Abstract
The article analyses behavior of compressed concrete cylinders which were strengthened with external high performance fiber reinforced cementitious composite (HPFRCC) layer. Two different HPFRCC materials were used for the strengthening, which differed in fiber type. Two different types of loading were applied as well. The load was transferred through the whole cross section of the strengthened element and through the core – internal concrete. Loading through the whole cross section allows to validate the mixture law. Loading through the internal concrete allows to investigate the confinement effect. Comparison of theoretically calculated and experimental strength shows that mixture law and confinement effect is valid. Confinement by HPFRCC allowed to increase the strength of concrete about 4 times, but the ultimate strain remains similar. The strength of elements loaded through the whole surface has increased much more and additionally the ultimate strain has increased too.
Highlights
Strengthening of columns is created by providing an additional confinement or incorporating a new layer which intercepts a part of the external load
The confinement is usually created as a thin layer of high performance material carbon fiber reinforced polymer (CFRP), PBO-FRCM (p-Phenylene Benzobis Oxazole fiber reinforced cementitious mortar), steel reinforced polymer (SRP), self-compacting concrete (SCC), textile reinforced concrete (TRC), steel-reinforced grout (SRG), and confinement usually increases the strength of internal concrete
Confinement of concrete by high performance fiber cementitious composite (HPFRCC) material had increased the compressed strength of concrete by 4 times
Summary
Strengthening of columns is created by providing an additional confinement or incorporating a new layer which intercepts a part of the external load. The additional layer which intercepts the part of external load can be made from steel profiles, concrete or masonry. After shrinkage of new layer, the area of transferred external load can move to the previous strengthened element area. In this case the external layer loses capacity to intercept the external load and begins to provide the confinement. The research (Vincent & Ozbakkaloglu, 2015) shows that due to shrinkage, increment of strains in CFRP and concrete changes and strength of confined concrete can slightly decrease
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