Curing time effect on consolidation behaviour of cemented paste backfill containing different cement types and contents

被引:173
作者
Yilmaz, Erol [1 ,2 ]
Belem, Tikou [1 ]
Bussiere, Bruno [1 ]
Mbonimpa, Mamert [1 ]
Benzaazoua, Mostafa [1 ]
机构
[1] UQAT, Dept Appl Sci, Rouyn Noranda, PQ J9X 5E4, Canada
[2] Cayeli Bakir Isletmeleri AS, Quantum Minerals Ltd 1, TR-53200 Cayeli, Rize, Turkey
基金
加拿大创新基金会; 加拿大自然科学与工程研究理事会;
关键词
Mine tailings; Paste backfill; CUAPS; Consolidation; Pore pressure; Curing; Binder hydration; HYDRAULIC CONDUCTIVITY; TAILINGS; STRENGTH; PERFORMANCE; TEMPERATURE; STABILITY;
D O I
10.1016/j.conbuildmat.2014.11.008
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The one-dimensional consolidation properties of early age cemented paste backfill (CPB) are useful for the estimation of design parameters for underground stope filling purpose as well as for numerical modelling purposes. Many studies have investigated the consolidation characteristics of mine tailings, but not in CPBs, mainly because consolidation was not initially considered as an essential property and the available testing equipment was not suitable. In this paper, the curing time effect of different types of binder and their content on the one-dimensional consolidation characteristics of CPB samples was investigated using an improved lab apparatus called CUAPS (curing under applied pressure system). As the drainage ability and the saturated hydraulic conductivity k(sat) are closely linked with consolidation, the change in the k(sat) at the end of the consolidation process was also investigated for tailings (control) and CPB materials. Results indicate that adding binder to the mixtures considerably affects the void ratio and increases compression resistance. The excess pore water pressure indicates that binder reduces the peak value reached for all pressure increments while the k(sat) decreases with time. Some empirical equations to estimate the one-dimensional consolidation characteristics of CPB samples are finally proposed and discussed. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:99 / 111
页数:13
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