Correlative Mechanism of Hydraulic-mechanical Property in Cemented Paste Backfill

Hydraulic characteristic is a good indication of binder hydration, which determines the strength development of cemented paste backfill（CPB）. Therefore, the hydraulic characteristic should be communicated with the mechanical property to provide an advanced knowledge that can help mine workers make a...

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Bibliographic Details
Published in:Journal of Wuhan University of Technology. Materials science edition 2017-06, Vol.32 (3), p.579-585
Main Author: 王勇 吴爱祥 WANG Shaoyong WANG Hongjiang YANG Liuhua WANG Yiming RUAN Zhu＇en
Format: Article
Language:English
Subjects:
Backfill
Cementing
Cementitious Materials
Chemistry and Materials Science
Compressive strength
Correlation
Couplings
Exponential functions
Hardening
Hydration
Hydraulics
Materials Science
Mechanical properties
Mechanics (physics)
Moisture content
Suction
体外循环
体积含水量
力学性能
无侧限抗压强度
机理
水力特性
胶结材
非线性增长
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Summary:Hydraulic characteristic is a good indication of binder hydration, which determines the strength development of cemented paste backfill（CPB）. Therefore, the hydraulic characteristic should be communicated with the mechanical property to provide an advanced knowledge that can help mine workers make a rational strategy and reduce the mining cycle. An experimental program was performed to obtain the hydraulic（monitored by suction and volumetric water content） and mechanical properties（unconfined compressive strength（UCS） test） of CPB at the 28 days curing age. According to the monitoring and testing results, the relationships between the hydration reaction rate and volumetric water content（VWC）, suction and VWC, suction and UCS were established. The hydration degree showed a liner rise as the VWC decreased. Curves of the VWC and UCS were featured with a nonlinear reduction and nonlinear growth（both are exponential functions） as the suction rising, respectively. These established relationships validated the strong correlative mechanism of hydraulic and mechanics behavior for CPB. Also, the results of the present research indicated that the hydraulic characteristics and mechanical property were strongly coupled. These correlations and couplings will be of great importance to understand the hardening process of CPB and bring to a safe CPB field operation.
ISSN:1000-2413
1993-0437
DOI:10.1007/s11595-017-1637-3