RBI grade 81, a patented natural soil stabilizer. Methods: This paper outlines the common guidelines for estimation of greenhouse gas emissions associated with a pavement as per the Indian environmental conditions. California Bearing Ratio (CBR) tests were carried out on subgrade soil treated with diverse proportions of RBI grade 81. Greenhouse gas emissions due to the initial construction phase and maintenance activities over a 20 year life cycle were assessed and compared for RBI grade 81 treated and non-treated subgrades. Key sources of carbon footprint considered were construction materials and transportation with construction equipments having negligible contribution. Findings: Studies reveal significant improvement in the CBR of the subgrade soil leading to reduction of pavement layer thicknesses thereby limiting the requirements of resources that is to say materials, fuel and machinery. The total CO 2 emissions were reduced from 910.9 tonnes to 750.8 tonnes per km length of a four lane dual carriageway road by treating the subgrade soil with 4% RBI grade 81. The production of materials and transportation used to construct the project account for 93% and 7% of the total CO 2 emissions throughout the life cycle of the pavement. Improvements: Use of RBI grade 81 results in attenuation of greenhouse gas emissions which were found consequential in amassing of carbon credits, a step towards safeguarding the environment for the future generations to come.
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An increase in the generation of industrial waste materials such as pond ash and brick kiln dust represents a serious threat to the earth’s environment. The waste materials have novel characteristics and therefore their physical,... more
An increase in the generation of industrial waste materials such as pond ash and brick kiln dust represents a serious threat to the earth’s environment. The waste materials have novel characteristics and therefore their physical, chemical, mineralogical, morphological, mechanical, and toxicity characteristics were determined so that these materials can be incorporated as construction materials based on technical and environmental considerations. The purpose of this study is to utilize the wastes in the stabilization of clay geomaterial to outperform existing problems of inadequate strength and stiffness of the subgrade layer in flexible pavements. Mixtures of geomaterials, containing pond ash, brick kiln dust, and their combination were prepared and important engineering characteristics such as the plasticity, compaction, and strength of the mixtures were examined. The measurement of response to dynamic loading is a pre-condition for the accurate characterization of geomaterials use...