Isg Resources, Inc.

Mainland Laboratory, Ltd.

Bruce Boggs

Douglas Rhodes

Ryan Creamer

Steve R Creamer

Robert M Bergman

The invention pertains to a method for producing rapid setting cement and to the compositions produced therefrom. The setting time of hydraulic cement compositions comprising Portland cement and fly ash can be accelerated by controlling the pH of an activator slurry used in the composition. The pH of the activator slurry is controlled by non-stoichiometrically balancing the accelerating salts therein such that the activator slurry is alkaline, or having a pH greater than 7. The slurry activator of the present invention generally includes a base component, an acid component, and water. The base component can include any basic alkali and alkaline earth metal hydroxide, or a salt of the acid component. The acid component may include a hydroxycarboxylic acid, preferably citric acid. Mortar and concrete compositions can be prepared with this hydraulic cement wherein the compositions can achieve high strengths in a short time.

Method for accelerating setting of cement and the compositions produced therefrom

Fiber reinforced aerated concrete compositions and methods of forming structural units such as blocks, panels, etc., from such compositions are disclosed. The compositions comprise a fly ash/cement slurry with a coated Al paste serving as the activator to generate the desired cellular structure. The composition can be self cured at ambient temperature and pressure without the need for ovens or autoclaves. The cured compositions can be easily cut into the desired shape by a band saw or the like.

Fiber reinforced aerated concrete and methods of making same

The invention pertains to a method of delaying the set time of cement and to compositions produced therefrom. The set time of hydraulic cement mixtures of fly ash pozzolans, specifically Class C and Class F, and Portland cement can be delayed by controlling the pH of a retarder slurry that is mixed with the dry components of the composition. The pH of the retarder slurry is controlled by balancing the salts therein such that the retarder slurry is acidic, or having a pH less than 7. The slurry activator of the present invention generally includes a pH balancing agent, an acid component, and water. The pH balancing agent can include any basic alkali and alkaline earth metal hydroxide, or a salt of the acid component. The acid component may include a hydroxycarboxylic acid, preferably citric acid. Slower setting mortar and concrete compositions having high strength can be prepared with this hydraulic cement.

Method of delaying the set time of cement and the compositions produced therefrom

A method for pretreatment of a quantity of fly ash for use in a cementitious composition containing an air entrainment agent. An effective amount of an aromatic carboxylic acid or its salts is added to the fly ash to satiate unburned carbon in the ash. The treatment with the aromatic carboxylic acid (or hydroxy substituted aromatic carboxylic acid or its salts) does not significantly promote or retard the air entrainment functions of the air entrainment agent.

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Kennesaw, GA, United States of America

Bruce Boggs