630 



CEMENTS, LIMES, AND PLASTERS. 



uniform conditions possible, and rapid changes of temperature should 

 be avoided. 



9. The failure to meet the requirements of the accelerated tests 

 need not be sufficient cause for rejection. The cement may, however, 

 be held for twenty-eight days and a retest made at the end of that period. 

 Failure to meet the requirements at this time should be considered 

 sufficient cause for rejection, although in the present state of our knowl- 

 edge it cannot be said that such failure necessarily indicates unsound- 

 ness, nor can the cement be considered entirely satisfactory simply 

 because it passes the tests. 



STANDARD SPECIFICATIONS FOR CEMENT. 



1. General conditions. All cement shall be inspected. 



2. Cement may be inspected either at the place of manufacture 

 or on the work. 



3. In order to allow ample time for inspecting and testing, the cement 

 should be stored in a suitable weather-tight building having the floor 

 properly blocked or raised from the ground. 



4. The 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 twelve 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 Ibs. 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 seven-day requirements may be held 

 awaiting the results of the twenty-eight-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, presented to the society Jan. 21, 1903, and amended 

 Jan. 20, 1904, with all subsequent amendments thereto. 



10. The acceptance or rejection shall be based on the following 

 requirements : 



PORTLAND CEMENT. 



18. Definition. This term is applied to the finely pulverized product 

 resulting from the calcination to incipient fusion of an intimate mixture 

 of properly proportioned argillaceous and calcareous materials, and ta 



