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Prestressed Concrete Strand Testing - Isothermal Stress Relaxation Tester

Isothermal Stress Relaxation Tester

ASTM E328, ISO 15630-3

Isothermal Stress Relaxation Tester TT-PCSSR400-PCStrand

Torontech’s TT-PCSSR400-PCStrand is used to determine stress-relaxation of metal, such as concrete strand, prestressed concrete bar, and steel rope. Specimen is deformed at a given amount, decrease in stress is recorded over a prolonged period of exposure at constant elevated temperature.

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Torontech’s TT-PCSSR400-PCStrand the Standard Test Methods for Stress Relaxation Tests for Materials and Structure as per ASTM E328, as well as the Standard Test Method of Testing Prestressed Steel (Isothermal Stress Relaxation) as per ISO 15630-3.

Real time display Load versus Time, Temperature versus Time and Relaxation rate versus Time curves. Automatically calculation of 1000 hours tensile stress relaxation rate. High precision temperature recorder attached to record the influence of room temperature variations. Servo-controlled drive system ensures high precision load/displacement/strain close-loop control, as well as low noise. User configurable test methods and customizable report templates. Self-alignment design on specimen anchoring to ensure high accuracy. Patent calibration system mounted on machine to calibrate the load cell as well as the whole machine without disassembly the load cell from machine.

ASTM E328, ISO 15630-3
400 kN
Measuring range
16-400 kN
Load resolution
Load accuracy
Load measuring accuracy
±0.1% of reading to 1/100 of load weighing system capacity meets or exceeds the requirements of the following standards: ISO 7500-1, EN 10002-2, ASTM E4, JIS B7721
Creep of load cell
30 minutes <= 0.02%
Position accuracy
Horizontal span
1850 mm
Ball Screw stroke
100 mms
Loading speed
100 – 5000 N/S
Speed accuracy
Set speed<0.05% - Max. Speed: ±1%, Set speed ≥0.05% - Max. speed:±0.5%
Temperature accuracy
Temperature sensor resolution:0.1℃ Temperature sensor accuracy:±0.3℃
Position measurement accuracy
±0.01 of reading or 0.0001 mm, whichever is greater
Specimen Dimensions
PC Strand (mm)
PC Wire (mm)
PC Bar (mm)
Power supply
Please specify voltage and frequency before placing the order. Standard optional voltages 3ph, 220/380VAC, 50-60 Hz, Power must be free of spikes and surges exceeding 10% of the nominal voltage.
Operating temperature
0 to +38°C (+32 to +100°F)
Humidity range
10% to 90% non-condensing
Storage temperature
-40 to +66°C (-40 to +150°F)
Machine Dimension L x W x H
1950 mm x 540 mm x 1015 mm
1400 kg
Quote Form
Please Contact us for pricing, check availability, or ask for additional information about our Isothermal Stress Relaxation Tester
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