Unbonded Post-Tensioning System

PTSI provides Unbonded Post-Tensioning System which is a means of complementing the strength of the concrete in compression and overcoming its weakness in resisting tension. Post-Tensioning Systems apply compressive force to the structure through the stressing of high strength steel strand with specialized anchorage assemblies. The flexibility of the strand is a major advantage, allowing it to be profiled through the concrete element, counteracting a portion of the applied loads to provide an exceptionally efficient structure.

Choice of Post-Tensioning System

The choice of Post-Tensioning System usually involves trade-offs between structural and construction considerations. Typically the decision is governed by economic considerations. Virtually all American experience, both in the field and the laboratory, has been with unbonded tendons. Unbonded tendons offer unique structural advantages not observed in bonded tendons, and these advantages should be recognized and carefully considered in the decision between unbonded and bonded tendons. The important technical considerations are serviceability, strength, corrosion protection, redundancy and sustainability.

History

The history of pre-stressing technology is the history of the invention of tools and techniques, and is similar in many ways to the history of concrete construction. Experience and knowledge has enabled people to generate new ideas since its inception.

Pre-stressed Concrete

Pre-stressing simply means that the structural member is stressed internally before it is subjected to service loads. The Pre-stressing is done by applying an external force using a steel cable assembly, placed inside the structural member.

Application of Post-Tensioning System

Post-Tensioning is a highly efficient structural system that offers many benefits in a wide range of construction.

Evolution of Unbonded Post-Tensioning System

Durability has become an important issue in all types of construction as developer, engineers, and even the general public have become aware of the high cost of repairs and the potential property damage and life safety issues associated with deterioration of concrete and corrosion of the concrete reinforcing material.

Unbonded Post-Tensioning System

Unbonded Monostrand Post-Tensioning System is quick to install; tendons can easily circumvent the cutouts/openings as well as can cope with irregular slab shapes. The system has less friction losses, achieves more eccentricity and eliminates the vulnerable grouting process.

Technical Information

The Post-Tensioning system has gone through great evolutions over a period of time. Post-Tensioning Institute, ACI and Indian Standards have laid the specific requirements for the components of the system and keeps revising it.

Resources

I-sects (Voided Slab) System

In association with Daliform Group SRL, Italy, we present I-sects Forming System / U-Boot Beton® (a voided slab technology) that allows large spans, efficiently formed as flat plates without beams, for many types of buildings and other structures while using significantly less concrete than if solid. This is the most versatile voided slab system that allows builders to use less material and still maintain structural integrity.

The Concept

The concept is actually quite old. By using forming systems engineers have decreased the weight of floor slabs by creating voids through a variety of techniques for a very long time. But newer systems now make it possible to increase the efficiency of cast-in-place (CIP) concrete construction and reduce overall cost.

History

Take a tour through the timeline of I-sects Forming System (Voided slab)

Application

U-Boot Beton® is used in all applications that require a structural plate together with the need to use less concrete and therefore for a lighter structure.

Advantages

We are incorrectly led to estimate the advantage of a slab made lighter with U-Boot Beton® limiting it to a mere comparison between savings in concrete and the cost of the formwork on the level of the slabs only.

Characteristics of a U-Boot Beton® slab and comparison with a conventional solid slab

A factual comparison of void slab with solid slab with same depth is evident based on the criteria of flat plate configuration for various column grids.

Certifications

The quality of the used mixture, the innovative shape, the thicknesses and dimensions of the product, the fire safety and strict working techniques make it a product of excellence.

Resources

Maturity Sensing System

We present Maturity Sensing System specifically designed to give construction professionals the real-time information needed to safely and efficiently manage concrete-related workflow.

The Concept of Maturity Method

The maturity method is a technique to account for the combined effects of time and temperature on the strength development of concrete. The method provides a relatively simple approach for making reliable estimates of in-place strength during construction.

Advantages of Maturity Methods

  • Field implementation of the maturity concept and procedures is simple
  • Insures that strength of concrete meets specifications, if the procedure is followed correctly
  • Provides instant predictions of in-place strength

Limitations of Maturity Methods

  • Requires establishment of strength-maturity relationship in the laboratory prior to any field measurements

Maturity Sensing System

The system consists of a range of sensors and which measure and record physical properties of in-place concrete, a reader which is used to communicate with sensors and comprehensive software solutions to effectively analyze job-site information and communicate that information effectively. This innovative design allows a single reader to be used simultaneously with an unlimited number of sensors.

Resources