Experimental Investigation on Mechanical Properties of Cemented Paste Backfill under Different Gradations of Aggregate Particles and Types and Contents of Cementing Materials

Wu, Jiangyu; Ma, Feng; Han, Guansheng; Ni, Xiaomin; Chen, Zhanqing

doi:10.1155/2019/9456861

Cited by 10 publications

(4 citation statements)

References 45 publications

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“…The size and content of aggregates have a significant impact on porosity and the interfacial transition zone (ITZ) [8]. The overall surface area of the aggregate is determined by the particle size [9], which in turn affects the paste film thickness and water film thickness [10]. A larger aggregate surface area results…”

Section: Introductionmentioning

confidence: 99%

Pore Structure Quantification and Fractal Characterization of MSA Mortar Based on 1H Low-Field NMR

Jiang,

He,

Tian

et al. 2024

Fractal Fract

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With the gradual depletion of natural sand due to over-exploitation, alternative building materials, such as manufactured sand aggregate (MSA), have attracted much attention. In order to interpret the evolution of pore structure and fractal characteristics in MSA mortar over long-term water saturation, the 1H low-field nuclear magnetic resonance (LF-NMR) relaxation method was used to investigate the temporal evolution of the pore structure in five single-graded MSA mortars and synthetic-graded mortars with small amplitudes in particle size. MSA presents a fresh rock interface characterized by a scarcity of pores, which significantly reduces the porosity of the mortar. The surface-to-volume ratio (SVR) is employed for characterizing the MSA gradation. Through an analysis of parameters, such as total porosity, pore gradation, pore connectivity, and pore fractal dimension of mortar, a correlation model between pore structure parameters and aggregate SVR is constructed. The fractal characteristics of pores and their variations are discussed under three kinds of pore gradations, and the correlation model between fractal dimension and porosity is established. These results demonstrate the high impermeability and outstanding corrosion resistance of synthetic-graded mortar. The fractal model of the pore structure evolution of MSA mortar has a guiding effect on the pore distribution evolution and engineering permeability evaluation of MSA mortar in engineering.

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Section: Introductionmentioning

confidence: 99%

Pore Structure Quantification and Fractal Characterization of MSA Mortar Based on 1H Low-Field NMR

Jiang,

He,

Tian

et al. 2024

Fractal Fract

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“…As a porous medium consisting mainly of cementing materials, waste rock aggregate, and pores [11], the AE characteristic of CPB is closely related to the choice and the ratio of cementing material, and the aggregate particle size grading, etc. [12][13][14]. Many types of researches indicated that the loading rate has a significant effect on the properties of materials.…”

Section: Introductionmentioning

confidence: 99%

Ae-Based Failure Warning Mechanism During Cemented Paste Backfilling: Experimental Investigation

Wang

et al. 2022

E3S Web Conf.

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To research the AE warning mechanism of cemented paste backfilling (CPB), the uniaxial compression test with AE monitoring was carried out on CPB. The effects of different moisture content, cement proportion, and loading rate on AE characteristics of CPB were analyzed. And a damage model based on AE is established. The results show that the increase of water content, gypsum content, and loading rate can enhance the ductility of CPB and lengthen the AE warning area. However, the increase of moisture content will lead to the delay of AE signal peak, which is bad for the early warning. With the increase of loading rate, the failure mode of specimens gradually changes from splitting failure to shear failure. The cracks produced under different failure modes can correspond to the peaks of AE signals. The damage model based on AE shows that the damage process of CPB samples can be divided into three stages, linear-exponential-linear. The experimental results can further research the optimal conditions for ae monitoring of backfill, and provide a theoretical basis for ae monitoring and warning of backfill.

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“…To study the variation of internal stress and the associated influencing factors, extensive laboratory experiments and in-situ monitoring programs have been conducted. For example, previous laboratory studies [16][17][18][19][20] have found that curing stress, water drainage, and structural filling properties (e.g., filling rate and sequences, filling time, filling interval time, and filling surface angle) affect the evolution of material properties (e.g., coefficient of permeability, shear strength parameters, elastic modulus, and so on) and the internal stress in CPB. Moreover, field monitoring programs have been carried out to assess the evolution of PWP [21] and total stress [22] in stopes with various mixture recipes and field conditions.…”

Section: Introductionmentioning

confidence: 99%

Analytical Assessment of Internal Stress in Cemented Paste Backfill

Liu

Cui

Wang

2020

Advances in Materials Science and Engineering

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To analytically describe the internal stress in a fill mass made of granular man-made material (cemented paste backfill, CPB), a new 3D effective stress model is developed. The developed model integrates Bishop effective stress principle, water retention relationship, and arching effect. All model parameters are determined from measurable experimental data. The uncertainties of the model parameters are examined by sensitivity analysis. A series of model application is conducted to investigate the effects of field conditions on the internal stress in CPB. The obtained results show that the proposed model is able to capture the influence of operation time, stope geometry, and rock/CPB interface properties on the effective stress in CPB. Hence, the developed model can be used as a useful tool for the optimal design of CPB structure.

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Experimental Investigation on Mechanical Properties of Cemented Paste Backfill under Different Gradations of Aggregate Particles and Types and Contents of Cementing Materials

Cited by 10 publications

References 45 publications

Pore Structure Quantification and Fractal Characterization of MSA Mortar Based on 1H Low-Field NMR

Pore Structure Quantification and Fractal Characterization of MSA Mortar Based on 1H Low-Field NMR

Ae-Based Failure Warning Mechanism During Cemented Paste Backfilling: Experimental Investigation

Analytical Assessment of Internal Stress in Cemented Paste Backfill

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