diapositive 1 - laboratoire de construction en béton ibeton · ppt file ·...
TRANSCRIPT
Ultra High Performance Fiber Reinforced Concretefor structural applications
D. Redaelli – Supervisor Prof. Dr A. Muttoni
• Acquire a better knowledge on the interaction between UHPFCR and ordinary reinforcement in the tensile zones of structural elements.
• Model the structural response of different type of reinforced UHPFRC elements.• Define suitable applications for UHPFRC with and without ordinary reinforcement.
Objectives of the Research
« Reactive powder matrix » :High compressive strength and
High compactness+
2% in volume of short steelfibres for ductility
Ordinary Concrete UHPFRC
Compressive strength 30-80 200 MPa Young modulus 30 60 GPa Tensile strenght (matrix) 3 10 MPa Tensile strength (fibers) - 12 MPa
With a strain hardening behaviorin pure tension
1.00
m
• New test set up for reinforced members in tension
- 1.6 m long 160 x 160 mm specimens- High force potential : 180 tons
• Crack pattern development and strain localization mechanism followed up to failure
• Influence of the type and amount of steel reinforcement on the structural behavior
Hot-rolled / Cold-worked steel1. Behavior at peak load2. Strain at failure
0
200
400
600
800
0 5 10 15 20Strain [%]
Stre
ss [M
Pa]
Hot-rolled steel
Cold-worked steel
0
300
600
900
1200
0 8 16 24Elongation [mm] (measure length 1.00 m)
App
lied
forc
e [k
N]
Keywords
Test seriesand results
UHPFRC
Ultra high performance concrete, fibres, strain hardening in tension, tensile members, ordinary reinforcement, ultimate limit state.
IS-BETON
Poster n° 49