Standard Specifications And Tests for Portland Cement of the American Society Fo
Standard Specifications And Tests for Portland Cement of the American Society Fo
Portland Cement Association
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3 gives the percentage of sulfuric anhydride. The acid filtrate obtained in the determination of the insoluble residue may be used for the estimation of sulfuric anhydride instead of using a separate sample. Permissible 25. A permissible variation of 0. 10 will be allowed, and all Variation. Resu it s in excess of the specified limit but within this permissible variation shall be reported as 2. 00 per cent. MAGNESIA. Method. 26. To 0. 5 g. Of the cement in an evaporating dish shall be added 10 ...cc. Of water to prevent lumping and then 10 cc. Of concentrated hydrochloric acid. The liquid shall be gently ! heated and agitated until attack is complete. The solution shall then be evaporated to complete dryness on a steam or water bath. To hasten dehydration the residue may be heated to 150 or even 200 C. For one-half to one hour. The residue shall be treated with 10 cc. Of concentrated hydrochloric acid diluted with an equal amount of water. The dish shall be SPECIFICATIONS AND TESTS FOR PORTLAND CEMENT.
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