A PRELIMINARY REPORT ON CLAYS OE FLORIDA 
149 
Physical Properties of Dexland Clay No. 3 (No. Lab. 0-13). 
Plasticity, judged by feel. . . . 
Water of plasticity. 
Linear air shrinkage. 
Volume air shrinkage. 
Modulus of rupture, average 
Slaking test. 
Steel hard at cone 010. 
Overfires at cone 16. 
Excellent. 
28.60% 
11.6 % 
33.8 % 
656.6 pounds per square inch. 
2 days. 
Fire tests: 
T emperature. 
Linear Shr. 
Absorption. 
Porosity. 
Color. 
950°C. 
Per Cent. 
1.1 
Per Cent. 
14.95 
Per Cent. 
22.40 
Pink. 
1050 
1.9 
14.30 
29.75 
Pink. 
1150 
4.4 
9.30 
20.95 
Buff. 
1190 
4.4 
7.83 
19.20 
Buff. 
1230 
5.4 
6.80 
18.30 
Cream. 
1310 
5.4 
5.35 
12.10 
Cream. 
1370 
5.4 
3.72 
11.70 
Gray. 
1430 
6.4 
3.32 
10.80 
Gray. 
Separated from the above clay by a thin sand parting is Dexland No. 
3, which is a very plastic gray clay having the following physical prop¬ 
erties : 
Physical Properties of Dexland Clay No. 3 (Lab. No. 0-13). 
Plasticity, judged by feel.... 
Water of plasticity . 
Pore water. 
Shrinkage water. 
Linear air shrinkage. 
Volume air shrinkage. 
Modulus of rupture, average 
Slaking test. 
Steel hard at cone 05. 
Overfires at cone 16. 
Excellent. 
29.40% 
1.65% 
27.75% 
10.6 % 
38.4 % 
475.0 pounds per square inch. 
20 minutes. 
Fire tests: 
T emperature. 
Linear Shr. 
Per Cent. 
A bsorption. 
Per Cent. 
Porosity. 
Per Cent. 
Color. 
950°C. 
0.5 
16.80 
33.65 
Pink. 
1050 
0.6 
18.40 
32.25 
Cream. 
1150 
6.4 
12.25 
18.00 
Buff. 
1190 
6.4 
4.15 
19.45 
Buff. 
1230 
6.4 
2.58 
10.10 
Gray. 
1310 
6.4 
1.22 
5.40 
Gray. 
1370 
6.9 
3.05 
5.25 
Gray. 
1430 
4.4 
6.75 
Gray. 
Dexland Clay No. 4 is a gray, slightly sandy clay, exposed in both 
the upper and lower bluffs. It is the uppermost clay stratum having an 
