Geotechnical Engineering

Freeze-Thaw Durability and Long-Term Performance Evaluation of Shotcrete in Cold Regions

In recent years, some states have replaced cast-in-place (CIP) concrete with shotcrete for structural earth retaining components such as fascia walls. Shotcrete also has the potential to be a solution for traditional reinforced concrete retaining walls—if it shows economic benefits and good long-term performance. This study’s aim was to evaluate the freeze-thaw durability of shotcrete in cold regions and to develop better ways to predict its long-term performance.

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Benchmarking and Safety Assessment for Modified Lateral Spreading Design Procedure Using Three-Dimensional Nonlinear Finite Element Analysis

Liquefaction-induced lateral spreading is a critical design consideration for many bridges in highly seismic regions of the Pacific Northwest, with broad impacts on safety for the general public. The current design procedures used to estimate liquefaction-induced lateral spreading in bridge-foundation-soil systems are often overly conservative, with the result that the construction of bridges may be more costly than necessary. This project sought to verify the current modified simplified design procedure and to develop a database and benchmarking framework useful for future evaluations.

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Best Practices of Using Shotcrete for Wall Fascia and Slope Stabilization, Phase I Study

Shotcrete, concrete applied pneumatically at high velocity, has become attractive because of its potential for saving cost and construction time when used to replace cast-in-place (CIP) concrete for retaining walls and slope stabilization. However, it also has potential drawbacks that raise concerns about its durability. This project was a first-phase effort in determining the best practices for using shotcrete for wall fascia built with soil nails and soldier piles. With the increasing desire of highway agencies to use shotcrete to save time and money, such information will be helpful to them in achieving the best structural quality and durability.

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