Microscopic characterization and strength characteristics of cemented backfill under different humidity curing conditions
Under different exploitive conditions, the humidity levels of the backfill stopes are not the same. Humidity greatly affects the strength and microscopic characterization of the backfill. Cemented paste backfill (CPB) specimens were cured using 0, 30, 70% and standard curing (20°C, 99%) under four d...
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2019-12-01
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doaj-7744df71e3104268bdc9fcba32cfbe152020-11-25T03:06:28ZengThe Royal SocietyRoyal Society Open Science2054-57032019-12-0161210.1098/rsos.191227191227Microscopic characterization and strength characteristics of cemented backfill under different humidity curing conditionsJianhua HUFengwen ZhaoQifan RenYe KuangTan ZhouZhouquan LuoUnder different exploitive conditions, the humidity levels of the backfill stopes are not the same. Humidity greatly affects the strength and microscopic characterization of the backfill. Cemented paste backfill (CPB) specimens were cured using 0, 30, 70% and standard curing (20°C, 99%) under four different humidity conditions. At 28 days, nuclear magnetic resonance (NMR) and scanning electron microscopy (SEM) techniques were used to obtain the microscopic features of the CPB specimens. The relationships between the permeability and uniaxial compressive strength (UCS) of the CPB specimens, and the microscopic characteristics of the CPB specimens, were established. The results showed the following: (i) The permeability of the CPB had an exponential functional relationship with its stone powder content. (ii) The stone powder content of CPB and the peak area of the T2 spectrum are negatively correlated with the UCS. However, there was a T2 peak area corresponding to the worst UCS with the same stone powder content. (iii) The peak area of the T2 spectrum showed that the proportion of area of a small pore size was more than 80%, indicating that the pore size was mainly small. The pore diameter of small pores was linearly and inversely proportional to the UCS of the specimens. It can be found that the factors affecting the strength characteristics of CPB include not only the stone powder content, but also the curing conditions of different humidity.https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.191227humiditypermeabilityt2 spectral areaucsweighted average t2 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jianhua HU Fengwen Zhao Qifan Ren Ye Kuang Tan Zhou Zhouquan Luo |
spellingShingle |
Jianhua HU Fengwen Zhao Qifan Ren Ye Kuang Tan Zhou Zhouquan Luo Microscopic characterization and strength characteristics of cemented backfill under different humidity curing conditions Royal Society Open Science humidity permeability t2 spectral area ucs weighted average t2 |
author_facet |
Jianhua HU Fengwen Zhao Qifan Ren Ye Kuang Tan Zhou Zhouquan Luo |
author_sort |
Jianhua HU |
title |
Microscopic characterization and strength characteristics of cemented backfill under different humidity curing conditions |
title_short |
Microscopic characterization and strength characteristics of cemented backfill under different humidity curing conditions |
title_full |
Microscopic characterization and strength characteristics of cemented backfill under different humidity curing conditions |
title_fullStr |
Microscopic characterization and strength characteristics of cemented backfill under different humidity curing conditions |
title_full_unstemmed |
Microscopic characterization and strength characteristics of cemented backfill under different humidity curing conditions |
title_sort |
microscopic characterization and strength characteristics of cemented backfill under different humidity curing conditions |
publisher |
The Royal Society |
series |
Royal Society Open Science |
issn |
2054-5703 |
publishDate |
2019-12-01 |
description |
Under different exploitive conditions, the humidity levels of the backfill stopes are not the same. Humidity greatly affects the strength and microscopic characterization of the backfill. Cemented paste backfill (CPB) specimens were cured using 0, 30, 70% and standard curing (20°C, 99%) under four different humidity conditions. At 28 days, nuclear magnetic resonance (NMR) and scanning electron microscopy (SEM) techniques were used to obtain the microscopic features of the CPB specimens. The relationships between the permeability and uniaxial compressive strength (UCS) of the CPB specimens, and the microscopic characteristics of the CPB specimens, were established. The results showed the following: (i) The permeability of the CPB had an exponential functional relationship with its stone powder content. (ii) The stone powder content of CPB and the peak area of the T2 spectrum are negatively correlated with the UCS. However, there was a T2 peak area corresponding to the worst UCS with the same stone powder content. (iii) The peak area of the T2 spectrum showed that the proportion of area of a small pore size was more than 80%, indicating that the pore size was mainly small. The pore diameter of small pores was linearly and inversely proportional to the UCS of the specimens. It can be found that the factors affecting the strength characteristics of CPB include not only the stone powder content, but also the curing conditions of different humidity. |
topic |
humidity permeability t2 spectral area ucs weighted average t2 |
url |
https://royalsocietypublishing.org/doi/pdf/10.1098/rsos.191227 |
work_keys_str_mv |
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