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Calculation of Creep and Shrinkage
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Reference: ACI-209/ACI-435. All notations are same as per these codes.
Minimum member thickness, d =
mm
(see note 1)
Ambient relative humidity in %, H =
(see note 2)
Time at first loading, t =
days
Target slump, S =
mm
Fine aggregate in %, F =
Density of cement, B =
kg/m
3
Air content in %, A =
Include calculation at:
days
Creep
C
u
= 2.35xg
cr
gcr = K
h
c
K
d
c
K
s
c
K
f
c
K
ac
c
K
to
c
K
h
c
= 1.27-0.0067H =
K
d
c
= 1.12-0.0079d =
K
s
c
= 0.82+0.026S =
K
f
c
= 0.88+0.0024F =
K
ac
c
= max of 0.46+0.09A and 1 =
K
to
c
=1.25t
-0.118
=
g
cr
=
C
u
= 2.35*g
cr
=
C
t
=C
u
(t
0.6
/ (10+t
0.6
))
C
t
=
C
t
=
Shrinkage
e
sh
t = [t/(35+t)] e
shu
e
shu max
= 780x10
-6
* g
sh
g
sh
= K
h
s
K
d
s
K
s
s
K
f
s
K
b
s
K
ac
s
K
h
s
= 1.40-0.01H =
K
d
s
= 1.193-0.0127d =
K
s
s
= 0.89+0.016S =
K
f
s
= 0.90+0.002F =
K
b
s
= 0.75+0.000214B =
K
ac
s
= 0.95+0.008A =
g
sh
=
e
shu max
=
For 30 years:
e
sh
t =
e
sh
t =
Notes
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