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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 ...
ASTM C1293: "Test Method for Concrete Aggregates by Determination of Length Change of Concrete Due to Alkali-Silica Reaction". It is a long-term confirmation test (1 or 2 years) at 38 °C in a water-saturated moist atmosphere (inside a thermostated oven) with concrete prisms containing the aggregates to be characterised mixed with a high-alkali ...
The Taylor-Massey Creek watershed exists entirely within an urban setting and has suffered severe degradation. The upper portion of the creek is encased almost entirely in concrete lined channels which increases the flow of the river and provides little habitat. Other sections are constrained by rock filled gabion baskets. The water is heavily ...
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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 ...
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.
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 ...
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
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