Abstract: A method of predicting characteristics of concrete includes inputting data on a cement mixture including cement and an admixture, calculating reactivity of the admixture based on the data, and predicting products of the cement mixture based on the reactivity, and an embodiment further includes predicting characteristics of concrete based on the predicting of the products of the cement mixture based on the reactivity.

Abstract: A method for curing cementitious articles includes flowing dry steam and carbon dioxide (CO2) simultaneously into a curing chamber containing a cementitious article. A relative humidity within the curing chamber may be between about 50% and about 70% and a temperature within the curing chamber may be between about 50° C. and about 70° C. A dry steam and CO2 mixture with a CO2 concentration between 2.5 vol % and 40 vol % is provided in the curing chamber and the cementitious article is cured for a duration between about 4 hours and 16 hours. Cementitious products cured with the method may have a CO2 uptake of greater than 15 wt % and a mechanical strength at least 10% greater than a cementitious product cured only in dry steam or CO2.

Abstract: Disclosed is an electrically conductive cement-based composite composition capable of exhibiting stable electrical performance since carbon nanotubes and carbon fibers are mixed in cement at a proper weight ratio so as to lower sensitivity to a specific resistance change caused by the change in a water/cement ratio (w/c). The electrically conductive cement-based composite composition includes, in order to have stable electrical characteristics of which a specific resistance is 100 ?·cm or less even with the change in the water/cement ratio (w/c), the cement, 0.1-0.5 wt % of the carbon nanotubes on the basis of the cement weight, 0.1-0.4 wt % of the carbon fibers on the basis of the cement weight, and silica fume and a superplasticizer as other additives.

Abstract: A method for curing cementitious articles includes flowing dry steam and carbon dioxide (CO2) simultaneously into a curing chamber containing a cementitious article. A relative humidity within the curing chamber may be between about 50% and about 70% and a temperature within the curing chamber may be between about 50° C. and about 70° C. A dry steam and CO2 mixture with a CO2 concentration between 2.5 vol % and 40 vol % is provided in the curing chamber and the cementitious article is cured for a duration between about 4 hours and 16 hours. Cementitious products cured with the method may have a CO2 uptake of greater than 15 wt % and a mechanical strength at least 10% greater than a cementitious product cured only in dry steam or CO2.