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Trace element
contents in cements
Trace element contents are measured in all
cement plants. For Germany these data have been collected by VDZ.
The data obtained in the ECRICEM study on world-wide cements has
been compared with this dataset. The comparison (Table 1, Figure 1)
should primarily be done on median values, which indicate rather
similar levels.
As there is generally no relationship between trace element content
and leachability, the environmental aspects related to soil and
groundwater impact from cement-based construction products, can
not be judged by content alone. Cements with the same content may
behave very differently from a leaching point of view (Cr). The
use of content in judgement of cement quality is addressed in more
detail elsewhere (www.vdz-online.de/456.html).
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Arsenic (As)
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Cadmium (Cd)
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Chromium (Cr)
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|
Germany
|
World
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Germany
|
World
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Germany
|
World
|
|
N
|
415
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25
|
415
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25
|
415
|
25
|
|
n < d.l.
|
4
|
0
|
49
|
0
|
0
|
0
|
|
Mean
|
7.0
|
11
|
0.34
|
0.55
|
41
|
78
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Median
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4.3
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5.9
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0.29
|
0.47
|
36
|
55
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|
Xmin
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0.5
|
1.3
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0.05
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0.1
|
10
|
26
|
|
Xmax
|
97
|
72
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1.5
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1.9
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193
|
218
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St. Dev.
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9.3
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16
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0.25
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0.43
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22
|
51
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|
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Zinc (Zn)
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Mercury (Hg)
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Lead (Pb)
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Germany
|
World
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Germany
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World
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Germany
|
World
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N
|
415
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25
|
415
|
25
|
415
|
25
|
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n < d.l.
|
0
|
0
|
0
|
0
|
0
|
0
|
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Mean
|
192
|
117
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0.05
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0.06
|
17
|
25
|
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Median
|
150
|
82
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0.03
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0.05
|
13
|
14
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Xmin
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9
|
16
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0.01
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0.02
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1.7
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2.7
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Xmax
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1023
|
372
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1.1
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0.12
|
105
|
169
|
|
St. Dev.
|
155
|
95
|
0.07
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0.03
|
14
|
32
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Table 1: Summary statistics
of the content of a few trace elements (mg/kg) in World wide cements
(ECRICEM) in comparison with extensive German cement data (VDZ)
Figure 1: Graphs of the
content of a few trace elements (mg/kg) in World wide cements (ECRICEM)
in comparison with extensive German cement data (VDZ)
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