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CEMENT.
CEMENT.
Investigative work has been conducted with different brands of cements under the following heads:
Chemical analyses of composition of the material and cement rock. Fineness of grinding.
Specific gravity.
Determination of water and carbon dioxide in the material after hydration.
Rate of setting.
Temperature acquired during setting.
Retarded sets.
Behavior during mixing of material with and withouta “restrainer.” Absorption of water by grout mixtures and compressive tests.
Loss in weight of grouts set in air.
Material which set in air at different temperatures.
Strength after exposure to higher temperatures.
Tests on tensile and compressive strength.
The following brands were used in these tests:
Brand.	Class.	Location of works.
Alpha			Easton, Pa. Northampton, Pa. West Coplay, Pa. Siegfried, Pa. Akron, N. Y. Cementon, Pa. Germany. Do. Belgium. Chicago, 111. New York. Do. Akron, N. Y. Mankato, Minn. Siegfried, Pa. Rosendale, N. Y. Mankato, Minn. Whiteport, N. Y. Binnewater, N. Y. Akron, N. Y.
Atlas			
Lehigh			
Star			
Storm King			
Whitehall			
Alsen			
Dyckerhoff			
Josson			
Steel 		Slag		
Cathedral			
Silica			
Akron Star			
Austin	«...		
Bonneville Improved			do		
Hoffman			
Mankato			
Newark and Rosendale ...		
Norton			
Obelisk			
Potomac