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.

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 Experimental continuously reinforced concrete pavement parameterization using nondestructive methods

2016 ◽  
Vol 9 (2) ◽  
pp. 263-274
Author(s):  
L. S. Salles ◽  
J. T. Balbo
Keyword(s):  
Reinforced Concrete ◽  
Load Transfer ◽  
Structural Condition ◽  
Concrete Pavement ◽  
Pavement Performance ◽  
Falling Weight Deflectometer ◽  
Matching Process ◽  
Load Transfer Efficiency ◽  
Falling Weight ◽  
The University

ABSTRACT Four continuously reinforced concrete pavement (CRCP) sections were built at the University of São Paulo campus in order to analyze the pavement performance in a tropical environment. The sections short length coupled with particular project aspects made the experimental CRCP cracking be different from the traditional CRCP one. After three years of construction, a series of nondestructive testing were performed - Falling Weight Deflectometer (FWD) loadings - to verify and to parameterize the pavement structural condition based on two main properties: the elasticity modulus of concrete (E) and the modulus of subgrade reaction (k). These properties estimation was obtained through the matching process between real and EverFE simulated basins with the load at the slab center, between two consecutive cracks. The backcalculation results show that the lack of anchorage at the sections end decreases the E and k values and that the longitudinal reinforcement percentage provides additional stiffness to the pavement. Additionally, FWD loadings tangential to the cracks allowed the load transfer efficiency (LTE) estimation determination across cracks. The LTE resulted in values above 90 % for all cracks.

scholarly journals Evaluation of Load-Transfer Efficiency of Steel Mesh Reinforced Contraction Joints in Concrete Pavement: Accelerated Pavement Test and FE Analysis

Teknik Dergi ◽  
2021 ◽  
Author(s):  
Muhammet ÇELİK ◽  
Mehmet Tevfik SEFEROĞLU ◽  
Muhammet Vefa AKPINAR ◽  
Mohammad Manzoor NASERY ◽  
Ayşegül Güneş SEFEROĞLU
Keyword(s):  
Load Transfer ◽  
Fe Analysis ◽  
Concrete Pavement ◽  
Transfer Efficiency ◽  
Steel Mesh ◽  
Contraction Joints ◽  
Load Transfer Efficiency

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.

Structural Evaluation of the Transverse Joint of a Concrete Pavement Considering the Degradation Process

2019 ◽  
Vol 2673 (7) ◽  
pp. 319-328
Author(s):  
Tatsuo Nishizawa ◽  
Yuya Wakabayashi ◽  
Masataka Uchida ◽  
Masayuki Yabu
Keyword(s):  
Elastic Moduli ◽  
Load Transfer ◽  
Three Dimensional ◽  
Degradation Process ◽  
Concrete Pavement ◽  
Transverse Joint ◽  
Dimensional Finite Element ◽  
Years Of Service ◽  
Load Transfer Efficiency ◽  
Three Dimensional Finite Element

Effective maintenance of a concrete pavement requires precise evaluation of the load transfer efficiency (LTE) at the transverse joint, which is simply calculated from the falling weight deflectometer (FWD) deflections at the loaded and unloaded slabs. In this study, the FWD deflections were simulated with the randomly generated elastic moduli of the pavement layers using the three dimensional finite element method considering the degradation process at a joint, which was categorized into five stages, from completely sound, to having broken dowels and a void underneath the joint. A database of FWD deflections, layer elastic moduli and the associated stage was created from the simulation results. The layer moduli were identified from the measured FWD deflections at a joint by searching the closest calculated FWD deflections to those measured from the database. The results of the analysis not only provide the layer moduli, but also the degradation stage of the joint to help engineers determine the appropriate rehabilitation measures. The method was validated on a 16 year old concrete pavement, on which the FWD measurements were performed three times: just before opening to traffic, after 9 years and 16 years of service. The identified layer moduli were not changed after 16 years of service, and some joints degraded owing to dowel corrosion, broken dowels and the existence of voids underneath the joints. The developed method is able to show the entire picture of the state of the joints in a section and also provide information on which parts of a particular joint have deteriorated.

Evaluation of structural responses of continuously reinforced concrete pavement (CRCP) using falling weight deflectometer

2016 ◽  
Vol 43 (1) ◽  
pp. 28-39 ◽  
Author(s):  
Pangil Choi ◽  
Dong-Ho Kim ◽  
Bong-Hak Lee ◽  
Moon C. Won
Keyword(s):  
Reinforced Concrete ◽  
Transverse Crack ◽  
Load Transfer ◽  
Structural Condition ◽  
Concrete Pavement ◽  
Crack Spacing ◽  
Falling Weight Deflectometer ◽  
Structural Responses ◽  
Load Transfer Efficiency ◽  
Falling Weight

The objective of this study is to suggest reasonable structural evaluation method of continuously reinforced concrete pavement (CRCP) using falling weight deflectometer (FWD). The effects of transverse crack spacing and temperature conditions were investigated in CRCP sections with various slab thicknesses and pavement ages. A total of 20 CRCP sections were selected throughout Texas and structural responses were evaluated from 2006 to 2013 for 8 testing years. Test results show that transverse crack spacing has little effect on deflection and load transfer efficiency (LTE). The LTE values were maintained at above 90%, regardless of crack spacing, temperature condition or pavement age. Temperature variations had small effects on deflections at cracks and the mid-slab, but almost no effects on LTE. Maximum deflections and back-calculated k-values appear to be better indicators of structural condition of CRCP than LTE. Load transfer efficiency is not the best indicator of structural condition of transverse cracks in CRCP. Deficiencies in slab support are the primary cause of full-depth distresses in Texas, and back-calculated k-values, which combine both a maximum deflection and the shape of deflection bowl from FWD testing, may be a better indicator of the structural condition of CRCP.

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