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Advances in Civil Engineering
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2021
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Article
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Tab 2
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Research Article
Effects of Foaming and Drainage Behavior on Structure and Properties of Polyurethane/Water Glass (PU/WG) Grouting Materials for Coal Mines
Table 2
Average value and standard deviation of compressive strength of the sample.
Sample
Compressive strength (MPa)
Average value (MPa)
Standard deviation
C7-1%
42.6
43.2
44.0
43.3
0.5735
C14-1%
2.3
2.8
3.0
2.7
0.2944
C17-1%
5.5
5.0
4.2
4.9
0.5354