SPECIFICATIOlSrS FOR BITUMINOUS ROAD MATERIALS. 59 



appearance or general character. (3) When the material is fluxed or main- 

 tained in heating kettles at an elevated temperature for periods of over 12 

 hours at least one sample should be taken and tested for consistency each day 

 during its use. 



INFORMATION ACCOMPANYING SAMPLES. 



Whenever possible the following inforination should l)e furnished the labo- 

 ratory in connection with each sample submitted. 



1. Identification mark. 



2. Name of material. 



3. Name and address of producer. 



4. To be examined for conformity with specification. 



5. Name and location of road where material is to be used. 



6. Proposed method of use or type of construction in which material is to be 

 used. 



7. Date sample taken. 



8. Place sample taken. 



9. Sample taken from (storage tank, tank car, barrel, drum, distributor or 

 heating kettle). 



10. Material shipped in (car No. — , Tank car No. — , barrels, drums, auto- 

 mobile distributor, or tank wagon ) . 



11. Date shipped. 



12. Date received at destination. 



13. Date used or to be used if satisfactory. 



TIME AND PLACE OF SAMPLING. 



(1) Whenever practicable bituminous materials should be sampled at the 

 point of manufacture, and at such time as to allow the tests, controlling ac- 

 ceptance or rejection, to be made in advance of shipment. (2) When imprac- 

 ticable to take samples at point of manufacture they should be taken from 

 the shipment immediately upon delivery. 



SIZE OF SAMPLES. 



Samples of not less than one quart should be taken except that 3-ounce 

 samples of asphalt cement or refined tar may be taken when the only test to 

 be made is the penetration test or float test, as covered by direction No. 3 

 under "Frequency of Sampling." 



CONTAINERS. 



(1) Containers for liquid bituminous materials should be 1-quart, small- 

 mouth cans with screw cap or cork stopper. (2) Containers for semisolid and 

 solid materials should preferably be 1-quart friction-top cans. (3) Samples of 

 asphalt cement or refined tar which are to be subjected only to the penetra- 

 tion test or float test may be sent in 3-ounce round tin boxes with tight-fitting 

 cover. 



IDENTIFICATION OF SAMPLES. 



(1) Th6 container for each sample should carry a suitable mark which will 

 clearly identify it in connection with additional information which should be 

 furnished the laboratory. (2) For marking tin cans, a 10 per cent solution of 

 silver nitrate may be used, provided the marking is allowed to thoroughly dry 

 l)efore the sample is packed. (3) Gummed labels may be used if the outside 

 of the can is first scraped so as to present a rough surface upon which the 

 label may be securely attached. 



DRIP SAMPLES. 



When loading tank cars, barrels, or drums from a storage tank, cooler, or 

 still, drip samples may be taken. The material should be allowed to flow 



