SPECIFICATIONS FOR N-ONBITUMINOUS EOAD MATERIALS. 37 



than 10 pounds, for material containing fragments up to f-inch in diameter, 

 up to 60 pounds, depending on the size of tlie largest fragments present. 

 Shipment of samples should be made in tight boxes or close-woven cloth bags. 



SAND, 



Before approving a source of supply, samples of sand should be taken at 

 least 10 days prior to the date of acceptance or rejection. Pit samples should 

 be taken only from freshly exposed surfaces, and the number of samples from 

 any given deposit should be sufficient to cover the extreme range in quality of 

 that portion of the deposit which it is proposed to use. Every shipment of 

 sand for bituminous concrete, Portland cement concrete, or grouting should be 

 sampled, and no single composite sample should represent over 100 cubic yards. 

 Additional samples should be taken whenever the appearance of the sand 

 changes. In the case of sand for sheet asphalt, frequent samples should be 

 taken daily at the plant from the drum or bin. 



Samples of sand should weigh approximately 10 pounds. They should be 

 shipped in tight boxes, case, or close-woven cloth bags. 



MINERAL FILLER. 



Each shipment of mineral filler should be sampled. When shipped in bags 

 a composite sample should be prepared from one sample taken from each 20 

 ■bags in the shipment. A 1-pound sample may be submitted for examination 

 shipped in a tight box or can. 



TOTAL MINERAL AGGREGATES. 



When the grading of the total mineral aggregate for bituminous concrete 

 or binder course is specified frequent samples should be taken daily at the 

 plant from the drum or bin. Such samples should weigh approximately 10 

 pounds and if shipped should be placed in tight boxes or cans. 



SAND-CtAY OR TOP SOIL. 



Before approving a source of supply samples of natural sand-clay mixtures, 

 top soil, sand, or clay should be taken at least 10 days prior to the date of 

 acceptance or rejection. The number of samples from any given deposit should 

 be sufficient to cover the extreme range in quality of that portion of the 

 deposit which it is proposed to use. Additional samples should be taken 

 whenever the appearance of the material changes. When an artificial mixture 

 is made on the road fragment samples of the finished mix should be taken. 

 Samples should weigh approximately 10 pounds and if shipped should be 

 placed in tight boxes or cans. 



PORTLAND CEMENT. 



Either individual or composite samples of cement may be submitted. 

 Samples should be taken either at the mill or from cars. Individual samples 

 from cars should represent not more than 50 barrels. If taken from bins, 

 each sample should represent not more than 100 barrels. Composite samples 

 taken from cars should be made up of a sample from 1 sack in each 40 

 sacks, or 10 barrels combined to form one sample. Composite samples taken 

 at the mill may be either from the conveyor delivering to the bin, in which case 

 one sample of 8 pounds should be taken from each 100 barrels passing over; 



