OIL-MIXED PORTLAND CEMENT CONCRETE. 
9 
In a machine mixer the cement, sand, and water are first mixed 
to a mortar, when alternate batches of oil and stone are added until 
the required quantity of oil is mixed, and then the remainder of the 
stone is added and mixed. When a batch mixer is used, the exact 
method of procedure should be determined by experiment, owing to 
the fact that different makes of mixers require slightly different 
handling to insure best results. A continuous mixer should not be 
used hi oil-cement-concrete work, as with this type the time of mix- 
ing can not readily be increased to the extent necessary to insure a 
uniform distribution of the oil. 
MATERIALS REQUIRED FOR 1 CUBIC YARD. 
The following table gives the proportions by parts and amounts 
required of cement, sand, stone, and oil to make a cubic yard of oil- 
mixed mortar and concrete: 
Table 2. — Quantities of materials required for 1 cubic yard of oil-mixed mortar and 
concrete. 
Proportions by parts. 
Cement 
(barrels 1 ). 
Sand 
(cubic 
yards). 
Stone or 
gravel 
(cubic 
yards). 
Oil 
(gallons 2 ). 
Cement. 
Sand. 
Stone or 
gravel. 
Oil 
(percent). 
1 
1 
1 
1 
1 
1 
1 
3 
5 
{ > 5 o 
{ & 
5 
{ iS 
{ l! 
8.31 
3.32 
} 2.48 
} 1.98 
1.57 
} 1.30 
} in 
12.1 
8.06 
/ 6.02 
\ 12.04 
f 4.8 
\ 9.61 
3.81 
/ 3.15 
\ 6.3 
/ 2.69 
\ 5.38 
2 
3 
4 
2 
24 
3 
0.93 
1.05 
1.11 
.44 
.46 
.47 
4 
5 
6 
0.88 
.92 
.94 
One barrel of cement equals 4 bags. 
2 Oil weighs about 7J pounds per gallon. 
USES. 
All of the laboratory and service tests thus far made on oil-mixed 
mortars and concretes are indicative of a wide future usefulness for 
these materials, principally in damp-proof construction. There are 
many types of structures through which the permeation of moisture 
is ruinous to either the appearance or the efficiency of the construc- 
tion, or is seriously detrimental to the health of either animal or 
human life. The efflorescence due to the leaching out and subsequent 
carbonization of the lime on the surface of a concrete wall might 
well be prevented by the incorporation of an agent capable of ex- 
cluding all moisture. Again, the dampness of many cellars, with its 
danger to health, could have been prevented had the walls and floors 
been damp-proofed. The following types of structures might be 
damp-proofed at an exceedingly slight extra expense by the incorpo- 
ration of a small amount of the proper kind of mineral oil residuum 
SN7 
-Bull 230—11 
