Analysis on Void Beneath Curling Slab in Rigid Base Cement Concrete Pavement and Fatigue Life Prediction

2012 ◽  
Vol 204-208 ◽  
pp. 1782-1788 ◽  
Author(s):  
Qing Zhang ◽  
Yun Chen Sun ◽  
Jing Jing Li
Keyword(s):  
Fatigue Life ◽  
Temperature Gradient ◽  
Service Life ◽  
Life Prediction ◽  
Concrete Pavement ◽  
Fatigue Life Prediction ◽  
Rigid Base ◽  
Cement Concrete ◽  
Cement Concrete Pavement ◽  
Fatigue Life Analysis

The damages in two rigid base cement concrete pavement were investigated. The data analysis suggests that the void beneath curling slab resulting from the temperature gradient changing leads to pavement damages. With the benefit of the pavement curling structure numerical model established in this article, the void changing law beneath curling slab and loading stress were analyzed. The loading stress level increases dramatically due to void occurring beneath curling slab. The calculation method of loading stress in the curling slab was given. The fatigue life analysis further reveals that the void beneath curling slab caused by temperature gradient changes is the fundamental reason for the decreasing of the service life of cement concrete pavement. The service life of investigating section were predicted and analyzed according to the fatigue life prediction model established in this article and the survey data.

Influences on the Axle Load Stress of the Cement-Concrete Pavement Structure Caused by the Crack or Cutting Crack of the Semi-Rigid Base

2013 ◽  
Vol 857 ◽  
pp. 200-203
Author(s):  
Bin Yang ◽  
Hua Tan ◽  
Jia Xi Deng ◽  
Chan Pang
Keyword(s):  
Working Conditions ◽  
Crack Width ◽  
Concrete Pavement ◽  
Rigid Base ◽  
Cement Concrete ◽  
3D Fem ◽  
Cement Concrete Pavement ◽  
Dry Shrinkage ◽  
Pavement Structure ◽  
The One

Some horizontal cracks will appear during the strength formation of the semi-rigid base, for the influences of dry shrinkage and temperature shrinkage exist, so the engineers often adopt the manual method of equidistant cutting crack to avoid the irregular cracks. In order to analyse the influences on the axle load stress of the cement-concrete pavement slab which caused by the width and position of the base cracks or cutting cracks, the 3D FEM was used to study them under the different working conditions considering the crack, width and position. By the above research, the results show the existing cracks affect the integrity and continuity of the pavement structure; The crack width has no large influence on the stress of the pavement slab, while the base stress decreases apparently with the increasing width, and it becomes stable finally; The stress of the pavement slab is maximum when the crack or cutting crack is located in the middle, while it's small when the crack or cutting crack is located in the one fourth of the pavement slab.

Research of Zero Stress Temperature Gradient in Cement Concrete Pavement

2013 ◽  
Vol 723 ◽  
pp. 163-170 ◽  
Author(s):  
Xiang Shen Hou ◽  
Xin Kai Li ◽  
Bo Peng ◽  
Guang Hui Deng
Keyword(s):  
Temperature Gradient ◽  
Concrete Beam ◽  
Concrete Slab ◽  
Strain Sensor ◽  
Concrete Pavement ◽  
Early Age ◽  
Cement Concrete ◽  
Setting Process ◽  
Cement Concrete Pavement ◽  
Design Guidance

There is no temperature stress and temperature curling according to the present cement concrete pavement design, when the temperature gradient of cement concrete pavement in service is zero, and it does not consider the effect of Built-in curling caused in early-age setting process of cement concrete to cement concrete pavement in service. In fact, there is Built-in curling in cement concrete slab when it is after the completion of the cement concrete slab is poured, and the curling is mainly upward. It is in the setting process, when cement concrete is on the final set, the cement concrete is at the critical moment when is just able to bear load, and it exists temperature gradient but no strain in the pavement slab, the temperature gradient is known as "Built-in construction temperature gradient" in AASHTO2002 design guidance, and it is the important part of the Built-in curling. In this paper, cement concrete beam specimens were poured in outdoor and temperature sensor and strain sensor were buried in the cement concrete specimens to detect early-age internal temperature field and strain field, and then the study of Built-in curling and Built-in construction temperature gradient were carried out.

Numerical Analysis of Joint Opening Displacement for Cement Concrete Pavement under Temperature Gradient

2011 ◽  
Vol 255-260 ◽  
pp. 3200-3204
Author(s):  
Jing Jing Li ◽  
Zhan Feng Wang ◽  
Qing Zhang
Keyword(s):  
Temperature Gradient ◽  
Concrete Pavement ◽  
Slab Thickness ◽  
Cement Concrete ◽  
Opening Displacement ◽  
Joint Opening ◽  
Cement Concrete Pavement ◽  
Set Up ◽  
One Year ◽  
Theoretical Results

In order to analyze the changes of joint opening displacement(JOD) for cement concrete pavement under different road structures and material parameters, the joint model is derived and presented. The model takes into account conservation of various factors, the results have shown that JOD is significantly effected by temperature gradient, base modulus, slab length and slab thickness, and then the formula of joint changes have been set up with the consideration of four main factors. According to theoretical results, three different base types about lean concrete, cement stabilized macadam and graded broken stone have on-site observation of JOD for one year in Guangxi, and the above formula is verified, which provides the potential for the joint design and selecting the joint filler.

Performance and Application of Sampave Overlaying on Old Cement Concrete Pavement

2011 ◽  
Vol 255-260 ◽  
pp. 3223-3227
Author(s):  
Ming Liang Xing ◽  
Shuan Fa Chen ◽  
Zu Zhong Li ◽  
Hua Xin Chen ◽  
Bing Gang Wang
Keyword(s):  
Fatigue Life ◽  
Low Temperature ◽  
Creep Test ◽  
Asphalt Mixture ◽  
Concrete Pavement ◽  
Cement Concrete ◽  
Good Ability ◽  
Cement Concrete Pavement ◽  
And Performance ◽  
Better Than

How to prevent and delay the emergence of reflective cracks effectively is a most important task for road researchers to the asphalt mixture overlaid on the old cement concrete pavement. Several methods preventing reflective cracks prevention have been used before, but few are satisfied. In this paper Sampave is put forward as a new method or structure which is better than the others. Base on principle of reflective cracks, a new layer named Sampave was put forward. And this paper discusses its aspaht, gradation and performance. According to the requirement reasonable gradation is suggested for practice. By means of researching on materials performance in the lab, it is obviously that Sampave has good performance at low temperature. Results of bending and creep test indicate that Sampave has good ability in resisting deformation. Meanwhile the result of fatigue test indicates that the fatigue life of Sampave is more than 210 thousand, therefore it has good performance in anti-cracking, and also the results of application in the project show its advantages in resisting reflective cracks.

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