OIL-MIXED PORTLAND CEMENT CONCRETE. 



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 in 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. 



on 



(percent). 









3 

 5 



{ £ 



{ £ 



5 



{ £ 



{ £ 



8.31 

 3.32 



} 2.48 



]• 1.98 



1.57 



| 1.30 



} ,u 







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 



2£ 

 3 





0.93 



1.05 



1.11 



.44 

 .46 



.47 













4.' 



5 



6 



0.88 

 .92 



.94 



1 One barrel of cement equals 4 bags. 



Oil weighs about 1\ 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 



88768°— Bull 230—15 2 



