| abstract |
The present invention is a mixture of calcium aluminate-based cemented carbide and cement-based fasteners composed of carbonates, such as K 2 CO 3 , Na 2 CO 3 , calcium hydroxide, calcined lime, sodium aluminate, etc. The present invention relates to a fastening additive prepared and manufactured, which not only terminates in minutes which cannot be achieved with conventional fasteners or cemented carbide cements, but also exhibits high strength of 20 kgf / cm 2 or more, and rebound amount of shotcrete after spraying is significantly lower than 15% by weight. The invention relates to a decreasing quenching additive composition. |