Prediction of Concrete Pumping Using Various Rheological Models

Choi, Myoung Sung; Kim, Young Jin; Kim, Jin Keun

doi:10.1007/s40069-014-0084-1

Cited by 42 publications

(14 citation statements)

References 21 publications

(39 reference statements)

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“…In addition Mahaut et al [32] postulated that "the structuration rate Athix has the same dependence on the coarse particle volume fraction as the yield stress". Similar models for relating properties of a suspension to suspending paste are presented and discussed in [33][34][35]. These findings imply that the parameters identified through a proposed approach on a concrete with finer aggregates could be applied to concrete with coarse aggregates using a factor similar to that of Eq.…”

Section: Additional Commentssupporting

confidence: 55%

Direct printing test for buildability of 3D-printable concrete considering economic viability

Nerella

Krause

Mechtcherine

2020

Automation in Construction

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Buildability, i.e. the ability of a deposited material bulk to retain its dimmensions under increasing load, is an inherent prerequisite for formwork-free digital construction (DC). Since DC processes are relatively new, no standard methods of characterization are available yet. The paper at hand presents practice-oriented buildabilty criteria by taking various process parameters and construction costs into consideration. In doing so, direct links between laboratory buildability tests and target applications are established. A systematic basis for calculating the time interval (TI) to be followed during laboratory testing is proposed for the full-width printing (FWP) and filament printing (FP) processes. The proposed approach is validated by applying it to a high-strength, printable, fine-grained concrete. Comparative analyses of FWP and FP revealed that to test the buildability of a material for FP processes, higher velocities of the printhead should be established for laboratory tests in comparison to those needed for FWP process, providing for equal construction rates. Highlights:Practice-oriented criteria for characterizing buildability are proposed.The applicability of the model in quantifying the economic viability of 3D-printing is demonstrated. Specimen height and time interval are specified as parameters for buildability tests on printable concretes. Proposed buildability criteria are validated by tests on a printable concrete. Variations regarding buildability test specifications for full-width and filament printing techniques are described.

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Section: Additional Commentssupporting

confidence: 55%

Direct printing test for buildability of 3D-printable concrete considering economic viability

Nerella

Krause

Mechtcherine

2020

Automation in Construction

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“…Numerical models can help in understanding the SIPM during pumping and characteristics of LL, as well as predicting pumping pressures. However, such tools have so far been simplified by the assumption of either a single-fluid homogeneous medium [23,24,25,28,34] or discrete granular elements [35]. In the case of concretes with high granular fractions, the interactions between aggregate and paste are crucial.…”

Section: Pumpingmentioning

confidence: 99%

Extrusion-based additive manufacturing with cement-based materials – Production steps, processes, and their underlying physics: A review

Mechtcherine

Bos

Perrot

et al. 2020

Cement and Concrete Research

374

127

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This article offers a comprehensive overview of the underlying physics relevant to an understanding of materials processing during the various production steps in extrusion-based 3D Concrete Printing (3DCP). Understanding the physics governing the processes is an important step toward the purposeful design and optimization of 3DCP systems as well as their efficient and robust process control. For some processes, analytical formulas based on the relevant physics have already enabled reasonable predictions with respect to material flow behavior and buildability, especially in the case of relatively simple geometries. The existing research in the field was systematically compiled by the authors in the framework of the activities of the RILEM Technical Committee 276 "Digital fabrication with cementbased materials". However, further research is needed to develop reliable tools for the quantitative analysis of the entire process chain. To achieve this, experimental efforts for the characterization of material properties need to go hand in hand with comprehensive numerical simulation.

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“…In order to obtain this type of pumpability, the mix must be dense, cohesive, and have a sufficient paste and mortar fraction to minimize voidage. The mortar volume required depends on the line size, efficiency of concrete pump, and pressure available for pumping the concrete [27,28].…”

Section: Concrete For Pumpingmentioning

confidence: 99%

Impact of crushed mineral aggregate on the pumpability of concrete during transport and placement

et al. 2016

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In the spirit of the sustainable buildings, and with the goal of protection of river courses, in the near future an already announced directive ordering closing down of a large number of river aggregate dredging operations will be adopted. For that reason, usage of crushed mineral aggregate in concrete mixes is increasing. Irrespective of downsides of the fined crushed mineral aggregate, such as the presence of fine particles bordering the upper permissible limit and the unfavorable shape of the grain of the course aggregate for obtaining liquid consistency required for the pumpable concrete, the demanded pumpability of concrete during transport and placement has been achieved. By adding admixtures to concrete, the required concrete properties, such as: frost resistance, simultaneous frost and salt resistance and water tightness have been achieved. [Projekat Ministarstva nauke Republike Srbije, br. TR 36017: Utilization of by - products and recycled waste materials in concrete composites in the scope of sustainable construction development in Serbia: investigation and environmental assessment of possible applications]

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Prediction of Concrete Pumping Using Various Rheological Models

Cited by 42 publications

References 21 publications

Direct printing test for buildability of 3D-printable concrete considering economic viability

Direct printing test for buildability of 3D-printable concrete considering economic viability

Extrusion-based additive manufacturing with cement-based materials – Production steps, processes, and their underlying physics: A review

Impact of crushed mineral aggregate on the pumpability of concrete during transport and placement

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