Civil Engineering Reference
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Quasi-static value
(interpolation for
0.05 MPa/s) and
standard deviation
Trend of evolution
with rate
Value
Direction
Young's modulus
A
50.9 GPa (2 GPa)
+ 0.32 GPa/u.log.
C
53.9 GPa (2.5 GPa)
+ 0.38 GPa/u.log.
A + B + C
52.2 GPa
+ 0.31 GPa/u.log.
Maximum stress
(unslotted
specimens)
A
5.96 MPa (2 MPa)
+ 0.82 MPa/u. log.
C
11.17 MPa (3 MPa)
+ 0.77 MPa/u. log.
A + B + C
8.52 MPa
+ 0.65 MPa/u. log.
Maximum stress
(slotted
specimens)
A
4.29 MPa (2 MPa)
+ 0.70 MPa/u. log.
C
16.35 MPa (5 MPa)
+ 0.73 MPa/u. log.
A + B + C
9.65 MPa
+ 0.40 MPa/u. log.
Equivalent
threshold stress
(1 mm opening)
A
3.75 MPa (1.6 MPa)
+ 0.53 MPa/u. log.
C
13.99 MPa (3.8 MPa)
+ 0.62 MPa/u. log.
A + B + C
8.06 MPa
+ 0.45 MPa/u. log.
Table 1.2.
Traction characterization of very high performance concrete and rate effects.
Results (means): A, B and C are the three perpendicular directions of the sampling
within an L piece deemed representative for the project (from [TOU 99b])
Let us recall that observing the mechanisms referred to above and obtaining
characteristic properties suited for the calculation of fiber reinforced concrete
structures demands respect for the strict regulations concerning possible anisotropies
in the behavior and constitution of the material, which may arise due to the
manufacturing mode of the structure [ROS 98]. It was thus possible to enhance
(Figures 1.21 and 1.22) rate effects (strength absolute increase), according to the
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