STRENGTH OF CEMENT MORTAR AND CONCRETE. 



299 



45 inches, loaded in the centre (Fig. 14); the deflections 

 produced by the various loads were measured by means of 

 sector deflectometers, reading to -h- mm. directly, or tAt 

 of an inch, attached to each side of the beam in the centre. 

 Four beams were tested when reinforced with steel rods 

 half inch in diameter on the tension side, and four were 

 tested without any reinforcement in order to compare the 

 one with the other. 



The results are recorded in Tables V. and VI., and in 

 figs. 15 and 16, from which it will be seen that the strength 



3000 



1 



3 4 



6 7 8 9 10 11 12 13 

 Deflections in 0"004 inch. 



14 15 16 17 18 19 20 



Fig. 15 — Transverse Tests of Mortar Beams, containing three half 

 inch steel bars. 



No. 1 — One Hemmoor Cement to three Emu Plains sand ; age 159 days 

 » % — » » >> >, ,, », 161 ,, 



3— 



4— 



187 

 192 



is increased by the steel rods from 5J to 10 times that of 

 the plain beams not reinforced. Again, the reinforced 

 beams are able to deflect much more than the plain beams 

 without fracture. 



