18 
BULLETIN 230. IT. S. DEPARTMENT OP AGRICULTURE. 
The foregoing results are plotted on figure 1. It will be noticed 
that, in general, the specimens containing oil have a higher tensile 
strength than those without oil. 
CRUSHING STRENGTH. 
Specimens of mortar and concrete containing different percentages 
of various kinds of oils were molded 6 inches in diameter and 6 inches 
high. They were bedded in plaster of Paris and blotting paper, and 
crushed at a speed of 0.152 inch per minute. Table 6 gives the 
crushing strength of 1:3 oil-mortar specimens for periods of 28, 180, 
and 360 days; and Table 7, the crushing strength of oil-concrete 
cylinders tested at various periods up to two years. The results are 
plotted on figures 2 and 3. It will be noted that the crushing strength 
is decreased by the addition of oil, but that the decrease is not serious 
when the amount of oil does not exceed 10 per cent. It will also be 
noted that oil-mixed cement concrete gains in strength with time 
in about the same ratio as untreated concrete. This fact indicates 
that the addition of oil to the' mixture in small amounts has no 
disintegrating effect on the cement. This statement holds true for 
periods up to and including two years. 
Table 6. — Compression test of oil-mortar 6 by 6 inch cylinders, proportions 1:3 by weight. 
Specimen 
Per 
cent 
of oil. 
Oil No. 
Air cured. 
Water cured. 
No. 
28 days. 
180 days. 
360 days. 
28 days. 
180 days. 
360 days. 
1 

5 
10 
15 
20 
5 
10 
15 
20 
5 
10 
15 
20 
5 
10 
15 
20 
5 
10 
15 
20 
1,170(5) 
1,050(2) 
790(1) 
895 (2) 
775 (2) 
915(2) 
830(1) 
1,215(2) 
935 (2) 
1,405(2) 
1,070(1) 
975 (2) 
795 (2) 
1,305(2) 
1,170(1) 
1,440(2) 
925 (2) 
1,010(2) 
980 (2) 
1,055(2) 
890 (2) 
1,350(2) 
830 (2) 
1,597(2) 
1,220(2) 
2,135(6) 
1,715(2) 
1,320(1) 
1,290(2) 
1,020(2) 
1,770(2) 
2,400(2) 
1,775(2) 
1,345(2) 
1,995(2) 
1,720(1) 
1,670(2) 
1,400(2) 
2,220(2) 
1,750(1) 
1,895(2) 
1,230(2) 
1,760(2) 
1,680(2) 
1,265(2) 
1,175(2) 
. 2,275(2) 
2,160(2) 
1 
2,30S(2) 
2, 240 (2) 
17 
4145 
4145 
4145 
4145 
4146 
4146 
4146 
4146 
4147 
4147 
4147 
4147 
4149 
4149 
4149 
4149 
4170 
4170 
4170 
4170 
2 
22 
780 (2) 
910 (2) 
880 (2) 
1, 125 (2) 
1,110(2) 
1,615(2) 
1,420(2) 
1, 700 (2) 
27 
1, 425 (2) 
18 
2, 560 (2) 
3. 
23 
1,275(2) 
1,295(2) 
1,155(2) 
1,670(2) 
1,380(2) 
1,715(2) 
2,410(2) 
1,640(2) 
2,475(2) 
2,475(2) 
28 
1, 780 (2) 
2, 700 (2) 
19 
4. . 
24 
1,085(2) 
1,055(2) 
1,105(2) 
1,435(1) 
1,310(2) 
1,395(2) 
2,350(2) 
2,010(2) 
2,655(2) 
2,250(1) 
29 
1,895(2) 
2,450(1) 
21 
6 
26 
1,395(2) 
1,085(2) 
'940(2) 
1,005(2) 
1,170(2) 
1,220(2) 
1,330(2) 
1,135(2) 
1,315(2) 
1,510(2) 
1.555(2) 
1,325(2) 
2,215(2) 
1,475(2) 
2,065(2) 
1,825(2) 
1,365(2) 
1,340(2) 
2,320(2) 
1,530(2) 
2,345(1) 
31 
7 
8 
2,200(1) 
1,685(1) 
1,375(1) 
9 
10 s . 
Note. — Numbers in parentheses indicate number of specimens tested. 
