Analysis of Concrete Pavement Responses to Temperature and Wheel Loads Measured from Intrumented Slabs

1998 ◽  
Vol 1639 (1) ◽  
pp. 94-101 ◽  
Author(s):  
H. Thomas Yu ◽  
Lev Khazanovich ◽  
Michael I. Darter ◽  
Ahmad Ardani
Keyword(s):  
Structural Response ◽  
Plain Concrete ◽  
Negative Temperature ◽  
Concrete Pavement ◽  
Temperature Gradients ◽  
Critical Conditions ◽  
Test Analysis ◽  
Longitudinal Edge ◽  
Critical Edge ◽  
Using Data

The structural response of jointed plain concrete pavement slabs was evaluated using data obtained from instrumented slabs. The instrumented slabs were a part of newly constructed jointed plain concrete overlay that was constructed on existing asphalt concrete pavement on I–70 in Colorado, near the Kansas–Colorado border. The instrumentation consisted of dial gauges for measuring curling deflections at the slab corner and longitudinal edge and surface-mounted strain gauges for measuring load strains at the longitudinal edge at midslab. The through-thickness temperature profiles in the pavement slabs were also measured at 30-min intervals during the field test. Analysis of the field data showed that the instrumented slabs had a considerable amount of built-in upward curling and that concrete slabs on a stiff base can act completely independent of the base or monolithically with the base, depending on the loading condition. The built-in upward curling of the slabs has the same effect as negative temperature gradients. These findings suggest that the effects of temperature gradients on the critical edge stresses may not be as great as previously thought and that the corner loading, in some cases, may produce more critical conditions for slab cracking. Another important finding of this study is that a physical bond between pavement layers is not required to obtain a bonded response from concrete pavements.

scholarly journals A Parametric Study of Jointed Plain Concrete Pavement Using Finite Element Modeling

2017 ◽  
Vol 11 (11) ◽  
pp. 75
Author(s):  
Monireh Zokaei ◽  
Mansour Fakhri ◽  
Saeed Rahiminezhad
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Thermal Stresses ◽  
Structural Response ◽  
Plain Concrete ◽  
Concrete Pavement ◽  
Model Parameters ◽  
3D Fem ◽  
Element Modeling ◽  
Axle Loads

Concrete pavements face various types of distresses such as longitudinal, transverse, and joint cracking due to traffic loading and thermal stresses. The objective of this investigation was to develop Three-Dimensional Finite-Element Models (3D-FEM) to assess the performance of dowel in Jointed Plain Concrete Pavement (JPCP).Finite-element modeling is a powerful tool that can be used for the simulation of the structural response of pavements under the effects of different loading condition. Most of the previous studies ignored important factors, including the combined effect of dynamic axle loads and thermal gradient. Overcoming the shortcomings of the previous studies, this study investigated the pavement response under the effect of some model parameters. The result of the study was verified by a comparison with field measurements. Results also showed that the combined negative gradient and axle loads located at the transverse joint subject the top of mid-slab, to high tensile stress that may explain the initiation of top-down cracks. These stresses increase under corner loading when the slab length is increased. In general, the study presented that the developed 3D-FEM is suitable for identifying the effect of different design features including pavement geometry, material properties, thermal gradients, and axle load and configuration on the structural response of rigid pavements.

Performance of a Rehabilitated D-Cracked Jointed Plain Concrete Airfield Pavement

1997 ◽  
Vol 1568 (1) ◽  
pp. 148-154
Author(s):  
Robert K. Kumapley ◽  
Emmanuel B. Owusu-Antwi
Keyword(s):  
Portland Cement ◽  
Plain Concrete ◽  
Structural Condition ◽  
Concrete Pavement ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Heavy Weight ◽  
Bonding Condition ◽  
Years Of Service ◽  
Using Data

The results of a study conducted to assess the performance of a D-cracked pavement rehabilitated between 1986 and 1989 are presented. The original pavement, located at Forbes Field in Topeka, Kansas, consisted of a thick jointed plain concrete pavement (JPCP) placed directly on a clay subgrade and had D-cracking in the top 102 mm (4 in.). The D-cracking was removed completely by milling before the placement of a bonded JPCP overlay. The major concerns were ( a) the bonding condition between the overlay and the original JPCP, ( b) the extent of D-cracking progression in the original JPCP, if any, after rehabilitation, and ( c) the structural condition of the overlay and the original JPCP. These concerns were investigated using data from heavy weight deflectometer tests performed at the center, corner, and edge of the JPCP slabs. Cores from the rehabilitated pavement were also inspected. The results of the study indicate that, after 6 to 9 years of service, the rehabilitated JPCP is in good structural condition. Significant friction and bonding still exist between the overlay and the original JPCP layer. These results may be useful to pavement engineers considering a bonded portland cement concrete overlay for rehabilitation of D-cracked JPCP.

New Long-Life Concrete Pavements in the Czech Republic

2021 ◽  
Author(s):  
Bohuslav Slánský ◽  
Vit Šmilauer ◽  
Jiří Hlavatý ◽  
Richard Dvořák
Keyword(s):  
Isothermal Calorimetry ◽  
Coupled Model ◽  
Plain Concrete ◽  
Pilot Project ◽  
Economic Benefits ◽  
Concrete Pavement ◽  
Technical Solution ◽  
Concrete Pavements ◽  
Hydration Kinetics

A jointed plain concrete pavement represents a reliable, historically proven technical solution for highly loaded roads, highways, airports and other industrial surfaces. Excellent resistance to permanent deformations (rutting) and also durability and maintenance costs play key roles in assessing the economic benefits, rehabilitation plans, traffic closures, consumption and recycling of materials. In the history of concrete pavement construction, slow-to-normal hardening Portland cement was used in Czechoslovakia during the 1970s-1980s. The pavements are being replaced after 40-50 years of service, mostly due to vertical slab displacements due to missing dowel bars. However, pavements built after 1996 used rapid hardening cements, resulting in long-term surface cracking and decreased durability. In order to build durable concrete pavements, slower hardening slag-blended binders were designed and tested in the restrained ring shrinkage test and in isothermal calorimetry. Corresponding concretes were tested mainly for the compressive/tensile strength evolution and deicing salt-frost scaling to meet current specifications. The pilot project was executed on a 14 km highway, where a unique temperature-strain monitoring system was installed to provide long-term data from the concrete pavement. A thermo-mechanical coupled model served for data validation, showing a beneficial role of slower hydration kinetics. Continuous monitoring interim results at 24 months have revealed small curling induced by drying and the overall small differential shrinkage of the slab.

scholarly journals Experimental Study on Doweled Expansion Joints on Behavior for Plain Concrete Pavement System

2018 ◽  
Vol 14 (3) ◽  
pp. 68-80
Author(s):  
Zainab Ahmed Al-kaissi ◽  
Mohammed Hashim Mohammed ◽  
Nabaa Sattar Kareem
Keyword(s):  
Failure Load ◽  
Concrete Slab ◽  
Concrete Strength ◽  
Plain Concrete ◽  
Concrete Pavement ◽  
Type I ◽  
Expansion Joints ◽  
Subgrade Soil ◽  
Dowel Bar ◽  
Bar Diameter

This paper deals with load-deflection behavior the jointed plain concrete pavement system using steel dowel bars as a mechanism to transmit load across the expansion joints. Experimentally, four models of the jointed plain concrete pavement system were made, each model consists of two slabs of plain concrete that connected together across expansion by two dowel bars and the concrete slab were supported by the subgrade soil. Two variables were dealt with, the first is diameter of dowel bar (12, 16 and 20 mm) and the second is type of the subgrade soil, two types of soil were used which classified according to the (AASHTO): Type I (A-6) and type II (A-7-6). Experimental results showed that increasing dowel bar diameter from 12 mm to 20 mm has a little effect on load-deflection behavior of the tested specimens with only 5% increase in failure load. This may be attributed to that the failure (caused by flexural crack) depends mainly on concrete strength. Results also showed that decreasing CBR value of subgrade soil from 7% to 5% decreases failure load by about 33%.

scholarly journals Sensitivity quantification of jointed plain concrete pavement mechanistic-empirical performance predictions

2013 ◽  
Vol 43 ◽  
pp. 545-556 ◽  
Author(s):  
Halil Ceylan ◽  
Sunghwan Kim ◽  
Kasthurirangan Gopalakrishnan ◽  
Charles W. Schwartz ◽  
Rui Li
Keyword(s):  
Plain Concrete ◽  
Concrete Pavement ◽  
Performance Predictions ◽  
Empirical Performance

A novel method using infrared thermography for hot fluid leakage detection on surfaces with uneven emissivities

2021 ◽  
Vol 63 (5) ◽  
pp. 273-279
Author(s):  
Xiao Zhao ◽  
Qi Zhang ◽  
Xiang Xu ◽  
Zhibin Shen ◽  
Bo Zhang
Keyword(s):  
Infrared Thermography ◽  
Negative Temperature ◽  
Temperature Gradients ◽  
Heating Process ◽  
Positive Temperature ◽  
Leakage Detection ◽  
Surface Emissivity ◽  
Uneven Surface ◽  
Transient Heating ◽  
Fluid Leakage

Uneven surface emissivity will cause illusory temperature variation in infrared surface temperature mapping. For this reason, most of the detailed reviews on the use of infrared thermography (IRT) for leakage detection have mainly focused on surfaces with homogeneous emissivity or the recognition of negative temperature gradients, while reports on sensing hot fluid leakage for uneven surface emissivity are very rare. In this study, a hypothesis is put forward and a new leakage detection method is proposed that uses a transient heating-cooling-heating process in association with a subtraction method of infrared images to eliminate the disturbance of inhomogeneous valve surface emissivities. A theoretical analysis is established that is experimentally tested as a case study. The results shows that the hypothesis is clear and the effect of the uneven emissivity is suppressed for the recognition of positive temperature gradients (hot fluid leakage) on a metal valve sample. The current work provides new insights on the modification of the surface emissivity under certain conditions, which has been a major limitation of passive IRT in the past.

Preliminary Failure Analysis and Structural Design of a Morphing Winglet for Green Regional Aircraft

2018 ◽  
Author(s):  
Ignazio Dimino ◽  
Salvatore Ameduri ◽  
Antonio Concilio
Keyword(s):  
Failure Analysis ◽  
Structural Design ◽  
Failure Modes ◽  
Structural Response ◽  
Operational Reliability ◽  
Control Device ◽  
Critical Conditions ◽  
Next Generation ◽  
Novel Technologies ◽  
Actuation System

Aircraft wing design optimization typically requires the consideration of many competing factors accounting for both aerodynamics and structures. To address this, research on morphing aircraft has shown its potential by providing large benefits on aircraft performance. In particular, by adapting wing lift distribution, morphing winglets are capable to improve aircraft aerodynamic efficiency in off-design conditions and reduce wing loads at critical flight points. For those reasons, it is expected that these devices will be applied to the aircraft of the very next generation. In the study herein presented, a preliminary failure analysis and structural design of a morphing winglet are presented. The research is collocated within the Clean Sky 2 Regional Aircraft IADP, a large European programme targeting the development of novel technologies for the next generation regional aircraft. The safety-driven design of the proposed kinematic system includes a thorough examination of the potential hazards associated with the system faults, by taking into account the overall operating environment and functions. The mechanical system is characterized by movable surfaces sustained by a winglet skeleton and completely integrated with a devoted actuation system. Such a load control device requires sufficient operational reliability to operate on the applicable flight load envelope in order to match the needs of the structural design. One of the most critical failure modes is assessed to get key requirements for the system architecture consistency. Possible impacts of the defined morphing outline on the FHA analysis are investigated. The structural design process is then addressed in compliance with the demanding requirements posed by the implementation on regional airplanes. The layout static robustness is verified by means of linear stress analyses at the most critical conditions, including possible failure scenarios. Results focus on the assessment of the device static and dynamic structural response and the preliminary definition of the morphing system kinematics, including the integrated actuator system.

Early Age Behavior of Jointed Plain Concrete Pavement inside Tunnel

2020 ◽  
Vol 24 (4) ◽  
pp. 1159-1168
Author(s):  
Wuguang Lin ◽  
Joo Hyung Yi ◽  
Hyeon Sik Hwang ◽  
Christopher Jabonero ◽  
Sung Woo Ryu ◽  
...  
Keyword(s):  
Plain Concrete ◽  
Concrete Pavement ◽  
Early Age
Sign in / Sign up

Export Citation Format

Share Document