119 



Ing, the cement should be stored in a suitable weather- 

 tight building having the floor properly blocked or raised 

 from the ground. 



4. Th cement shall be stored in such a manner as to 

 permit easy access for proper inspection and identification 

 of each shipment. 



5. Every facility shall be provided by the contractor 

 and a period of at least 12 days allowed for the inspection 

 and necessary tests. 



6. Cement shall be delivered in suitable packages with 

 the brand and name of manufacturer plainly marked 

 thereon. 



7. A bag of cement shall contain 94 Ib. of cement 

 net. Each barrel of Portland cement shall contain 4 bags, 

 and each barrel of natural cement shall contain 3 bags 

 of the above net weight. 



8. Cement failing to meet the 7-day requirements may 

 be held awaiting the results of the 28-day tests before 

 rejection. 



9. All tests shall be made In accordance with the 

 methods proposed by the Committee on Uniform Tests of 

 Cement of the American Society of Civil Engineers, pre- 

 sented to the Society January 21, 1903, and amended 

 January 20, 1904, with all subsequent amendments thereto. 

 (See addendum to these specifications.) 



10. The acceptance or rejection shall be based on the 

 following requirements: 



NATURAL CEMENT. 



11. Definition. This term shall be applied to the finely 

 pulverized product resulting from the calcination of an 

 argillaceous limestone at a temperature only sufficient to 

 drive off the carbonic acid gas. 



Specific Gravity. 



12. The specific gravity of the cement thoroughly dried 

 at 100 C., shall be not less than 2.8. 



Fineness. 



13. It shall leave by weight a residue of not more than 

 10% on the No. 100, and 30% on the No. 200 sieve. 



Time of Setting. 



14. It shall develop initial set in not less than 10 min- 

 utes, and hard set in not .less than 30 minutes, nor more 

 vthan 3 hours. 



