Strategies for the Application of the Falling Weight Deflectomer to Evaluate Load Transfer Efficiency at Joints in Jointed Concrete Pavements

2009 ◽  
pp. 395-395-9 ◽  
Author(s):  
DJ Jackson ◽  
MR Murphy ◽  
A Wimsatt
Keyword(s):  
Load Transfer ◽  
Transfer Efficiency ◽  
Concrete Pavements ◽  
Load Transfer Efficiency ◽  
Falling Weight ◽  
Jointed Concrete Pavements

Development of Dowel Looseness Prediction Model for Jointed Concrete Pavements

1996 ◽  
Vol 1525 (1) ◽  
pp. 21-27 ◽  
Author(s):  
Neeraj Buch ◽  
Dan G. Zollinger
Keyword(s):  
Prediction Model ◽  
Load Transfer ◽  
Laboratory Data ◽  
Fault Prediction ◽  
Transfer Efficiency ◽  
Oxide Content ◽  
Concrete Pavements ◽  
Bearing Stress ◽  
Load Transfer Efficiency ◽  
Jointed Concrete Pavements

The results of an in-depth study of factors that affect dowel looseness in jointed concrete pavements are presented. The laboratory investigation revealed the influence of aggregate type (in relation to oxide content), aggregate texture and shape, bearing stress (dowel diameter and crack width), load magnitude, and number of load cycles on the magnitude of dowel looseness and the subsequent loss in load transfer efficiency across saw-cut joints. A discussion is included on the development of an empirical-mechanistic dowel looseness prediction model based on the experimental results. Results of the sensitivity analysis of the dowel looseness prediction model (using laboratory data) are also presented. An associated scope of this research was to develop a relationship between dowel looseness and loss of load transfer efficiency. The sequential use of the dowel looseness prediction model and its relationship to load transfer efficiency allows the design engineer to predict load transfer characteristics of a joint, based on calculated (or measured) dowel looseness. The framework suggested to predict dowel looseness can then be incorporated into a fault prediction model for doweled joints.

Effect of Concrete Mix Consolidation on Joint Faulting and Load Transfer Efficiency

1996 ◽  
Vol 1544 (1) ◽  
pp. 3-8
Author(s):  
Mustaque Hossain ◽  
John B. Wojakowski
Keyword(s):  
Load Transfer ◽  
Plain Concrete ◽  
Concrete Pavement ◽  
Transfer Efficiency ◽  
Unit Weight ◽  
Concrete Pavements ◽  
Falling Weight Deflectometer ◽  
Rate Of Increase ◽  
Load Transfer Efficiency ◽  
Falling Weight

Six jointed reinforced concrete pavement and one jointed plain concrete pavement test sections on US-69 in Miami County, Kansas, constructed in 1979 have been surveyed annually for faulting for the past 9 years. Falling weight deflectometer tests were conducted in 1995 to assess the load transfer efficiency of the joints. The results show that, in general, as the original concrete density increases due to improved consolidation, the rate of increase of the joint fault depth decreases at doweled joints at a given pavement age. The occurrence of joint faulting is much more severe when load transfer devices are not present; this was observed even for the pavement section built on a nonerodible subbase. Improved consolidation sometimes appeared to help improve load transfer, resulting in a lower rate of faulting. Thus, the mandatory density requirement of 98 percent rodded unit weight, which has been in effect since 1980, has undoubtedly led to better joint performance for concrete pavements in Kansas.

Research on Load Transfer Efficiency of GFRP Dowel in Jointed Plain Concrete Pavement

2012 ◽  
Vol 178-181 ◽  
pp. 1152-1155 ◽  
Author(s):  
Luo Ke Li ◽  
Yun Liang Li ◽  
Yi Qiu Tan ◽  
Zhong Jun Xue
Keyword(s):  
Finite Element ◽  
Load Transfer ◽  
Concrete Slab ◽  
Three Dimensional ◽  
Plain Concrete ◽  
Element Model ◽  
Transfer Efficiency ◽  
Engineering Practice ◽  
Concrete Pavements ◽  
Load Transfer Efficiency

In a jointed plain concrete pavements, the dowel bar system are used to provide lateral load transfer across transverse joint. Corrosion of commonly used steel dowel in engineering practice reduces their service life and costs considerable maintenance and repair spending for concrete pavements. The objective of this study focus primarily on the performance of none eroded GFRP dowel on LTE( load transfer efficiency) with the help of a three-dimensional finite-element model. The amount of LTE can be obtained directly from comparing the maximum deflection of the concrete slab and the level tensile stress under the concrete slab. According to the finite element results, the larger-diameter GFRP dowel are found to perform the best in this study.

scholarly journals Laboratory Characterization of The Load Transfer-Crack Width Relation for Innovative Short Concrete Slabs Pavements

2020 ◽  
Vol 15 (1) ◽  
pp. 232-250 ◽  
Author(s):  
Mauricio Pradena ◽  
Lambert Houben ◽  
Andrés César
Keyword(s):  
Structural Design ◽  
Crack Width ◽  
Load Transfer ◽  
Plain Concrete ◽  
Design Methods ◽  
Transfer Efficiency ◽  
Concrete Slabs ◽  
Concrete Pavements ◽  
Load Transfer Efficiency ◽  
Reduced Scale

Aggregate interlock is the dominant load transfer mechanism in non-dowelled Jointed Plain Concrete Pavements, as the innovative short concrete slabs. Although the Load Transfer Efficiency of this pavement innovation is based on that mechanism, the structural design methods do not relate the Load Transfer Efficiency by aggregate interlock with its direct cause, which is the Crack Width under the joints. The objective of the present article is to characterise in the laboratory the Load Transfer Efficiency−Crack Width relation for innovative short slabs Jointed Plain Concrete Pavements. Additionally, as an alternative to large-scale laboratory tests to study the Load Transfer Efficiency, a practical test on a reduced scale is proposed. The results confirmed that short slabs Jointed Plain Concrete Pavements with high-quality aggregates are able to provide adequate Load Transfer Efficiency (above 70%) without dowels bars. Based on the laboratory results, complemented with previous field data, a Load Transfer Efficiency−Crack Width curve is proposed and made available for structural design methods of short slabs Jointed Plain Concrete Pavements. Finally, the laboratory test on a reduced scale is useful to develop specific Load Transfer Efficiency−Crack Width relations using standard equipment available in traditional concrete laboratories.

scholarly journals Toward the Development of Load Transfer Efficiency Evaluation of Rigid Pavements by a Rolling Wheel Deflectometer

2020 ◽  
Vol 5 (1) ◽  
pp. 7
Author(s):  
Pawan Deep ◽  
Mathias B. Andersen ◽  
Nick Thom ◽  
Davide Lo Presti
Keyword(s):  
Load Transfer ◽  
Three Dimensional ◽  
Transfer Efficiency ◽  
Falling Weight Deflectometer ◽  
Rigid Pavement ◽  
Important Indicator ◽  
Rigid Pavements ◽  
Load Transfer Efficiency ◽  
Rolling Wheel ◽  
Falling Weight

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.

scholarly journals Analysis of stresses in concrete pavement under a dowel according to its diameter and load transfer efficiency

2015 ◽  
Vol 42 (11) ◽  
pp. 845-853 ◽  
Author(s):  
Piotr Mackiewicz
Keyword(s):  
Load Transfer ◽  
Concrete Slab ◽  
Concrete Pavement ◽  
Transfer Efficiency ◽  
Compressive Stresses ◽  
Transverse Joint ◽  
Load Transfer Efficiency ◽  
Different Diameters ◽  
3D Finite Element Method ◽  
Falling Weight

The suitable load transfer between adjacent concrete slabs in transverse joint is influenced by various parameters. In this paper, the influence of different diameters and spacing of dowel bars on the slab interaction was considered. Calculations were carried out with application of 3D finite element method. Verification of the model was performed with the concrete pavement in Poland. Results of these calculations were compared with falling weight deflectometer studies. Calculations of stress concentration around dowel bars for different conditions and parameters enabled to determine a relationship between load transfer efficiency (LTE) and vertical compressive stresses in the concrete slab. It was found that application of dowels with small diameters can promote damages in the concrete slab because of concentration of vertical compressive stresses under the dowel bar. The found relationship enables to determine stresses in concrete under the dowel according to its diameter and LTE.

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