ASCE will be sunsetting the Civil Engineering Database (CEDB) in the coming months. We encourage you to start using the ASCE Library to perform content searches. In the ASCE Library, you can save your search results as well as receive email content alerts when new content relevant to your area of interest is published. Try it out today at https://ascelibrary.org.

 

Effect of Fly Ash on the Microstructure and Durability of Concrete

by K. W. Nasser, Univ of Saskatchewan, Canada,
P. S. H. Lai, Univ of Saskatchewan, Canada,



Document Type: Proceeding Paper

Part of: Serviceability and Durability of Construction Materials

Abstract:

The influence of fly ash on the microstructure and durability of concrete was investigated. It was found that the use of 50% fly ash in concrete reduced greatly its resistance to freezing-and-thawing even though the concrete was well cured and contained an adequate amount of air. On the other hand, the same concrete showed better resistance to sulfate attack. Results from the SEM examination indicated that the decrease in the resistance to freezing-and-thawing might be due to migration of the microcrystalline Ca(OH)₂ and fibrous ettringite from the dense C-S-H zone to the air voids during cycling. However, the improvement in the sulfate resistance might be due to the reduced amount of ettringite in fly ash concrete.

Subject Headings: Load and resistance factor design | Fly ash | Concrete | Sulfates | Microstructure | Freeze and thaw | Material tests

Services: Buy this book/Buy this article

 

Return to search