Civil Engineering Reference
In-Depth Information
15
PC
The curve of ExpDec it
10
y
= 16.21exp(-
x
/33.06) -10.33
5
2
= 0.50033
R
0
-5
-10
-15
-20
0
50
100
150
200
250
e
2
(
με
)
4.9
Relationship between FCR and
ε
2 of PC.
20
NCB03
The curve of ExpDec it
10
y
= 56.89exp(-
x
/85.79) -44.85
0
2
= 0.92748
R
-10
-20
-30
-40
-50
0
50
100
150
200
250
e
2
(
με
)
4.10
Relationship between FCR and
ε
2 of NCB 03.
•
The correlation coeffi cient
C
R
2
of a plain concrete (PC) beam is only
0.50. This means that in a PC beam without conductive admixtures, the
tested value is not strong in relation to the prediction in Eq. [4.4].
The correlation coeffi cient
C
R
2
of other beams with conductive materials
such as NCB, CF or diphasic electric conductive materials (NCB
•
CF)
is higher than 0.76. Hence, the relationship between FCR and strain of
IGNA is quite strong when correlated with Eq. [4.4].
+
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