152 



REIBLING AND SALINGER. 



2. Cements which are slow setting at 20° C. but quick setting at 30° C. 



3. Cements which are quick setting at 20° C. and also at 30° C. 



As these results were obtained while we were endeavoring to determine 

 the variation which this climate might cause in tests which according 

 to American standard specifications are at about 20° C, we will publish 

 them in full in Tables XIV, XV, XVI, and XVII. 



In all the following determinations the cement was sieved and then very 

 thoroughly mixed. To eliminate any effect of unequal atmospheric exposure 

 each sample of .500 grams was put into a dry, clean bottle and tightly corked 

 until used. In gauging, the water was allowed to soak in for one minute, and 

 then the paste was vigorouslj' troweled for four additional minutes. 



Table XIV. — Class No. 1, slow-setting cements, little affected hy variations of 



temperature. 



6 



0) 



o 



Temperature when made. 



Tempera- 

 ture of 



room dur- 

 ing set- 

 ting. 



Water. 



Initial 

 set. 



Final 

 set. 



Condition of 

 paste. 



Cement. 



Water. 



Eoom. 





°a 



°C. 



°C. 



°C. 



Per cent. 



ft. m. 



h. m. 





1 



19 



19 



19 



19 -19.5 



20.66 



2 35 



6 15 



Slightly plastic. 



2 



19 



19 



19 



19 -19.5 



21.66 



2 45 



6 15 



Pla.stic. 



3 



19 



19 



19. ."i 



19 -19.5 



22.66 



3 00 



6 20 



Do. 



4 



19 



19 



19.5 



19 -19.5 



23.66 



3 00 



6 20 



Very plastic. 



5 



32 



32 



31 



32 -32.5 



20.66 



2 35 



6 20 



Plastic. 



6 



28 



28 



28.5 



28. 5-31 



21.66 



2 20 



4 20 



Do. 



7 



28 



28 



28.5 



28. 5-31 



22.66 



2 20 



4 30 



Do. 



8 



28.5 



28. 5 



28.5 



28. 5-31 



23.66 



2 55 



5 35 



Very plastic. 



9 



29 



29 



30 



30 -31 



23.66 



2 25 



4 15 



Do. 



Table XV. — Class No. 2, sloio-setting cements at 20°, quick-setting at 30° C. 



6 



■3 

 o 



m 



Temperature when made. 



Tempera- 

 ture of 



room dur- 

 ing set- 

 ting. 



Water. 



Initial 

 set. 



Final 

 . set. 



Condition of 

 paste. 



Cement. 



Water. 



Eoom. 





°C. 



°C. 



°C'. 



°C. 



Per cent. 



ft. m. 



ft. m. 





-1 



31 



31 



31 



31 -33 



21 



« 



(•) 





2 



31 



31 



31 



31 -33 



22 



25 



2 30 



Slightly plastic. 



3 



28 



28 



28.5 



28. 5-30 



21. 66 



21 



2 50 



Do. 



4 



28. 



28 



28.5 



28. 5-30 



22.66 



28 



3 00 



Plastic. 



5 



28.5 



28.5 



29 



29 -30 



23.66 



32 



3 10 



Very plastic. 



6 



19.5 



19.5 



19.5 



19.5-20.5 



21.66 



2 32 



3 40 



slightly plastic. 



7 



19.5 



19.5 



19.5 



19. 5-20. 5 



22.66 



3 30 



4 40 



Plastic. 



8 



19.5 



19.5 



19.5 



19. 5-20. 5 



23.66 



3 50 



5 00 



Very plastic. 



"Impossible to make pat. 



To determine the effect of gauging in the cold-storage room and setting 

 in the laboratory, and vice versa, two pats were made from each paste 

 and one subjected to the change in temperature; the results are recorded 

 in Table XVI. 



