Optimization and Research on the Mix Ratio for Improving the Early Strength of Sprayed Concretee
Jiaojia Gold Mine adopts the mechanized production mode of drilling trolley and anchor trolley supporting large trackless shovel transport equipment,it is found that the shotcrete quality and early strength are low in the shotcrete supporting link of stope approach,as a result,the matching degree between shotcrete operation and drilling and shoveling is reduced,continuous operation is not possible.Based on this background,mine technicians study the slurry spray,through raw material testing,empirical formula calculation,experimental ratio adjustment,field verification,finally determine the shotcrete slurry ratio,the 2-hour compressive strength of the gunite reaches 1 MPa,to achieve the early strength of shotcrete to achieve the effect of safety support,then it provides support for the optimization of production links such as drilling and shoveling,to realize the purpose of safe and efficient continuous construction operation in mines.
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