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Durability of a multiscale fibre reinforced cement composite in aggressive environment under service load
The LCPC has developed and patented a new ultra high performance fibre reinforced cement composite (UHPFRCC); the introduction of three steel fibre sizes leads to a multiscale fibre reinforced cement composite (MSFRCC) with multi-cracking and hardening behaviour in uniaxial tension (ft more than 20 MPa). An innovative test of durability is presented. Pre-cracked thin slabs are damaged by fatigue under loading corresponding to service load (30 MPa in bending test) then maintained under bending at the same level. A part of these slabs undergoes 30 weekly wetting-drying cycles in a chloride solution (NaCl 5%, 20 degree C). A reloading to failure is led. One notes an absence of corrosion in the micro-cracked area even for cover lower than 300 my m and a strength increase for pre-damaged slabs by fatigue. Under service load and in the presence of chloride water, a quasi-total recovery of initial stiffness is possible; it is accompanied by an increase of the pseudo-elastic behaviour. The development of a better matrix/micro-fibres synergy and a diffuse micro-cracking explains this result.
Durability of a multiscale fibre reinforced cement composite in aggressive environment under service load
The LCPC has developed and patented a new ultra high performance fibre reinforced cement composite (UHPFRCC); the introduction of three steel fibre sizes leads to a multiscale fibre reinforced cement composite (MSFRCC) with multi-cracking and hardening behaviour in uniaxial tension (ft more than 20 MPa). An innovative test of durability is presented. Pre-cracked thin slabs are damaged by fatigue under loading corresponding to service load (30 MPa in bending test) then maintained under bending at the same level. A part of these slabs undergoes 30 weekly wetting-drying cycles in a chloride solution (NaCl 5%, 20 degree C). A reloading to failure is led. One notes an absence of corrosion in the micro-cracked area even for cover lower than 300 my m and a strength increase for pre-damaged slabs by fatigue. Under service load and in the presence of chloride water, a quasi-total recovery of initial stiffness is possible; it is accompanied by an increase of the pseudo-elastic behaviour. The development of a better matrix/micro-fibres synergy and a diffuse micro-cracking explains this result.
Durability of a multiscale fibre reinforced cement composite in aggressive environment under service load
Parant, Edouard (author) / Pierre, Rossi (author) / Maou, Fabrice Le (author)
Cement and Concrete Research ; 37 ; 1106-1114
2007
9 Seiten, 19 Quellen
Article (Journal)
English
aggressives Medium , Biegeprüfung , Dauerhaftigkeit , einachsige Spannung , Elastizität , faserverstärkter Zement , hochfester Werkstoff , Korrosionsbeständigkeit , Kriechen (Werkstoff) , Mikroriss , Natriumchlorid , Rissbildung , Salzkorrosion , Schadensanalyse , stahlfaserverstärkter Beton , Ultrahochfestigkeit , Zugbeanspruchung , Zugdehnung
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