Memorandum from C. R. Bramer to Clifford K. Beck
Typescript
4 pp.
July, 1951
MurNBconcretefinal070051



OFFICIAL USE ONLY

TO: Clifford K. Beck
FROM: C. R. Bramer
SUBJECT: Final Report on Concrete Tests

Series
&
Density
Date
Poured
MixWork-
ability
Appear.
Cast
Cylinder
SlumpCompressive
Strength and
Setting
Comments
A 1/4June 19
3:15 P.M.
13.27# 3/8 Bar.
220.26# 3/4 Bars
(Tenn.)
23.53# Col.
48.82#Type III
Cement
21.50# Water
PoorExcellent but
had to be
rodded excess-
ively
.
1/4"2,820 psi
Hard set at about
15 hrs.
Machine mixes all
aggregates & cement
dry mixed and then
all water added and
mixed for 2 minutes.
A 1June 19
3:30 P.M.
Mix as above except
extra water was added
to the remaining
portion of A 1/4.
FairExcellent
some excess
rodding requir-
ed
.
1"2,660 psi
Initial set about
24 hrs. Hard set
48 hrs.
 
  On above mix the 3/8" Barytes was screened to remove material
finer than 16 mesh.
 
BJune 21
3:00 P.M.
2.65# 3/8 Bar.
44.05# 3/4 Bar.
(Tenn.)
4.70# Col.
9.80# Type II Cement
3.64# Water
(Material finer than
16 mesh in 3/8 Barytes
was removed)
Very
Poor
Fair
Required ex-
treme
rodding.
Too
stiff
for
slup
test.
After 8 days in
damp room was still
soft. Removed to
lab., allowed to
dry out. Appeared
to set and harden.
Disintegrated com-
pletely
when drop-
ped
in trash can.
Col. & cement &
water hand mixed.
Then Bar. added
and hand mixed
again.
CJune 21
3:45 P.M.
10.65# 3/8" as is
36.05# 3/4 Tenn. Bar.
4.70# Col.
9.80# Type II Cement
4.14# Water
PoorGood Required
excess rodding
Too
stiff
for
slump
test.
As above for B.As above for B.


[page 2]

Series
&
Density
Date
Poured
MixWork-
ability
Appear.
Cast
Cylinder
SlumpCompressive
Strength and
Setting
Comments
DJune 22
1:05 P.M.
46.70# Bar. Ga.
4.70# Col.
9.80# Type III cement
Penn Dixie
4.00# Water
Fair to
Poor
Excellent
Required excess
rodding
Too
stiff
5,000 psi
Hard set in less
than 15 hrs.
Mixed Bar. & cement
& 3.64# water by
hand. Set in damp
room 40 minutes.
Removed, added and
mixed col. Added .36#
more water and mixed
again.
E
41.5#
218#/cu.ft.
July 9
4:45 P.M.
46.70# Bar. Ga.
4.70# Col.
9.80# Type III P.D.
4.00# Water
.1 fluid oz. Darex
Fair
Mix seemed
more uni-
form
but
was sticky
and had
oily ap-
perance
.
Fair, some
honeycombe
needed. Excess
rodding
Too
stiff.
3,950 psi
Not set 10 A.M.
July 10. Taking
initial set 5 P.M.
July 10. Hard set
3 P.M. July 11.
Hand mixed all
materials except
col. This was added
about 5 min. later
and then whole re-
mixed
.
F
41.62#
219# cu.ft.
July 9
5:40 P.M.
46.70# Bar. Ga.
4.70# Col.
9.80# Type III P.D.
4.40# water
.1 fluid oz. Darex
Good
Uniform
mix, but
sticky
and still
oily in
appear.
Good to
excellent
Slump
not
run,
but
would
have
been
about
1".
4,130 psi
Setting comments
same as E.
Mixing same as E.
G
40.82#
215# cu.ft.
July 10
11:55 A.M.
poured
46.70# Bar. Ga.
4.70# Col.
9.80# Type III P.D.
4.6# Water
Good to
fair.
Good to excel-
lent
, but re-
quired
excess
rodding
1/4"5,380 psi
Hard set at
3:00 P.M. July 11.
Hand mixed everything
without the col. Put
in humidity room for
5 min. Removed, added
colemanite, remixed
and poured


[page 3]

Series
&
Density
Date
Poured
MixWork-
ability
Appear.
Cast
Cylinder
SlumpCompressive
Strength and
Setting
Comments
HJuly 10
11:45 A.M.
46.70# Bar. Ga.
4.70# Col.
9.80# Type III P.D.
4.00# water
.20# Puzzolith
Best
workabili-
ty
so far.
Poor, Bad
Honeycombe.
Cast cyl. Mott-
led
in appear.
Seemed to have
been chem. Re-
action
between
Bar. And Puzz.
Not
run.
Not tested because
of honeycombe.
Not hard set at
3:00 P.M. July 11.
Was hard set at
10:00 P.M. July 12.
Hand mixed all
ingredients except
col. Added this
and remixed.
J
40.96#
216#/cu.ft.
July 10
4:30 P.M.
46.70# Bar. Ga.
4.70# Col.
9.80# Type III P.D.
4.50# water
.05# Puzzolith.
Best
work-
ability

thus far.
Good, some
honeycombe.
Normal rodding.
Inferior to K.
Not
run.
5,020 psi.
Hard set 3:00 P.M.
July 11.
Hand mixed Bar.,
cement, and 4.20#
water. Put in humid
room for 45 minutes.
Removed, mixed in col.,
added .30# water
mixed.
K
40.72#
214#
cu.ft.
July 10
5:00 P.M.
46.70# Bar. Ga.
4.70# Col.
9.80# Type III P.D.
4.50# water
5 cc Darex
Excellent
but not
as good
as J.
Mix still
seemed
oily and
sticky.
Excellent.
Better than J.
Normal Rodding.
Not
run.
4,820 psi
Hard set 3:00 p.m.
July 11
Hand mixed Bar. &
cement & 4.20# water.
Set in humid room
45 min. Removed,
mixed in colemanite,
added .30# water,
mixed.
L
40.50#
213# cu.
ft.
July 12
12:50 P.M.
93.40# Bar. Ga.
9.40# Col.
19.60# Type III P.D.
9.60# Water
Excellent
Best of all.
Excellent
smooth appear.
2 1/2"4,750, Hard set at
4:00 P.M. July 13.
Shrinkage of test
cyl. appeared
about same as
normal concrete.
Machine mixed. Bar.
& cement & 8.80#
water. Held in mixer
for 40 min. added col.
and mixed. Added
.80# water and mixed
again.
  This is the recommended mix for the Reactor
Concrete. C.R.B.
   


[page 4]

Series
&
Density
Date
Poured
MixWork-
ability
Appear.
Cast
Cylinder
SlumpCompressive
Strength and
Setting
Comments
N
28.75#
150.5#
cu.ft.
July 1230# gravel
20# sand
7# Type III P.D.
6# Water
Too wetExcellentExcess
slup
Not runHand mixed.
  Plain concrete cyl. for comparison only.