Segregation of granular materials in a pulsating pumping regime

Haustein, M.; Zhang, Ge; Schwarze, Rüdiger

doi:10.1007/s10035-019-0967-6

Cited by 7 publications

(4 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The participating research projects have aimed to understand the principal reasons for the shortcomings in the structure of rheological knowledge and experience, working to fill these gaps using advanced analytical [11][12][13][14][15][16][17], experimental [18][19][20][21][22][23][24], and numerical tools [25][26][27][28][29][30]. Special attention has been paid to aspects such as testing fresh cement-based suspensions [9; 31-33] capturing the effects of binder flocculation and early hydration in the…”

Section: Scientific Outcomes Of Spp 2005 Projectsmentioning

confidence: 99%

“…The researchers have also proposed new strategies and concepts for the description of deformation and flow properties of fresh concrete based on an understanding of microscale processes, e.g., magnitude of yield stress [29] and structural build-up [24; 32] in the context of additive manufacturing, micro-sedimentation behavior of cement suspensions and bleeding [33]. Furthermore, some representative mesoscopic processes such as segregation [28] and shear-induced particle migration (SIPM) [37] were experimentally quantified and numerically modelled. The changes in rheological properties caused by SIPM were found to be great enough to influence the definition of the flow pattern as plug-or shear-flow and, as a consequence, that of the discharge rate of pumped concrete as well [37; 38].…”

Section: Development Of Generalised Data Conversion Schemementioning

confidence: 99%

See 1 more Smart Citation

Mastering the rheology of fresh concrete: New knowledge from a DFG priority program SPP 2005

Mechtcherine

2023

ce papers

View full text Add to dashboard Cite

The processing of cement‐based building materials represents the technological core in the construction and maintenance of structures. However, a scientific framework for mastering rheology‐based processes is still in an early stage of its development. The reason for this is the extremely high complexity of cementitious systems. This complexity includes the high chemical reactivity of mineral binders, the complex multi‐phase nature of fresh concrete or mortar, and a wide range of deformation rates during various technological processes, which result in extremely high demands for characterization and simulation methods. The goal of the DFG Priority Program SPP 2005 “Opus Fluidum Futurum – Rheology of reactive, multiscale, multiphase construction materials” is to ascertain and describe the scientific fundamentals for understanding and, subsequently, designing rheology‐based construction processes as well as for developing innovative, sustainable building materials and associated pioneering processing technologies. The article at hand presents the purpose and the structure of the collaborative research as well as the achievements of the priority program. Furthermore, it offers some insights into ongoing and planned research.

show abstract

Section: Scientific Outcomes Of Spp 2005 Projectsmentioning

confidence: 99%

Section: Development Of Generalised Data Conversion Schemementioning

confidence: 99%

Mastering the rheology of fresh concrete: New knowledge from a DFG priority program SPP 2005

Mechtcherine

2023

ce papers

View full text Add to dashboard Cite

show abstract

“…Cao et al [24] studied the effect of coarse aggregate volume fraction on yield stress by using the DEM model of fresh concrete, and then they clarified the effect of coarse aggregate volume fraction on pumping pressure and wall wear. Haustein et al [25] used DEM to study the segregation of concrete particles under pulsating pumping regime.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Motion Behavior of Concrete in Pump Pipe by DEM

Hao

Jin

et al. 2021

Advances in Civil Engineering

View full text Add to dashboard Cite

In this paper, the mesocalibration test was used to measure the contact parameters (restitution coefficient, rolling friction coefficient, static friction coefficient, and surface energy) between coarse aggregate particles and mortar particles in Discrete Element Method (DEM) model of concrete. Then, the DEM model of concrete slump was established according to the coarse aggregate gradation to study the flow behavior of coarse aggregate in fresh concrete. The slump test result was compared with the output of the slump DEM model with high consistent, indicating the promising reliability of the mesocalibration test. Finally, based on the mesocalibration test results, the DEM model of pumping concrete was established. It was obtained that the pumping pressure calculated by the numerical model was similar to that of the pumping test with satisfactory accuracy better than the concrete pumping pressure calculated according to the rheological test results of concrete and lubricating layer. On this basis, the movement trajectory of coarse aggregate in the pump pipe was analyzed and the influence of coarse aggregate on the pumping performance of concrete was revealed.

show abstract

“…Granular materials segregate due to differences in their size, shape and density [1][2][3]. Segregation is very importance in industry as well as in various natural processes [4][5][6]. Many researchers have studied this phenomena in last three decades, in most of the cases material fed was continuous [7][8].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of segregation of granular mixtures during heap formation

Gharat¹

2021

EPJ Web Conf.

View full text Add to dashboard Cite

The present study is on segregation of granular mixtures during heap formation in a quasi two-dimensional rectangular bin where binary mixture of a specified composition is poured intermittently into the auxiliary hopper and then allowed to pass through the gap (k = 10 mm) between the divider and the plate and finally settle on to the heap. The profiles of number fraction of big particles are plotted along the flow directions to study the segregation phenomena for surface profile. It shows that larger particles travel more distance and smaller particles settle near the pouring point for all cases studied.

show abstract

Segregation of granular materials in a pulsating pumping regime

Cited by 7 publications

References 36 publications

Mastering the rheology of fresh concrete: New knowledge from a DFG priority program SPP 2005

Mastering the rheology of fresh concrete: New knowledge from a DFG priority program SPP 2005

Simulation of Motion Behavior of Concrete in Pump Pipe by DEM

Experimental investigation of segregation of granular mixtures during heap formation

Contact Info

Product

Resources

About