STRENGTH OF CEMENT MORTAR AND CONCRETE. 



305 



Table II. 



Composition. 



1 cement to 28 

 3 sand 



1 cement to 

 3 sand 



1 cement to 

 3 sand 



1 cement to 

 3 sand 



1 cement to 

 3 sand 



1 cement to 

 3 sand 



1 cement to 

 3 sand 



Total load 

 in pounds. 



Tensile stress 



in pounds 

 per sq. inch. 



28 



28 



28 



90 



90 



90 



912 

 204S 

 3120 

 3568 



1072 

 2240 

 3472 

 4048 



1088 

 3104 

 5552 



8592 



880 

 1920 

 2960 

 3520 



800 

 2400 

 3632 

 4464 



1040 



3088 

 5280 

 7696 



1120 



2368 

 4304 



57 

 128 

 195 

 223 



67 

 140 

 217 

 253 



68 

 194 

 347 

 537 



55 

 120 

 185 

 220 



50 

 150 



227 

 279 



65 

 193 

 330 



481 



70 

 148 

 269 



Extensions 

 00004 inches. 



1-0 



5-0 



10-0 



12-0 



1-0 



5-0 

 100 

 12-0 



1-0 



50 



100 



160 



1-0 



50 



10-0 



16-0 



10 



50 

 10-0 

 14-0 



10 

 50 



100 

 16-0 



1-0 



50 



100 



Coefficients of 

 Elasticity in 

 lbs. per sq. in. 



Breaking 

 load lbs. 

 per sq. in. 



2575000 

 1935000 

 1637500 

 1597900 



244 



3575000 

 2175000 

 1857500 

 1847000 



285 



3675000 

 3255000 

 3157500 

 3160800 



575 



2375000 

 1775000 

 1537500 

 1179600 



218 



1875000 

 2375000 

 1957500 

 1769600 



301 



3375000 

 3235000 

 2987500 

 2810900 



516 



3875000 

 2335000 



2379000 



281 



T— Dec. 3. 1902. 



