298 



W. H. WARREN. 



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§31600 



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•0008 '0016 



•0024 -0032 -0040 "0048 

 Compressions in inches. 



•0056 '0064 '0072 '008 



» 



ss 



SI 



ss 



age 29 days. 

 t> 28 „ 

 »» 29 „ 



Fig. 13 — Compressive Tests of Mortar Prisms. 

 No. 1 — One Hemmoor Cement to two Emu Plains sand ; age 28 days. 

 „ 2— 

 „ 3 — „ „ three „ 



>» 4 ,y )> St SS 



„ 5— „ „ four 



)) D >j jj j) ss 



The diagrams show smooth curves, but in fig. 11 the 

 curves are slightly concave to the axis of stress, whereas 

 in fig. 12 some of the diagrams are slightly convex ; again, 

 in fig. 13 they are all convex to the stress axis as in the 

 tension tests. The coefficient or modulus of elasticity is 

 not so regular as in the tension tests, but it is much 

 greater than the corresponding modulus in tension. The 

 coefficient of elasticity increases with the age and richness 

 of the mixture. 



Transverse Tests. — The first series consisted of eight 

 beams 45 inches long by 4 inches by 4 inches of Portland 

 cement mortar, made with 1 part of cement and 3 parts of 

 standard sand, similar to that used in the tensile and com- 

 pressive tests. The beams were all tested on a span of 



