Influence of different W/C on the performances and hydration progress of dual liquid high water backfilling material

Zuo, Jianping; Hong, Zi-jie; Xiong, Zuqiang; Wang, Cheng; Song, Hongqiang

doi:10.1016/j.conbuildmat.2018.09.146

Cited by 47 publications

(17 citation statements)

References 20 publications

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“…The content and structure of ettringite and C-S-H is the main factor influencing the mechanic properties of the HWBM according to the previous reports 1,7,8 . These results indicate that there are different variation change on content of ettringite and C-S-H in the anodic region and cathodic region of samples after electrochemical treatment.…”

Section: Mineralogical Composition Change Of the Hwbmsmentioning

confidence: 89%

“…which further causes the mechanic properties and electrical resistivity of the HWBM to change because the content and structure of ettringite and C-S-H are the main factors influencing the mechanic properties of the HWBM. Generally, it is believed that the more ettringite and C-S-H there are, the higher UCS, deformation modulus and elastic modulus are 1,7,8 . The results of XRD and SEM in "Mineralogical composition change of the HWBMs" and "Change in the microstructure of the HWBMs" also indicate that the electrochemical treatment has obvious effect on the formation of the hydration products in the samples.…”

Section: Mineralogical Composition Change Of the Hwbmsmentioning

confidence: 99%

“…As an excellent mine backfilling material, the high water backfill material (HWBM) has the advantages of good liquidity, short initial setting time, and good early strength. However, the filling cost and strength of HWBM will increase with a decreasing the water cement ratio (W/C), while the strength will decrease with an increasing the W/C 1 . In addition, the disadvantage of poor toughness and small compressibility also limits the application of HWBMs for use as mine backfilling materials 2 , 3 .…”

Section: Introductionmentioning

confidence: 99%

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Experimental and mechanistic research on modifying the mechanic properties of the high water backfill material by electrochemical treatment

Xie

Sun

Wang

et al. 2020

Sci Rep

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To promote the engineering applications of high water backfill materials (HWBM) in mining, a series of experiments are performed to investigate the effects of the direct current (DC) electric field on the mechanic properties and electrical resistivity of HWBMs. Based on X-ray diffraction (XRD) and scanning electron microscopy (SEM) investigations, the influence of electrochemical treatment on the hydration products and the microstructure of the HWBM was studied. The results show that the peak strength, elastic modulus, deformation modulus and electrical resistivity of the HWBM samples all first increased and then decreased with the increasing of the potential gradient, and the peak points appeared when the potential gradient was 0.2 V/cm. The anisotropy of content of ettringite and calcium silicate hydrates (C–S–H) increased betweent the anodic and cathodic regions of samples. Meanwhile, microstructure in the anodic region of the samples was more stable after electrochemical treatment, which indicates that the different variation of mineralogical compositions and microstructures in different regions of the samples are the primary factors affecting the mechanic properties and electrical resistivity of the HWBM. Therefore, the electrochemical method is a potential technology to modify the engineering properties of the HWBM.

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Section: Mineralogical Composition Change Of the Hwbmsmentioning

confidence: 89%

Section: Mineralogical Composition Change Of the Hwbmsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental and mechanistic research on modifying the mechanic properties of the high water backfill material by electrochemical treatment

Xie

Sun

Wang

et al. 2020

Sci Rep

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“…In the past [13], the environment wherein HWMs is used as filling material was relatively stable; thus, research on HWM has mainly focused on topics such as hydration hardening mechanism, physical and mechanical properties, and long-term creep characteristics [21,22]. More environmental factors should be considered for evaluating the stability of HWM as grouting materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of Dry‐Wet Cycling on the Mechanical Properties of High‐Water Materials

Zhou

Liu

et al. 2020

Advances in Civil Engineering

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As a new grouting reinforcement material, high-water materials (HWMs) are being increasingly applied in different fields. This means that the environment in which these HWMs are employed are varied and increasingly complex. The dehydrating and saturation cycle of HWM caused by changes in the environment is referred to as the dry-wet cycle. To explore the influence of the dry-wet cycle on the mechanical properties of HWMs, uniaxial compression tests were performed on specimens with different water-to-cement ratios under different dry-wet cycles. The degradation rate of the peak stress and elastic modulus increased with an increase in the water-to-cement ratio. The failure mode of specimens changed from splitting failure to shear-splitting failure during the dry-wet cycle. The results of scanning electron microscope and X-ray diffraction showed that an HWM with a low water-to-cement ratio is relatively dense; therefore, the carbonization process is slow during dehydration. Raw materials were present after hydration and hardening reaction. Thus, the strength recovery ability is strong in materials with a low water-to-cement ratio during the saturation process. Finally, the experimental results can provide guidance for selecting materials with different water-to-cement ratios and control measures for dry-wet cycle can be determined according to different engineering environments.

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“…Hou et al [ 31 ] proposed a porous media slurry diffusion model considering the variation of viscosity with time based on the Bingham fluid constitutive model, and verified the grouting diffusion model by numerical simulation. Zuo et al [ 32 ] studied the effect of water:cement ratio on the viscosity of double-liquid cement-based grouting materials. The results show that the viscosity of single slurry decreases with the increase of water:cement ratio, and when the two kinds of slurry are mixed, the viscosity appears inflection point.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on Viscosity Characteristics of Grouting Slurry in a High Ground Temperature Environment

2020

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The grouting method is a technical means to prevent and control the thermal damage of the tunnel with high ground temperature in the underground hot water area, and the viscosity characteristic of the slurry is the key factor of grouting treatment. When grouting in high ground temperature geological conditions, the slurry inevitably has both time-varying and temperature-varying characteristics of viscosity in the process of filling high-temperature fissures and plugging geothermal water. At present, the research on the viscosity characteristics of slurry at high temperature is rarely reported in the literature. In this paper, laboratory tests were carried out to measure the time-varying viscosity of ordinary cement slurry; cement-sodium silicate slurry, widely used in engineering; and high ground temperature grouting slurry (HGTGS), independently developed by our research group, at different preheating temperatures (20, 40, 60, 80 °C). The viscosity function curves of the three kinds of slurry were obtained by function fitting method, and the viscosity variation law of slurry was analyzed. The study found that the time-varying process of viscosity of the cement-sodium silicate slurry and the HGTGS in specific temperature conditions can be divided into two stages: The slow rising period of viscosity and the rapid rising period of viscosity. Whereas, the time-varying process of viscosity of ordinary cement slurry in specific temperature conditions includes only one stage of the slow rising period of viscosity. The viscosity of ordinary cement slurry and cement-sodium silicate slurry increases with the increase of temperature, while the viscosity of the HGTGS decreases with the increase of temperature. There are corresponding viscosity time-varying equations for the three kinds of slurry in different temperature conditions. The viscosity time-varying equation of the ordinary cement slurry accords with the linear function form, and the viscosity time-varying equation of the cement-sodium silicate slurry accords with the power-law function form. The viscosity time-varying equation of the HGTGS conforms to the exponential function form. On this basis, the unified description equation of the viscosity characteristics of grouting slurry in high ground temperature and the applicability of different types of grouting materials are obtained. This study has a certain reference value and guidance for theoretical analysis, numerical simulation and engineering application of grouting in high ground temperature environment.

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Influence of different W/C on the performances and hydration progress of dual liquid high water backfilling material

Cited by 47 publications

References 20 publications

Experimental and mechanistic research on modifying the mechanic properties of the high water backfill material by electrochemical treatment

Experimental and mechanistic research on modifying the mechanic properties of the high water backfill material by electrochemical treatment

Effect of Dry‐Wet Cycling on the Mechanical Properties of High‐Water Materials

Experimental Research on Viscosity Characteristics of Grouting Slurry in a High Ground Temperature Environment

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