Post-Tension Concrete

Description

Through our proven pre-construction services approach, project construction management systems, and design-build techniques, our teams is ideally suited to handle the complex projects of the institutional sector.
We know how to collaborate with public and private sector clients. We understand the value in identifying and working with the client, design teams, and project stakeholders early on to create value and an environment for project success.
Whether we are building an educational facility, campus buildings, or a state-of-the-art healthcare or research facility, we can customize our construction approach and methodology to suit any delivery schedule without compromising the quality of the project or safety.  

esolution construction & Engineering is uniquely prepared to take on the challenges and complexities of institutional construction projects including, but not limited to, medical facilities, educational institutions and correctional facilities. We understand this market’s need for spot-on coordination and we add value through our 3D BIM modeling capabilities. Utilizing this state-of-the-art technology, we are able to assist owners, engineers and construction managers with project coordination throughout the life of a project, from mechanical, electrical, and architectural design to structural steel design, fabrication and erection.

sustainable construction. We help clients optimize their building design criteria through a triple bottom line approach of people, planet and profit, for both planned new and existing facilities. We understand the balance between great design and constructability to successfully meet our clients’ current sustainability goals.

About Posttension Concrete

Post-tensioning applications could be applied to buildings designed for different usage such as residential , commercial and office buildings, parking, structures, slabs-on -ground, bridges, sports stadia, rock and soil anchors and watertanks. In many cases, post -tensioning allows construction that otherwise would be impossible in a traditional manner due to either site constraints or architectural requirements.

Post-tensioned concrete slabs have become a major factor on the construction of floor systems for commercial and residential buildings of all types. In their two most popular forms (one way slabs, two way flat plates) they have been found to be economical for structural applications in parking structures, apartment buildings, office buildings, hospitals and industrial buildings of both the high rise and low rise type.

One of the main reasons that led to the development of this technology is that post-tensioning can solve simultaneously weight, deflection and cracking problems, which arose with conventionally reinforced slabs.

Other major factor which contributed to the growth of post-tensioned slab construction included:

  • Improvements and simplifications in post-tensioning hardware and field methods, making post-tensioned slab construction as easy for the contractor as conventionally reinforced slabs. Improvements in forming systems, which enhanced the overall economics of cast-in place slab construction
  • Testing programs on post-tensioned slabs, which greatly expanded the understanding of their behavior, and led to improved code criteria and more economical, safe designs While more conventional reinforced is used, both for minimum crack distribution steel and for strength requirements, the combined use of per-stressed and non-per-stressed reinforcement results in considerable savings compared to the previous highly post-tensioned slabs.
  • The primary reason for the initial economy of post-tensioned industrial floors is the reduced thickness of the concrete slab, permitted because of the compressive stress induced in the concrete by the post-tensioning tendons. Additional reductions in costs are provided by elimination of most slab joints, reduced construction time and, in some cases, the elimination of pile supports or drilled shafts. For floors of prefabricated metal buildings, the post-tensioning also serves as a horizontal tie for the horizontal reaction from the building columns. This eliminates the need for conventional reinforcing bars in the slab to dissipate the column reaction into the slab, and at the same time eliminates the possibility of slab cracking associated with such details.
  • In addition to economic advantages, present day design criteria for post-tensioned slabs result in improvements in overall behavior (lower compression stresses and more bonded reinforcement reduce and distribute cracking caused by axial shortening restraints.
  • Such slabs generally have much less cracking than conventionally reinforced slabs. Design criteria and technology for post-tensioned slabs have been developed to a level comparable to that available for conventionally reinforced slabs. In detail, the advantages of the use of post-tensioned slab can be summarized as follows:
  • Control of Cracks - Post-tensioned slabs control cracks much better than other reinforced slabs, due to the squeezing pressure (tension) of the cables compressing the cracks.
  • Time Savings - Post -tensioned can be installed much faster that other reinforced foundation systems. A typical residential foundation takes 3-4 hours to install. Time is also saved by, using fewer joints, narrower footings, less digging, and easier to clean up in the event of inclement weather. Slab post-tensioning systems
  • Reinforcing Savings - As steel and concrete increase in pricing, the savings with a post- tensioned slab will increase, because the quantity of steel and concrete required for a post-tensioned slab is less than for a conventionally reinforced foundation. Clean out of the footings after a rain is much faster and neater than rebar type foundations.
  • Fewer Joints - Large concrete areas, such as tennis courts, parking lots, warehouses, metal buildings can have joint spacing increased to minimize cost of joints and long- term maintenance of the joints.
  • Deflection Control - Post-tensioning increases the slab stiffness and by its increased flexural and tensile capacities. For example in presence of expansive soils, it’s obviously that post-tensioned slab are more resistant. Infact, movement of soils can sometimes be significant enough to move the structure (slab on ground support foundation systems are still interactive with the soil).
  • Improved Modulus of Rupture - It is a fact that concrete shrinks when it dries and cracks. By utilizing a two part tensioning process, shrinkage cracking can be reduced.
  • Improved Flatness and Slab Levelness - With fewer joints and greater joint spacing, slab curling is greatly reduced.
  • Reduction in slab thickness - Minimum floor thickness maximises the ceiling zone available for horizontal services, minimises the self weight and foundation loads, and keeps down the overall height of the building.

Our institutional construction experience includes:

  • Government and public works (police stations, fire halls, offices)
  • Healthcare (hospitals, research laboratories, training facilities)
  • Education (K-12 and post-secondary institutions)
  • Military (Department of Defense, mission critical facilities)

Post-Tensioning Terminology

 

NEWS

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