Advances in sprayed concrete (shotcrete) ScienceDirect

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Advances in sprayed concrete (shotcrete) - ScienceDirect

01/01/2019  The matrix in shotcrete is different from that in cast concrete and has its own distinct features. Typical mix designs are given in Table 12.1.Placement using pneumatic compaction and lack of forms in shotcrete requires that the material be more cohesive, adheres well to

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Shotcrete - an overview ScienceDirect Topics

Advances in sprayed concrete (shotcrete) N. Banthia, in Developments in the Formulation and Reinforcement of Concrete (Second Edition), 2019. Abstract. It has been often believed that shotcrete is just another concrete. However, research has demonstrated that when produced either by the dry-process or the wet-process, shotcrete is very different from concrete. Our conventional wisdom

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Gunite - an overview ScienceDirect Topics

29.11 Concrete without formwork Shotcrete (also known as sprayed concrete, or gunite) is a semidry mix that is sprayed onto a surface, and is consolidated onto it by the impact, and requires no formwork. The nozzle from which it is sprayed may be held by an operative or, on larger projects, such as tunnel linings, it is on a robot arm.

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Mechanisms of placement in sprayed concrete - ScienceDirect

01/09/2016  Sprayed concrete is a well established application method for concrete repairs and ground supports; its popularity ever increasing in the past decades. In this field, the development of new fundamental and practical knowledge relies heavily on understanding the placement process , which controls the amount of rebound loss and consequently the in-place material composition and properties.

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Estimation of the modulus of elasticity for sprayed concrete

28/02/2014  Sprayed concrete is a special type of concrete that combines the placement and the compacting of the material in only one process , thus ... Modern advances and applications of sprayed concrete. Shotcrete: Eng Dev (2001) Google Scholar. C. Goodier, S. Austin, P. Robins. Low volume wet-process sprayed concrete: hardened properties. Mater Struct, 41 (2008), pp. 99-111. View

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Rheology and rebound behaviour of dry-mix shotcrete ...

01/11/2001  The concrete must be as plastic as possible so that the sprayed aggregates can be embedded in the fresh concrete. On the other hand, the specific weight must not be greater than the cohesion of the shotcrete and the adhesive strength of the shotcrete to substrate interface in order to adhere to the surface. The following theoretical claims can be derived for the fresh, shotcrete mix,

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On the use of blast-furnace slag in sprayed concrete ...

Sprayed concrete containing slag reaches strength requirements of classes J 1 and J 2. • Accelerators activate slag and the matrix achieves a proper hydration behavior. • Slag does not influence hydration negatively after 3 h when accelerators are added. Abstract. Cement replacement by additions is crucial to produce sprayed concrete with proper mechanical properties and durability. The ...

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Advances in sprayed concrete (shotcrete)

Advances in sprayed concrete (shotcrete) It has been often believed that shotcrete is just another concrete. However, research has demonstrated that when produced either by the dry-process or the wet-process, shotcrete is very different from concrete. Our conventional wisdom developed through years of research in concrete, therefore, may not be applied verbatim to shotcrete. This paper ...

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Advances in sprayed concrete (shotcrete) Request PDF

Request PDF On Jan 1, 2019, N. Banthia published Advances in sprayed concrete (shotcrete) Find, read and cite all the research you need on ResearchGate. Chapter. Advances in sprayed concrete ...

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Advances in sprayed concrete (shotcrete)

Advances in sprayed concrete (shotcrete) It has been often believed that shotcrete is just another concrete. However, research has demonstrated that when produced either by the dry-process or the wet-process, shotcrete is very different from concrete. Our conventional wisdom developed through years of research in concrete, therefore, may not be applied verbatim to shotcrete. This paper ...

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Early Strength of Shotcrete for Tunnel Advances – New ...

06/08/2017  Sprayed concrete (or ‘shotcrete’) is often used as a lining for tunnels, particularly where the low mobilisation cost and flexibility of geometry make segmental tunnel linings uncompetitive. The early strength gain of the shotcrete is a crucial aspect to ensure there is effective ground support and to ensure the safety of operatives. Currently, strength monitoring is achieved by needle ...

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ASSPC - ADVANCED AND SUSTAINABLE SPRAYED CONCRETE ...

Start date: Jul 1, 2016 ASSPC - ADVANCED AND SUSTAINABLE SPRAYED CONCRETE The technical objective of the project is the development of highly durable shotcrete

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Advancements in shotcrete technology

Shotcrete, also termed as sprayed concrete, refers to a cement-based mixture that is proiected pneumatically at high velocity onto a target surface [1, 2]. The material component of shotcrete is essentially concrete or sometimes mortar, but the technology of shotcrete is unique. It involves pneumatic projection of the concrete

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Modern Advances and Applications of Sprayed Concrete

The term “Shotcrete” is used widely in the USA, and “Sprayed concrete” is more typically used in Europe, but gaining rapid acceptance in other e- r gions of the world. For the purposes of this paper, and in order to avoid confusion, the EFNARC European Specifica-tion for Sprayed Concrete define the expression “Sprayed Concrete” as a mixture of cement, aggre-gate and water projected ...

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Advanced Shotcrete Technology for Underground Engineering ...

Shotcrete, also known as sprayed concrete, is a special cement-based mixture designed to be projected pneumatically at a high velocity towards a target surface. In recent years, the development and application of underground space has made rapid progress, for example, in the subway, tunnel, and mining industries. Shotcrete is one of the important means for maintaining the stability and ...

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Shotcrete Gunite Sprayed Concrete Linings Fibo Intercon

Shotcrete and Gunite are names used in the world of sprayed concrete. Gunite was developed in 1895. and uses a dry mix concrete pumped to the nozzle with compressed air and water added at the nozzle. The concept was developed just after world war two. The system is a premixed wet concrete that is pumped to the spray nozzle by compressed air.

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Gunite Shotcrete Services

GSSL - Gunite and shotcrete services limited specialise in both wet spray and dry spray applications of sprayed concrete, together with refractory lining installation. In addition, GSSL provide project management services for this specialist field of civil engineering to larger companies, advice on feasibility, methodology, specification, together with the training and assessment for nozzleman ...

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Understanding Wet-Mix Shotcrete: Mix Design ...

the one that benefited most from recent advances . in the concrete admixture technology. Indeed, it is now possible to mix and pump concretes that will reach 60 MPa (8700 psi) compressive strengths thanks to the use of high-range water reducers and superplasticizers that allow mixtures to be designed with water/cementitious material ratios (w/cm) as low as 0.35. It is also now possible to ...

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Advances in sprayed concrete (shotcrete) Request PDF

Request PDF On Jan 1, 2019, N. Banthia published Advances in sprayed concrete (shotcrete) Find, read and cite all the research you need on ResearchGate. Chapter. Advances in sprayed concrete ...

Get price

ASSPC - ADVANCED AND SUSTAINABLE SPRAYED CONCRETE ...

Start date: Jul 1, 2016 ASSPC - ADVANCED AND SUSTAINABLE SPRAYED CONCRETE The technical objective of the project is the development of highly durable shotcrete

Get price

Advanced Shotcrete Technology for Underground Engineering ...

Shotcrete, also known as sprayed concrete, is a special cement-based mixture designed to be projected pneumatically at a high velocity towards a target surface. In recent years, the development and application of underground space has made rapid progress, for example, in the subway, tunnel, and mining industries. Shotcrete is one of the important means for maintaining the stability and ...

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Modern advances and applications of sprayed concrete ...

DOI link for Modern advances and applications of sprayed concrete. Modern advances and applications of sprayed concrete book. By T.A. Melbye, R.H. Dimmock. Book Shotcrete: Engineering Developments. Click here to navigate to parent product. Edition 1st Edition. First Published 2001. Imprint CRC Press. Pages 23. eBook ISBN 9781003078678. ABSTRACT ...

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Understanding Wet-Mix Shotcrete: Mix Design ...

the one that benefited most from recent advances . in the concrete admixture technology. Indeed, it is now possible to mix and pump concretes that will reach 60 MPa (8700 psi) compressive strengths thanks to the use of high-range water reducers and superplasticizers that allow mixtures to be designed with water/cementitious material ratios (w/cm) as low as 0.35. It is also now possible to ...

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SHOTCRETE: WET PROCESS VERSUS DRY PROCESS

spray characteristics. PROCESS SELECTION When selecting a method of placement, the finished product is rarely a determining factor. Other than a few small technical differences, the Fig. 1: Dry-mix shotcrete being installed on a retaining wall project. WWW.ICRI.ORG JULY/AUGUST 2015 CONCRETE REPAIR BULLETIN 21 material is all the same once it hits the substrate regardless of application

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Top PDF sprayed concrete or shotcrete - 1Library

In this paper, causes of deterioration of concrete as well as repairing by using cement grout, mortar, concrete, sprayed concrete or shotcrete, epoxy, ferrocement with mortar, Fiber Reinforced Polymer (FRP) Sprayed Fiber Reinforced Polymer (SFRP) and the techniques of applying of these materials and also some resin based materials for bonding agent between interface of old concrete and new ...

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Design of Sprayed Concrete Linings in Soft Ground─ A ...

11/03/2014  The use of Sprayed Concrete Lining is an established method of soft ground tunnelling using sprayed concrete to support the excavation both temporarily and permanently. Compared with other tunnelling methods, such as using a Tunnel Boring Machine (TBM), the biggest advantage of the SCL technique is it allows tunnels and junctions to be built at varying cross sections and sizes with

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Influence of Ground Temperature on Shotcrete-to-Rock ...

Similarly, Cui et al. discussed the influence law and mechanism of sprayed concrete and rock bonding performance under dry heat conditions and pointed out that compared with the standard curing condition of 20°C, the adhesion strength between shotcrete and rock under the condition of dry heat curing will be seriously reversed, and even the sprayed concrete and the rock will debond and crack.

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Sustainable shotcrete mix-designs for tunnels with longer ...

16/11/2020  One of the most important support measures in tunnel construction is the use of shotcrete, also known as sprayed concrete. In this application, concrete is applied via a nozzle and, depending on requirements, admixtures are added. Mix-designs for shotcrete have so far been based on experience and practical knowledge. The findings of the research project should now provide basic data for ...

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