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The formation of fissures in the concrete cover above the reinforcement bars represents a preferential pathway for the ingress of water and aggressive agents such as CO 2 (lowering of pH around the rebar) and chloride anions (pitting corrosion) into concrete. The physical formation of cracks therefore favors the chemical degradation of concrete ...
Frost damage can occur as cracks, stone splinters and swelling of the material. When water freezes, the volume of water increases by 9 %. [citation needed] When the volumetric moisture content exceeds 91 %, then the volume increase of water in the pores of the material caused by freezing cannot be absorbed by sufficient empty pores. This causes ...
Many depend on circumstances. A major component is cement, which has its own environmental and social impacts and contributes largely to those of concrete. The cement industry is one of the main producers of carbon dioxide, a greenhouse gas. [2] Concrete causes damage to the most fertile layer of the earth, the topsoil.
A pipe owned by Aquarion Water Company broke Wednesday near the Hampton Beach water tower, causing Church Street to flood for about an hour according to officials.
Class of water damage is determined by the probable rate of evaporation based on the type of materials affected, or wet, in the room or space that was flooded. Determining the class of water damage is an important first step, and will determine the amount and type of equipment utilized to dry-down the structure. [7] Class 1 - Slow Rate of ...
A hydrogen peroxide line at the Chiquita Canyon Landfill in Castaic burst, injuring one person Friday evening, according to the Los Angeles County Fire Department.
A water pipe that burst overnight and flooded Duke University Hospital continued to cause problems Friday, with ambulances being diverted to other hospitals in the region. A chilled water pipe ...
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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