Open AccessHIGH Tg FRP & CEMENTITIOUS ADHESIVE, Potential benefits in fire for NSM FRP strengthened reinforced concrete beams
Author(s) -
Iolanda Del Prete,
Antonio Bilotta,
Luke Bisby,
Emidio Nigro
Publication year - 2016
Publication title -
applications of structural fire engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.114
H-Index - 2
eISSN - 2570-8074
pISSN - 2336-7318
DOI - 10.14311/asfe.2015.052
Subject(s) - cementitious , fibre reinforced plastic , materials science , thermal stability , thermogravimetric analysis , composite material , thermal conductivity , grout , adhesive , cement , chemistry , organic chemistry , layer (electronics)
Near surface mounted FRP strengthening is potentially less prone to damage due tofire exposure than externally bonded FRP reinforcement (EBR), provided that: (a) an FRP strengthening material with high glass transition and decomposition temperatures ( T g and T d , respectively); and (b) a bonding agent with low thermal conductivity and good thermal stability, are used. This paper presents a project undertaken on a specific high T g and cementitious adhesive bonded NSM FRP strengthening system. Dynamic Mechanic Analysis (DMA) and Thermogravimetric Analysis (TGA) performed on the novel high T g commercial CFRP bar yielded a T g value of 220°C (based on peak) and T d of about 360°C. Thermal conductivity tests were also performed on the cementitious grout. The results were used to better explain the failure modes of NSM FRP strengthened reinforced concrete beams at elevated temperature. The paper highlights the importance of understandingthe thermo-mechanical properties of the various constituent materials for improving the performance of FRP strengthening systems in fire.