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Macroscopic ice lens growth in hardened concrete

Rosenqvist, Martin LU ; Fridh, Katja LU and Hassanzadeh, Manouchehr LU (2016) In Cement and Concrete Research 88. p.114-125
Abstract

Spalling of concrete has been observed in water retaining concrete structures exposed to long periods of freezing weather. A hypothesis is that poor quality concrete, inadequate compaction or aging make hardened concrete susceptible to macroscopic ice lens growth, i.e. ice segregation. 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... (More)

Spalling of concrete has been observed in water retaining concrete structures exposed to long periods of freezing weather. A hypothesis is that poor quality concrete, inadequate compaction or aging make hardened concrete susceptible to macroscopic ice lens growth, i.e. ice segregation. 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.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Concrete [E], Degradation [C], Fracture toughness [C], Long-term performance [C], Macroscopic ice lens growth
in
Cement and Concrete Research
volume
88
pages
12 pages
publisher
Elsevier
external identifiers
  • Scopus:84977275537
  • WOS:000382803300011
ISSN
0008-8846
DOI
10.1016/j.cemconres.2016.06.008
language
English
LU publication?
yes
id
eb0a1b0c-3548-45b9-aef5-b5c729c70bad
date added to LUP
2016-07-18 11:20:13
date last changed
2017-01-01 08:30:38
@article{eb0a1b0c-3548-45b9-aef5-b5c729c70bad,
  abstract     = {<p>Spalling of concrete has been observed in water retaining concrete structures exposed to long periods of freezing weather. A hypothesis is that poor quality concrete, inadequate compaction or aging make hardened concrete susceptible to macroscopic ice lens growth, i.e. ice segregation. 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.</p>},
  author       = {Rosenqvist, Martin and Fridh, Katja and Hassanzadeh, Manouchehr},
  issn         = {0008-8846},
  keyword      = {Concrete [E],Degradation [C],Fracture toughness [C],Long-term performance [C],Macroscopic ice lens growth},
  language     = {eng},
  month        = {10},
  pages        = {114--125},
  publisher    = {Elsevier},
  series       = {Cement and Concrete Research},
  title        = {Macroscopic ice lens growth in hardened concrete},
  url          = {http://dx.doi.org/10.1016/j.cemconres.2016.06.008},
  volume       = {88},
  year         = {2016},
}