xiii, A, 1 Witt: Cement and Concrete 33 



Carbon dioxide (aqueous solution). N. Ljamin, Journ. Soc. Chem. Ind. 

 (1902), 21, 972. 

 A pronounced accelerating eflfect is noted, though the solubility of the 

 gas in water is low. 



Carbon dioxide. C. Montemartini, Journ. Soc. Chem. Ind. (1908), 27, 228. 

 When dry, cement is treated with a current of dry carbon dioxide; no 

 change is apparent. 



Ferrous sulphate. French patent 408,060, Journ. Soc. Chem. Ind. (1910), 

 29, 631. 

 The addition of 1 to 3 per cent ferrous sulphate is said to quicken the 

 set and increase the strength. 



lithium chloride. P. Rohland, Ber. d. deutsch. chem. Ges. (1901), 33, 2831. 

 There is no effect. 



Magnesium chloride. Dobrzynski, Journ. Soc. Chem. Ind. (1892), 11, 525. 

 The concentration of the solutions was from 1 to 6 per cent. The lower 

 percentages causes a slight increase in tensile strength, while the 

 higher ones causes a slight decrease. 



Magnesium chloride. 0. von Blaese, Journ. Soc. Chem. Ind. (1907), 26, 19. 

 The maximum setting time is obtained with 6 per cent of the salt. 



Potassium aluminium sulphate. L. Perrin, Journ. Soc. Chem. Ind. (1906), 

 25, 812. 

 When cement is mixed with 1.54 per cent of the salt, the setting time 

 is unchanged. The author believes that the presence of aluminium 

 is responsible for the negative effect. 



Potassium carbonate. N. Ljamin, Journ. Soc. Chem. Ind. (1902), 21, 972. 

 No comments are made. 



Potassium dichromate. P. Rohland, Ber, d. deutsch. chem. Ges. (1901), 33, 

 2831. 

 The set is retarded. No details are given. 



Potassium dichromate. P. Rohland, Journ. Soc. Chem. Ind. (1909), 28, 23. 

 The set is retarded. 



Potassium sulphate. P. Rohland, Zeitschr, f. angew. Chem. (1903), 16, 1049. 

 The set is retarded or accelerated, depending on conditions. 



Sodium bisulphite. H. Luftschitz, Tonind-Zeitg. (1913), 37, 1986. 



The salts were mixed with cement in various proportions from 0.5 to 

 4 per cent, and tests were made for tensile and compressive streng^th. 

 The strength of the specimens decreases with increased amount of 

 salts. 



Sodium borate. P. Rohland, Ber. d. deutsch. chem. Ges. (1901), 33, 2831. 

 The set is retarded. No details are given. 



Sodium borate. P. Rohland, J<3urn. Soc. Chem. Ind. (1909), 28, 23. 

 The set is retarded. 



151772 3 



