Effect of equipment on spray velocity distribution in shotcrete applications

Ginouse, Nicolas; Jolin, Marc; Bissonnette, Benoı̂t

doi:10.1016/j.conbuildmat.2014.07.116

Cited by 30 publications

(16 citation statements)

References 12 publications

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“…The peripheral lubricating layer found in a hose when pumping concrete results in a higher concentration of paste and fine aggregates in the edges of the spray. For subsequent modeling on rebound, the combination of the information found here on mass flux along with the velocity profiles [16] opens the way to the first ever model of shotcrete placement at the spray scale. It is believed that this can have important impact on equipment design and selection in the future.…”

Section: Discussionmentioning

confidence: 98%

“…As conducted in a previous work dealing with velocity field in shotcrete spray [16], such normalized parameter representations are very helpful for characterizing the distribution of the mass flux density around a maximum value j max reached at the nozzle axis for g = 0 and decreasing toward the spray edges (g = 1) following a unique profile function F(g) also plotted in Fig. 6(b).…”

Section: Spray Flow Distributionmentioning

confidence: 97%

“…Indeed, while a previous paper concentrated on the velocities of the particles [16], the objective in the present case is to capture in-flight particles without the effect of impact or rebound. This spatial mass flow or more precisely the mass flux density is essential for any subsequent rebound investigations.…”

Section: Assessment Of the Incident Spray Flow Patternmentioning

confidence: 99%

“…As stated in previous work [6] on rebound mechanisms, incident kinetic energy or impact energy conveyed by the traveling sprayed particles is a key parameter in rebound prediction and eventual modeling. This impact energy is related to the particles' masses and velocities; although the impact velocity has been studied at the single particle scale [13][14][15] and more recently at the spray scale [16], no information on the incident mass flow of material is currently available for pursuing the investigation on rebound. In this context, a novel approach experimentally characterizing the flow of wet sprayed material exiting a stationary nozzle is presented in this paper.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Investigation of spray pattern in shotcrete applications

Ginouse

Jolin

2015

Construction and Building Materials

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Section: Discussionmentioning

confidence: 98%

Section: Spray Flow Distributionmentioning

confidence: 97%

Section: Assessment Of the Incident Spray Flow Patternmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigation of spray pattern in shotcrete applications

Ginouse

Jolin

2015

Construction and Building Materials

Self Cite

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“…At present, during the spraying process, many of the operating parameters are determined approximately based on operator experience. e main focus is on the shotcrete materials [5][6][7][8], material properties [9][10][11][12], and spray equipment [13,14]. Most existing theoretical studies have investigated aggregate rebound [15][16][17][18], while research into the impact of slurry on walls is lacking.…”

Section: Introductionmentioning

confidence: 99%

Influences on Shotcrete Rebound from Walls with Random Roughness

Wenhui

Pan

et al. 2018

Advances in Materials Science and Engineering

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Concrete slurry can be sprayed on walls for reinforcement; however, there is a certain amount of rebound which is hazardous, lowers production quality, and wastes material. To investigate this problem, we studied single slurry droplets at the mesoscopic level. We deduced the factors influencing droplet spreading and wall adhesion to create models of shotcrete rebound. en, a numerical simulation orthogonal experiment investigating droplet-wall impacts was performed. e relationship between the spreading coefficient and each influencing factor is discussed, and numerical models are presented. Finally, the obtained models are verified by physical experiments. e results show that the spreading coefficient can be used to better characterize the effect of slurry droplet adhesion to walls. Modeled and experimentally observed droplet-wall impacts showed good consistency. e influence of each factor on the spreading coefficient was determined in the following order of strength: droplet velocity and viscosity, wall roughness, and surface tension. e spreading coefficient increases with velocity, decreases with viscosity and roughness, and increases first and then decreases with surface tension. is study improves the fluid dynamics-based theory of multiphase flow in concrete slurry and provides a theoretical basis for mitigating shotcrete rebound.

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Shotcrete 3D Printing ‐ Effect of material‐process interaction on the global and local material density

Böhler,

Freund,

Mai

et al. 2023

ce papers

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Shotcrete 3D Printing is a 3D printing process in which the concrete is applied layer by layer using a wet mix process. In the print process, a large number of different process as well as material parameters can be varied, which also influence the hardened concrete properties. A systematic understanding of the interaction between material and process is required to define limits for material and process control variables with respect to the resulting component quality. Therefore, in this paper we present results on the effect of concrete volume flow (0.4; 0.8 m3/h), air volume flow (30; 40; 50 m3/h) and accelerator dosage (0; 3; 6 % by weight of cement) on global density, local density distribution as well as flexural strength. The results show that the combination of an increasing concrete volume flow, a decreasing air volume flow and an increasing accelerator dosage lead to a decrease in global density and flexural strength. A high correlation between the global density and flexural strength can be demonstrated despite the layer‐by‐layer fabrication. In addition, an inhomogeneous density distribution over the cross section is shown. Finally, the underlying mechanisms are discussed regarding the influence of the material and process parameters.

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Effect of equipment on spray velocity distribution in shotcrete applications

Cited by 30 publications

References 12 publications

Investigation of spray pattern in shotcrete applications

Investigation of spray pattern in shotcrete applications

Influences on Shotcrete Rebound from Walls with Random Roughness

Shotcrete 3D Printing ‐ Effect of material‐process interaction on the global and local material density

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