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Plaster sand properties
1. Plaster sand – grain size composition
5-
< 0,125 mm (“dust”) dust is a must in the mixture in order to
10%
receive pumpable material
0,125 - 0,25 mm 5-
10%
0,25 - 0,5 mm 15 -
20%
0,5 - 1 mm 12 -
18%
10 -
1 - 2 mm 15%
30 -
2 - 4 mm 40%
PMM / Jochen Knecht 19.02.2010
2. Grain size composition of 4mm plaster sand
The ideal gradiation for mortar machines is between standard curves B4 and C4
100
Percentage Passing [%]
90
80
70
60
50
40
30
20
10
0
0 0,125 0,150 0,25 0,30 0,50 0,60 1 1,18 2 2,36 4 4,75
Particle Size [mm]
the content of fines (filler, clay, dirt) is very important for the
The contentthe more fine particles (fillers, clay, dust)
of the the better ! is very important for the
pumpability - B4 C4
pumpability! But, if it is too much, cracks may occure due to the higher shrinkage.
PMM / J. Knecht 19.11.2010