Embed Size (px)
DESCRIPTION
Cement Fineness calculation with respect to residue of the sample material
Citation preview
1. know "Blaine" and want to find P80
Find;
80 percent passing size in micron
Log X = 2 x log [(20,300)/Blaine (cm2/g)]
Blaine2 x log
[(20,300)/Blaine] P80 (um)
1000 2.6 412.1
1200 2.5 286.2
1400 2.3 210.3
1600 2.2 161.0
1800 2.1 127.2
2000 2.0 103.0
2200 1.9 85.1
2400 1.9 71.5
2600 1.8 61.0
2800 1.7 52.6
3000 1.7 45.8
3200 1.6 40.2
3400 1.6 35.6
3600 1.5 31.8
3800 1.5 28.5
4000 1.4 25.8
4200 1.4 23.4
4400 1.3 21.3
4600 1.3 19.5
4800 1.3 17.9
5000 1.2 16.5
5200 1.2 15.2
2. Relative Screen No. and micron
Screen no.# Micron
325 44
170 88
120 125
80 177
60 250
45 354
35 500
25 707
10 2000
3. know % size residue and want to find F80
F80 = log [(0.20) size residue(mm.)]
/log(%residue)
%Residue on size
Size (mm.) 2 5 10 15 20 25
1 0.4 0.5 0.7 0.8 1.0 1.2
2 0.8 1.1 1.4 1.7 2.0 2.3
5 2.1 2.7 3.5 4.2 5.0 5.8
10 4.1 5.4 7.0 8.5 10.0 11.6
15 6.2 8.1 10.5 12.7 15.0 17.4
20 8.2 10.7 14.0 17.0 20.0 23.2
25 10.3 13.4 17.5 21.2 25.0 29.0
30 12.3 16.1 21.0 25.5 30.0 34.8
35 14.4 18.8 24.5 29.7 35.0 40.6
40 16.5 21.5 28.0 33.9 40.0 46.4
45 18.5 24.2 31.5 38.2 45.0 52.2
50 20.6 26.9 34.9 42.4 50.0 58.0
ex: 5% residue 25 mm. ==> F80 = 13.4 mm.
%Residue on size
30
1.3
2.7
6.7
13.4
20.1
26.7
33.4
40.1
46.8
53.5
60.2
66.8
