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https://www.rocscience.com/documents/pdfs/rocnews/winter2012/Rock-Support-Interaction-Analysis-for-Tunnels-Hoek.pdf
application of an internal support pressure p i. This support can be provided by combinations of rockbolts, steel sets and shotcrete or concrete linings. The interaction of the deforming rock mass and the resisting support can be illustrated in the plot given in Figure 8.
http://bestsupportunderground.com/errores-aplicacion-shotcrete/?lang=en
As is the case in many aspects of life, a clean surface is vital to ensuring an optimal application of shotcrete, for two key reasons: for starters, it helps to eliminate residue, which will boost shotcrete’s capacity to adhere to the surface; and secondly, it removes any loose materials, so that the support work you’re doing is on a stable ...
https://en.wikipedia.org/wiki/Shotcrete
Shotcrete is an all-inclusive term for spraying concrete or mortar with either a dry or wet mix process. However, shotcrete may also sometimes be used (incorrectly) to distinguish wet-mix from the dry-mix method. The term shotcrete was first defined by the American Railway Engineers Association (AREA) in …
https://www.researchgate.net/publication/260857082_Designing_Shotcrete_As_Primary_Support_in_Tunnels
Since the advent of New Austrian Tunneling Method (NATM), shotcrete as primary means of support in tunnels has been widely applied. Its most important features are durability, speed of application ...
https://www.shotcrete.org/media/Archive/2011Sum_Sustainability.pdf
to support fresh concrete until it reaches a strength to be self-supporting. Fresh concrete in its liquid state before set exerts a substantial lateral pressure on the formwork trying to contain it. ACI 347, “Guide to Formwork for Concrete,” ... is little or no lateral pressure because the shotcrete is essentially
https://www.shotcrete.org/media/Archive/2003Win_Schallom.pdf
Shotcrete • Winter 2003 23 provided with excellent maintenance service and technical support include: Meyco (Switzerland) and Master Builders/Driftec systems (Canada). The Meyco Cobra and Road Runner are used in both civil tunnels and mining. The MBT/Driftec MSV 2000 is being used in the Canadian mining market. All these units are equipped ...
http://www.canusaequipment.com/wp-content/canusamedia/Articles/NozzlingTechniques.pdf
The air pressure in the hose for the dry-mix shotcrete process is no more than what is registering on the air gauge (80 to 100 psi [0.55 to 0.69 MPa]). The forces experienced by the nozzleman for the dry-mix process come from the ft3/minute of air, not the psi pressure in the hose. In the wet-mix process, we deal with working pressure from the ...
http://yoderlaserconcrete.com/concrete-vs-shotcrete-whats-the-difference/
The nuances and differences between concrete and shotcrete are too numerous to cover in a short article. Selecting a concrete placement method, whether it be conventional concrete, wet-mix or dry-mix process shotcrete, can be a challenging task, since there …
https://www.techgyd.com/shotcrete-concrete-pressure-cell/40352/
Apr 24, 2019 · ESC-30V is a NATM style shotcrete-concrete stress cell designed for measurement of radial and tangential stresses in shotcrete tunnel lining. The cell consists of a rectangular pressure pad constructed from two stainless steel plates welded around the periphery.
https://www.concrete.org/Portals/0/Files/PDF/Previews/506R_16_preview.pdf
Centrifugally applied concrete and low-pressure, low-velocity wet-process mortar and concrete are not considered shotcrete and not covered in this guide because they do not comply with the current definition of shotcrete; they do not achieve sufficient consolidation to be considered shotcrete (“Application and Use of Shotcrete” 1981).
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