KIV,2 Witt: Effect of Calcium Sulphate on Cement 931 
TABLE III.—Mill test to establish relation between sulphuric anhydride and 
setting time. 
Sample No. Pica. {ioentes| costar: | Mtl lined oat: Gap 
dride. ency. set. mesh). 
p.m, | Per cent. Min. Min. 
Vite eee dele paar onn 6. 00 2.15 24 170 270 89.0 
Do ee ec sae A aoe 6.30 2.15 24 140 S70 toc eee 
Salome pee Te = 7.00 2.06 24 150 290 87.2 
So ee i co eae neue ee uenne 7.30 1.92 24 190 STO Tiki ce 
Ws ee ee 8.00 bE r ie Babar apleteriies 55 1380 87.8 
eee Oa as DS GR EPP PL COE SE 8.80 TG 2 Peete flash |_-.. 
[gait REPRO: SE Aerio ce ial lem 2, Waa 8. 45 eae Sas ee as 
De ela stad eempee 9.00 eB Benen tae Watt Tocca 88.9 
a se cae ee te ue 9.15 UBS fiwiieveccs : Oe Peeters eae Oyrniica aro 
Oe ac eee en wud menace 9.30 O78 tactcis Si Lp Ge eeseieetipeym Seer anne 
Feed Gawavene aw adn sasadmnwedene 9. 45 O76 ae | 1, We Prep g eennean Gee meres ote 
Deva hesd is ciek oun ee boncncewwenns 10, 00 OP ccs OTS 1 a purmgenange ree 89.6 
Toe ick nd eeanacoudsnn 10.30 O08 to cee MAGN: toa cdoctust ecentane 
Teo ashe neeane peoomn puawew 11.00 5 Spt iB pay Sere WOsh 12 cs cece 89.6 
Wiis aA acc tesanaswacenbarean cs 11.30 1,44 24 170 BE Few s 
a.m. 
5 | ene Se reo, Rae eewtae REMAP oeaer yy 12.00 1.72 24 130 230 86.2 
) i Geeeaie pairs Rtg emg repay eee ET cee 12.30 1.64 24 170 SPO iicct coed 
i ww sanenennn 1.00 1.54 24 150 280 85.2 
Taste IV.—Effect of exposing cement of various sulphuric anhydride con- 
tents to the atmosphere for different periods of time. 
Sari Days of exposure. 
ple Test. 
7 None. | 2. 4. 9, 16. | 82. | 8. 
2 initial eeta.c3 ee 170 200 240 240 210 800 | 170 
St igel bet cs cease min... 270 400 450 800 600 540; 260 
1 | Normal consistency --------------- 24 24 24 24 25 33 83 
Ob Pitta dete. cen 535 min... 190 190 250 10 15 35 | 100 
Bt WEA BOE oak eudan sue aecae<st min.. 270 880 450 150 160 45 170 
4 | Normal] consistency -.--..---------- 24 24 24 24 24 33 33 
eats set.c.o oo se min-.- 55 0 85 3 q 25 80 
et Pas 6b ce os anaes min. 125 0 800 220 160 851 160 
5 | Normal consistency -.------------- 24 24 24 24 25 83 83 
46+ Initial pat. occ min... 0 0 25 260 200 70 90 
an) WE Wet ee ee min_- 0 0 620 730} (a) 120 
18 | Normal consistency --------------- 24 24 24 29 29 33 
45 t Initial eeticc 3.505 oh min... 170 10 120 10 10 25 45 
Z Pirie) 0% 50522 ose es min... 220 850 540 280 140 40; 170 
15 |} Normal consistency --------------- 24 24 24 24 24 29 33 
46:| Initial et..W. < 23... cco e-se~- min-- 180 140 270 10 10 15 55 
46) Pita) Ob ccc ce eee min_- 230 850 250 160 160 30 | 120 
16 | Normal consistency ----.---------- 24 24 24 24 24 29 38 
47 | Initial bet. .<.----..5--2-.- min_- 170 125 190 5 5 16 60 
49.1 Pinal pet <.200505 5. ~c08<5 5-5 min_- 230 830 830 200 100 30; 140 
17 | Normal consistency --------------- 24 24 24 24 24 29 33 
«Time of set indefinite but more than twenty-four hours. 
