Post by jeff on Mar 19, 2016 15:03:43 GMT
A major issue with using concrete in hulls is its' low ductility. Studies of concrete for use in earthquake zones show that confinement of the concrete dramatically increases the ductility. Essentially, laminating (confinement) the concrete between layers of FRP (Fiber Reinforced Polymer) can dramatically enhance the ductility properties of concrete. This is essentially the same as foam core fiberglass hull technology, just different material.
The following document, while primarily concerned with structural beams, contains the essential information:
Ductility of FRP–concrete systems: Investigations at different length
scales
Oguz Gunes, Denvid Lau, Chakrapan Tuakta, Oral Büyüköztürk
pdf
www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&cad=rja&uact=8&ved=0ahUKEwj1-oqd_MzLAhVDKiYKHVFXB0AQFghFMAU&url=http%3A%2F%2Fweb.mit.edu%2Fliss%2Fpublications%2Fgunes_lau_tuakta_ob_cbm.pdf&usg=AFQjCNH4sbk2Ok0oNWht5H8vuC352DN3jA&sig2=uuDpK7qe5NuttVAOeE9B2Q
Ductility enhancement of geopolymer concrete columns using fibre-reinforced polymer confinement
Weena Lokuge and Warna Karunasena
Abstract
Geopolymer concrete is an environmentally friendly, green construction material. However, its use is constrained by its
increased brittleness and lack of understanding of its behaviour under multi-axial loadings. Similar to ordinary portland
cement concrete (OPC), the ductility of geopolymer concrete columns can be increased by lateral confinement and using
fibre-reinforced polymers is one option in doing that. This research paper aims at investigating the effect of different
confinements on the ductility of geopolymer concrete. Three different mixes with varying binder (fly ash and slag) and
different curing conditions together with different levels of carbon fibre reinforced polymer (CFRP) and glass fibre
reinforced polymer (GFRP) confinement were investigated in this research paper. FRP confined normal strength
geopolymer concrete shows similar stress–strain behaviour when compared to that of high-strength OPC concrete
When compared with the same level of confinement, CFRP confined geopolymer concrete marginally outperforms GFRP
confined geopolymer concrete in 28-day compressive strength. However, ductility levels with GFRP confinement are
better than those with CFRP confinement.
pdf
www.researchgate.net/profile/Weena_Lokuge/publication/282803002_Ductility_enhancement_of_geopolymer_concrete_columns_using_fibre-reinforced_polymer_confinement/links/56a695a708ae860e0253cce7.pdf?origin=publication_detail&ev=pub_int_prw_xdl&msrp=XpJxkkHu6IlcWOb5dEK_Mu44ts-XHbqNb_Vm57RiPdR5BzsGpwqgWmLQSlHpPFcniyE0q6wZxvjEHfEm_H9J-g.q_ehebIDnfd-c3Z0RLhPak1xQn3yeC9i9P7DgjFOpTsU2lXZJO5wn83mzNBRMKLXRyiQuFyplALwIw5XVIQHlg.hFSAGvXtp2KruHkhXCE6YauS_9Ggpo03J_zYzmFg72gJp-tSSJ-ATg5n7hUVNs8kp89aOdvqZ-wR85nr7M-5NQ
The following document, while primarily concerned with structural beams, contains the essential information:
Ductility of FRP–concrete systems: Investigations at different length
scales
Oguz Gunes, Denvid Lau, Chakrapan Tuakta, Oral Büyüköztürk
www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&cad=rja&uact=8&ved=0ahUKEwj1-oqd_MzLAhVDKiYKHVFXB0AQFghFMAU&url=http%3A%2F%2Fweb.mit.edu%2Fliss%2Fpublications%2Fgunes_lau_tuakta_ob_cbm.pdf&usg=AFQjCNH4sbk2Ok0oNWht5H8vuC352DN3jA&sig2=uuDpK7qe5NuttVAOeE9B2Q
Ductility enhancement of geopolymer concrete columns using fibre-reinforced polymer confinement
Weena Lokuge and Warna Karunasena
Abstract
Geopolymer concrete is an environmentally friendly, green construction material. However, its use is constrained by its
increased brittleness and lack of understanding of its behaviour under multi-axial loadings. Similar to ordinary portland
cement concrete (OPC), the ductility of geopolymer concrete columns can be increased by lateral confinement and using
fibre-reinforced polymers is one option in doing that. This research paper aims at investigating the effect of different
confinements on the ductility of geopolymer concrete. Three different mixes with varying binder (fly ash and slag) and
different curing conditions together with different levels of carbon fibre reinforced polymer (CFRP) and glass fibre
reinforced polymer (GFRP) confinement were investigated in this research paper. FRP confined normal strength
geopolymer concrete shows similar stress–strain behaviour when compared to that of high-strength OPC concrete
When compared with the same level of confinement, CFRP confined geopolymer concrete marginally outperforms GFRP
confined geopolymer concrete in 28-day compressive strength. However, ductility levels with GFRP confinement are
better than those with CFRP confinement.
www.researchgate.net/profile/Weena_Lokuge/publication/282803002_Ductility_enhancement_of_geopolymer_concrete_columns_using_fibre-reinforced_polymer_confinement/links/56a695a708ae860e0253cce7.pdf?origin=publication_detail&ev=pub_int_prw_xdl&msrp=XpJxkkHu6IlcWOb5dEK_Mu44ts-XHbqNb_Vm57RiPdR5BzsGpwqgWmLQSlHpPFcniyE0q6wZxvjEHfEm_H9J-g.q_ehebIDnfd-c3Z0RLhPak1xQn3yeC9i9P7DgjFOpTsU2lXZJO5wn83mzNBRMKLXRyiQuFyplALwIw5XVIQHlg.hFSAGvXtp2KruHkhXCE6YauS_9Ggpo03J_zYzmFg72gJp-tSSJ-ATg5n7hUVNs8kp89aOdvqZ-wR85nr7M-5NQ