Flow conditions of fresh mortar and concrete in different pipes

Jacobsen, Stefan; Haugan, Lars; Hammer, Tor Arne; Kalogiannidis, Evangelos

doi:10.1016/j.cemconres.2009.07.005

Cited by 98 publications

(41 citation statements)

References 4 publications

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“…Earlier research concerning this ability referred to the pumping and spraying of concrete [3,4,7], but the fresh concrete exits the system as a particle stream, not an extrusion. Extruding concrete to build components has been mentioned in previous research [8][9][10][11] but a suitable test method to evaluate this ability of concrete has not been described.…”

Section: Extrudabilitymentioning

confidence: 99%

Mix design and fresh properties for high-performance printing concrete

et al. 2012

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This paper presents the experimental results concerning the mix design and fresh properties of a high-performance fibre-reinforced fine-aggregate concrete for printing concrete. This concrete has been designed to be extruded through a nozzle to build layer-by-layer structural components. The printing process is a novel digitally-controlled additive manufacturing method which can build architectural and structural components without formwork, unlike conventional concrete construction methods. The most critical fresh properties are shown to be extrudability and buildability, which have mutual relationships with workability and open time. These properties are significantly influenced by the mix proportions and the presence of superplasticiser, retarder, accelerator and polypropylene fibres. An optimum mix is identified and validated by the full-scale manufacture of a bench component.

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Section: Extrudabilitymentioning

confidence: 99%

Mix design and fresh properties for high-performance printing concrete

et al. 2012

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“…Various studies (Browne and Bamforth 1977;Ede 1957;Chailmo et al 1989;Tanigawa et al 1991;Alekseev 1952;Weber 1968;Morinaga 1973;Sakuta et al 1989;Jacobsen et al 2009;Kaplan et al 2005) have indicated that the lubrication layer which is formed at the interface between the concrete and the wall of the pipe plays a dominant role to facilitate concrete pumping (c.f. Fig.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Concrete Pumping Using Various Rheological Models

Choi

Kim

2014

Int J Concr Struct Mater

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When concrete is being transported through a pipe, the lubrication layer is formed at the interface between concrete and the pipe wall and is the major factor facilitating concrete pumping. A possible mechanism that illustrates to the formation of the layer is the shear-induced particle migration and determining the rheological parameters is a paramount factor to simulate the concrete flow in pipe. In this study, numerical simulations considering various rheological models in the shear-induced particle migration were conducted and compared with 170 m full-scale pumping tests. It was found that the multimodal viscosity model representing concrete as a three-phase suspension consisting of cement paste, sand and gravel can accurately simulate the lubrication layer. Moreover, considering the particle shape effects of concrete constituents with increased intrinsic viscosity can more exactly predict the pipe flow of pumped concrete.

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“…Most studies on the concrete pumping (Jo et al 2012;Choi et al 2013a;Alekseev 1953;Weber 1968;Morinaga 1973;Sakuta et al 1989;Jacobsen et al 2009;Kaplan et al 2005;Kwon et al 2013a, Kwon et al 2013b, Choi et al 2013b have indicated that the lubrication layer which is formed at the interface between the concrete and the wall of the pipe plays a crucial role in facilitating concrete pumping (Cf. Fig.…”

Section: Introductionmentioning

confidence: 99%

Numerical Prediction on the Effects of the Coarse Aggregate Size to the Pipe Flow of Pumped Concrete

Choi

2014

ACT

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The objective of this study is to numerically investigate the effects of coarse aggregate size on the pumpability of concrete. In actual construction of super-structures, the coarse aggregate size plays a determining factor on concrete pumping. Thus, depending on the coarse aggregate sizes, the properties of lubrication layer which is the major role facilitating concrete pumping, were numerically simulated using shear-induced particle migration analysis. Moreover, the particle shape effects according to the coarse aggregate sizes were also considered in numerical simulation to precisely simulate the actual flow conditions. For verification, 1,000m long full-scale tests with three different coarse aggregate sizes (10, 20 and 25mm) were conducted and compared with numerical results. It could be found that when concrete is being pumped, the rheological properties of concrete and lubrication layer highly depend on the coarse aggregate size, which consequently influences the flow condition of pumped concrete, whereas the thickness of lubrication layer remained almost constant irrespective of the coarse aggregate sizes.

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Flow conditions of fresh mortar and concrete in different pipes

Cited by 98 publications

References 4 publications

Mix design and fresh properties for high-performance printing concrete

Mix design and fresh properties for high-performance printing concrete

Prediction of Concrete Pumping Using Various Rheological Models

Numerical Prediction on the Effects of the Coarse Aggregate Size to the Pipe Flow of Pumped Concrete

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