STRENGTH OF CEMENT MORTAR AND CONCRETE. 



301 



5000 



1000 

 Load in pounds. 



Fig. 17 — Transverse Tests of Mortar Beams, containing three-eighth 



inch iron rods. 



No. 1 — 1 Hemmoor Cement to 3 Nepean R. sand; 9 X 12 in., age 80 days. 



„ 2—1 „ „ 3 „ 9 X 8 in., „ 86 „ 



„ 3—1 „ „ 3 „ 9X6 in., „ 94 „ 



„ 4—1 „ „ 3 „ 9X4 in., „ 99 „ 



„ 5—1 „ „ 3 „ 9X2 in., „ 102 „ 



decreased in every case as the load was increased, as in 

 the foregoing series. 



A series of three tests were made in order to show the 

 transverse strength of concrete piles when reinforced with 

 steel, for the Sydney Harbour Board. The cross section 

 of one of the piles was triangular, the sides of which were 

 19i inches, the steel rods arranged at each corner were If 

 inch in diameter, tied every 6 inches with wire f inch in 

 diameter (see fig. 18). The pile was supported at each end 

 of the span of 5 feet 6|- inches and loaded in the centre. 

 The second pile was of square section, 14 inches by 14 inches 

 (Fig. 19) made and tested in a similar manner on a span of 

 5 feet 6f inches. The third pile was similar in section to 

 fig. 16, but it was tested on a span of 15 feet. The con- 



