Category

Post-Tensioning

Frequently asked post-tensioning questions are listed below, You may reach us through contact form for quotation and technical queries.

Benefits

General

Post-Tensioning

  • What is Post-Tensioning?

    Post tensioning is a innovative technique for reinforcing concrete. Post-tensioning tendons, which are prestressing steel cables inside plastic / GI ducts or sleeves, anchorages are positioned in the forms before the concrete is placed. Afterwards, once the concrete has gained strength but before the service loads are applied, the cables are pulled tight, or tensioned, and anchored against the outer edges of the concrete.

  • What is the difference between RCC and PT?

    RCC structural elements are reinforced to compensate the tensile requirements based on loading and building configuration the self weight of the structures are increased due to reinforcement and concrete weight. In Post-tensioning system tendons are profiled to compensate the tension and compression requirements and the external forces applied through stressing jack which is reduces plenty of steel and concrete.

  • What is the history of Prestressing?

    The present state of development in the field of prestressed concrete is due to the continuous research done by engineers and scientists in this field during the last 90 years. in 1886, Jackson of San Francisco applied for a patent for "construction of artificial stone and concrete pavements" in which prestress was introduced by tensioning the reinforcing the rod set in sleeves.

     

    The development of vibration techniques for the production of high strength concrete and the invention of the double-acting jack for stressing high-tensile steel wires are considered to be the most significant contributions made by Freyssinet between 1928 and 1933.

  • Is it safest system for structure?

    Refer to the history the continuous research and application over 90 years. post-tensioning structures stability is generally greater than RCC due to thin slab elements, reduced self weight, axial forces and post-tensioning hogging effect  provides better controls over the deflection of slab and beams.

Benefits

  • What is the Benefit of Post-tensioning?

    post-tensioning is comparatively cost effective, faster construction, high structural stability, control of structural cracks, reduced deflection, flat plate provides more floor to floor clearance, eliminate short span columns, eliminate additional beams, larger spans with thin slab, clear spaced car parks, reduces building self weight, reduced axial loads saves cost on  foundation and column elements.

  • What is the approximate savings in Post-Tensioning?

    The savings of post-tensioning elements slightly varies based on loading and building configuration. Post-tensioning utilization reduced concrete in the tension and compression zone in the range of 20 to 35%. The savings in steel are even higher, 60 to 80%, mainly due to the high permissible stresses allowed in the high-tensile wires. the decrease in structural weight reduces the design loads and the cost of foundations.

  • How to save cost on Foundation with PT?

    Post-tensioning raft foundation saves time on deep individual foundation excavation and tie beams installation and complicated reinforcement fixing process. avoid unexpected de-watering expenses. raft foundations are designed based on reduced PT slab self weight which is reduce the reinforcement and concrete requirements on foundation. eliminate foundation and ground floor concreting process and save time & cost.

  • What is the form work striking time for PT Slabs?

    Post-tensioning slab form work shall be removed immediately after completion of final stressing [Generally 3rd day after concreting].

     

    Back propping need to be provided as per structural engineer recommendation.

General

  • What is the Sequence of Post-Tensioning Work?

    [1] Form work decking [2] Bottom steel laying [3] Complete all slab edge shuttering [4] Fixing of PT anchors at edge shutters [5] Installation duct and tendons [6] Profile the tendons [7] Fixing of top bars and punching hooks [8] Pre-Pour Inspection [9] Pouring concrete [10] Remove edge shutters after 16 hours[11] Obtain 3rd day cube test report  [12] Fina Stressing [15] Grouting of slab after removal of back propping

  • What is the maximum design load for Post-Tensioning?

    The maximum design load for post-tensioning tendons is 80% of the ultimate tensile strength of the strand.

  • What is the compressive strength requirements for Final Stressing?

    The cube compressive strength is various between the codes but the general rage is 25 to 28 Mpa.

  • What are the structural application of Post-tensioning ?

    Car Park, High Rise Towers, Villa, Residential Building, Commercial Building, Girder Beams, Raft, Micro Piles, Ground Anchor, Air Ports, Public Buildings, Shopping Mall, Mosque, Industrial Building, Long Span Structures, Stadium, Township Developments, Precast, Prestressing, Silos and Bridges

CALL US NOW

 

Office: +973 17403535

Mobile: +973 33693377

COME VISIT US

 

Office 11, Building 883, Area 215,

Road 1523, Muharraq, Kingdom of Bahrain.

SEND US MESSAGE

 

General: info@ecospans.com

Sales: design@ecospans.com

Downloads

Our Services

Subscribe

Ecospan is innovative Post-tensioning and General Contracting Company.

 

Providing maximum support and savings to the customers is our prime business target.

Post-Tensioning

Structural Designing & Detailing

General Contracting

Subscribe and Stay with us for the latest update and offers

Value Engineering

Project Management

Submitting Form...

The server encountered an error.

Form received.

Inspection

Get latest updates and offers.

© 2018 Ecospan Construction - All Rights Reserved