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Freeze-Thaw Resistance of Concrete with Marginal Air Content

COURSE NO: C03-044
Freeze-Thaw Resistance of Concrete with Marginal Air Content
Course Highlights

This online engineering PDH course describes a laboratory investigation of the behavior of concrete with "marginal" air void systems, in which the air content and other air void system parameters do not consistently meet commonly accepted thresholds for freeze-thaw durability.


The air content of concrete is a factor in the concrete's durability that may also affect the service life of concrete beams, concrete pavement, etc. During the freeze-thaw cycle the air voids in concrete expand and contract. This physical cycle may lead to microcracking in the concrete. It is recommended that the air void system of concrete contain approximately 6 percent total air and a spacing factor less than 0.20 millimeters. It was observed however in laboratory studies that some concretes exhibited good freeze-thaw resistance with an air content and spacing factor outside of the accepted thresholds.


This 3 PDH online course is applicable to civil, geotechnical, transportation and environmental engineers, as well as all other professionals involved in the planning and construction of both concrete pavements and structures built in climates with below-freezing temperatures. This course will also be of interest to concrete researchers studying the factors affecting concrete durability.

Learning Objectives

This PE continuing education course is intended to provide you with the following specific knowledge and skills:

  • Ability to compare the performance of Vinsol resin and synthetic air-entraining admixtures
  • Understanding the difference between entrapped air and entrained air
  • Learning about the effects of microcracks in concrete
  • Learning about freezing temperature of water in concrete gel
  • Learning about the effects of air voids on the freeze-thaw cycles in concrete
Course Document

In this professional engineering CEU course, you need to review the Federal Highway Administration Publication FHWA-HRT-06-117, "Freeze-Thaw Resistance of Concrete with Marginal Air Content", published December 2006.

To view, print and study the course document, please click on the following link(s):
Freeze-Thaw Resistance of Concrete with Marginal Air Content (4.4 MB)
Course Quiz
Once you complete your course review, you need to take a multiple-choice quiz consisting of fifteen (15) questions to earn 3 PDH credits. The quiz will be based on this FHWA Publication.


The minimum passing score is 70%. There is no time limit on the quiz, and you can take it multiple times until you pass at no additional cost.
Certificate of Completion

Upon successful completion of the quiz, print your Certificate of Completion instantly. (Note: if you are paying by check or money order, you will be able to print it after we receive your payment.) For your convenience, we will also email it to you. Please note that you can log in to your account at any time to access and print your Certificate of Completion.

To buy the course and take the quiz, please click on: