Tensar's BX1200 Geogrid & Spectra Roadway Improvement System teamed up in Indiana to create a stable and weather- resistant lay-down area at Hoosier Energy's Frank E. Ratts Generating Station.
this slides is about the technologies like using HPC, SCC, high performance steel, prefabricated deck panels, spot welding system,GSSI bridge scan system used in construction of bridges
Shortcreting has proved to be the best method for construction of curved surfaces. Domes are now much easier to construct with the advent of shotcrete technology. Tunnel linings are also becoming easy with this technology. Not only are these but there a wide range of applications where this technology has been a leading one. This technical paper includes the concept of shotcrete and how it differs from conventional concrete. It also enumerates the different types of process involved in shotcreting i.e. dry mix process and wet mix process. Advantages of shotcrete and its applications in various fields like tunneling, canals, buildings etc. are specified in detail. This paper presents an overview of shotcreting technology along with its applications.
DEFINITION OF SHOTCRETE:-
Shotcrete is a mortar or high performance concrete conveyed through a hose and pneumatically projected at high velocity onto a backing surface. It is the force of this spraying action that leads to compaction of the concrete or mortar which then forms layers of concrete to the required thickness. Shotcreting has been an acceptable way of placing cementitious material in a variety of applications.
Usually patented polypropylene fibers are included in the shotcrete which increases the cohesive nature of the shotcrete through mechanically binding the cementitious materials together. This mechanism reduces the rebound waste that occurs through the shotcreting process and these fibers also resist plastic shrinkage and cracking through their ability to enhance the early stage tensile strength of concrete.
Shotcrete also gives better surface finishes and reduces surface tearing on non- linear sections. Cementitious material containing the poly propylene fibers resist cycles of freezing and thawing and also reduces the chances of water and chemical penetrations.
Tensar's BX1200 Geogrid & Spectra Roadway Improvement System teamed up in Indiana to create a stable and weather- resistant lay-down area at Hoosier Energy's Frank E. Ratts Generating Station.
this slides is about the technologies like using HPC, SCC, high performance steel, prefabricated deck panels, spot welding system,GSSI bridge scan system used in construction of bridges
Shortcreting has proved to be the best method for construction of curved surfaces. Domes are now much easier to construct with the advent of shotcrete technology. Tunnel linings are also becoming easy with this technology. Not only are these but there a wide range of applications where this technology has been a leading one. This technical paper includes the concept of shotcrete and how it differs from conventional concrete. It also enumerates the different types of process involved in shotcreting i.e. dry mix process and wet mix process. Advantages of shotcrete and its applications in various fields like tunneling, canals, buildings etc. are specified in detail. This paper presents an overview of shotcreting technology along with its applications.
DEFINITION OF SHOTCRETE:-
Shotcrete is a mortar or high performance concrete conveyed through a hose and pneumatically projected at high velocity onto a backing surface. It is the force of this spraying action that leads to compaction of the concrete or mortar which then forms layers of concrete to the required thickness. Shotcreting has been an acceptable way of placing cementitious material in a variety of applications.
Usually patented polypropylene fibers are included in the shotcrete which increases the cohesive nature of the shotcrete through mechanically binding the cementitious materials together. This mechanism reduces the rebound waste that occurs through the shotcreting process and these fibers also resist plastic shrinkage and cracking through their ability to enhance the early stage tensile strength of concrete.
Shotcrete also gives better surface finishes and reduces surface tearing on non- linear sections. Cementitious material containing the poly propylene fibers resist cycles of freezing and thawing and also reduces the chances of water and chemical penetrations.
El sistema Spectra de Tensar entrega a los constructores una forma innovadora de reducir los costos, tanto de agregados, como de asfalto; además, aumenta el valor y resistencia del producto final en la construcción de una carretera. Emin Sistemas Geotecnicos.
1. “
USING POST -TENSIONING HAD
MASSIVE ENVIRONMENTAL
BENEFITS OVERTRADITIONAL
REINFORCED CONCRETE AND
STEEL STRUCTURES,WHICH
WAS IMPORTANT FOR SUCH A
LARGE PROJECT.”
The construction phase went smoothly, even
though there were areas of complexity
demanding a close interface between the
post-tensioning designers and the services
ST DAVID’S CENTRE CAR PARK, CARDIFF, UK engineer who required multiple penetrations
through the post-tensioned beams. Clear and
detailed communication was maintained with
Greener parking the contractor throughout the project, from
design to completion on site.
The quick erection of the formwork system,
in conjunction with the efficient pour
ichard Gaskill of Structural Systems – the BBR Network
R member in the UK – explains that significantly more
additional parking was required to service the St David’s 2
development in Cardiff which led to the construction of a five
sequence offered by the Structural Systems
team, enabled the contractor to complete
the frame in 27 weeks.
Using post-tensioning had massive
level, multi storey car park, totaling in excess of 50,000 m². This environmental benefits over traditional
gives the new centre a total of 3,000 parking spaces and the reinforced concrete and steel structures,
which was important for such a large
drama of the development is heightened by the particularly
project.The use of post-tensioning reduced
striking elliptical ramp access to the car park. slab depths significantly so that, overall, less
As part of the regeneration of Cardiff city deck slabs and a BBR CONA flat 0605 concrete and substantially less rebar was
centre, the new St David’s 2 scheme system for the 525 mm x 16 m span beams. used – which was extremely beneficial to the
represents a £675 million investment, totaling The car park sits on a transfer slab at level client in terms of program and budget. G
89,891 m² of retail-led mixed-use three and is tied to a stair core in the centre
development, with over 100 stores and 300 of the building. By introducing post-tensioning TEAM & TECHNOLOGY
luxury roof top apartments, built as seven techniques, the slab depth for the car park OWNER St David’s Partnership
towers above the shopping centre. was reduced to typically 150 mm – MAIN CONTRACTOR Skanska Construction
The size of the floor plate meant that each permissibly the thinnest depth for a car park CONCRETE FRAME CONTRACTOR
level was typically constructed as seven slab – with some areas at 175 mm and P.C. Harrington Contractors Limited
pours.The frame contractor elected to utilize nominally 300 mm thick.The beam tendons DESIGNER Arup / Structural Systems (UK) Ltd
a slab and beam configuration. Structural were mainly 36 m long, although in some TECHNOLOGY BBR CONA flat
Systems supplied the BBR CONA flat 0305 instances 56 m long double end stressed BBR NETWORK MEMBER
Structural Systems (UK) Ltd
post-tensioning system for the reinforced tendons were used.
42 CONNÆCT