CORRUGATED BAR COMPANY, INC. 



AMERICAN SOCIETY FOR TESTING MATERIALS 



Philadelphia, Pa., U. S. A. 



affiliated with the 

 International Association For Testing Materials 



STANDARD SPECIFICATIONS FOR PORTLAND CEMENT 



adopted, 1904; REVISED, 1908, 1909, 1916, 1917. 



Portland cement is the product obtained by finely pulverizing clinker produced 

 by calcining to incipient fusion, an intimate and properly proportioned mixture of 

 argillaceous and calcareous materials, with no additions subsequent to calcination 

 excepting water and calcined or uncalcined gypsum. 



I. CHEMICAL PROPERTIES 

 Chemical Limits. The following limits shall not be exceeded: 



Loss on ignition, per cent 4 . 00 



Insoluble residue, per cent . 85 



Sulfuric anhydride (SO3), per cent 2.00 



Magnesia (MgO), per cent 5.00 



II. PHYSICAL PROPERTIES 



Specific Gravity. The specific gravity of cement shall be not less than 3.10 

 (3.07 for white Portland cement). Should the test of cement as received fall below 

 this requirement a second test may be made upon an ignited sample. The specific 

 gravity test will not be made unless specifically ordered. 



Fineness. The residue on a standard No. 200 sieve shall not exceed 22 per cent 

 by weight. 



Soundness. A pat of neat cement shall remain firm and hard, and show no signs 

 of distortion, cracking, checking, or disintegration in the steam test for soundness. 



Time of Setting. The cement shall not develop initial set in less than 45 minutes 

 when the Vicat needle is used, or 60 minutes when the Gillmore needle is used. Final 

 set shall be attained within 10 hours. 



Tensile Strength. The average tensile strength in pounds per square inch of not 

 less than three standard mortar briquettes composed of one part cement and three 

 parts standard sand, by weight, shall be equal to or higher than the following: 



The average tensile strength of standard mortar at 28 days shall be higher than 

 the strength at 7 days. 



III. PACKAGES, MARKING AND STORAGE 

 Packages and Marking. The cement shall be delivered in suitable bags or barrels 

 with the brand and name of the manufacturer plainly marked thereon, unless shipped 

 in bulk. A bag shall contain 94 lb. net. A barrel shall contain 376 lb. net. 



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