Performance Trends for Portland Cement Concrète General Aviation Pavements in Illinois

1996 ◽  
Vol 1524 (1) ◽  
pp. 194-202 ◽  
Author(s):  
Thomas Van Dam ◽  
James Bildilli
Keyword(s):  
Portland Cement ◽  
Element Model ◽  
General Aviation ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Actual Performance ◽  
Deterioration Rate ◽  
Performance Trends ◽  
And Performance ◽  
The Impact

The deterioration and performance of portland cement concrete general aviation (GA) airport pavements in Illinois are discussed. Two popular design procedures are reviewed, and typical GA pavement sections are structurally evaluated by using the ILLI-SLAB finite-element model. Subjected to GA pavement loading conditions, 125- and 150-mm-thick slabs would be considered structurally adequate, whereas 100-mm-thick slabs would not be expected to perform well. It was determined that slab size, as determined by the ratio of the slab length over the radius of relative stiffness (L/ l) was strongly correlated to pavement distress and performance. As the slab size was increased higher incidences of distress at higher severity levels were observed. Performance trends were identified by using a deterioration rate approach that accounts for the performance of individual sections. It is believed that this procedure reflects actual performance trends by addressing the issues of long-lived pavement sections, the impact of maintenance, and the influence of inspection variability.

Quality Control of Portland Cement Concrete Slabs with Wave Propagation Techniques

1996 ◽  
Vol 1544 (1) ◽  
pp. 91-98
Author(s):  
Soheil Nazarian ◽  
Deren Yuan ◽  
Mark R. Baker
Keyword(s):  
Quality Control ◽  
Wave Propagation ◽  
Surface Wave ◽  
Portland Cement ◽  
Body Wave ◽  
Field Testing ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Impact Echo ◽  
The Impact

Coring is normally done to monitor the thickness and quality of portland cement concrete (PCC) slabs during construction. Because this procedure requires a considerable amount of time, it is done at widely spaced intervals. As a result, the most critical points, in terms of strength or thickness, are sometimes not tested. Their repeatability and extreme sensitivity to the properties of surface layer enable wave propagation techniques to be used for quality control. The main advantage of these techniques is that they are nondestructive. Fortunately, these techniques have been automated in the last few years. Two seismic devices (seismic pavement analyzer and a portable version of it called the Lunch Box) have been used extensively for quality control. With them, slabs can be tested at closely spaced points and at a fraction of the cost and time of coring. The main tests used are the impact echo for determining the thickness of the slab, the ultrasonic body wave for determining the modulus, and the ultrasonic surface wave (an offshoot of the spectral analysis of surface waves method) also for determining the modulus. On the basis of extensive field testing on many types of base and subgrade, the techniques in general—and the two devices in particular—are suitable for many quality-control projects. It was found that the most robust method for determining the modulus is the ultrasonic surface wave. The impact echo also works well, as long as enough contrast exists between the properties of the PCC and the underlying materials.

scholarly journals Long-term use of modern Portland cement concrete: The impact of Al-tobermorite formation

2021 ◽  
Vol 198 ◽  
pp. 109297
Author(s):  
Ippei Maruyama ◽  
Jiří Rymeš ◽  
Abudushalamu Aili ◽  
Shohei Sawada ◽  
Osamu Kontani ◽  
...  
Keyword(s):  
Portland Cement ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
The Impact

Analysis of the Impact of Cracking Old Portland Cement Concrete Pavement to Underground Pipe

2011 ◽  
Vol 255-260 ◽  
pp. 3150-3155
Author(s):  
Ping Li ◽  
Chen He ◽  
Gui Xian Wu ◽  
Xiu Li Wang
Keyword(s):  
Element Model ◽  
Additional Stress ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Soil Pressure ◽  
3D Finite Element ◽  
Underground Pipe ◽  
Cement Concrete Pavement ◽  
Vertical Displacements ◽  
The Impact

Impacting and compacting technology is widely applied for re-built old PCC pavement. However, underground pipe would be influenced by impacting machine to possibly occur fracture. A 3D finite element model was established by ADINA software to analyze distribution of additional stress and displacement upon pipe when machine traveled across different positions of slab. The results indicated that longitudinal compressive stress and vertical displacements at the corner of the slab were larger than those at the longitudinal middle fringe of the slab; the influenced depth of additional stress caused by impacting force was about 2.5m and additional stress decayed quickly with the increasing depth; the maximum soil pressure measured in field was smaller than that in numerical simulation.

Strength Studies of High Performance Concrete with Fly-Ash and Gangue

2012 ◽  
Vol 446-449 ◽  
pp. 3544-3553
Author(s):  
Yun Fang Meng ◽  
Ya Yun Tan ◽  
Rui Li
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Silica Fume ◽  
High Performance ◽  
High Performance Concrete ◽  
Supplementary Cementitious Materials ◽  
Optimum Level ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
And Performance

The main purpose of this research was to enhance the strength and durability of concrete in both design and construction of high performance concrete. Particularly, the strength in high performance concrete is achieved by optimising the gangue, fly ash and silica fume replacement for cement. The gangue has been used as a cementitious material. Using data from tests on laboratory studies, comparisons are made of the properties and performance of the gangue, fly ash and silica fume concrete with conventional Portland cement concrete of similar and same mixture proportions. The many technical benefits available to high performance concrete user, such as reduced heat evolution, lower permeability and higher strength at later ages, at the same time, in order to increase resistance to sulphate attack and alkali silica reaction. A number of recommendations are given for the effective use of gangue and fly ash in high performance concrete. The results show that 10% gangue, 15% slag, 15% fly ash, 10% silica fume of replacement was found to be an optimum level and demonstrated excellent performance in strength. Literature review on the use of different supplementary cementitious materials in concrete to enhance strength was also reported. The paper is intended to provide guidance for those concerned with the design, application and performance of high properties concrete in practice where gangue and fly ash can also help to reduce costs and energy demands in the production of concrete compared with conventional Portland cement concrete.

Changing the Shape and Location of Pavement Load Transfer Devices

2005 ◽  
Vol 1907 (1) ◽  
pp. 95-101
Author(s):  
James K. Cable
Keyword(s):  
Experimental Design ◽  
Portland Cement ◽  
Load Transfer ◽  
Field Research ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Research Project ◽  
Joint Design ◽  
The Impact ◽  
Initial Results

Load transfer is an important aspect of portland cement concrete joint design. To date, aggregate interlock and round steel dowels have been used to accomplish load transfer. Research was done to examine the use of steel dowels of alternative shapes to provide load transfer. A field research project in Iowa has used two elliptical bars of different sizes at three spacings and numbers of bars per joint. Test sections included bars across the entire joint and sections using bars only in the wheelpaths. The impact of cut, fill, and transition sections was also factored into the experimental design. This paper documents the construction of the project, testing that is being done, and the initial results of the work.

scholarly journals Mechanistic Responses of Asphalt Concrete Overlay Over Jointed Plain Concrete Pavement Using Finite Element Method

2020 ◽  
Vol 15 (5) ◽  
pp. 80-93
Author(s):  
Amadou Oury Diallo ◽  
Muhammet Vefa Akpinar
Keyword(s):  
Finite Element ◽  
Portland Cement ◽  
Asphalt Concrete ◽  
Tensile Strain ◽  
Plain Concrete ◽  
Element Model ◽  
Concrete Pavement ◽  
Traffic Load ◽  
Portland Cement Concrete ◽  
Cement Concrete

This study focused on the development of a three-dimensional Finite Element Model of an asphalt concrete overlaid on a jointed plain concrete pavement to assess the mechanical behaviour of the pavement under traffic load. The objective of this study was to determine the influence of different asphalt concrete thickness, asphalt concrete modulus, the interface bond between the asphalt concrete and the Portland cement concrete layer, Portland cement concrete modulus, and joint width on the tensile strain at the bottom of the asphalt overlay. The results showed that changes in the pavement parameters result in a large range of variations on the magnitude of pavement responses. The magnitude of the longitudinal tensile strain at the bottom of the overlay varied between 25 με and 460 με. Asphalt concrete thickness, interface contact condition, and asphalt concrete modulus parameters had the most influence on the pavement responses. The interface bonding condition was significant, regardless of the thickness of the surface layer.

Development of a Capacitor Probe to Detect Subsurface Deterioration in Concrete

1997 ◽  
Vol 503 ◽  
Author(s):  
B. K. Diefenderfer ◽  
I. L. Al-Qadi ◽  
J. J. Yoho ◽  
S. M. Riad ◽  
A. Loulizi
Keyword(s):  
Dielectric Constant ◽  
Portland Cement ◽  
Electromagnetic Waves ◽  
Low Cost ◽  
Complex Dielectric Constant ◽  
Life Cycle Costs ◽  
Parallel Plates ◽  
Portland Cement Concrete ◽  
Cement Concrete ◽  
Set Up

ABSTRACTPortland cement concrete (PCC) structures deteriorate with age and need to be maintained or replaced. Early detection of deterioration in PCC (e.g., alkali-silica reaction, freeze/thaw damage, or chloride presence) can lead to significant reductions in maintenance costs. However, it is often too late to perform low-cost preventative maintenance by the time deterioration becomes evident. By developing techniques that would enable civil engineers to evaluate PCC structures and detect deterioration at early stages (without causing further damage), optimization of life-cycle costs of the constructed facility and minimization of disturbance to the facility users can be achieved.Nondestructive evaluation (NDE) methods are potentially one of the most useful techniques ever developed for assessing constructed facilities. They are noninvasive and can be performed rapidly. Portland cement concrete can be nondestructively evaluated by electrically characterizing its complex dielectric constant. The real part of the dielectric constant depicts the velocity of electromagnetic waves in PCC. The imaginary part, termed the “loss factor,” describes the conductivity of PCC and the attenuation of electromagnetic waves.Dielectric properties of PCC have been investigated in a laboratory setting using a parallel plate capacitor operating in the frequency range of 0.1 to 40.1MIHz. This capacitor set-up consists of two horizontal-parallel plates with an adjustable separation for insertion of a dielectric specimen (PCC). While useful in research, this approach is not practical for field implementation. A new capacitor probe has been developed which consists of two plates, located within the same horizontal plane, for placement upon the specimen to be tested. Preliminary results show that this technique is feasible and results are promising; further testing and evaluation is currently underway.

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