XIII, A. 1 Witt : Cement and Concrete 31 



Calcium chloride. Chandlot, Journ. Soc. Chem. Ind. (1889), 8, 543. 

 The set was retarded. 



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

 The set was accelerated; no details are given. 



Calcium chloride. N. Ljamin, Journ. Soc. Chem. Ind. (1902), 21, 972. 

 Small amounts retard the set; large amounts accelerate it. 



Calcium chloride. P. Rohland, Zeitschr. f. angew. Chem. (1903), 16, 1049. 



A cement gauged with calcium chloride solutions from 11.10 per cent 



to 25.90 per cent showed constantly decreasing setting time. The 



maximum change was from nine hours and thirty minutes to five 



hours. 



Calcium chloride. R. C. Carpenter, Eng. Rec. (1904), 50, 7G9. 

 An addition of 0.5 per cent produced the greatest retardation. 

 This amount had no injurious effect on the ultimate strength. 



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

 The maximum retardation was produced with a 2 per cent solution. 



Calcium chloride. P. Rohland, Journ. Soc. Chem. Ind. (1909), 28, 23. 

 A small amount retards the set, but a large amount acceleiates it. 



Calcium chloride. Spielgeberg, Journ. Soc. Chem. Ind. (1909), 28, 1131. 

 The effect varies with the composition and general properties of the 

 cement. 



Calcium chloride. H. Burchartz, Journ. Soc. Chem. Ind. (1910), 29, 1108. 

 A small addition retards the set, while a larger one accelerates it. 

 Four samples which were mixed vdth 20 per cent of the salt failed 

 in soundness. 



Calcium chloride. O. Kallauner, Z. Betonbau (1914), No. 2; Mitt. Cent. 

 Ford. Deut. Port. Cement Ind., 3, 213. [Chem. Abst. (1914), 8, 

 2236.] 

 It decreases the strength. ' The author believes that all soluble calcium 

 salts decompose cement. 



Calcium chromate. P. Rohland, Ber. d. deutsch. chem. Ges. (1901), 33, 2831. 

 It retards the set. No details are given. 



Calcium hydroxide. R. C. Carpenter, Eng. Rec. (1904), 50, 769. 



Slaked lime (2 to 4 per cent), added to a cement which had become 

 quick setting, restored it to normal. 



Calcium nitrate. Chandlot, Journ. Soc. Chem. Ind. (1889), 8, 543. 

 The set is retarded. 



Calcium nitrate. 0. Kallauner, Z. Betonbau (1914), No. 2; Mitt. Cent. 

 Ford. Deut. Port. Cement Ind., 3, 213. [Chem. Abst. (1914), 8, 

 2236.] 

 There is a decrease in strength. 



Calcium oxychloride. F. Hauenschild, Journ. Soc. Chem. Ind. (1902), 21, 

 175. 

 The strength of specimens stored in air is increased, but the reverse is 

 true of specimens stored in water. 



