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Investigation of the Effects of Leaching on the Scaling Resistance of Concrete

Rosenqvist, Martin LU ; Hassanzadeh, Manouchehr LU ; Pham, Long-Wei and Terzic, Adnan (2014) XIII International Conference on Durability of Building Materials and Components, 2014 p.407-414
Abstract
Damage to the concrete surface can be observed at the waterline of hydraulic structures in fresh water bodies in cold climates. Gradual deterioration of the concrete surface leads to exposure of coarse aggregate. Superficial damage at the waterline is commonly assumed to be caused by drifting ice floes. However, deterioration of concrete at the waterline may also involve leaching and frost action. The objective of this study is to investigate if leaching of calcium compounds changes the surface properties of concrete in such an extent that the scaling resistance is reduced.

Specimens with water to cement ratio 0.62 and 0.54 were submerged in deionised water at +20 °C and pH 4 ± 0.1 in order to accelerate leaching of calcium... (More)
Damage to the concrete surface can be observed at the waterline of hydraulic structures in fresh water bodies in cold climates. Gradual deterioration of the concrete surface leads to exposure of coarse aggregate. Superficial damage at the waterline is commonly assumed to be caused by drifting ice floes. However, deterioration of concrete at the waterline may also involve leaching and frost action. The objective of this study is to investigate if leaching of calcium compounds changes the surface properties of concrete in such an extent that the scaling resistance is reduced.

Specimens with water to cement ratio 0.62 and 0.54 were submerged in deionised water at +20 °C and pH 4 ± 0.1 in order to accelerate leaching of calcium compounds. The scaling resistance of concrete was assessed according to the Swedish test method SS 13 72 44. The results show that the scaling resistance of concrete is reduced if calcium compounds have been leached out from the surface. The results also show that the longer the time of leaching, the greater the reduction in scaling resistance. Superficial damage at the waterline of hydraulic structures in fresh water bodies in cold climates is most likely caused by interaction between leaching, frost action and abrasion. (Less)
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author
organization
publishing date
type
Contribution to conference
publication status
published
subject
keywords
Concrete, Leaching, Scaling resistance, Freeze-thaw cycles, Hydraulic structures
pages
8 pages
conference name
XIII International Conference on Durability of Building Materials and Components, 2014
language
English
LU publication?
yes
id
aa5e664a-f1a6-480b-bd65-0e41cd02a289 (old id 4647596)
date added to LUP
2014-09-17 18:05:24
date last changed
2016-04-16 12:03:54
@misc{aa5e664a-f1a6-480b-bd65-0e41cd02a289,
  abstract     = {Damage to the concrete surface can be observed at the waterline of hydraulic structures in fresh water bodies in cold climates. Gradual deterioration of the concrete surface leads to exposure of coarse aggregate. Superficial damage at the waterline is commonly assumed to be caused by drifting ice floes. However, deterioration of concrete at the waterline may also involve leaching and frost action. The objective of this study is to investigate if leaching of calcium compounds changes the surface properties of concrete in such an extent that the scaling resistance is reduced.<br/><br>
Specimens with water to cement ratio 0.62 and 0.54 were submerged in deionised water at +20 °C and pH 4 ± 0.1 in order to accelerate leaching of calcium compounds. The scaling resistance of concrete was assessed according to the Swedish test method SS 13 72 44. The results show that the scaling resistance of concrete is reduced if calcium compounds have been leached out from the surface. The results also show that the longer the time of leaching, the greater the reduction in scaling resistance. Superficial damage at the waterline of hydraulic structures in fresh water bodies in cold climates is most likely caused by interaction between leaching, frost action and abrasion.},
  author       = {Rosenqvist, Martin and Hassanzadeh, Manouchehr and Pham, Long-Wei and Terzic, Adnan},
  keyword      = {Concrete,Leaching,Scaling resistance,Freeze-thaw cycles,Hydraulic structures},
  language     = {eng},
  pages        = {407--414},
  title        = {Investigation of the Effects of Leaching on the Scaling Resistance of Concrete},
  year         = {2014},
}