APPENDIX B. 339 



14. A cement may be rejected which fails to meet any of the above requirements. 

 An agent of the contractor may be present at the making of the tests, or, in case of the 

 failure of any of them, they may be repeated in his presence. If the contractor so desires, 

 the Engineer Officer may, if he deems it to the interest of the United States, have any 

 or all of the tests made or repeated at some recognized standard testing laboratory in 

 the manner above specified. All expenses of such tests shall be paid by the contractor, 

 and all such tests shall be made on samples furnished by the Engineer Officer from cement 

 actually delivered to him. 



SPECIFICATIONS FOR PUZZOLAN CEMENT. 



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 barrrels, 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 Puz- 

 zolan 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 pounds net. Four sacks 

 shall contain i barrel of cement. If the weight as determined by test weighings is found 

 to be below 330 pounds 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. 



7. Fineness. Ninety-seven 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. 



