186 



W. H. WARREN. 



TABLE IV. k.— COMPRESSION TESTS, CONCRETE PRISMS. 



Length 24 inches, Octagonal Cross Section. 



Elastic limit of soft steel wire used in spiral = 39,000 pounds per square inch. 



Elastic limit of Bessemer steel used in longitudinal rods 

 square inch. Area 2975 square inch. 



37,770 pounds per 



Composition 



p.*. - 



SP •- "~ c 



!*> = . 



3 ^ o 













X IU« | 







1 cement, 2 sand, 



133 



301 



1-80 



4180 



4-180 



2786 



1 Fig. 



Crushed near one 



2 | in. shivers, 





602 



3-35 



3425 



4550 





IV.k 



eudjj 



no bars. 





1204 

 1806 

 2258 



suit 

 16 81 



IV, s^ 



2400 



1-510 

 1060 



3 360 

 2 680 



2 090 









1 cement, 2 



131 



301 



203 



3-760 



3700 



4C98 



2 Fig. 



Outside peeled "'at 



2 | in. Bhivers. 





602 



4-58 



2770 



3-320 





IV.k 



90,000 pounds. Broke 

 at 119,000 pounds. 

 One spiral burst. 



Spiral 3 in. pitch 





12di 



1123 



1-810 



2670 







5 in. dia. No. 5 





1806 



22 21 



1140 



2040 









gauge wire 





22B8 



35*46 



942 



1-580 









l cement, 2 sand. 



130 



301 



240 



i' 900 



3 120 



2846 



3 Fig. 

 IV.k 



Outside [peeled at 



2 | in. shivers, 





602 



4 54 



2 8i M • 



3310 





67,000 pounds, centre 

 of prism crushed at 



Spiral j in. pitch 





1201 



11-75 



1510 



2 560 







85,000 pounds. 



5 in. dia. No. o 





1806 



22 93 



•920 



1-197 









gauge wire 











• 









1 cement, 2 Band, 



L23 



301 



1-70 



3140 



4400 



5270 



4 Fig. 



Cracked at 101,000 



2 4 in. shiver?. 

 Spiral 4 1 in. pitch 





602 

 1204 



4 S3 

 1500 



1-980 

 1-215 



3- 100 



2 000 





IV.k 



pounds, and outer 

 covering peeled off 

 at 119,000 pounds. 



5 in. dia. No. 5 





1806 



31 52 



•770 



1-430 







Buckled at 134,000. 



gauge wire, 6 j 





2258 



51-26 



•522 



1090 







broke at 157,000 

 pounds. 



in. dia. vertical 

















steel rods 



















1 cement, 2 sand, 



129 



(301 



207 



3300 



3-640 



4214 



5 Fig. 

 IV.k 



Cracked at 112,000 



2 f in. shivers. 





a l602 



458 



2 800 



3270 





pounds; the outside 

 peeled off and broke 



Spiral f in. pitch 





f602 

 b l301 



507 



3960 



2970 







at 126,000 pounds. 



5 in. dia. No. 5 





2-86 



2 800 



2620 







Failed in body of 



gauge wire, 10 





( 301 



246 



3420 



3050 







prism. 



a — load ascending 



j* in. dia. vertical 



a 



) 602 



4-88 



3 000 



3-080 







b — load descending 



steel rods 





( 1204 

 (1204 



1013 

 1251 



2-510 

 3-580 



3000 

 2-400 











b 



\ 602 

 ( 301 

 f 301 

 | 602 



6-86 

 401 

 368 

 609 



2-900 

 2650 

 3140 

 3140 



2190 

 1-870 

 2-040 

 2-470 











a 



<< 1204 

 | 1806 



L2258 



1102 

 16-70 

 22-79 



2900 

 2-250 

 1-880 



2-720 

 2710 

 2 470 









