APPLICATI ON OF CHEMICAL ADDITIVES FOR WET SHOTCRETE PROCESS IN UNDERGROUND MINING

https://doi.org/10.48498/minmag.2023.214.2.005

The practice analysis results to use the shotcrete supports in the underground mines of Kazakhmys Corporation LLP have concluded that the 28 daystrength of concrete cube should be more 30 MPa. It should not have the breaks, cracks, blowholes and other defects. Plasticizers should be introduced into the concrete mix to meet the requirements for strength, flowability and setting time. Some disadvantages of the currently used material and method of its application have been determined. They have included the aggregates with fines which caused the excess consumption of cement and the drying of the washed aggregates to the required moisture content. The pilot tests of the sprayed concrete mix have been performed with using the Normet chemical additives to avoid disadvantages and to introduce the advanced technological solutions for the mining operations at Kazakhmys Corporation LLP.

*A.G. Akpanbayeva, T.K. Isabek