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Degraded concrete and rusted, exposed reinforcement bar (rebar) on Welland River bridge of the Queen Elizabeth Way in Niagara Falls, Ontario. Concrete degradation may have many different causes. Concrete is mostly damaged by the corrosion of reinforcement bars due to the carbonatation of hardened cement paste or chloride attack under wet ...
On the other hand, for completely dry concrete, the chemical reaction of carbonation cannot occur. Another influencing factor for CO 2 diffusion rate is concrete porosity. Concrete obtained with higher w/c ratio or obtained with an incorrect curing process presents higher porosity at hardened state, and is therefore subjected to a higher ...
Concrete degradation; S. Sulfate attack in concrete and mortar This page was last edited on 29 September 2024, at 15:37 (UTC). Text is available under the Creative ...
The roof, made from concrete slabs, is corrugated for rigidity and cantilevers over the main entrance. A suspended structure was affixed to this extending portion of the roof using steel tension elements. This structure mainly consisted of massive reinforced concrete beams that overhung the entrance to act as a canopy.
The Revised Statutes of Ontario (RSO; Quebec French: Lois refondues de l'Ontario, LRO) is the name of several consolidations of public acts in the Canadian province of Ontario, promulgated approximately decennially from 1877 to 1990.
Oxide jacking has caused concrete spalling on walls of the Herbst Pavilion at Fort Mason Center in San Francisco. The expansive force of rusting, which may be called oxide jacking or rust burst, is a phenomenon that can cause damage to structures made of stone, masonry, concrete or ceramics, and reinforced with metal components.
As of July 1, 2012 the Ontario Building Code was amended to address the issue of balcony glass breaking on newly constructed buildings. [30] The new amendment, Supplementary Standard SB-13, "Glass in Guards" [ 31 ] is intended to help minimize the likelihood that balcony glass will break on newly constructed buildings and help reduce the chance ...
A fairly well-defined reaction front can often be observed in thin sections; ahead of the front the concrete is normal, or near normal. Behind the reaction front, the composition and the microstructure of concrete are modified. These changes may vary in type or severity but commonly include: Extensive cracking; Expansion