Dual-Phase (DP) steel reinforcing bars represent a valid alternative to TempCore® grades, being characterized by comparable values of strength and deformation capacity and, besides, by improved durability thanks to the typical microstructure in which the martensite phase – main responsible for corrosion – is not ‘external’ but ‘embedded’ in the ductile ferrite matrix. Actually, Dual-Phase grades are used for flat products (like sheets or plates) and normally produced in batch process by the application of an additional intercritical quenching thermal cycle able to guarantee the desired microstructure. The Authors deeply analyzed the possibility to produce Dual-Phase steel reinforcing bars without the need to strongly modify actual plants for reinforcing steel; a specific thermal cycle, consisting of an intercritical quenching followed by a rapid cooling stage applied to pre-selected chemical compositions allowed to achieve the desired microstructure. In the present work, the summary of the results of the whole mechanical characterization performed on DP steel rebars is presented in reference and corroded conditions, in comparison to traditional TempCore® B450C. Monotonic and cyclic experimental tests were performed to represent the effective situation of reinforcements in modern reinforced concrete constructions.
An alternative to TempCore®: Dual-Phase reinforcing steels. Mechanical characterization and durability performance.
Silvia Caprili
;Walter Salvatore;Renzo Valentini;
2019-01-01
Abstract
Dual-Phase (DP) steel reinforcing bars represent a valid alternative to TempCore® grades, being characterized by comparable values of strength and deformation capacity and, besides, by improved durability thanks to the typical microstructure in which the martensite phase – main responsible for corrosion – is not ‘external’ but ‘embedded’ in the ductile ferrite matrix. Actually, Dual-Phase grades are used for flat products (like sheets or plates) and normally produced in batch process by the application of an additional intercritical quenching thermal cycle able to guarantee the desired microstructure. The Authors deeply analyzed the possibility to produce Dual-Phase steel reinforcing bars without the need to strongly modify actual plants for reinforcing steel; a specific thermal cycle, consisting of an intercritical quenching followed by a rapid cooling stage applied to pre-selected chemical compositions allowed to achieve the desired microstructure. In the present work, the summary of the results of the whole mechanical characterization performed on DP steel rebars is presented in reference and corroded conditions, in comparison to traditional TempCore® B450C. Monotonic and cyclic experimental tests were performed to represent the effective situation of reinforcements in modern reinforced concrete constructions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
