Professional Papers of the Corps of Engineers of the United States Army

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Page 31 - The cement shall be considered to have acquired its initial set when the pat will bear, without appreciable indentation, the Gillmore Mm I needle ^ in.
Page 31 - The pats made to test the soundness may be used in determining the time of setting. The cement is considered to have acquired its initial set when the pat will bear, without being appreciably indented, a wire one-twelfth...
Page 32 - ... (14) The above are to be considered the minimum requirements. Unless a cement has been recently used on work under this office, bidders will deliver a sample barrel for test before the opening of bids. If this sample shows higher tests than those given above, the average of tests made on subsequent shipments must come up to those found with the sample.
Page 33 - ... 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 Portland 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.
Page 30 - By a Portland cement is meant the product obtained from the heating or calcining up to incipient fusion of intimate mixtures, either natural or artifical, of argillaceous with calcareous 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...
Page 33 - A cement may be rejected in case it 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...
Page 36 - 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. (4) Tenders will be received only from manufacturers or their authorized...
Page 35 - ... per cent of water by weight. After being thoroughly mixed and worked for five minutes, the cement or mortar...
Page 34 - If the weight, as determined by test weighings, 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 contractor may be required to supply, free of cost to the United States, an additional amount of cement equal to the shortage.
Page 36 - ... 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.

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