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Thixotropy of SCC and Its Effects on Formwork Pressure

concrete rheology Pressure increases with slump (or slump flow) Concrete is at rest in forms; therefore, static yield stress is relevant Static yield stress is affected by dynamic yield stress and thixotropy SCC must be designed to flow under its own mass and exert low formwork pressure Low dynamic yield stress (self flow) Fast increase in static yield stress due to thixotropy (reduced ...

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Effect of powder materials on the rheology and formwork ...

The design of vertical formwork is governed by the lateral pressure exerted by fresh concrete; while maximum lateral pressure is the key parameter for formwork design, the rate of pressure decay ...

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Lateral Pressure on Concrete Formwork - IDH Design

16/08/2018  Calculation for the Lateral Pressure on Concrete Formwork While the aggregates and cement are suspended in water, the concrete exerts a fluid pressure on the formwork. The maximum pressure of that fluid at any position (in kN/m 2) is the height in metres multiplied by the density in kN/m 3 such that: P max = h * density

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Concrete Formwork Loads and Pressure Calculations - The ...

01/12/2016  Concrete formworks are subjected to various loads and pressure. Concrete formwork loads and pressure calculations are described in this article. Formworks or molds are considerably important for building constrictions by holding fresh concrete mixture at place until it get required strength by which the self weight can be sustained.

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FORMWORK PRESSURE AND RHEOLOGY OF SELF

FORMWORK PRESSURE AND RHEOLOGY OF SELF CONSOLIDATING CONCRETE BY KAVYA VALLURUPALLI THESIS Submitted in partial fulfillment of the requirements for the degree of Master of Science in Civil Engineering in the Graduate College of the University of Illinois at Urbana-Champaign, 2017 Urbana, Illinois Adviser: Professor David A Lange . ii ABSTRACT The objective of this work was

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Role of Rheology in Achieving Successful Concrete ...

01/06/2017  It will provide examples of how the basic fundamental principles of rheology can be applied to concrete technology to achieve suitable concrete performance as it pertains to segregation susceptibility, pumpability, surface finishability and formwork pressure. It will also provide a summary of test methods and equipment typically used to measure rheological properties.(use the following ...

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Thixotropy of SCC and Its Effects on Formwork Pressure

concrete rheology Pressure increases with slump (or slump flow) Concrete is at rest in forms; therefore, static yield stress is relevant Static yield stress is affected by dynamic yield stress and thixotropy SCC must be designed to flow under its own mass and exert low formwork pressure Low dynamic yield stress (self flow) Fast increase in static yield stress due to thixotropy (reduced ...

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[PDF] Formwork Pressure Measurements and Prediction of ...

Corpus ID: 139411355. Formwork Pressure Measurements and Prediction of High Performance Concrete with Adapted Rheology @inproceedings{Lange2018FormworkPM, title={Formwork Pressure Measurements and Prediction of High Performance Concrete with Adapted Rheology}, author={D. Lange}, year={2018} }

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Effect of powder materials on the rheology and formwork ...

Effect of powder materials on the rheology and formwork pressure of self-consolidating concrete. / Kim, Jae Hong; Noemi, Nagy; Shah, Surendra P. In: Cement and Concrete Composites, Vol. 34, No. 6, 07.2012, p. 746-753. Research output: Contribution to journal › Article › peer-review

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(PDF) Rheological behavior and formwork pressure of SCC ...

Introduction rate and method, ambient and concrete temperature, a maximum aggregate size, rheology of fresh concrete, setting time, formwork The rheological properties of fresh concrete significantly affect shape and admixtures used [3]. Great attention has been put in the construction operations such as transportation, placement, the study of SCC formwork pressure [4] because of the high ...

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Materials Free Full-Text Formwork Pressure of a ...

Apart from the density of concrete and the placement rate, the lateral pressure of an SCC mix on the formwork depends on several factors [13,14,15], including the height of the structural element, the rheological properties of the concrete, the time of starting the concrete strength increase [16,17,18,19], the methods and rate of mixing [16,17,18], the slope and stiffness of the formwork, and ...

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pdf Download Understanding the Rheology of Concrete ...

Finally, chapters in part three cover topics related to casting, such as thixotropy and formwork pressure. With its distinguished editor and expert team of contributors, Understanding the rheology of concrete is an essential reference for researchers, materials specifiers, architects and designers in any section of the construction industry that makes use of concrete, and will also benefit ...

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Numerical modelling of the filling of formworks with self ...

Keywords: CFD, numerical modelling, laminar flow, self-compacting concrete. 1 Rheology of SCC and the theory of formwork pressure 1.1 Rheology of SCC According to De Schutter et al [1], SCC can be defined as a concrete which needs to possess sufficient fluidity in order to be able to fill a formwork Advances in Fluid Mechanics VIII 157 WIT Transactions on Engineering Sciences, Vol 69, www ...

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Formwork pressure induced by highly flowable concretes ...

The design of vertical formwork is governed by the lateral pressure exerted by fresh concrete; while maximum lateral pressure is the key parameter for formwork design, the rate of pressure decay ...

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Role of Rheology in Achieving Successful Concrete ...

01/06/2017  It will provide examples of how the basic fundamental principles of rheology can be applied to concrete technology to achieve suitable concrete performance as it pertains to segregation susceptibility, pumpability, surface finishability and formwork pressure. It will also provide a summary of test methods and equipment typically used to measure rheological properties.(use the following ...

Get price

[PDF] Formwork Pressure Measurements and Prediction of ...

Corpus ID: 139411355. Formwork Pressure Measurements and Prediction of High Performance Concrete with Adapted Rheology @inproceedings{Lange2018FormworkPM, title={Formwork Pressure Measurements and Prediction of High Performance Concrete with Adapted Rheology}, author={D. Lange}, year={2018} }

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Effect of powder materials on the rheology and formwork ...

Effect of powder materials on the rheology and formwork pressure of self-consolidating concrete. / Kim, Jae Hong; Noemi, Nagy; Shah, Surendra P. In: Cement and Concrete Composites, Vol. 34, No. 6, 07.2012, p. 746-753. Research output: Contribution to journal › Article › peer-review

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Role of Rheology in Achieving Successful Concrete ...

Concrete rheology is introduced, and insights are provided into how rheology applies to mixture design and quality control, segregation, pumping, formwork pressure, and surface finish. Basic terminology is provided along with explanations of typical measuring instruments and testing procedures used to determine rheological properties. Original language : English: Pages (from-to) 43-51: Journal ...

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(PDF) Rheological behavior and formwork pressure of SCC ...

Introduction rate and method, ambient and concrete temperature, a maximum aggregate size, rheology of fresh concrete, setting time, formwork The rheological properties of fresh concrete significantly affect shape and admixtures used [3]. Great attention has been put in the construction operations such as transportation, placement, the study of SCC formwork pressure [4] because of the high ...

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Effect of Rheology-Regulation Additives on the Formwork ...

Effect of Rheology-Regulation Additives on the Formwork Lateral Pressure of the Self-Compacting Concrete ... This article mainly aims at to research the affect of thixotropy on the development of the formwork lateral pressure, the ultimate goal is to minimize the potential safety hazard of construction.Before the experiment, through the tests of net cement slurry, we can determine kaolin ...

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Numerical modelling of the filling of formworks with self ...

Keywords: CFD, numerical modelling, laminar flow, self-compacting concrete. 1 Rheology of SCC and the theory of formwork pressure 1.1 Rheology of SCC According to De Schutter et al [1], SCC can be defined as a concrete which needs to possess sufficient fluidity in order to be able to fill a formwork Advances in Fluid Mechanics VIII 157 WIT Transactions on Engineering Sciences, Vol 69, www ...

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STRUCTURE magazine Rheological Properties of Concrete

Reduce formwork pressure either by increasing yield stress or plastic viscosity. Summary. Single-point tests like the slump test measure empirically only the yield stress, which alone is not sufficient to evaluate the flow characteristics of concrete. Two-point tests measure both yield stress and plastic viscosity. It is difficult to measure the rheological parameters of concrete as the ...

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REDUCTION OF FORMWORK PRESSURES IN SELF-COMPACTING CONCRETE

the lateral formwork pressure is monitored. It was found that both additives, metakaolin and nanoclay, have a large potential to reduce lateral pressures by about 10-13% in the order of minutes after casting. Keywords: concrete, rheology, formwork pressure, metakaolin, nanoclay. INTRODUCTION In recent years, self-compacting concretes (SCC), characterized by high mixture flowability with no ...

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Understanding the Rheology of Concrete - Civil Engineering ...

25/04/2013  Understanding the Rheology of Concrete. By. Civilax - April 25, 2013. 7. Facebook. Twitter. WhatsApp. Linkedin . Viber. Estimating, modelling, controlling and monitoring the flow of concrete is a vital part of the construction process, as the properties of concrete before it has set can have a significant impact on performance. This book provides a detailed overview of the rheological

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