Study on Test and Ratio Optimization of Waste Rock-Fly Ash Aggregate Filling Slurry
| Autor: | Gao Qian, Xiaobing Yang, Li Litao |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | IOP Conference Series: Earth and Environmental Science. 330:042032 |
| ISSN: | 1755-1315 1755-1307 |
| Popis: | To obtain the optimum proportion of fly ash alternative for preparing filling slurry instead of waste rock, the effect of fly ash dosage on the filling body strength is predicted by utilizing BP neural network model on the basis of experimenting the particle size distribution, filling body strength and slurry working characteristics of waste rock-fly ash binary aggregate system under various fly ash dosages. As the results revealed, the waste rock-fly ash binary mixture system attains the densest accumulation when the fly ash dosage is 30%. At this point, the compressive strengths at all ages reach the maximum, according to the BP neural network model predictions. The minimum cost for preparing filling slurry is obtained to be 121 yuan/m3 based on the cost optimization model. At this time, the fly ash dosage is 26%, the cementitious material consumption is 286 kg/m3, the slurry concentration is 81%, the 3d strength is 1.26 MPa, the 7d strength is 1.52 MPa, the 28d strength is 5 MPa, the expansion degree is 51.4 cm, and the bleeding rate 5.7%. Both the filling body strength and slurry fluidity conform to the requirements, while the fly ash dosage is almost identical to that obtained from the particle size distribution and filling body strength tests. |
| Databáze: | OpenAIRE |
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