Effect of copper mining wastewater on the properties of alkali-activated fly ash/slag cementitious materials
This study employs copper mining wastewater(CMw)as mixing water to prepare alkali-activated fly ash/slag(AAFS)cementitious material,aiming to expedite the resourceful utilization of CMw.The influence of varying CMw dosages on the setting time,hydration characteristics,hydration products,pore structure,and compressive strength of AAFS was investigated through this study.The results indicate that the incorporation of CMw in AAFS slightly prolongs its setting process while slightly promoting the hydration process of AAFS.This phenomenon is attributed to the acidity of CMw,residual organic reagents,and metallic ions present.By adding varying amounts of CMw,the gel pores of AAFS continue increasing,while the transitional pores grad-ually decrease in volume.The compressive strength exhibits a trend of initial enhancement followed by a slight reduction.When the CMw dosage reaches 50%,the compressive strength of AAFS shows the greatest improve-ment,with increments of 12.23%(3 d),21.07%(7 d),and 16.74%(28 d),respectively.These research find-ings offer new insights and references for the resource utilization of copper mining wastewater.
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