Research Article
Research on Control of Rib Spalling Disaster in the Three-Soft Coal Seam
Table 1
Comparison of physical properties between SMPGM and traditional PGM.
| | Physical and mechanical properties | SMPGM | Traditional PGM |
| | Viscosity after mixing/mPa·s | 200∼300 | 200∼300 | | Complete consolidation time/s | 60∼90 | 60∼90 | | Flash point/°C | >200 | >180 | | Flame retardant properties | Fully flame retardant | Self-extinguishing from the fire | | Reaction swelling | 1.0∼1.1 | 1.0∼2.5 | | Maximum compressive strength/MPa | 55∼65 | 60∼80 | | Maximum compression set/% | 20∼25 | >30 | | Maximum shear strength/MPa | >20 | >20 | | Maximum tensile strength/MPa | >20 | >20 | | Maximum bonding strength/MPa | >4.0 | >4.0 | | Compression modulus/MPa | 1400∼1600 | 300∼600 | | Viscosity after mixing/(mPa·s) | 200∼300 | 200∼300 | | Complete consolidation time/s | 60∼90 | 60∼90 | | Flash point/°C | >200 | >180 | | Flame retardant properties | Fully flame retardant | Self-extinguishing from the fire | | Reaction swelling | 1.0∼1.1 | 1.0∼2.5 |
|
|
