By mimicking a Type TV cement reaction in a Type I or Type II portland cement mixture, engineers and contractors will see more controlled, cooler hardening and curing phases compared to conventional concrete.
Type I and Type II portland cements comprise both dicalcium and tricalcium silicates," explains CoolCure developer and Silicone Solutions President David Brassard, who is commercializing the admixture through a subsidiary, New Technology Solutions LLC.
The mix per cu yd consisted of 752 lb of Type II portland cement, 1,610 lb of nine sand, 690 lb of 1/2.
The mixture proportions per cu yd consisted of 752 lb of Type II portland cement, 2,300 lb of fine sand, and 302 gal of water.
The RMC Research and Education Foundation-funded testing spanned three phases involving evaluation of concrete mixtures designed with Type II portland cement, slag cement and Class F fly ash.
Caption: Tests behind "Optimizing Mixtures" included Type II portland cement control plus Class F fly ash- or slag cement-dosed specimens.
Central to the technology are Type II portland cement mixes using two grades of aggregate: One an inexpensive, recycled manufacturing byproduct; the other priced as if it were sourced through DeBeers and fittingly dubbed "Black Diamond.
Initial tests suggested the mix design would require a superplasticizer dosed at 300 ounces per 100 weight of Type II portland cement.
Using what would be considered a normal amount of water, the fineness of the Type II portland cement and boron carbide powder drove a dosage of 300 ounces per hundred weight of cement of Sika Viscocrete 2100 polycarboxylate.