166 IIBIBLING AND SALINGER. 



Table XVLII. — Hliowinci the uniforiiiUy of hreuks due to the method of tainiiiiitj.- 



No. 



Fineness, specific gravity, and set.' 



Tensile strength in pounds per square 

 inch. 



Fineness 



(100 

 mesh). 



Specific 

 gravity. 



Initial 

 set. 



Final 

 set. 



Neat cement. 



1 cement to 3 

 sand. 



1 day. 



7 days. 



28 days. 



7 days. 



28 days. 









h. m. 



ft. m. 













F3-1 



95.9 



3.06 



1 10 



2 15 



345 



558 



625 



166 



250 



r2-2 



96.3 



3.07 



1 15 



2 10 



331 



553 



650 



164 



271 



F2-3 



96.6 



3.07 



1 30 



2 25 



327 



495 



582 



162 



274 



F2-4 



97.0 



3.07 



1 30 



2 25 



300 



511 



568 



166 



260 



F2-5 



96.8 



3.07 



1 30 



2 30 



322 



520 



585 



159 



. 249 



F2-6 



96.0 



5.07 



1 23 



2 33 



330 



528 



622 



157 



245 



F2-7 



97.0 



3.06 



1 35 



2 45 



351 



534 



562 



163 



247 



r2-8 



96.5 



3.07 



1 37 



2 40 



334 



506 



611 



163 



260 



F2-9 



96.5 



3.06 



1 25 



2 45 



335 



503 



620 



158 



249 



F2-10 



96.4 



3.07 



1 30 



2 60 



338 



522 



600 



175 



2.56 



Numb 









2 



3 



3 



4 



4 











"See also Table XI. 



!• Soundness satisfactory at the end of six and twenty-eight days, respectively. 



The following diagram demonstrates the value of onr method : Twenty- 

 eight briquettes of cement, ground extremely fine, were made and four 

 briquettes were broken every other day. The results are plotted on the 

 curve shovm by diagram number 3. 



/I^'e: in days 



300 





to 



1^ 



' eso 



■aj zoo 



J50 

























^ 























, 







^ 









^ 



^^ 





^ 







< 





-^^ 





! 



y^ 



y t 





< 



















-- 



^-^ 















































5 7 



DiAGRAJI No. 3. 



a 



This curve is of interest as it plainly demonstrates the unequal action 

 of water upon the briquettes, the tendency being for the curves of the 

 extreme breaks gradually to grow farther apart. The low tensile strengtli 

 neat, as a characteristic of extremely fine grinding, is also of interest. 



