초록 ▼

A method of reinforcing cement/concrete mixtures with alkali-intolerant reinforcements and/or aggregate, such as uncoated, common glass filament, plastic filament, fabric and roving made therefrom by reducing the pH of the mixture while in its plastic state, and/or after it has set and cured, to abo

A method of reinforcing cement/concrete mixtures with alkali-intolerant reinforcements and/or aggregate, such as uncoated, common glass filament, plastic filament, fabric and roving made therefrom by reducing the pH of the mixture while in its plastic state, and/or after it has set and cured, to about 7. With a neutral pH, the alkali-intolerant reinforcements need not be coated to protect them from degradation. In the absence of alkalinity, the reinforcement and/or aggregate material bonds with the cement mixture to form a relatively stronger mixture, which can be shaped as desired, made part of permanently poured structures, cement boards and many other small and large products. By selecting appropriate and, if desired, different materials for the reinforcements and/or aggregate, the strength, flexibility, etc. characteristics of the product can be readily changed to adapt the product to the intended use. The pH is reduced by migrating such materials as CO2 and/or CO and O3 into the cement after it has cured and, if desirable, also during curing. The CO2 and/or CO and O3 for the chemical reactions to reduce the pH are most suitably obtained from flue gases of independent combustion processes which would otherwise be discharged as atmospheric pollutants.

대표청구항 ▼

A method of protecting alkali-intolerant material in a cured cement product comprising the steps of mixing dry cement, ground calcite, and an alkali-sensitive material, adding water to form a paste, molding the paste into a product, curing the product, exposing the cured product to carbon dioxide, a

A method of protecting alkali-intolerant material in a cured cement product comprising the steps of mixing dry cement, ground calcite, and an alkali-sensitive material, adding water to form a paste, molding the paste into a product, curing the product, exposing the cured product to carbon dioxide, and reducing the pH of the mixture to about 7 by generating calcium carbonate in calcite form.