What is it about?

This paper discusses the relationship between the entrained air content of concrete and the supplementary cementitious content. A model is proposed indicating the role of fluid absorption and the role of air.

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Why is it important?

AASHTO R101 sets limits on the calcium oxychloride that is permitted in a mixture. This paper shows that for mixtures with low SCM content air is insufficient to control the damage. It also shows that high SCM contents control damage irrespective of air content. In mixtures with moderate SCM contents, the air content can impact the critical calcium hydroxide or calcium oxychloride threshold.

Perspectives

The three most important aspects of the paper: 1) air content impacts the critical SCM content, 2) the absorption of fluid is critical for damage to develop, and 3) a computational approach is proposed to predict damage. This can impact AASHTO R101 and mixture design.

Professor William Jason Weiss
Oregon State University

Read the Original

This page is a summary of: The influence of air voids and fluid absorption on salt-induced calcium oxychloride damage, Cement and Concrete Composites, October 2022, Elsevier, DOI: 10.1016/j.cemconcomp.2022.104697.
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