Insights in thixotropic concrete pumping by a | Talenet

Basics of thixotropy :: Anton Paar Wiki

Thixotropy tests give an insight into the sample's time-dependent flow behavior and can thereby be employed for quality control of various products. According to modern standards such as DIN spec 91143-2 and ISO/WD 3219-1 thixotropy is characterized by decreasing viscosity over time when a shear rate is applied and full structural

L-Box Form Filling of Thixotropic Cementitious Paste and

Concrete is a non-Newtonian material with yield stress and viscosity ranging from shear-thinning to shear-thickening due to its mixture and design, e.g., its relative solid volume fraction and the chemistry of the cementitious phase [1,2,3,4].Knowledge about fresh concrete flow is essential for casting, placement, and setting processes which affect the strength and durability performance of

Investigating the Thixotropic Behaviour of Tremie Concrete

This paper presents a new thixotropic model integrating the Papanastasiou-Bingham model with thixotropy equations to simulate the flow behaviour of Tremie Concrete in the Material Point Method framework. This study investigates the effect of thixotropy on the rheological behaviour of fresh concrete by comparing field measurements with numerical simulations. The comparison yields new insights

Thixotropic effects during large-scale concrete pump tests

During recent years, the fundamentals of pumping fresh concrete have been intensively studied worldwide. New insights have been gained concerning the important role of the lubrication layer near the surface pipe. The influence of rheological properties of the fresh concrete, like yield stress, viscosity, and shear thickening behavior, is now well understood, and can be fairly accurately modelled.

Rheological parameters, thixotropy and creep of 3D-printed

Apr 01, 2020 · The 3D-printed CSA cement paste was continuously extruded by a screw mixing under a constant air pump pressure of 0.3 MPa, loading speed of 15 mm/s, and feed rate of 10 mm/s. In addition, the distance from the nozzle to the printed layers was set to 2.4 mm, which was lower than the diameter of the nozzle, to eliminate interface defects.

(PDF) Pumping of Fresh Concrete: Insights and Challenges

Pumping pressure is well predicted based on Kaplan's model [14], based on tribology and rheology measurements on different types of concrete. Figure modified from [24].

Thixotropic Joint Filler by Parex

Thixotropic Joint Filler. by Parex. ‹ › ×. Description. A pumped mortar purpose-designed for filling joints and gaps in precast concrete units without the need for formwork. The thixotropic qualities of the mortar and non-shrink additives allow it to stay in place without slumping and to provide a complete high strength bond between sections.

Key Engineering Materials Vols. 405-406 | p. 2

Abstract: Reactive powder concrete (RPC) is a new kind of material with very high mechanical behavior and durability, however, high cost and complex procedure to make RPC result in hardly apply to engineering in large scale. a new low-cost RPC that compressive strength exceeds 130MPa was prepared with the replacement of quartz sand, crushed quartz and partial of silica fume by fly ash, slag

Robin DE SCHRYVER | MScEng | Ghent University, Gent

Insights in thixotropic concrete pumping by a Poiseuille flow extension. Article. Full-text available. (ASC) of fresh concrete. Concrete pumping control is a major potential application of

(PDF) Insights in thixotropic concrete pumping by a

Insights in thixotropic concrete pumping by a Poiseuille flow extension | 83 advectiv e time scale, although it is usually de ned for non- yield stress uids by the viscosity and a velocity propor -

Rheological parameters, thixotropy and creep of 3D-printed

Apr 01, 2020 · The 3D-printed CSA cement paste was continuously extruded by a screw mixing under a constant air pump pressure of 0.3 MPa, loading speed of 15 mm/s, and feed rate of 10 mm/s. In addition, the distance from the nozzle to the printed layers was set to 2.4 mm, which was lower than the diameter of the nozzle, to eliminate interface defects.

L-Box Form Filling of Thixotropic Cementitious Paste and

Concrete is a non-Newtonian material with yield stress and viscosity ranging from shear-thinning to shear-thickening due to its mixture and design, e.g., its relative solid volume fraction and the chemistry of the cementitious phase [1,2,3,4].Knowledge about fresh concrete flow is essential for casting, placement, and setting processes which affect the strength and durability performance of

Analysis of the complex rheological properties of highly

Insights in thixotropic concrete pumping by a Poiseuille flow extension. Rheology of polysulfone-N-methylpyrrolidone solutions used in the technology of lithium-ion batteries. Rheological behavior of a bentonite mud. Correlating Coating Quality of Coverage with Rheology for Mica-Based Paints. See more

Insights in thixotropic concrete pumping by a Poiseuille

Insights in thixotropic concrete pumping by a Poiseuille flow extension De Schryver Robin, De Schutter Geert; Affiliations De Schryver Robin Magnel-Vandepitte Laboratory, Department of Structural Engineering and Building Materials, Faculty of Engineering and Architecture, Ghent University, Technologiepark-Zwijnaarde 60, B-9052 Ghent, East

Medium strength (40 N/mm ), fibre reinforced, thixotropic

abrasion: use Mapegrout Thixotropic or Mapegrout T60 instead. • Do not use Mapegrout T40 when the material has to be pumped over long distances or in the case of large pumping heads (use Mapegrout Easy Flow). • Do not use Mapegrout T40 on smooth concrete surfaces. Roughen the surface thoroughly and add reinforcing if necessary.

Research Explorer - Publications of Geert De Schutter

Insights in thixotropic concrete pumping by a Poiseuille flow extension. Robin De Schryver Geert De Schutter. A1 Journal Article in APPLIED RHEOLOGY. 2020. Investigation on influential factors on chloride concentration index of cement-based materials by pore solution expression method.

The influence of sulfate availability on rheology of fresh

Insights in thixotropic concrete pumping by a Poiseuille flow extension. Rheology of polysulfone-N-methylpyrrolidone solutions used in the technology of lithium-ion batteries. Rheological behavior of a bentonite mud. Correlating Coating Quality of Coverage with Rheology for Mica-Based Paints. See more

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Distinct-layer casting of SCC: The mechanical consequences

For example, lower thixotropic structural build-up is needed to overcome the major problem in resuming pumping operations if a short interruption is experienced (such as the delay of concrete

Numerical simulation of fresh concrete flow: insight and

size) [32]. The air trapped in concrete is the next, gaseous phase to be modelled. During the flow, non‐Newtonian effects such as yield stress, shear‐thickening and thixotropic behaviour occur [15]. Caused by the migration of solid particles, effects such as segregation and blocking can occur.

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