PORTLAND CEMENT TESTING. 

 Table XVI. 



153 



Bot- 

 tle 

 No. 



Pat 



No. 



Temperature when made. 



Tempera- 

 ture of 



room dur- 

 ing set- 

 ting. 



Water. 



Initial 

 set. 



Final 

 set. 



Condition 

 of paste. 



Cement. 



Water. 



Room. 



1 

 2 

 3 

 i 



{2 

 {2 

 {2 

 {2 



°C. 

 20.5 

 20.5 

 20.5 

 20.5 

 32 

 32 

 82 

 32 



°C. 



20.5 



20.5 



20.5 



20.5 



20 



20 



32 



32 



°C. 



21.5 



21.5 



21.5 



21.5 



32 



32 



32 



32 



°C. 

 20. 5-22 

 32 -32 

 20. 5-22 

 32 -31.5 

 32 -31.5 

 20.5-22 

 32 -31.5 

 21.0-22.0 



Per cent. 

 22. 66 

 22.66 

 22.66 

 22.66 

 22.66 

 22.66 

 22.66 

 22.66 



h. in. 



2 15 

 55 



2 20 

 60 

 26 

 50 

 21 

 88 



h. m. 

 2 10 



2 80 



1 55 



1 21 



Plastic. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 

 Do. 



Table XVII. — Class III, ceinents ivMch are quick setting at 20° and also at 30° 



Bottle No. 



Cement. 



Tempera- 

 ture of 

 water, 

 cement, 



and room. 



Tempera- 

 ture of 



room dur- 

 ing set- 

 ting. 



Water. 



Initial 



set. 



Condition of 

 paste. 



1 and 9 



2 and 10 . 



3 and 11 



4 and 12 



5 and 13 — 



6 and 14 



7 and 15 



8 and 16 . 



1 and 8 



2 and 4 



A 

 A 

 A 

 A 

 A 

 A 

 A 

 A 

 B 

 B 



°C. 

 17-18 

 29-80 

 17-18 

 29-80 

 17-18 

 29-80 

 17-18 

 29-30 

 17-18 

 29-30 



°C. 

 17. 5-18 

 29 -30.5 

 17.5-18 

 29 -30.5 

 17. 5-18 

 29 -30.5 



Per cent. 

 22 

 22 

 21 

 21 

 20 

 20 

 19 

 19 

 24 

 24 



li. m. 



1 40 



1 20 



1 25 



1 20 



40 



45 



« 



(■) 



28 



24 



Plastic. 



Do. 



Do. 



Do. 

 Slightly pla.stic. 

 Plastic. 



(•) 

 (») 

 Very plastic. 



Do. 



17 -18.5 

 29 -31 



"Impossible to make pat. 



Eemark. — Pastes made with 20 per cent of water were more plastic when made 

 at 30° than at 17°. 



MOIST-AIE CLOSET. 



Another possible source of error -which may be accountable for con- 

 siderable variation may develop during the moist-air treatment. 



Most specifications allow the briquettes to be stored for the first 

 twenty-four hours in a moist-air closet or under a damp cloth. Moist- 

 air closets are given the preference, as unequal drying often occurs in 

 using the damp) cloth. A weU-constructed moist-air closet is essential 

 to uniform results. 



One condition in the use of a moist-air closet that is liable to have 

 considerable influence upon the result of the cement tests sliould be taken 



" This table also shows the marked effect that 1 per cent of water more or 

 less, will produce upon the plasticity and time of setting of some cements. 



