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Title: Experimental research on influence of water cement ratio on mechanical characteristics of the high-water-content material
Authors: Zhang, Y
Liu, C
Xie, H
Lu, B
Wang, C 
Zou, J
Keywords: High water material
Strength characteristics
Water cement ratio
Issue Date: 2017
Publisher: Editorial Department of Journal of Sichuan University
Source: Gongcheng kexue yu jishu/advanced engineering science, 2017, v. 49, p. 115-120 and 127 How to cite?
Journal: Gongcheng kexue yu jishu/advanced engineering science 
Abstract: Backfill mining has been an effective way of realizing green mining, and the key part of its application is to research the filling materials. The high-water material is a new kind of filling material, the physical and mechanical properties of high-water material directly affect the filling stability. Solid particles and water are the main components of high-water material, the relative content of which directly affect its physical and mechanical properties. Based on a series of macroscopic and microscopic tests, the basic physical properties and uniaxial compressive strength characteristics of high-water material with different water cement ratio were studied. The results indicated that 1) The microstructure of high-water material stone exhibited a network structure and was very porous, so it could absorb quantities of water which was greater than its weight. The greater the water cement ratio was, the sparser the fissures in reticular formation would be and thus the larger the reticular formation would be. The phenomenon of dehydration become much more evident when the high-water material's water cement ratio got larger and when it was under the action of uniaxial compression. 2) The stress-strain curve of high-water material was similar to that of rock material, however, the high-water material exhibited high plasticity and could maintain better integrity after reaching peak strength. 3) Under uniaxial compression, the high-water material often showed “X ” type shear failure when the water cement was relatively high, but it often showed splitting failure when the water cement was relatively low. The uniaxial peak strength and residual strength of high-water material reduced with the increase of its water cement ratio. With the decrease of water cement ratio, the stress-strain curve at the peak strength become much steeper and the strength after the peak stage reduced much faster while its residual strength remained a higher level. 4) The high-water material displays excellent plastic properties and high residual strength, which is suitable for filling material.
ISSN: 2096-3246
DOI: 10.15961/j.jsuese.201600956
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