20 BULLETIN 230, I'. S, DEPARTMENT OF AGRICVLTTTRE. 
Table 7. — Compression tests of oil-concrete 6 by 6 inch cylinders. 
5~ ; : :- 
— en 
No. 
Pro- 
por- 
: rions. 
S£l i»f: 
Per 
ofl. 
- 
Water cured. 
2S da vs. 
18 lays. ScOdavs 
".:: : .--s. :- .::.T5. 
I8f lays 
360 days. 
r20davs. 
9... 
10.. 
11.. 
12.. 
13.. 
14.. 
15.. 
! .. 
17. . 
IS.. 
: i. 
168. 
1 . . 
177. 
.7:. 
480. 
481. 
482. 
S.. 
s:i. 
- :. 
s ;•. 
796. 
7". 
?PS. 
: i 
+ .:■! 
- 2 
4923 
,;:, 
49ffl 
4;s: 
iPs: 
-.:■:: 
7: : : 
i 
1:3:6 
I: : 
1:3:6 
1:3:6 
I 
1:3:6 
I 
1:3:5 
1:3:5 
1:3:5 
1:3:5 
1:3:5 
1:3:5 
1.5:4.5 
1.5:4.5 
1 1:4 
1.5:4.5 
1:2:4 
1:2:4 
1:2:4 
1:2:4 
1.5:4.5 
1.5:4.5 
1.5:4.5 
1.5:4.5 
1.5:4.5 
1.5:4.5 
1.5:4.5 
1.5:4.5 

-: 
5 
:: 
1: 
:: 
:•: 
. 
.; 
: 
i: 
15 
: 
o 
:: 
5 
:: 
: 
: : 
5 
:: 
; 
-: 
5 
:: 
: 
:- 
5 
i: 
" - 
m - 
656(2) 
: ; 2 
695 C2) 
605 (3) 
920(2) 
787 . 
715(2) 
::■? : 
693(2) 
572 (2 • 
1.SS0 (2) 
1.345 (2) 
:.;-."■ : 
980 (2) 
i.o>: 
I.? - : 
I.-::-: 
1.17; 
990 
911 
73S 
980(21 
IS - 
975 (2) 
755 (2) 
7: . 
840(2) 
678 (2) 
::- 1 
945(3) 
s:: : 
? ; 
S2S(3) 
639 (2) 
■2.:r. : 
1,490 (2) 
1.14c : 
845(2) 
1.090 (3) 
1.165 (2) 
1,015 C2) 
>■: : 
675 (2) 
900 (2) 
1,225 (2) 
1.560 (2) 
1-230 (1) 
1,010 (2) 
:•■■ : 
912(3) 
975 (3 ; 
>ss : 
772 (21 
2.365 (2) 
1,560 (1) 
1,768 : 
1.170(3' 
1.150 (1) 
i. " : 
1.100 (2) 
1,010 (2) 
940(2) 
1,010 (3) 
=ss : 
672 (2) 
1,855 : 
! 585 : 
1.035 (2) 
1.370 (2) 
:.: r o 3 
1,142 (2) 
961 (3) 
750 (2 ) 
1.120 (2) 
::: : 
1,342 (2) 
1.222 (2*> 
1,082 : 
1.040 (2) 
i;040 (2) 
904(2) 
2.1S5 (2) 
1,795 (2) 
: P2: : 
1.065 (2) 
: .:;: : 
2.420 (2) 
2.750 (2) 
: : 
2,020- 
1.955. 
1'. S15 . 
1,385 . 
l • . 
1,710. 
1.290. 
1.057. 
1.955 (3'. 
1,715 (2) 
1,690 (2) 
1,400 (2) 
'995 (21 
1.535(2) 
1.030 (2) 
1,705 (2) 
1.S30 (3) 
i,:: : 
:.,;■ : 
1,380 (2) 
1.115 (21 
: \ . 
2.330 (2) 
2.3-55 (2) 
1,485 : 
5,28 . 
3.430 (2) 
3.270 2) 
:.-;: : 
2.170 (3) 
1 :v S 
1..S35 (2) 
1,440 (3) 
1J45 (31 
1.670 (3) 
1.120 (3) 
1,890 (2) 
2.410 (3) 
1,715 (3) 
1.490 (3) 
1,382(3) 
1.230 (3) 
2.950 (2) 
2.250 (2) 
2.750 (21 
1.625 (21 
3.3-30 (21 
3,390 (2) 
3.110 (2) 
3.020 (3) 
2.205 (2) 
1.900 (2) 
1,865 (2 
1.5 So (2) 
1.975 (2) 
2,300 (2) 
2.250 (2) 
1,805 (2) 
1.4S0 (3) 
1.680 (3) 
1,130 (2) 
2.850 (2) 
2.700 (2) 
2', $00 (2) 
1,568 . 
3.370 (2) 
3.130 (2) 
3.160 (2) 
N oiz.— rieures in parentheses indicate number of specimens tested. Gravel used as coarse aggregate 
inNos. -.'- 18 . 481, 482, 796, T. '. 798, 799- Crushed gneiss used in all other teste. 
TIME OF SETTING OE PORTLAND CEMENT. 
Table S. — Effect of oil on time of setting. 
Oil No. 4923. 
Per cpnt 
of ofl. 
InitirJ set 
Final set. 
H.m. 
1 IS 
1 31 
1 57 
H.m. 
3 43 
4 56 
5 27 
The time of setting is delayed with the addition of oil, as shown 
by the above tests, which are plotted on figure -±. These results 
were obtained with the Gilhnore needles on specimens subjected to 
identical conditions while hardening. Five per cent of oil delays 
the initial set by 50 per cent and the final set by 47 per cent. 
TOUGHNESS OR RESISTANCE TO IMPACT. 
The toughness or resistance to impact was tested on the Page 
impact machine under the blows of a 10-kilogram hammer falling on 
a 5-kilogram plunger from successively increasing heights of 1 centi- 
meter. The height of the blow causing failure corresponds to the 
number of blows. The end of the plunger in contact with the 
