EVALUATION OF RIGID PAVEMENTS BY DEFLECTION APPROACH (original) (raw)
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Most of the road network in India has a significant level of deterioration and therefore requires major rehabilitation projects; in general, most of these rehabilitation activities involve a new asphalt layer on the original pavement structure; knowledge and analysis of structural capacity of the pavement is essential to perform a durable and economical rehabilitation design. The determination of the structural capacity of flexible pavements as a function of the deflections produced by the application of a load. The techniques most used in many countries to measure pavement deflections are the Falling Weight Deflectometer (FWD) and the Benkelman beam, the first one works under dynamic loading and the second device under static loading. The use of devices under static loading has not been recommended by several design methodologies, including AASHTO, but these are still used widely in many countries including India, for this reason it is necessary to compare the deflections by Benkelman beam and falling weight deflectmeter. In this study deflections measure by BBD and FWD techniques on 30 deflection observation points on selected 1.5 km flexible urban highway stretch. Both test are perform simultaneously on marking points. And data collected by booth test are as per IRC: 81-1997 and IRC: 115-2014.
International Journal For Science Technology And Engineering, 2017
Most of the road network in India has a significant level of deterioration and therefore requires major rehabilitation projects; in general, most of these rehabilitation activities involve a new asphalt layer on the original pavement structure; knowledge and analysis of structural capacity of the pavement is essential to perform a durable and economical rehabilitation design. The determination of the structural capacity of flexible pavements as a function of the deflections produced by the application of a load. The techniques most used in many countries to measure pavement deflections are the Falling Weight Deflectometer (FWD) and the Benkelman beam, the first one works under dynamic loading and the second device under static loading. The use of devices under static loading has not been recommended by several design methodologies, including AASHTO, but these are still used widely in many countries including India, for this reason it is necessary to compare the deflections by Benkelman beam and falling weight deflectmeter. In this study deflections measure by BBD and FWD techniques on 30 deflection observation points on selected 1.5 km flexible urban highway stretch. Both test are perform simultaneously on marking points. And data collected by booth test are as per IRC: 81-1997 and IRC: 115-2014.
Evaluating the Performance of Dowel in PCC Pavement of Roads using ABAQUS Finite Element Software
2018
In Portland Cement Concrete (PCC) pavement of the roads, dowels bar transfers vehicle loading to the unloaded slab. Load Transfer Efficiency (LTE) is used to evaluate dowel bars in PCC pavement. This parameter is defined as the vertical displacement ratio of the loaded slab versus the unloaded slab. In this study, the impact of effective factors (friction coefficient between dowel and concrete slab, wheel loading, dowel diameter and dowel spacing) on load transfer efficiency was studied with modeling by using the ABAQUS finite element software. The verification process was presented to increase confidence in model results and the response data from the numerical simulation agrees well with analytical solution. The results show that with increasing the friction coefficient between slab and dowel, load transfer efficiency increases but the failure of concrete around dowel bars was found to initiate at the face of joint. Furthermore, if strains remain in elastic range, increasing in wh...
Procedia Engineering, 2017
Within the the National Sustainability Programme I, project of Transport R&D Centre (LO1610), the determination of measured jointed plain concrete pavements deflections to load was monitored. Impacts of climate and other effects upon resulting concrete pavement deflections were studied in the first place. The main issue for FWD measurements is the selection of suitable climatic conditions. In addition, loading transfer efficiency (LTE) at slab joints, which is a specific feature of concrete road pavements, was studied.
Strengthening and Maintenance of a Flexible Road Pavement Using Benkelman Beam Deflection Method
IRJET, 2022
The expansion in commercial, industrial and residential regions has led to a rapid increase in the traffic further causing the deterioration of the pavements. A distressed pavement requires effective maintenance, and maintenance expenditure can be reduced through proper planning, design, construction and quality control. In order to keep the pavements in good serviceable condition, it is necessary to complete the functional and structural evaluation. In the present study, two stretches of 5km each of a Major District Road in Painavu in Idukki district, Kerala, is selected as study areas for the improvement. Functional evaluation is completed through visual observation and pavement evaluation survey is done using odometer. Structural evaluation using Benkelman Beam Deflection technique (BBD) to evaluate the deflection of the pavement and Core Cutting to understand about the existing pavement composition is done. Samples of the subgrade soils are collected and traffic of the area is also studied. Data obtained is analyzed and an appropriate overlay design is selected based on the characteristic deflection and design traffic.
Transportation Research Record, 2003
A direct and simple method (YONAPAVE) for evaluating the structural needs of flexible pavements is presented. It is based on the interpretation of measured FWD deflection basins using mechanistic and practical approaches. YONAPAVE estimates the effective Structural Number (SN) and the equivalent subgrade modulus independently of the pavement or layer thicknesses. Thus, there is no need to perform boreholes which are expensive, time consuming and disruptive to traffic. Knowledge of the effective SN and the subgrade modulus, together with an estimate of the traffic demand, allows for the determination of the overlay required to accommodate future needs. YONAPAVE simple equations can be solved using a pocket calculator, making it suitable for rapid estimates in the field. The simplicity of the method, and its independency of major computer programs, makes YONAPAVE suitable for estimating the structural needs of a road network using FWD data collected on a routine or periodic basis along the network roads. With increasing experience and confidence, YONAPAVE can be used as the basis for NDT structural evaluation and overlay design at the project level.
2012
The paper describes a procedure where the condition of flexible pavements is investigated with the help of non-destructive tests such as the Falling Weight Deflectometer (FWD). The condition or indication of structural strength is expressed in terms of the Structural Number (SN). An existing method of determining the Structural Number was used as benchmark with data from a recent detailed pavement investigation. The benchmark SN determination also makes use of the Dynamic Cone Penetrometer (DCP) method. Previously only limited aspects of the measured deflection bowl were used to determine SN non-destructively. In this improved procedure additional deflection bowl parameters were investigated for their possible improvement in the determination of the SN or PN. The proposed method was therefore benchmarked against existing methods to determine SN for a pavement to see if it can lead to an improvement in determining SN values.
Infrastructures, 2020
The jointed rigid pavement is currently evaluated by the Falling weight deflectometer which is rather slow for the testing of the jointed pavements. Continuous nondestructive evaluation of rigid pavements with a rolling wheel deflectometer can be used to measure the load transfer and is investigated. Load transfer is an important indicator of the rigid pavement’s condition and this is the primary factor which is studied. Continuous data from experimental measurements across a joint allows for the determination of not only the load transfer efficiency provided parameters characterizing the pavement is known. A three-dimensional semi-analytical model was implemented for simulating the pavement response near a joint and used for interpretation and verification of the experimental data. Results show that this development is promising for the use of a rolling wheel deflectometer for rapid evaluation of joints.
REVIEW OF FALLING WEIGHT DEFLECTOMETER FOR ASSESSMENT OF FLEXIBLE PAVEMENT
ELK ASIA PACIFIC JOURNAL OF CIVIL ENGINEERING AND STRUCTURAL DEVELOPMENT , 2018
Fast development of road networks has become a trend in India and everywhere in the world. From the past couple of decades, it has been observed that numerous highways are in a phase of deteriorations. Identifying the reasons for deteriorations requires a pavement evaluation study. Many performances study have been made out by exploring flexible pavements, by the users of widely accepted falling weight deflectometer (FWD) as a non-destructive test (NDT) and considered it as a standard for structure assessment. The primary objective of this study is to a review of an FWD instrument and the also study of the empirically derived methods and a back calculation process for computing layer moduli and factors influencing it. The essential need of correction factors to get reliable layer moduli is an also discussed, in addition to the investigation of advancement of low-cost indigenous FWD models flexible pavements, by the users of widely accepted falling weight deflectometer (FWD) as a non-destructive test (NDT) and considered it as a standard for structure assessment. The primary objective of this study is to a review of an FWD instrument and the also study of the empirically derived methods and a back calculation process for computing layer moduli and factors influencing it. The essential need of correction factors to get reliable layer moduli is an also discussed, in addition to the investigation of advancement of low-cost indigenous FWD models