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Q. Coating on concrete – complete im-permeability to moisture?
In designing protective coating on concrete structures, stoppage of water ingress by the coating is generally required. Since chloride ions frequently diffuse into concrete in solution and cause deterioration of concrete structures, prevention of water transmission into coating certainly helps to protect concrete structure. Though if water gets behind the coating from some means and becomes trapped, its effect may not be desirable. Firstly, vapour pressure will be developed behind surface treatment and this leads to loss of adhesion and eventual peeling off of coating. Furthermorewater creates a suitable environment for mould growth on concrete surface.
As a matter of fact surface treatment must be so selected that it's impermeable to liquid water though it is permeable to water vapour. This 'breathing' function enhances the concrete to lose moisture through evaporation and reject uptake of water at the time of wet periods.
Tack coat - emulsified asphalts vs. cutback asphalts Emulsified asphalt is a suspension of asphalt in water by employing an emulsifying agent that imposes an electric charge o
Find the Cumulative Distribution Function: Find the cdf of Y = Z 2 where Z - N (0,l) Solution: F(y)= P(Y ≤ y) = p(z 2 ≤y) = P(-√y≤ √z≤√y) = ?(√y)- ?(-√y) = ?(√y)
I.S. CODES ON EARTHQUAKE RESISTANT BUILDING DESIGN Bureau of Indian Standard has divided the country into five zones depending upon the severity of earthquake after observing
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Q. Granular fill or rock fill essential at the base of concrete retaining walls? It isn't uncommon that rock fill layers and granular fill layers are placed beneath the bottom
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