Please wait.'

Page is loading'


Home  > Raw materials & technologies  > Applications  > Macroscopic ice lens growth in hardened co...

Thursday, 18 July 2019
pdf
Raw materials & technologies, Applications

Macroscopic ice lens growth in hardened concrete

Thursday, 14 July 2016

Spalling of concrete has been observed by Swedish researchers in water retaining concrete structures exposed to long periods of freezing weather.

Macroscopic ice lens growth in hardened concrete. Source: Cat/Fotolia.com

Macroscopic ice lens growth in hardened concrete. Source: Cat/Fotolia.com

A hypothesis is that poor quality concrete, inadequate compaction or aging make hardened concrete susceptible to macroscopic ice lens growth, i.e. ice segregation.

Simulating winter conditions

To simulate winter conditions, the top surface of concrete specimens was subjected to freezing, whereas the bottom surface was submerged in heated water. Given constant thermal conditions, ice segregation occurred in sound concrete with w/c-ratio 0.9 and higher. In concrete with internal frost damage, ice segregation occurred within a few days regardless of the w/c-ratio. Ice segregation also occurred in specimens with paper sheets cast into the concrete to form cavities. However, the period of freezing required to facilitate ice segregation increased with decreasing w/c-ratio. The risk of macroscopic ice lens growth in actual structures cannot be overlooked since unfavourable temperature and moisture conditions may exist in winter.

The study is published in: Cement and Concrete Research, Volume 88, October 2016, Pages 114–125

top of page
Comments (0)
Add Comment

Post comment

You are not logged in

register