Applicatons of Hydration Thermodynamics to In-Situ Test Results

1993 ◽  
Vol 333 ◽  
Author(s):  
M. J. Plodinec ◽  
G. G. Wicks
Keyword(s):  
Laboratory Tests ◽  
Glass Production ◽  
Natural Environments ◽  
Test Results ◽  
In Situ Tests ◽  
Important Conclusion ◽  
In Situ Test ◽  
Long Term Performance ◽  
Term Performance

ABSTRACTAn extremely important question for the eventual disposal of glass in natural environments is the relevance of laboratory testing of glass durability to the long-term performance of glass in geologic environments. The purpose of this study was to attempt to provide an empirical answer to that question, by applying the hydration thermodynamics approach (which has successfully been applied to laboratory tests of glass durability) to the results of longer-term testing in natural environments.The results show that hydration thermodynamics is a useful tool for explaining the effects of glass composition observed in in-situ tests, in several environments. Thus, it appears to provide a link between laboratory tests of glass durability and the results of in-situ tests in natural environments. Perhaps the most important conclusion of this effort is that the in-situ test results emphasize the importance of control of chemical composition during glass production as a means of achieving a durable glass.

The Use of Laboratory-Measured and Strain-Gauge Backcalculated Asphalt Stiffness for Rutting Performance Prediction

2019 ◽  
Vol 2673 (3) ◽  
pp. 323-333
Author(s):  
Erdem Coleri ◽  
John T. Harvey
Keyword(s):  
Performance Prediction ◽  
Strain Gauge ◽  
Asphalt Concrete ◽  
Laboratory Tests ◽  
Concrete Materials ◽  
Long Term Performance ◽  
Term Performance ◽  
The Impact

Laboratory tests are conducted with asphalt concrete materials to determine the expected in-situ performance. In addition, laboratory test results are commonly used in mechanistic-empirical design methods for material characterization to improve the predictive accuracy of the models. However, the effectiveness of laboratory tests in characterizing the long-term performance of asphalt concrete materials needs to be validated to be able to use the results for pavement design and long-term performance prediction. Inaccurate performance characterization and prediction can directly affect the decision-making process for pavement maintenance, rehabilitation, and reconstruction and result in unexpected early failures in the field. The major objective of this study is to determine the impact of using laboratory-measured asphalt stiffness on the prediction accuracy of mechanistic-empirical models. In addition, the effect of using linear-elastic modeling assumptions (layered elastic theory) and neglecting the nonlinearity of pavement response at high load levels (and/or at high strain levels for weaker structures) on the predicted rutting performance was determined. In this study, the effectiveness of the use of laboratory asphalt stiffness tests for in-situ asphalt stiffness characterization was determined by comparing the rutting performance predicted using laboratory-measured stiffness to rutting predicted using strain-gauge backcalculated stiffness. It was determined that laboratory tests are able to characterize the in-situ stiffness characteristics of the asphalt mix used in this study and the stiffness characterization process suggested in this study can provide reliable rutting performance predictions. Results of this study are only applicable to tested rubberized asphalt concrete mixtures.

scholarly journals Testing the rocks loosening process by undercutting anchors

2020 ◽  
Vol 42 (3) ◽  
pp. 276-290
Author(s):  
Michał Siegmund ◽  
Marek Kalita ◽  
Domink Bałaga ◽  
Krzysztof Kaczmarczyk ◽  
Jonak Józef
Keyword(s):  
Load Capacity ◽  
List Type ◽  
Test Results ◽  
Capacity Design ◽  
In Situ Tests ◽  
In Situ Test ◽  
Modeling Process ◽  
Science Centre ◽  
National Science

AbstractThe method of unconventional solid rock loosening with undercutting anchors and the literature analysis of the problem are presented. The tests and test results of the rocks loosening process with a fixed undercutting anchor are described. The tests were carried out within the RODEST project, OPUS 10 competition No. 2015/19/B/ST10/02817, financed by the National Science Centre. Numerical modeling process as well as a series of laboratory and in situ tests were carried out. The test stand equipment and methodology for the in situ tests are presented. The tests were conducted in four mines, which allowed to obtain and determine the following characteristics: loosening force as a function of anchoring depth (for a given type of rock),the range of rock loosening in a function of anchoring depth (for a given type of rock), andloosened rock volume as a function of anchoring depth (for a given type of rock).The in situ test results are compared with the concrete capacity design (CCD) model used for the calculation of anchor load capacity in concrete.

Geochemical and microbial reactions affecting the long-term performance of in situ ‘iron barriers’

2000 ◽  
Vol 4 (4) ◽  
pp. 273-286 ◽  
Author(s):  
Liyuan Liang ◽  
Nic Korte ◽  
Baohua Gu ◽  
Robert Puls ◽  
Charles Reeter
Keyword(s):  
Long Term Performance ◽  
Term Performance

Long Term Performance of Fusion Bond Epoxy Coated Pipelines

2004 ◽  
Author(s):  
Robert Worthingham ◽  
Matt Cetiner
Keyword(s):  
Service Life ◽  
Cathodic Protection ◽  
Laboratory Tests ◽  
Large Diameter ◽  
Service Temperature ◽  
Line Pipe ◽  
Coating Type ◽  
Long Term Performance ◽  
Term Performance

TransCanada Pipelines has been using fusion bond epoxy (FBE) external coatings for large diameter line pipe since the early 1980’s. Overall, this coating type, when applied in accordance to the CSA Z245.20 standard provides excellent protection and long term service life. However, some reports from the field described the periodic occurrence of blistering and disbondment of the coating. In order to understand the magnitude and causes of these phenomena, an investigative program was initiated. Laboratory tests and a program of field examinations were carried out. Some of the variables considered were: age of the coating; service temperature; cathodic protection (CP) levels; and soil type. No evidence of a pipeline integrity threat associated with fusion bond epoxy deterioration was found at any of the locations examined. Observations and correlations of coating to exposure conditions will be presented.

scholarly journals Dilation of Ti-6Al-4V/HA Composite Tensile Parts

2002 ◽  
Vol 11 (2) ◽  
pp. 096369350201100
Author(s):  
E. S. Thian ◽  
N. H. Loh ◽  
K. A. Khor ◽  
S. B. Tor
Keyword(s):  
Heating Rate ◽  
Sintering Temperature ◽  
Holding Time ◽  
Test Results ◽  
Basic Information ◽  
Sintering Process ◽  
Densification Rate ◽  
In Situ Test ◽  
Temperature Heating

Prior to the actual sintering process, a dilatometry study is performed to provide basic information and guidelines. This paper studies the effects of three sintering factors: sintering temperature, heating rate and holding time, on the densification rate of Ti-6Al-4V/HA composite parts. According to the in-situ test results, suitable values for the sintering factors can then be established.

Benchmarking of VIV Suppression Systems

2008 ◽  
Author(s):  
Kenneth J. Schaudt ◽  
Christopher Wajnikonis ◽  
Don Spencer ◽  
Jie Xu ◽  
Steve Leverette ◽  
...  
Keyword(s):  
Reynolds Number ◽  
The Body ◽  
Test Results ◽  
In Situ Tests ◽  
Image Velocimetry ◽  
High Reynolds ◽  
Viv Suppression ◽  
Almost All ◽  
Flow Splitter

A new form of Vortex-Induced Vibration (VIV) suppression device, the AIMS Dual-fin Flow Splitter (ADFS), has been developed, tested and benchmarked against bare-pipe, 5d and 15d pitch strakes and conventional teardrop fairings. Testing included high-mode number in-situ tests as well as low Reynolds number (<300,000) and high Reynolds number (<1.9 million) forced and free tank tests. Finally, wind tunnel tests and in-water Particle Image Velocimetry (PIV) were used to test the hypothesis that the dual-fin flow splitter replaces the oscillating wake of a blunt body with a stable, attached circulation behind the body and between the fins. Such a replacement was hypothesized to result in reduced drag, and the elimination of almost all VIV. The paper will describe the testing program and results, and present the incorporation of the test results into riser models.

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