Methods of protecting concrete from freeze damage
AssigneeThe Trustees of Princeton University
InventorsGeorge W. Scherer, Jeffrey Chen, John Valenza
Life of this patent
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Abstract
A method of protecting a cementitious mixture from freeze damage is provided. The method consists of incorporating an entrainment air composition into the cementitious mixture to form air voids in the concrete, and further adding an effective agent for nucleating ice, preferably, in the air voids, such that upon the freezing of concrete formed from the cementitious mixture, ice is nucleated in the air voids. In one embodiment, the air entrainment composition includes ceramic shells, which could be impregnated with an agent for nucleating ice such as metaldehyde.
Claims29
A method of protecting concrete from freeze damage comprising incorporating an amount of air into a cementitious mixture to form air voids in the concrete formed by the cementitious mixture, the cementitious mixture including an amount of an air entrainment agent and an effective agent for raising the nucleation temperature of ice to at least approximately −5° C. for nucleating ice in the air voids upon the freezing of the concrete.
A method of protecting concrete from freeze damage comprising incorporating an amount of air into a cementitious mixture to form air voids in the concrete formed by the cementitious mixture, the cementitious mixture including an amount of an air entrainment composition and an effective amount of an agent for raising the nucleation temperature of ice to at least approximately −5° C. for nucleating ice, selected from the group of metaldehyde, acetoacetanilide, p-bromoacetphenone, coumarin, m-nitoaniline, pthalic anhydride, and 2,4,6-trichloraniline for nucleating ice in the air voids.
A method for protecting concrete from freeze damage comprising:
- mixing an air entrainment composition into a cementitious mixture to form air voids in the concrete;
- adding an agent for raising the nucleation temperature of ice to at least approximately −5° C. for nucleating ice in the cementitious mixture;
- and
- allowing the cemetitious mixture to form concrete.
A concrete composition including pores and air voids comprising a nucleating agent within the air voids for raising the nucleation temperature of ice to at least approximately −5° C. for nucleating ice within the air voids.
A method of protecting concrete from freeze damage by providing an air entrainment agent comprising mixing an amount of hollow porous shells into a cementitious mixture, introducing a nucleating agent for raising the nucleation temperature of ice to at least approximately −5° C. for forming ice in the hollow porous shells, and allowing the cementitious mixture to form concrete, wherein the hollow porous shells allow water to pass thereinto.
A concrete composition comprising a cementitious mixture with porous hollow shells mixed therein for allowing water to pass thereinto, to prevent freeze damage to the concrete composition;
- and a nucleating agent for raising the nucleation temperature of ice to at least approximately −5° C. for forming ice in the porous hollow shells.
A method of protecting concrete from freeze damage comprising introducing hollow porous shells containing a nucleating agent for raising the nucleating temperature of ice to at least approximately −5° C. into a cementitious mixture, and allowing the cementitious mixture to form concrete, wherein the hollow porous shells allow water to pass thereinto and the nucleating agent causes ice to form therein.
Dependencies are inferred from the claim text.