Owner's manual

www.humboldtmfg.com
HUMBOLDT
Testing Equipment for
Construction Materials
Humboldt Mfg. Co.
875 Tollgate Road
Elgin, Illinois 60123 U.S.A.
U.S.A. Toll Free: 1.800.544.7220
Voice: 1.708.456.6300
Fax: [phone]
Email: [e-mail]
Table 1—Conversion Table for
Stem (Chace) Factor of 2.2
Mortar Content Multiply Stem
Ft
3
/yd
3
Reading By
10 0.81
11 0.90
12 0.98
13 1.06
14 1.14
15 1.22
16 1.30
17 1.39
18 1.47
19 1.55
20 1.63
21 1.71
22 1.79
23 1.87
24 1.95
25 2.03
26 2.12
27 2.20
Table 2—% Air Content Curve
Correction Factor
Mortar Corrected Curve Correction
Air Content % %
1 -0.1
2 0
3 0.2
3.5 0.3
4 0.3
4.5 0.4
5 0.5
5.5 0.6
6 0.7
6.5 0.8
7 0.8
7.5 0.9
8 1.0
8.5 1.1
9 1.2
9.5 1.3
10 1.3
11 1.5
12 1.7
13 1.8