Carcoar Dam
DAMR.H
- FOSTER
Principal Design
Engineer THE FOLLOWING MATTERS RELATED TO
CARCOAR
DAM
ARE
SUBMITTED FOR
DISCUSSION AND ADVI SING DURING SITE
INSPECTION
ON
THE
28 TH
AND
29 TH
JANUARY,1970 Locality Map
Camps and Works Areas
Carcoar Darn
General Arrangement
Carcoar Dam
_ Arch Conereting Progress Chart
Carcoar Dam
- Fondation Excavation
Carcoar Dam
Grout Curtain Summary
Carcoar Dam
Concreting Position during Primary
Grouting and Prelimina ry
Secondary
GroutingConstruction Programme
Concreting Progress
Concrete Placement and Mix Design
Fondation Excavation
Curtain and Blanket Grouting
Contraction Joint Grouting and instrumentation
Plan Modifications SUPPLEMENTARY DATA ON SUPPLEMENTARY DATA ON
CONTRACTOR'S PROGRAMME TaNt
TROM REPORT OP 19TH DECEMBER
1969 ON
LATEST
ni a
naed network was prepared to
7569: EminuRE %6 HePaunaeF9quested in our
requirementa
erra
dated 31 st
Th
2
Phat
in accordance
ce
de
9
above
thte
quirement coula
with
thos
tOP
requirements
except
of the
obtained by
commence STout lift level
Compliane
anid che
Contractor 18
matter
gh
one day
delay in pouring two blocks.
ould be
achieved by
the
relation to
progressive modification
the
actua1 concrete placement
Contractor and the limit of 9 ft
aime of grouting unless further advice ta given.
sh ould be
adhered to at theFRESASTNTEOM REPORT OF I9TH DECRMBER. 1969 ON LATEST
This revised network
1a
for the
Octo bere
corsos-ta
was prepared te incorporate destgn
hereunder)
equested in our letter b
Atra
ens
in accordance
thos e requirementa
exceeda
9
wich chie
requirement could'
before primary grouting of that lift 15
be obtained by
a one day
commenced
Compliane
delay in pourina twe blocka
matter
prOg
achieved by
sh ould be considered in relation to the actuel concrete placement
che
Contractor and the limit of 9 ft.
rime
of grouting unless further advice la given.
sh ould be adhered to
ALFan ERrad
SP
from
the
econde.
1O
15
entraction joint
le not in compliance
-70 shown
grouting
in
15
with
outing
tO
be
the
car
ed out
th
period should be adhered
and
t0 •
remme
regaires
eriod
tO
The
specified
(w)
The
in blocks
activity involving
and
clogure
in con junction
and adjustment of this
with requirements for contraction joint
activity may
(B)
ARCH CONCRETING PROGRAMME
CD 650 A
provision indicated in
The sequence of arch
concreting maintains the low blocks diversi
the design newpoint,
Specification Plan 135/358A and is
satisfactory
Ex1
This is
unlikely to be
would probably
a
then
be
more
cause,
apparently
only
one
2
cu.và.
as the occurrence of the soft concrete
and
confined to what is
storage facilities and this would tena to
Admixtures are
drum
or set retardal ed in
applies.
One
drums
chance
of only 2
small.
disperse any pockets of
the
of th ose cu. yds. being affected if the
the same comment
of
concrete anà
was low-
It is not known how the
admixtures
aggregate could inhibit
quality
settin& council
County
{nd the water used 1s comestic water supplied by th e central Tablelanas
Contamination
of Materials
No source of contamination has been detected this
sour ce of conte minghor hhat Would affect only i barch at contre le t) sueriy or
far particularly
potardation due ta Phosphate contamination from cement trucks doublingEs
Pertiniser tran sports has been investigated and muled out,
operating the trucks, (from Blayney raithead"a
as the Arm
the site) carts exclusively"
cement.OE
mon ana
a fulT
eing undertaken
report
will
inen
speci
C
oncrete:
enga
CLE
had
crete
about
1969 th e Contractor
abutment
downstre
em
Let long ana i2 28 it
waS
inches
soft
block L1 had
revealed that
an
placed
on
14th
November,
an
crumbly
1969 p
trie
near
the
Rift
was
of lift
ola
eared normal
and
th an
the
other
consistant with
days
and
the
concrete
surTounding
ih
this
our
age
rtar
coula be
scrapeà
concrete and was not
The
soft
area
Wa,3
out with
obviously
imixtures.
with
the
deficientin
seemin,
fingers
and
smelled.
Daravai~).
It
waS
, predominance
put there was no lack of compaction*
afFeTte Ro juage wheth en aNF
very
of vinsol resin
(the basie
content was
siV
emoved the
apparent.
Washing the
concrete
exce
in
water
concrete visible in the
cemen t paste almost entirely from the aggregate-
othe.
du ring concreting.
lift was normal,
All
as
were the
fOUT
samples
taken
normal for this concrete.
strengths
average 2520 )b/ sa in.
which is
on the following dey (26/11/69) a
similar area was found near the top
of the right hand,
upsiream
corner
of lift 28 of aburment bloc k R.I
was about 22 hours old at th e time.
Ibis
The soft area
similar
size
area had a
, moist appearance, but after 3 to 4, hours began
elther of
in
'gach case the poor concrete occurred WithiA
The only other feature of possible significance 1s tha
a few batch es of the completie
of the pours.o loc alised area
of concrete ha
cted in
hich
dening
of the
cement paste
hibited,
At present large
apP
ears
DO
een
partially or
Ou
erdoses
of s
etarding agent are
have occu Fred through possible melfunctioning and miause of
¿spensing
equipment.
+ 19
hoped that tests
TOY
being undertaken
¡h e actua
cause
of the phenomenon
Full report will then
eStA
De
compiled
Concrete:
la ma concrete chat hangad in patchima
On the 25th Nove
mber •
1969 th e Contractor
_she-bolt boles
on
abu tment block L1 had
area of concrete about 10
get•
Inspection revealed that an
28 and on its dovnatreem face
high
having been placed on 14th November,
was soft an d crumbly.
days old
concrete surrounding th
The
soft area WaS
the other concrete and was not obviously deficient in
Mortar could be scraped out with the fingers and smelled very
cement.
with a seeming predominance of
It was difficu8
been
th
various tests.
breathere
for
Wo
suspended in
R
the meantime•
Grace have
rate
each
When this
dispenser
which
ch
install
piproof; nough tests
is
w1l1 make the units
done it
virtually
Daratara
even
are not complete
ample de PP ROTE
tO
review the use
hot weather
concreting.
Contractor requests
for
its
229Subsequent testing
at Head Office an d the
Site indicated that
massive
overdoses
non-setting and the
of the order of 1000% of Daratard cause
presence of such
Concrete was found in la bo ratory testing.
overdose in the faulty