Influence of Mixed Coarse Aggregate Ratio on Strength and Fluidity of Filling Slurry
Received date: 2021-10-11
Revised date: 2021-12-12
Online published: 2022-06-17
The downword drift cemented filling method is an effective way for mining thick，broken，high-grade deposits in Jinchuan mining area.However，it not only has complicated process and high cost，but also requires high quality of filling body.In order to alleviate the pressure caused by insufficient rod milling sand production capacity and increase of produciton cost in Jinchuan mining area，and improve the comprehensive performance of filling body，the mechanical test of the filling body and the rheological properties，fluidity and bleeding rate test of the slurry were carried out，based on cement-sand ratio of 1∶4，using -5 mm rod mill sand，-12 mm waste rock as aggregate，the new consolidation powder as cementitious material.The influence of waste rock and rod milling sand ratio on the strength characteristics，fluidity，rheology and bleeding characteristics of filling body were studied，and the optimal ratio parameters were proposed. The results show that the 3 d strength of filling body decreases slightly，and the 7 d and 28 d strength increased slightly with the increase of the waste rock content.The yield stress of the slurry increase with the increase of waste rock content，and the viscosity coefficient decreases significantly.When the content of waste rock is less than 35%，the yield stress of slurry is less than 150 Pa.The slump and diffusivity degree decrease sharply with the increase of the waste rock content. The slump degree is generally between 27~29 cm，which can meet the requirements of gravity transportation.The bleeding rate of the slurry is 9%~12%.With the increase of waste rock content，the bleeding rate decreases，which is beneficial to improve the segregation resistance of the slurry.According to the test results，the optimal dosage of waste rock in the mixed coarse aggregate is 30%，and the optimal mass concentration is 82%~83%. Under the condition of these parameters，the indexes of filling body can meet the filling quality standard of Jinchuan mining area，which has great significance and application potential to improve the stability of filling body and reduce the cost of Jinchuan mining area.
Yongliang FAN , Jiqiang CUI , Yuankun ZHANG , Feng LI , Chunyun HUANG , Yuantong GU , Jianyuan HE . Influence of Mixed Coarse Aggregate Ratio on Strength and Fluidity of Filling Slurry[J]. Gold Science and Technology, 2022 , 30(2) : 263 -271 . DOI: 10.11872/j.issn.1005-2518.2022.02.146
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