103 



1 Cement, 2 Sand 



1 Cement, 3 Sand 



in. 

 in. 

 in. 

 in. 

 in. 



139 

 208 

 140 

 187 

 280 



A 1:2 mortar of natural cement has about the same 

 strength that a 1 :4 or 5 Portland cement mortar, and 

 shows the following difference in price: 



Portland Cement Mortar. 

 0.92 cu. yd. sand at $1.25 ...................... $1.15 



1.12 bbls. cement at $2.50 ...................... 2.80 



$3.95 



Natural Cement Mortar. 

 0.81 cu. yd. sand at $1.25 ...................... $1.01 



2.49 bbls. cement at $0.90 ...................... 2.24 



COLORING OF CONCRETE. 



Dry mineral colors affect the cement least and are con- 

 sequently used and are mixed according to the following 

 table: 





