182 ANNUAL REPORT 
After being made up, ground and dried, these cements were burnt in 
large Hessian crucibles in a vertical test kiln of the Ceramic Department 
at the Ohio State University, the temperatures being determined by 
means of the Chatelier pyrometer. Contrary to expectations, the-tendency 
to dust at higher temperatures was not marked with most of the cements. 
‘At 1250° C., all the cements with kaolin were vitrified or partially fused. 
In regard to dusting (batch) numbers 1, 2 and 6 showed this tendency 
in the most striking manner. The dolomitic cements did not dust at all. 
In removing the content of the crucible, care was taken to reject all of 
the material clinging or fused to the sides. The crucibles were removed 
from the kiln as soon as the desired temperature was reached, being thus 
cooled very rapidly. 
The cements were now ground and made up into briquttes, one 
cement, one sand, placed under a moist cloth, and when sufficiently 
hardened were placed in water for 28 days. 
The results of the tests are given by the following table: 
Pure LIME SERIES. 
“OHA 
g° | aeee 
| Clay base. Formula of Cement. . ef 6 3.8 3 Remarie 
s : S38 | sess 
E g 5 | Ses 
= oO 2 0°mM Oo 
Z, HH AHN 
1} KXaolin. (2.5CaO)SiO,, CaOAl,O, 900 | :... | Briquettes broke. 
2 |e e 5 1,000 | 156 | Hot and sticky. 
3 a i 1,100| .... | Not tested. 
4 " 1,300 39 | Quick setting, dry 
and crumbly. 
5 | Kaolin-flint mixture (2.5CaO)Si0, CaOAl.O, 900 181 
6 |. nett 2 1,000 | 225 
7 a : 1,100 | 145 | Hot and sticky. 
8 KXaolin. (2.0CaO)SiO,, CaOAl,O, 900 20 | Softened. 
9 mt yy 1,000; 188 
10 % i 1,100 | .... | Not tested. 
11 | ie | “i 1,270 | 55 | Dry and crumbly. 
12 Kaolin-flint mixture | (2.0CaO)SiO, CaOAl,O, 900 | 182 | 
13 | tt | rf 1,000 | 218 
14 | ss | ef 1,100 | 111 | Set too rapidly. 
15) | cc 1,230 | .... | Brokeup in2days. 
