The Chemistry And Testing of Cement
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THE PHYSICAL PROPERTIES 139 commercial Portland cement is considerably in excess of that required by the specifications. Cement is readily obtainable from a number of English firms which leaves a mere trace of residue on the 76 sieve, and from 10 down to 5 per cent, or even less on the 180 sieve. The same is true of the products of the best Continental works. Practi- cally the whole of the German cements examined at Gross- Lichterfelde during 1909 fulfilled the requirements as regards fineness,... the residue on the coarser of the two sieves being usually under 1 per cent. 1 One fifth of the Swiss cements examined at Zurich during 1908 left under 5 per cent, residue on the finer sieve. 2 In order to determine the proportion of the finest, and therefore most valuable, particles in a cement, tests are occasionally made with still finer sieves. Thus, in certain laboratories, it is the practice to test all samples with a sieve having 200 meshes per linear inch (40000/in. 2 or 6200/cm. 2 ) or 236 meshes per linear inch (55696/in.
What to read after The Chemistry And Testing of Cement?
You can find similar books in the "Read Also" column, or choose other free books by Cecil H Cecil Henry Desch to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
THE PHYSICAL PROPERTIES 139 commercial Portland cement is considerably in excess of that required by the specifications. Cement is readily obtainable from a number of English firms which leaves a mere trace of residue on the 76 sieve, and from 10 down to 5 per cent, or even less on the 180 sieve. The same is true of the products of the best Continental works. Practi- cally the whole of the German cements examined at Gross- Lichterfelde during 1909 fulfilled the requirements as regards fineness,... the residue on the coarser of the two sieves being usually under 1 per cent. 1 One fifth of the Swiss cements examined at Zurich during 1908 left under 5 per cent, residue on the finer sieve. 2 In order to determine the proportion of the finest, and therefore most valuable, particles in a cement, tests are occasionally made with still finer sieves. Thus, in certain laboratories, it is the practice to test all samples with a sieve having 200 meshes per linear inch (40000/in. 2 or 6200/cm. 2 ) or 236 meshes per linear inch (55696/in.
What to read after The Chemistry And Testing of Cement?
You can find similar books in the "Read Also" column, or choose other free books by Cecil H Cecil Henry Desch to read onlineMoreLess
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