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Pore Structure Evolution of Cemented Paste Backfill Observed with Two-Dimensional NMR Relaxation Correlation Measurements
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-09-06 , DOI: 10.1021/acs.iecr.1c01819 Neil Robinson 1 , Razyq Nasharuddin 1 , Ganhua Luo 2 , Andy Fourie 2 , Einar O. Fridjonsson 1 , Michael L. Johns 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2021-09-06 , DOI: 10.1021/acs.iecr.1c01819 Neil Robinson 1 , Razyq Nasharuddin 1 , Ganhua Luo 2 , Andy Fourie 2 , Einar O. Fridjonsson 1 , Michael L. Johns 1
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Cemented paste backfill (CPB) technology is a favored approach with which to dispose of solid mining waste in underground voids. Knowledge of the evolving material properties of CPB under the conditions of hypersaline water-initiated hydration is crucial for its enhanced utilization as passive support material in mining operations. Here, we investigate the hydration behavior of CPB samples using 1H NMR T1–T2 correlation measurements at a low magnetic field (2 MHz), contrasting hypersaline and tap-water-hydrated CPB comprising 5 wt % cement binder for up to 28 days. Our results reveal a complex and rapidly evolving hierarchical pore network within the CPB structures. Relaxation peaks are assigned to a combination of pore water populations and pore-to-pore exchange dynamics with the aid of additional relaxation-exchange correlation measurements. Differences in the hydration behavior of hypersaline and tap-water-hydrated materials are further discussed in terms of observed exchange processes and evolving pore surface chemistry.
中文翻译：
用二维核磁共振弛豫相关测量观察水泥浆回填物的孔隙结构演变
水泥浆回填 (CPB) 技术是处理地下空隙中固体采矿废物的一种受欢迎的方法。在高盐度水引发的水合作用条件下，了解 CPB 不断演变的材料特性对于提高其在采矿作业中作为被动支撑材料的利用至关重要。在这里，我们使用1 H NMR T 1 – T 2研究 CPB 样品的水合行为在低磁场 (2 MHz)、对比高盐度和自来水水合 CPB 下的相关性测量，该 CPB 包含 5 wt% 的水泥粘合剂，持续时间长达 28 天。我们的结果揭示了 CPB 结构内复杂且快速发展的分层孔隙网络。借助额外的弛豫-交换相关性测量，将弛豫峰分配给孔隙水种群和孔间交换动力学的组合。根据观察到的交换过程和不断演变的孔隙表面化学，进一步讨论了高盐度和自来水水合材料的水合行为的差异。
更新日期：2021-09-15
中文翻译：
用二维核磁共振弛豫相关测量观察水泥浆回填物的孔隙结构演变
水泥浆回填 (CPB) 技术是处理地下空隙中固体采矿废物的一种受欢迎的方法。在高盐度水引发的水合作用条件下，了解 CPB 不断演变的材料特性对于提高其在采矿作业中作为被动支撑材料的利用至关重要。在这里，我们使用1 H NMR T 1 – T 2研究 CPB 样品的水合行为在低磁场 (2 MHz)、对比高盐度和自来水水合 CPB 下的相关性测量，该 CPB 包含 5 wt% 的水泥粘合剂，持续时间长达 28 天。我们的结果揭示了 CPB 结构内复杂且快速发展的分层孔隙网络。借助额外的弛豫-交换相关性测量，将弛豫峰分配给孔隙水种群和孔间交换动力学的组合。根据观察到的交换过程和不断演变的孔隙表面化学，进一步讨论了高盐度和自来水水合材料的水合行为的差异。
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