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Gold Science and Technology ›› 2018, Vol. 26 ›› Issue (3): 305-311.doi: 10.11872/j.issn.1005-2518.2018.03.305

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Influence of APAM on Early Age Strength of Cemented Backfill Based on Unclassified Tailings

WANG Xinmin,ZHAO Maoyang,RONG Shuai,WANG Hao,ZHANG Yunhai   

  1. School of Resources and Safety Engineering,Central South University,Changsha 410083,Hunan,China
  • Received:2017-01-06 Revised:2017-09-15 Online:2018-06-30 Published:2018-07-28

Abstract: In order to determine the influence of anionic polyacrylamide (APAM) on early strength of cemented backfill body of unclassified tailings,experiments on cemented backfill samples (concentration of 70%,72% and 74%,cement-sand ratio of 1∶4 and 1∶8,respectively) with different dosage and relative molecular weight of APAM were conducted by using the dynamic test apparatus of thickener.At the predetermined 7 d curing periods,the cemented backfill samples were subjected to the uniaxial compressive strength tests,and microstructure of backfill body was analyzed by using scanning electron microscope (SEM).The results show that,AMAP has certain influence on the early strength of the backfill body,when the cement-sand ratio is lower and the mass concentration is higher,the larger the molecular weight of APAM is,the more evident the decrease of uniaxial compressive strength of cemented backfill body will be.The strength of cemented backfill first increased and then decreased with increasing the unit consumption of APAM.SEM results show that APAM introduces more enclosed pores into cemented backfill body,however proper amount of APAM can promote the hydration reaction and increase the compactness of hydration products in backfill body,which leads to higher early strength of backfill body. In this experiment,the optimum unit consumption of APAM is 5 g/t.

Key words: APAM, relative molecular weight, unit consumption, unclassified tailings cemented backfill, early strength, hydration, SEM, microstructure

CLC Number: 

  • TD853
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