Sammendrag
The demand of long-lasting reinforced concrete for energy infrastructures under extreme operating conditions requires the development of multifunctional strategies integrated in concrete formulations and advanced stable bulk concretes from optimized binder technologies. Innovative materials and novel technologies at acceptable costs need to be considered. Self-protection ability of (reinforced) concrete structures against aggressive environments (acidic attack / corrosion / freeze-thaw cycles / ice-abrasion) is one of the customized methodologies for sustainable operation.
Modified derivatives of polyhedral oligomeric silsesquioxanes (POSS) have been prepared at SINTEF following the cost-efficient two-step synthesis route of the patented FunzioNano® hybrid technology. The solvent-free, dried products are available as fine-graded powders or can be delivered as aqueous dispersions.
A variety of POSS derivatives with water-repellent properties was applied to modify bulk concrete as a hydrophobic non-reactive additive for reinforcing concrete without inducing mechanical stress to the bulk material. In this way, self-protecting (SP) properties of bulk concrete will improve the performance in harsh environments.
Compatibility testing of the different POSS derivatives in a norm mortar mix design revealed the impact on fresh properties (rheology, hydration kinetics) and early-age mechanical properties. Positively evaluated POSS derivatives were implemented as functional admixtures to various concrete mix designs chosen for different exposure scenarios. The durability of such advanced reinforced concrete structures developed was studied at lab-scale and under severe conditions.
Selected results from the materials development will be presented.
Modified derivatives of polyhedral oligomeric silsesquioxanes (POSS) have been prepared at SINTEF following the cost-efficient two-step synthesis route of the patented FunzioNano® hybrid technology. The solvent-free, dried products are available as fine-graded powders or can be delivered as aqueous dispersions.
A variety of POSS derivatives with water-repellent properties was applied to modify bulk concrete as a hydrophobic non-reactive additive for reinforcing concrete without inducing mechanical stress to the bulk material. In this way, self-protecting (SP) properties of bulk concrete will improve the performance in harsh environments.
Compatibility testing of the different POSS derivatives in a norm mortar mix design revealed the impact on fresh properties (rheology, hydration kinetics) and early-age mechanical properties. Positively evaluated POSS derivatives were implemented as functional admixtures to various concrete mix designs chosen for different exposure scenarios. The durability of such advanced reinforced concrete structures developed was studied at lab-scale and under severe conditions.
Selected results from the materials development will be presented.