APPENDIX. 
PHYSICAL TESTS OF OIL-MIXED PORTLAND-CEMENT CONCRETE. 
In order to investigate the physical properties of oil-mixed Port- 
land-cement concrete, the following physical tests were conducted hi 
the testing laboratory of the Office of Public Roads: (1) Tensile 
strength, (2) crushing strength, (3) time of setting, (4) toughness or 
resistance to impact, (5) stiffness or modulus of elasticity, (6) absorp- 
tion, (7) permeability, and (8) bond tests. 
SrrscT of O/i. on Tens/le 
Strength or /j Mo/vax 
(Ottawa Sano} 
Age. 
7 Days 
28 Days. 
6 Mo/ytms. 
/ Y£Afi. 
2 yjTAfiS 
I 
— ■ 
f"" 
"~"~- 
>-~"'"" 
__—■ < 
> 
O/l Ab. S053 
■ *i 
y 
y 
* 
y 
«-4 
< 
>-- —-—~ 
O/L- 
No. 6464 
O/l /Vo. 7393, 
/C Q 
Per cent of oil. 
Fig. 1.— Effect of oil on tensile strength of 1 : 3 mortar. 
The materials used consisted of Portland cement, river sand, 
crusher-run gneiss, river gravel, and various kinds of petroleum 
residuum oils. 
The mechanical analysis of the sand, stone, and gravel used is 
given below 
Table 3. — Mechanical analysis of sand, stone, and gravel. 
10 
Sand. 
Stone. 
Gravel. 
Sieve 
Per cent 
Sieve 
Per cent 
Sieve 
Per cent 
No. 
retained. 
No. 
retained. 
No. 
retained. 
Inch. 
Inch. 
} inch 
3 
a 
2S.4 
1 
4.2 
| inch 
11 
i 
66.3 
a 
8.4 
10 
17 
i 
92.1 
i 
30.2 
20 
42 
| 
98.4 
i 
80.2 
30 
66 
I 
97.7 
40 
87 
50 
93 
SO 
96 
100 
99 
