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Abbreviations:

AOP-Areas of Practice

LAR-Laws & Rules

P.E.-Professional Engineers

 

Explore all PDH CEU CPC CPD and Webinars for Engineers

Corrosion/Degradation of Soil Reinforcements for MSE Walls & Reinforced Soil Slopes

Course No. T-9001

Credit: 9 PDH

Course Fee: $239.90 Purchase course

Subject Matter Expert: Mark R. Knarr, P.E.

 

Overview

Mechanically stabilized earth (MSE) systems for the construction of retaining walls and steepened slopes has gained widespread acceptance among owners, as evidenced by the many thousands of completed structures. As usage increased in the 1980s and 1990s, there was, however, a desire by owners and the research community to confirm that current methods are valid and that the design models used will ensure that these structures will perform as intended for their full design life.

It is important to consider the performance of MSE structures within the context of Transportation Asset Management (TAM), as slopes and retaining walls are important components of the highway system. Their performance depends on proper selection of materials, details of construction and maintenance. These are important considerations and their impacts on cost and service life affect decisions inherent to TAM. The design of MSE structures requires that the combination of a select soil and reinforcement be such that the interaction between the two materials produces a composite structural material that combines their best characteristics. The judicious placement of reinforcements in the select soil mass serves to restrain the deformation of the soil in the direction parallel to the reinforcement.

The most commonly used soil-reinforcing for retaining walls on transportation projects has been galvanized steel connected to a precast concrete facing. Polymeric soil reinforcements were introduced in the 1970s and early 1980s, and have been used with increasing frequency in both MSE walls and reinforced soil slopes since their introduction. Today, the majority of RSS on transportation projects use geosynthetic soil reinforcements.

A major design concern for MSE structures has been the durability of reinforcements in the soil/water environment in which they are placed. Engineers need a guide to evaluate potential corrosion losses when using coated or uncoated steel reinforcements, and degradation losses when evaluating the use of polymeric reinforcements.

The target audience for this course is civil engineers who are interested in preservation of mechanically stabilized earth (MSE) systems, particularly those with galvanized steel or geosynthetic reinforcements. The course material is based on the Federal Highway Administration (FHWA) publication FHWA-NHI-09-087, November 2009.

To receive credit for this course, the student must pass a multiple-choice quiz consisting of forty-five (45) questions.

Specific Knowledge or Skill Obtained

This course teaches the following specific knowledge and skills:

  • Corrosion/deterioration mechanisms that occur in reinforced soil structures constructed with metallic reinforcements, leading to design procedure recommendations
  • Techniques and instrumentation designed to measure in-situ corrosion rates of steel reinforcements in MSE structures
  • Laboratory test methods for the electrochemical analysis of select reinforced fill materials used in MSE structures
  • Relationships between test variables and predictions of corrosion/degradation
  • Criteria to determine survivability of fusion bonded epoxy coatings
  • Degradation mechanisms consistent with in-ground regimes for geosynthetic reinforcements
  • Monitoring methods and evaluation of degradation mechanisms for geosynthetic reinforcements

Course

Click on the following link to the PDF document to review the course material before taking the quiz for credit.

Corrosion/Degradation of Soil Reinforcements for MSE Walls & Reinforced Soil Slopes

 

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