Research on Dust Suppression Technology of Shotcrete Based on New Spray Equipment and Process Optimization

Li, Pengcheng; Zhou, Zhongkui; Chen, Lianjun; Liu, Guoming; Xiao, Wei

doi:10.1155/2019/4831215

Cited by 17 publications

(13 citation statements)

References 44 publications

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“…Shotcrete technique is widely used in the repair industry, underground support, slope stabilization, and in some areas that are difficult to reach with conventional concrete [1][2][3][4][5]. In some engineering applications, shotcrete suffers the pressure from the surrounding environment, such as the surrounding rock in mining roadway.…”

Section: Introductionmentioning

confidence: 99%

Effects of PET Fibers on Pumpability, Shootability, and Mechanical Properties of Wet‐Mix Shotcrete

Cui

Liu

Wang

et al. 2019

Advances in Civil Engineering

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Polyethylene terephthalate (PET) fiber from waste plastic bottles is an environmentally friendly fiber that can improve the mechanical properties of wet-mix shotcrete. The main objective of this paper is to investigate the effects of PET fiber parameters on pumpability, shootability, and mechanical properties of wet-mix shotcrete. For this purpose, the orthogonal test based on three factors and three levels was conducted. The width, length, and content of PET fiber were selected as the experimental variables. The tests of wet-mix shotcrete reinforced by PET fibers were carried out, along with properties tests such as slump, pressure drop, build-up thickness, compressive strength, and splitting strength. The results showed the change trend of shotcrete performances with increasing PET fiber parameters (width, length, and content). According to the orthogonal test, PET fiber parameters were determined (1 mm width, 20 mm length, and 5 kg/m3 content). Furthermore, relationships between slump and pumpability and shootability were explored, as well as the relationships between pumpability, shootability, and mechanical properties. It was found that pressure drop and compressive strength had the strongest negative linear relationship among all fitting relationships. We hoped that this study could contribute the useful information for the application of wet-mix shotcrete mixed with PET fibers.

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Section: Introductionmentioning

confidence: 99%

Effects of PET Fibers on Pumpability, Shootability, and Mechanical Properties of Wet‐Mix Shotcrete

Cui

Liu

Wang

et al. 2019

Advances in Civil Engineering

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“…Having studied the technological modes of applying the mixture by the method of guniting on hard unyielding surfaces, we can conclude that the technology for applying building mixtures is formed depending on changes in a number of factors [1][2][3]:…”

Section: Introductionmentioning

confidence: 99%

Advantages of applying the mixture when guniting on vertical surfaces of building envelope

et al. 2021

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Having studied the technological modes of applying the mixture by the guniting method on hard unyielding surfaces, we can conclude that the technology for applying building mixtures is formed depending on changes in a number of factors (including the strength characteristics and the rebound of the mixture from the vertical surface). Experimental study of the influence of the technological parameters of application on the efficiency of guniting with the classical method and application using a nozzle for vortex application allows us to visually detect the zones of rational application of this technology. Based on the experimental data, we carried out an analysis of the influence of the technological parameters of applying the mixture on the criterion indicators. For this, we investigated various methods [8, 9], processed the results and revealed dependencies, discovered unknown aspects of gunning with the use of a nozzle for vortex application of a construction mixture. The assessment showed a sufficient degree of coincidence of theoretical and experimental studies and the possibility of their practical application, on the basis of which we can conclude about the efficiency of the nozzle for the vortex application of the building mixture.

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“…In term of pumpability, most research so far has focused on both rheology of fresh concrete and the lubrication layer formed at the interface between the concrete and the wall of the pipe that is the dominant factor to facilitate the pump[1, [3][4][5][6]. From the point of view of forecasting and controlling pumpability, it is crucial to measure the rheological parameters of wet-mix shotcrete [7][8][9][10][11][12][13][14][15]. Since the lubrication layer was first suggested by Alekseev and Weber [16,17], numerous attempts has been done to estimate lubrication layer thickness based on measuring the velocity profile frontier between concrete bulk and lubrication layer through using various advanced technology [1,4,[18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Pipe pressure of mining wet shot crete flowing in pipes

et al. 2021

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In order to explore the pressure change law of mining wet shotcrete in pipes, the rheological model was built based on rheology principle, and the computational formula of rheological parameters of wet shotcrete was deduced with the linear regression. 100 m full-scale pipeline platform of wet shotcrete was designed and built to study the relationship of pressure and other factors including flow rate, water cement ratio, mix proportion, and pipe bends. Results show: pipe pressure increases with the increase in flow rate and declines with the increase in water-cement ratio, the pressure may fluctuate with a high water cement ratio which can cause cement overhydration and bleeding separation. It will be more beneficial to transport materials if the continuous grading and straight pipe were considered. According to the tests of mix proportion 1:1.5:2.25, the pressure drop is 0.032 MPa·m−1 and the bend pressure drop is 1.3 times higher than in the straight line. We also conclude that solid phase pressure is bigger than liquid phase pressure and they both decline along the pipe based on FLUENT simulation. Finally, the formula of on-way resistance used in mine production was deduced.

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Research on Dust Suppression Technology of Shotcrete Based on New Spray Equipment and Process Optimization

Cited by 17 publications

References 44 publications

Effects of PET Fibers on Pumpability, Shootability, and Mechanical Properties of Wet‐Mix Shotcrete

Effects of PET Fibers on Pumpability, Shootability, and Mechanical Properties of Wet‐Mix Shotcrete

Advantages of applying the mixture when guniting on vertical surfaces of building envelope

Pipe pressure of mining wet shot crete flowing in pipes

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