Fresh Concrete Pumping Arrest Investigation for Thixotropy by Related Information

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Rheology of fresh cement pastes modified with nanoclay

Oct 13, 2021 · Abstract. Nanoclays (NC) can serve as thixotropy modifiers for fresh concretes, and show potential to meet the rheological demands of 3D concrete printing. Here, we propose a dry dispersion technique that produces NC-coated cement and compare to conventional methods of dispersion. Pastes incorporating NC were tested via shear rheology, scanning

Mert Yücel Yardimci | Research Portal

< Back to previous page Researcher Mert Yücel Yardimci Keywords: Construction and building technology Disciplines: Building engineering

Construction mishap kills man operating a concrete pump

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Manual of Water Well Construction Practices

Telescoping. A method of fitting or placing one casing inside another, or of introducing screen through a casing diameter larger than the diam- eter of the screen. Test Hole. Hole designed to obtain information on ground water quality and/or geological and hydrological conditions. Test Well. Well completed for pumping. Thixotropy.

Rheology - The Concrete Portal

Rheology measurements on concrete indicate that it is reasonable to approximate the concrete flow behaviour using a Bingham model1,2,9. The Bingham model, along with other common rheological models, are shown in Fig 1. Shear yield stress (y-axis intercept), τo, indirectly measures inter-particle friction, while the viscosity µ (slope of the

Thixotropic structural build-up of cement-based materials

Sep 01, 2021 · Thixotropy has a significant effect on the formwork pressure decay, inter-layer bonding of concrete casting or 3D printing, pumping re-initiation after (un)expected rest and many more [10,26,29]. Despite the importance of thixotropy on several aspects of fresh concrete simulation, only a handful of simulations did consider thixotropy.

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(PDF) CFD Implementation of Time-dependent Behaviour

Fresh Concrete Pumping Arrest Investigation for Thixotropy by a CFD Modelling Approach specifically focusing on the risk of thixotropy. Fresh concrete has been pumped in a horizontal closed

Rheology and processing of construction materials

Contents MaterialsScience and Design Influence ofWasteTire RubberonFresh and Hardened Properties ofSelf-Compacting Rubberized Concrete (SCRC) 3 RobertBusic andIvanaMilicevic Novel MixDesignMethodologyforSelf-Compacting Steel-Fiber Reinforced ConcreteBased onRheological and MechanicalConcepts 11 Angel dela Rosa, Elisa Poveda, Gonzalo Ruiz, andHector Cifuentes …

(PDF) Simulation of the flow of fresh cement suspensions

Simulation of the flow of fresh cement suspensions by a Lagrangian finite element approach. Download. Related Papers. A Lagrangian finite element method for non-Newtonian free-surface fluid flows and fluid-structure interaction problems. Computational modeling of concrete flow: General overview.

dr. Mert Yücel Yardimci - Universiteit Gent

Fresh concrete pumping arrest investigation for thixotropy by a CFD modelling apporach Robin De Schryver (UGent), , nano-fe3o4, structural build-up, thixotropy, concrete pumping, fly ash, fly-ash, performance, a-s-h, active rheology control

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Yield stress measurement of a thixotropic colloid

Jun 08, 2019 · Yield stress measurements have long been considered to be inconsistent and difficult, especially for a thixotropic colloid, since the thixotropic behavior gives rise to time-dependent rheological properties. In this paper, we attempted measuring the yield stress of aqueous xanthan gum (XG) solutions in different XG concentration. Our rheological measurements showed that XG in aqueous …

Enhancing thixotropy and structural build-up of alkali

Aug 02, 2021 · Especially in the 3D printing, for a given material, a small dynamic yield stress is required for the pumping stage while the higher static yield stress is preferred after the extrusion stage. A constant shear rate of 200 s −1 is subjected to the fresh pastes to evaluate the thixotropy according to previous studies [18, 32]. After mixing

Study on the Thixotropy of the Fresh Concrete Using DEM

Jan 01, 2015 · In general, the results reveal that the established thixotropy DEM model can be used to simulate the thixotropy and time- dependence of fresh concrete. 2 4 6 8 10 800 900 1000 1100 1200 1300 1400 1500 Experimental results Numerical results St at ic y ie ld st re ss /P a Time/min Linear fitting of B 2 4 6 8 10 320 340 360 380 400 420 440

Materials | Free Full-Text | 3D Concrete Printing: A

This paper provides a state-of-the-art report on the up-to-date research on the emerging 3D concrete printing technology from the concrete materials perspective. It reviews the recent research focused on understanding and characterizing the rheological necessities of the concrete printing process and discusses how the researchers are tailoring compatible mix proportions for the 3D concrete