Steel fiber reinforced polymer (SFRP) and steel fiber reinforced grout (SFRG) have emerged as promising and cost-effective technologies for the external strengthening of RC structures. Disregarding the nature of the employed matrix (polymeric or cementitious), the bond of externally applied reinforcement is of critical importance for the overall performance of the strengthened structure, since it represents the means of stress transfer between concrete and the composite material. Improper bond characteristics should be avoided in the field applications as they may cause premature failure of the strengthening system. To date, only a few studies have been devoted to investigate the bond behaviour between concrete and SFRP/SFRG materials. The paper contributes to filling this knowledge gap by presenting the preliminary results of delamination tests performed on steel fiber sheets adhesively bonded to concrete blocks by using epoxy or inorganic matrix. Test results have provided valuable information in terms of maximum forces, strains and failure modes exhibited by varying the following relevant parameters: compressive concrete strength, density of the steel fiber tape and anchorage length of the sheet.
SISTEMI SFRP E SFRG PER IL RINFORZO DI ELEMENTI IN CALCESTRUZZO: RISULTATI DI TEST DI DELAMINAZIONE
NAPOLI, ANNALISA;REALFONZO, ROBERTO
2014-01-01
Abstract
Steel fiber reinforced polymer (SFRP) and steel fiber reinforced grout (SFRG) have emerged as promising and cost-effective technologies for the external strengthening of RC structures. Disregarding the nature of the employed matrix (polymeric or cementitious), the bond of externally applied reinforcement is of critical importance for the overall performance of the strengthened structure, since it represents the means of stress transfer between concrete and the composite material. Improper bond characteristics should be avoided in the field applications as they may cause premature failure of the strengthening system. To date, only a few studies have been devoted to investigate the bond behaviour between concrete and SFRP/SFRG materials. The paper contributes to filling this knowledge gap by presenting the preliminary results of delamination tests performed on steel fiber sheets adhesively bonded to concrete blocks by using epoxy or inorganic matrix. Test results have provided valuable information in terms of maximum forces, strains and failure modes exhibited by varying the following relevant parameters: compressive concrete strength, density of the steel fiber tape and anchorage length of the sheet.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
