| 摘要 |
Resinous compositions of the "single-component" type comprise as fillers, carbon black, 40 to 70% of chalk, and 10 to 40% of quartz sand, and sufficient of a resinous binder comprising unsaturated polyester resin, catalyst and inhibitor to form a matrix for the said fillers, the said percentages being by weight based on the weight of the composition. The carbon black makes it possible to achieve a much better compromise between the viscosity of the composition and its reactivity. Such compositions are useful for positioning strengthening rods in mine levels and other works by introducing into a long bore made in a wall or other surface to be strengthened the composition and a rod of substantially the same length as the bore, and rotating the rod at a rotation speed which causes it to heat up by friction with the composition to the hardening temperature of the composition so as to cause the rod to be sealed in the bore by the hardening of the composition. |
