Properties of Prestressing HT Strand

A Steel member that is prestressed and embedded in concrete, loses the initially applied stress exponentially with the passage of time. The utmost important factor attributing to this loss in stress is the stress relaxation property of the steel itself. By treating the steel through a thermomechanical process known as stabilising, the propensity of the steel to relax under a stressed condition is controlled to a great extent. Some of the main advantages that our customers derive by using low relaxation strands are listed below :

• Up to 10% reduction in steel requirement is possible.

• Saving in a number of anchorages, ducts, sheathings, wedges and labour resulting in an overall reduction of the project cost.

• Reduction in concrete requirement due to the reduced size of structural members.

• Thermo-mechanical processing during the manufacture of LRPC Strands produces a nearly straight strand, thereby eliminating the necessity for an extra post straightening treatment.

Applications: Prestressed Concrete Girders for road, river & railway bridges & flyovers, prestressed concrete domes, buildings, silos, hangars, aqueducts, viaducts & railway sleepers.

• STACKING AND STORAGE OF MATERIALS
• Design and Construction Of Pile Foundations
• Evolution of Retaining Structures
• Glossary Relating To Bitumen And Tar
• Aluminium Formwork Refurbishment
• Safety For Hydraulic Tensioning Jacks
• Methodology of Post Tensioning Work
• Properties of Prestressing HT Strand
• Losses in Pre Stress due to Elastic Shortening
• Jack Pressure for Single and Multi Pull Stressing
• Elongation & Modified Elongation in Prestressing
• Prestressing Materials Management at Site
• Prestressing : Definitions | Advantage | Application
• Slipform – Slipform Planning at Site
• Labour Productivity Norms in Slipform
• Dismantling Procedure of Slipform
• Slipform Reinforcement Schedule Planning
• Assembly of Stair Tower for Slipform
• Assembling Procedure of Tapering Slipform
• Assembling Procedure of Straight Slipform
• Classification Of Slip Form Work
• Design Considerations of SlipForm
• Evolution of Slip Form Now a Days
• Measure Horizontal Distance Using AutoLevel
• Bulking OF Fine Aggregates
• Concrete Cube Samples Taken for Different Volume
• Grades of Concrete as per IS 456 : 2000
• Flowchart For Aluform Work At Site
• Dismantling Process of Aluminium Formwork
• Assembling Process of Aluminium Formwork
• Dismantling Of Slab Aluminium Formwork
• Dismantling Of Wall Column & Beam Formwork
• Aluminium Formwork Concreting Process
• Assembling of Wall Aluminium Formworks
• Assembly Process of Aluminium Formwork
• Aluminium Formwork Worksite Management
• What is 1.54 in Concrete
• De Shuttering Period as per IS 456
• Grade Of Concrete And Its Cement, Sand And Aggregate Ratio
• Derivation Of (d²/162) – Unit Weight Of Bar
• Volume Of Different Shapes

Class of HT Strand	Nominal Dia (mm)	Tolerance in Dia (mm)	Nominal Area (mm2)	Nominal Mass (Kg/M)	Breaking Strength (KN)	0.2 % Proof Load (KN)	Minimum Tensile Strength (N/mm2)	Modulus of Elasticity (N/mm2)
I	9.5	±0.4	51.6	0.405	89.0	80.1	1860	195000
	11.1	±0.4	69.7	0.548	120.1	108.1
	12.7	±0.4	92.9	0.73	160.1	144.1
	15.2	±0.4	139.4	1.094	240.2	216.2
II	9.5	+0.66 / -0.15	54.8	0.432	102.3	92.1	1860	195000
	11.1	+0.66 / -0.15	74.2	0.582	137.9	124.1
	12.7	+0.66 / -0.15	98.7	0.775	183.7	165.3
	15.2	+0.66 / -0.15	140	1.102	260.7	234.6