Characteristics of physico-mechanical evolution of cement-fly ash slurry agglomerates with different ratios
In order to solve the problems of low grouting efficiency,high cost,poor groutability,control-lability and stability of slurry,and increased damage of underground rock cracking after continuous mining in a mine in western Inner Mongolia,the main controlling factors of grouting sortability in a mine in western Inner Mongolia were better revealed as well as to determine a better slurry proportion according to the actual engineering profile.The new grouting materials were developed with different ra-tios of fly ash(0.6,0.8)and different amounts of fly ash mixing(0％,10％,20％,30％,40％)as the main base materials,and the grouting material rock mass was maintained for different periods(3,7,14,28 d),and the physical and mechanical properties of the grouting material rock mass were explored.The results show that:Fly ash slurry stone rate decreases with the increase of water-cement ratio and fly ash dosage,fluidity rises with the increase of water-cement ratio and fly ash dosage,and the fluidity and solidity rate reaches the peak when the fly ash dosage is 40％;with the gradual increase of the curing time,the wave velocity of the stone body gradually decreases,and the wave velocity of the stone body is maximum when the curing period is 28 d and the water-cement ratio is 0.6;the water-cement ratio is 0.6.When the water-cement ratio is 0.6,the mixing amount of fly ash is 0％,and the maintenance pe-riod is 28 d,the maximum compressive strength is 30.153 MPa.The research results provide reference for the grouting stability of a mine in the western part of Inner Mongolia and the grouting and plugging reinforcement technology for the fissures of underground rock bodies and undesirable geologic bodies,as well as indoor validation for the selectivity of the water-cement ratio of the slurry.
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