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

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.

Long-Term Performance of In Situ Reactive Barriers for Nitrate Remediation

Ground Water ◽  
2000 ◽  
Vol 38 (5) ◽  
pp. 689-695 ◽  
Author(s):  
W.D. Robertson ◽  
D.W. Blowes ◽  
C.J. Ptacek ◽  
J.A. Cherry
Keyword(s):  
Reactive Barriers ◽  
Long Term Performance ◽  
Term Performance

scholarly journals Use of expanding polyurethane resin to remediate expansive soil foundations

2010 ◽  
Vol 47 (6) ◽  
pp. 623-634 ◽  
Author(s):  
Olivier Buzzi ◽  
Stephen Fityus ◽  
Scott W. Sloan
Keyword(s):  
Large Scale ◽  
Composite Resin ◽  
Expansive Soil ◽  
Soil Mass ◽  
Clay Material ◽  
Polyurethane Resin ◽  
Long Term Performance ◽  
Term Performance

Injection of expansive polyurethane resin can be used to remediate differential settlement issues. The resin is injected incrementally under a structure to achieve a desired foundation level, forming a composite resin–clay material. This solution is not well documented in the literature and some questions arise on the long-term performance of this solution. As injection is usually carried out in a settled soil mass that is dry and dessicated, rehydration of the soil after injection may lead to swelling of the leveled foundation and overlifting of the structure. Experimental research undertaken to investigate this rehydration issue and determine if there is a risk of overlifting in the long term is presented here. In situ and laboratory testing was performed to investigate the most fundamental aspects of the problems. This included the in situ injection of resin, study of resin propagation in the soil mass, influence of resin on the hydraulic conductivity of the soil mass, and large-scale swelling tests. The results suggest that, even though the resin cannot prevent the rehydration of the soil mass, the risk of overlifting in the long term is limited.

Long-Term Performance of an In Situ "Iron Wall" for Remediation of VOCs

Ground Water ◽  
1998 ◽  
Vol 36 (1) ◽  
pp. 164-170 ◽  
Author(s):  
Stephanie F. O'Hannesin ◽  
Robert W. Gillham
Keyword(s):  
Long Term Performance ◽  
Term Performance
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