EMINENTLY HYDRAULIC LIMES: GRAPPIER CEMENTS. 



179 



TABLE 73. 

 ANALYSES OF HYDRAULIC LIME BEFORE SLAKING (TEIL, FRANCE). 



1. Average of lime burned from Alignole quarry rock. } Anal b Rivot> Quoted b Zwick 



2- " "Hydraulischer Kalk und Portland- 



- " Cement pp- 67 ' 69 - 



. 



5. Analysis by Vicat. Quoted by Beckwith, "Hydraulic Lime of Teil", p; 13. 



6. Quoted by Stanger and Blount, Mineral Industry, vol. 5, p. 70. 



7. Analysis by Vicat. Quoted by Beckwith, "Hydraulic Lime of Teil", p. 13. 



8. Analysis by Landrin. Quoted by Thorpe, "Dictionary Applied Chemistry", vol. 1, p. 483. 



9. Analysis by Michiielis. Quoted by Schoch, "Mortel-Materialen", p. 73. 



Two of the above analyses of Teil lime, Nos. 7 and 8, give exceptionally high values for the 

 Cementation Index. The average index of all nine samples is 0.913; if Nos. 7 and 8 be excluded 

 the average is 0.85. 



TABLE 74. 

 ANALYSES OF HYDRAULIC LIMES, FRANCE, GERMANY, AND ENGLAND. 



1. Senonches, France. Descotils, analyst. 



I! Hlusbe^^^ Kalk und 



4. Plassac, France. Vicat, analyst. Portland-Cement ", pp. 66-67. 



5. d'Emondeyille, France. Vicat, analyst. J 



6. Lyme Regis, England. Quoted by Cummings, "American Cements", p. 35. 



Slaking. Hydraulic lime, after burning, is a mixture of two distinct 

 compounds. Part of the mass is composed of lime silicate, which would 

 not slake if water were poured on it, but would form a hydraulic cement 

 if finely ground. The remainder of the hydraulic lime consists simply 

 of quicklime, which will slake with water. 



The result of the mixture of the two ingredients is that if water 

 be poured on a lump of hydraulic lime the portion consisting of quick- 

 lime will rapidly take up the water and slake. In its slaking its expan- 

 sion will break up the entire mass into a fine powder. If this operation 

 be done carefully, with just the proper amount of water, the result will 

 be a fine, dry, white powder, consisting mostly of lime silicate with 

 about one third to one fourth as much of slaked lime. 



