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rheology of high performance shotcrete rheology concrete

rheology of high performance shotcrete rheology concrete

Rheology of high performance shotcrete - UBC Library Open ...

The main goal of this study was to develop high performance shotcrete and to provide a fundamental understanding of the shooting process. For this, a laboratory concrete pump, to pump and/or shoot a number of shotcrete mixes, and a rheometer, to measure the rheological properties on the fresh shotcrete, were designed and constructed. A model based on rheological behavior was finally

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WHY IS RHEOLOGY IMPORTANT FOR SHOTCRETE AND HOW

5 Rheology of shotcrete Wet-mix shotcrete requires a complex and conflicting rheological performance to satisfy both pumpability and sprayability needs Pumpability • High flowability • High cohesion (to prevent segregation under pressure) Sprayability • Low flowability (to prevent sagging and increase build-up thickness) • Moderate plasticity (to aid with better dispersion of ...

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The rheology of fresh high-performance concrete ...

Feb 01, 1996  The rheological properties of fresh high-performance concrete were investigated with a new rheometer for concrete, BTRHEOM. It was found that, in a steady state, this category of concrete, without or under vibration, behaves as a Bingham material, and can be characterized by the shear yield stress (in Pa) and the plastic viscosity (in Pa.s).

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Rheology of High-Performance Concrete: Effect of Ultrafine ...

May 01, 1998  The effect of ultrafine particles used as partial replacements for cement on the rheology of high-strength concrete (HSC) was investigated. Various proportions of 3 μm and 0.7 μm mean particle size limestone fillers, a finely ground silica, and silica fume were individually used as partial replacement for cement in 0.33 water/binder (w/b) ratio concrete mixtures.

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Rheology of High Performance Shotcrete Rheology Concrete

RHEOLOGY OF HIGH PERFORMANCE SHOTCRETE. by DENIS BEAUPRI B.Sc., Universit Laval, 1986 M.Sc., Universit Laval, 1987 A THESIS SUBMI flED iN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY in THE FACULTY OF GRADUATE STUDIES (Department of Civil Engineering). We accept this thesis as conforming. THE

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The rheology of fresh high-performance concrete ...

The rheological properties of fresh high-performance concrete were investigated with a new rheometer for concrete, BTRHEOM. It was found that, in a steady state, this category of concrete, without or under vibration, behaves as a Bingham material, and can be characterized by the shear yield stress (in Pa) and the plastic viscosity (in Pa.s).

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Effects of admixtures on the rheological properties of ...

Mar 01, 2015  Beaupre studied the rheological properties of high-performance shotcrete using a self-developed UBC rheometer, in which pumpability and shootability of fresh shotcrete were evaluated. Another study [8] has confirmed that flow characteristics of fresh concrete largely depend on the rheological properties of cement paste matrices.

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A Study on Rheology Properties of High Performance Wet-mix ...

Beaupre, D. (1994) Rheology of High Performance Shotcrete PH.D Thesis, University of British Columbia. Beaupre, D. and Jolin, M. (2001) Effect of Shotcrete Consistency and Nozzleman Experience on Reinforcement Encasement American Shotcrete Association Magazine, Vol 3, No. 4, pp.20-23.

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Rheology Control of Ultra -high Performance Concrete

Oct 03, 2019  Rheology Control of Ultra -high Performance Concrete (UHPC) Jiang Du, Weina Meng* Advanced Concrete Technology (ACT) Lab . Department of Civil, Environmental and Ocean Engineering. Stevens Institute of Technology. Phone: (201)-216-8711. Email: [email protected]

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Rheological properties of ultra-high-performance concrete ...

Oct 01, 2019  1. Introduction. Ultra-high-performance concrete (UHPC) is a new class of cementitious composites that can develop superior mechanical properties and durability [, , , ].The compressive strength of UHPC is >120 MPa at 28 days under standard curing according to Perry [] and 150 MPa according to ACI 239 [].The tensile strength of UHPC ranges from 7 to 15 MPa [] with strain-hardening

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Rheology of high-performance concrete: Effect of ultrafine ...

The effect of ultrafine particles used as partial replacements for cement on the rheology of high-strength concrete (HSC) was investigated. Various proportions of 3 μm and 0.7 μm mean particle size limestone fillers, a finely ground silica, and silica fume were individually used as partial replacement for cement in 0.33 water/binder (w/b) ratio concrete mixtures.

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Rheology of high-performance concrete : effect of the ...

Rheology of concrete is of great importance to its flow performance, placement and consolidation. A full understanding of fresh concrete flow behavior can be achieved through a good understanding ...

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Measurement of the Rheological Properties of High ...

Jan 01, 1999  2.1 Fluid And Suspension Rheology. Concrete and mortar are composite materials, with aggregates, cement, and water as the main components. Concrete is really a concentrated suspension of solid particles (aggregates) in a viscous liquid (cement paste).

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Rheology of high flowing mortar and concrete SpringerLink

Rheology of high flow mortar and concrete was studied using coaxial cylinder rheometer and lifting sphere viscometer. The tests results were compared with the traditional test methods of high flowing mortar and concrete. Generalized equations for viscosity and yield stress of the mortar and concrete were then developed based on this investigation.

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(PDF) Rheology and bonding characteristics of self ...

This project aimed at comparing three different tech- [9] Beaupr~, D., 'Rheology of High-Performance Shotcrete', Ph.D. niques in order to achieve overhead repairs. These tech- Thesis, Department of Civil Engineering, University of British niques were: ordinary vibrated concrete, self-leveling Columbia, Vancouver, Canada (1994).

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UNDERSTANDING THE PUMPABILITY OF CONCRETE

The use of high strength wet-mix shotcrete in the underground world is more and ... characterization of the rheological and tribological properties of the fresh concrete since rheology is the science that studies the flow of matter and tribology is the ... mixtures such as low water/cement ratio high performance wet-mix shotcretes. There

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Effect of superabsorbent polymer characteristics on ...

Sep 01, 2020  1. Introduction. Ultra-high performance concrete (UHPC) is a new class of cementitious composites that can develop superior mechanical properties and durability owing to its ultra-low porosity and dense microstructure [, , ].However, because of its high content of cementitious materials, low water-to-binder ratio (w/b) and fine pore structure, UHPC can exhibit high risk of autogenous shrinkage

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Acti-Gel820 High Performance Rheology Modifier and Mix ...

8 High Performance Rheology Modifier and Mix Stabilizer Mining Gunite / Shotcrete Minerals INTERNATIONAL, LLC® Active Integrity. Innovation. Teamwork. Execution. Product Description Acti-Gel® 208 is a low-dose rheology modi˜er and anti-set-tling agent that stabilizes mixtures, provides superior aggregate suspension, and dramatically improves ...

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2. Concrete Rheology NIST

Nov 15, 2019  2. Concrete Rheology. This chapter describes modelling and experiments on the rheology of cement- based materials. The rheology of concrete is a difficult problem, as fluid cement paste is non-Newtonian by itself, and concrete has the added complication of many sand and rock inclusions. However, the processing of concrete is controlled by its ...

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Rheological behavior of high performance concrete with ...

The high volume Portland cement replaced ternary concrete can therefore be effectively characterized as a workable and pumpable concrete. Keywords: Rheology, PFA, GGBS, superplasticizer, concrete ...

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Rheology of High-Performance Concrete-Effect of ...

Jul 01, 2000  Title: Rheology of High-Performance Concrete-Effect of Superplasticizer and Silica Fume Author(s): R. Duval, E. H. Kadri, J. P. Bigas, and W. Luhowiak Publication: Symposium Paper Volume: 195 Issue: Appears on pages(s): 143-162 Keywords: admixture (water-reducing); concrete (high-performance); consistency; silica fume; superplasticizer Date: 7/1/2000 ...

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Acti-Gel820 High Performance Rheology Modifier and Mix ...

8 High Performance Rheology Modifier and Mix Stabilizer Mining Gunite / Shotcrete Minerals INTERNATIONAL, LLC® Active Integrity. Innovation. Teamwork. Execution. Product Description Acti-Gel® 208 is a low-dose rheology modi˜er and anti-set-tling agent that stabilizes mixtures, provides superior aggregate suspension, and dramatically improves ...

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(PDF) Relationship between Washout Resistance and ...

The Rheology of High-Performance Shotcrete Studies on Self-Compacting High Performance Concrete with High Volume Mineral Additives ... Jianxiong, C.; and Changhni, Y., "

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Measurement of the Rheological Properties of High ...

Jan 01, 1999  2.1 Fluid And Suspension Rheology. Concrete and mortar are composite materials, with aggregates, cement, and water as the main components. Concrete is really a concentrated suspension of solid particles (aggregates) in a viscous liquid (cement paste).

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The Benefits of Rheology Enhancing Admixtures on High ...

Jun 04, 2016  The Benefits of Rheology Enhancing Admixtures on High Performance Concrete Dr. Bruce J. Christensen Vice President, Global Technology Innovation Management BASF Construction Chemicals Division HKCI Annual Concrete Seminar Hong Kong 6 December 2017 v1

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UNDERSTANDING THE PUMPABILITY OF CONCRETE

The use of high strength wet-mix shotcrete in the underground world is more and ... characterization of the rheological and tribological properties of the fresh concrete since rheology is the science that studies the flow of matter and tribology is the ... mixtures such as low water/cement ratio high performance wet-mix shotcretes. There

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Multi Scale Experimental Study of Concrete Rheology: From ...

Mar 11, 2006  Beaupré, D (1994) Rheology of high performance shotcrete, phD thesis, University of Bristish Columbia. 22. Roussel N (2004) Three-dimensional numerical simulations of slump tests, Annual Transactions of the Nordic Rheology Conference, The Nordic Rheology

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Rheology and bonding characteristics of self-leveling ...

This paper presents the first part of a study under-taken to measure the potential of self-leveling concrete to perform overhead repairs. The performances of self-leveling concrete in terms of its filling ability and bonding characteristics was compared to dry-mixture shotcrete and to normal cast-in-place concrete. Self-leveling mixture characteristics included the presence of superplasticizer ...

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Measurement of the Rheological Properties of High ...

Oct 01, 1999  Predictions of the flow properties of concrete from its composition or from the properties of its components are not easy. No general model exists, although some attempts have been made. This paper gives an overview of the flow properties of a fluid or a suspension, followed by a critical review of the most commonly used concrete rheology tests.

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Influence of Glass Powder on Rheological Properties of ...

Replacing cement and silica fume with glass powder to prepare ultra-high performance concrete (UHPC) is beneficial to solve the ecological problem in the field of civil engineering, but the technologies of preparation, transportation, pumping, and hardening of UHPC mainly relate to its rheological property. Therefore, this paper studied the influence of glass powder on the rheological ...

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Fresh Concrete Rheology - Recent Developments NIST

Dec 01, 2001  Methods to predict the flow of concrete from either composition or laboratory tests and the main parameters that affect the flow of fresh concrete, such as composition, placement, and mixing methods, are discussed. Two special applications of rheology are also discussed: pumpable concrete and self-compacting concrete.

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Shotcrete Specifications – BoulderScape

Below is a list of shotcrete specifications that we get the most requests for from inspectors, General Contractors, and Engineers. For a complete set of ACI 506 shotcrete specifications visit concrete.The following ACI Shotcrete sections may be out of date. Please visits the ACI website for the most current Shotcrete specifications.

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Admixture System for Shotcrete Concrete Construction

Sep 14, 2016  The TYTRO Shotcrete System admixture solution makes shotcrete for underground construction better, faster and, less expensive than conventional systems. The TYTRO System includes a nanotechnology-based rheology control agent, patented macro synthetic fibers, and a number of other newly developed admixtures that enhance productivity of the ...

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