Methods of protecting concrete from freeze damage
OwnerGeorge W. Scherer, Jeffrey Chen +1inventors
InventorsGeorge W. Scherer, Jeffrey Chen, John Valenza
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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.
Claims25
A method of protecting a cementitious mixture from freeze damage comprising incorporating an amount of air into the cementitious mixture to form air pores in the cementitious mixture, the cementitious mixture including an amount of an air entrainment agent and an effective agent for nucleating ice in the air voids upon the freezing of the cementitious mixture.
A method of protecting a cementitious mixture from freeze damage comprising incorporating an amount of air into the cementitious mixture to form air voids in the cementitious mixture, the cementitious mixture including an amount of an air entrainment composition and an effective amount of an agent 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 pores.
A method for protecting concrete from freeze damage comprising:
- mixing an air entrainment composition into a cementitious mixture;
- adding an agent for nucleating ice to 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 nucleating ice.
A method of forming porous shells for use as an air entrainment composition for concrete comprising:
- suspending particles in a slurry;
- atomizing the slurry to form droplets;
- drying the droplets;
- and
- sintering the dried droplets to form shells with porous outer walls.
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 and allowing the cementitious mixture for form concrete, wherein the hollow porous shells allow water to pass thereinto.
A concrete composition formed of a cementitious mixture with porous hollow shells mixed therein for allowing water to pass thereinto, to prevent freeze damage to the concrete composition.
Dependencies are inferred from the claim text.