

APPENDIX B. 335 



SPECIFICATIONS FOR AMERICAN PORTLAND CEMENT* 



1. The cement shall be an American Portland, dry and free from lumps. By a 

 Portland cement is meant the product obtained from the heating or calcining up to 

 incipient fusion of intimate mixtures, either natural or artificial, of argillaceous with cal- 

 careous substances, the calcined product to contain at least 1.7 times as much of lime, 

 by weight, as of the materials which give the lime its hydraulic properties, and to be 

 finely pulverized after said calcination, and thereafter additions or substitutions for 

 the purpose only of regulating certain properties of technical importance to be allow- 

 able to not exceeding 2 per cent of the calcined product. 



2. The cement shall be put up in strong, sound barrels well lined with paper, so 

 as to be reasonably protected against moisture, or in stout cloth or canvas sacks. Each 

 package shall be plainly labeled with the name of the brand and of the manufacturer. 

 Any package broken or containing damaged cement may be rejected or accepted as a 

 fractional package, at the option of the United States agent in local charge. 



3. Bidders will state the brand of cement which they propose to furnish. The 

 right is reserved to reject a tender for any brand which has not established itself as a 

 high-grade Portland cement and has not for three years or more given satisfaction in 

 use under climatic or other conditions of exposure of at least equal severity to those 

 of the work proposed. 



4. Tenders will be received only from manufacturers or their authorized agents. 

 (The following paragraph will be substituted for paragraphs 3 and 4 above, when 



cement is to be furnished and placed by the contractor: 



No cement will be allowed to be used except established brands of high-grade Port- 

 land cement which have been made by the same mill and in successful use under similar 

 climatic conditions to those of the proposed work for at least three years.) 



5. The average weight per barrel shall not be less than 375 pounds net. Four 

 sacks shall contain one barrel of cement. If the weight, as determined by test weigh- 

 ings, is found to be below 375 pounds per barrel, the cement may be rejected, or, at the 

 option of the Engineer Officer in charge, the ontractor may be required to supply, 

 free of cost to the United States, an additional amount of cement equal to the shortage. 



6. Tests may be made of the fineness, specific gravity, soundness, time of setting, 

 and tensile strength of the cement. 



7. Fineness. Ninety-two per cent of the cement must pass through a sieve made 

 of No. 40 wire, Stubb's gauge, having 10,000 openings per square inch. 



8. Specific Gravity. The specific gravity of the cement, as determined from a 

 sample which has been carefully dried, shall be between 3.10 and 3.25. 



* These specifications for Portland, Natural, and Puzzolan cements are the standards of the Engineer 

 Department, U. S. Army, and are reprinted from the Report of the Board of Engineer Officers on testing 

 Hydraulic Cements, June, 1901. (Professional Papers, Corps of Engineers, U. S. Army, No. 28.) 



