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Figure 2. Effect of temperature on strength gain of concrete
Table 7. Durability factors for Pozzutec 20 concrete
SR96_28
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3
4
5
6
7
8
9
10
11
12
13
500
400
Pozzutec
20
@ 60
mL/kg
Corr.
300
Line
Reference
200
Pozzutec
20
@
100
mL/kg
100
0
10
20
30
40
50
60
70
80
Weeks
Figure
3. Lollipop
specimens
submerged
half-height
in 3% sodium
chloride
solu-
tion.
200
160
120
Reference
80
Pozzutec
20
@ 60
mL/kg
40
0
10
20
30
40
50
60
70
80
Weeks
Figure
4. Lollipop
specimens
submerged
half-height
in
deionized
water.
cured
at 5C
(23
F) at
the
same
rate
as
that
in
Task
2:
Corrosion
potential
control
concrete
cured
at 5C
(40
F).
As can be
The
lollipop
test
results
show
that
mortars
seen,
the
7-,
14-,
and
28-day
strengths
of
the
high
treated
with 60 mL/kg
(90
fl
oz/cwt)
of
Pozzutec
dosage
concrete
cured
at 5C
(23
F)
were
signifi-
20
are
practically
identical
to
admixture-free
mor-
cantly
below
that
of
the
ACI
standard
for
5C
tar.
Figures
3
and
4
are
graphs
of
the
average
(40
F) concrete.
Strength
gain
at
10
and
20
C
potentials
from
three
specimens
over
a 1
1/2-year
(14
and
4F)
was
even
lower
(see
Fig.
2).
This
period.
There
is no
exact
potential
identifying
the
does
not
necessarily
mean
that
the
Pozzutec
con-
initiation
of
corrosion.
ASTM
C
876
identifies
po-
crete
has
been
damaged
by
freezing,
as
this
con-
tentials
more
positive
than
200
mV
vs.
copper
crete
displayed
a
remarkable
recovery
in
strength
sulfate
reference
electrodes
as
passive
or
noncor-
by 56
days
when
brought
back
to
room
tempera-
rosive
behavior.
Potentials
between
200
and
ture.
It does
suggest,
however,
that
a
new
admix-
350
mV
are
an
indication
that
corrosion
has
initi-
ture
would
have
to be
developed
to
fully
satisfy
ated,
and
potentials
more
negative
than
350
mV
the
low-temperature
goal
of
this
project.
indicate
a
high
probability
of
corrosion.
Since
our
8
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