Properties of Prestressing HT Strand

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In this post, we will learn about the Properties of Prestressing HT Strand.

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.

Properties of HT Strand (IS: 14268 – 1995)

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
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