OC-2. ROAD OIL FOR COLD APPLICATION. 



The road oil shall be homogeneous and free from water. General. 



It shall meet the following requirements : 



1. Specific gravity 25V25°C. (TTV77°F.)— - 0.935 to 0-9T0 i;^ y ^«/^5 a 1^ and 



2. Fash point not more than oO°C. (122°F.) erties. 



3. Specific viscosity at 25°C. (77°F.) 80 to 120 



4. Loss at 163°C. (325°F.), 5 hours not more than 30% 



a. Float test of residue at -50° C. (122° F.), 



not less than 90 sec. 



5. Total bitumen (soluble in carbon disulphide), 



not less than 99.5% 



6. Per cent of total bitumen insoluble in 86°B. naphtha, 



not less than 6.0% 



Tests of the phvsical and chemical properties of the road oil Methods of test- 



ing. 

 shall be made in accordance with the following methods : 



1. Specific gravity, U. S. Department of Agriculture Bulletin 



314, p. 4. 



2. Flash point (open cup), U. S. Department of Agriculture 



Bulletin 314, p. 17. 



3. Specific viscosity (on first 50 c.c), U. S. Department of 



Agriculture Bulletin 314, p. 7. 



4. Volatilization test (loss at 163°C.), U. S. Department of 



Agriculture Bulletin 314, p. 19. 



a. Float test, U. S. Department of Agriculture Bulletin 

 314. p. 9. 



5. Total bitumen, U. S. Department of Agriculture Bulletin 



314, p. 25. 



6. Bitumen insoluble in naphtha. U. S. Department of Agri- 



culture Bulletin 314, p. 28. 



This specification provides primarily for a material to be used 

 in the cold surface treatment of macadam or shell roads to form 

 a thin wearing mat or carpet which may be maintained or built 

 up by subsequent treatments of either the same type of material 

 or a heavier product (specification OH-1). The specification is 

 intended to cover certain types of crude or topped petroleums 

 and cut-back oil asphalts. 



A successful treatment requires that the road surface shall 

 be in a good state of repair, well consolidated, free from holes 

 or depressions, and thoroughly swept for the removal of dust 

 and detritus before the application is made. Newly constructed 

 roads should be permitted to consolidate under traffic before 

 the oil is applied. The oil may be applied without heating, and 

 the initial applications should be made by means of a pressure 

 distributer at the rate of from one-third to one-half a gallon per 

 square yard. It should be covered with a uniform layer of dust- 

 less broken stone, all of which will pass a one-half or three- 



