672 CEMENTS, LIMES, AND PLASTERS. 



Specifications for slag cement. So far as known, the only American 

 specifications for slag cement are those prepared and published in 

 1902 by the Engineer Corps, U. S. Army. These are reprinted below. 



SPECIFICATIONS FOR PUZZOLAN CEMENT. 

 Engineer Corps, U. S. A., 1902. 



(1) The cement shall be a Puzzolan of uniform quality, finely and 

 freshly ground, dry, and free from lumps, made by grinding together 

 without subsequent calcination granulated blast-furnace slag with 

 slaked lime. 



(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 given satisfaction in use under climatic or other conditions of 

 exposure of at least equal severity to those of the work proposed, and 

 for any brand from cement works that do not make and test the slag 

 used in the cement. 



(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 Puzzolan cement which have been in successful use under 

 similar climatic conditions to those of the proposed work and which 

 come from cement works that make the slag used in the cement.) 



(5) The average weight per barrel shall not be less than 330 Ibs. 

 net. Four sacks shall contain 1 barrel of cement. If the weight as 

 determined by test weighings is found to be below 330 Ibs. per barrel, 

 the cement may be rejected, or, at the option of the engineer officer 

 in charge, the contractor 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. 



