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Asphalt pavement materials dynamic fatigue testing machine

Asphalt pavement materials dynamic fatigue testing machine

Model: HDS-50; EN 12697-24, 25, 26; ASTM D4123, ASTM D7396, ASTM D3497

Asphalt pavement materials dynamic fatigue testing machine is mainly used for uniaxial testing and research of asphalt mixtures. It is used to determine the dynamic modulus of asphalt mixtures, asphalt static and dynamic creep, uniaxial penetration strength tests, indirect tensile (splitting) fatigue tests, four-point beam bending fatigue, and more. It measures physical properties such as rebound modulus, Poisson’s ratio, indirect tensile creep and strength, dynamic modulus, tensile strength, phase angle, and bending fatigue. Further applications include asphalt triaxial testing, soil rebound modulus, dynamic pavement design, liquefaction phenomena, and conventional testing. Testing standards include EN 12697-24, 25, 26 and ASTM D4123, ASTM D7396, ASTM D3497, among others.

During the use of the pavement, under the influence of temperature and repeated wheel loads, it is continuously subjected to alternating stress and strain. This gradually reduces the structural strength of the pavement. When the repeated loads exceed a certain number, the stress generated inside the pavement under loading will surpass the structural resistance after strength reduction, causing cracks and fatigue failure. The number of stress cycles the asphalt pavement experiences before fatigue failure is known as its fatigue life.

Asphalt pavement materials dynamic fatigue testing machine is mainly used for uniaxial testing and research of asphalt mixtures. It is used to determine the dynamic modulus of asphalt mixtures, asphalt static and dynamic creep, uniaxial penetration strength tests, indirect tensile (splitting) fatigue tests, four-point beam bending fatigue, and more. It measures physical properties such as rebound modulus, Poisson’s ratio, indirect tensile creep and strength, dynamic modulus, tensile strength, phase angle, and bending fatigue. Further applications include asphalt triaxial testing, soil rebound modulus, dynamic pavement design, liquefaction phenomena, and conventional testing. Testing standards include EN 12697-24, 25, 26 and ASTM D4123, ASTM D7396, ASTM D3497, among others.

During the use of the pavement, under the influence of temperature and repeated wheel loads, it is continuously subjected to alternating stress and strain. This gradually reduces the structural strength of the pavement. When the repeated loads exceed a certain number, the stress generated inside the pavement under loading will surpass the structural resistance after strength reduction, causing cracks and fatigue failure. The number of stress cycles the asphalt pavement experiences before fatigue failure is known as its fatigue life.

Asphalt pavement materials dynamic fatigue testing machine

This model of electro-hydraulic servo static and fatigue testing machine is mainly used to test the static and dynamic mechanical properties of various metal materials, composite materials, rubber and plastic materials and components, and finished products. It can realize static tests such as tensile, compression, bending, torsion, etc., and can also realize high cycle fatigue, low cycle fatigue, crack propagation, fracture mechanics and other tests. Various waveform loading such as sine wave, triangle wave, square wave, and trapezoidal wave can be performed. The configuration of high temperature furnace, high and low temperature chamber and corrosion box can realize mechanical property testing in different environments. Widely used in universities, research institutes, aerospace, ships, nuclear power, automobiles and other fields of research and testing.


Key Features

  • Standard
  • Test type
  • Host frame structure
  • Oil source system
  • Optional cooling system:
  • Measuring and control system

EN 12697-24 Bituminous mixtures. Test methods Resistance to fatigue

EN 12697-25 Bituminous mixtures - Test methods - Part 25: Cyclic compression test

EN 12697-26 Bituminous mixtures. Test methods Stiffness

 

Asphalt

AASHTO TP62, ASTM D4123, BS DD 226, EN 12697 26

BS DD 213, EN 12697 24, ASTM D3497, AASHTO TP31, EN 12697 25, AASHTO TP8, ASTM D7396

 

Unbound materials

ASTM D3999, AASHTO P46, ASTM D5311, AASHTO T307

 

Chinese tests

Asphalt bending, Asphalt creep, Asphalt splitting test up to 25kN

 

SPT tests

Dynamic modulus Flow number Dynamic modulus for fatigue cracking

Modulus
● EN 12697-26 Appendix C
● ASTM D4123
● AASHTO TP31
● AASHTO TP62
● ASTM D7396

Fatigue
● EN 12697-24 Appendix E
● DCT
● SCB

ZG Test Methods
● Bending; Creep; Splitting Test

Permanent Deformation
● EN 12697-25 Method A & B

Simple Performance Tests
● Dynamic Modulus; Flow Number
● NCHRP9-19; NCHRP9-29

Unbound Materials
● AASHTO T307 (formerly TP46)
● NCHRP 1-28A

The main frame is mainly composed of base, test bench, column, beam, locking cylinder, etc., and the test bench and beam are connected into a rigid frame by two columns to form a test space. The connection between the column and the test bench is locked by a nut, and the beam is pushed by a lifting cylinder, which can be moved up and down the column to adjust the test space. After adjusting the test space, the beam is locked to the column by means of a locking cylinder.

(1) Column spacing: 460mm;

(2) Vertical working space: 880mm;

(3) Effective height of the table: 350mm;

(4) Frame stiffness: 4.73×108N/m;

(5) Dimensions: 620mm×628mm×1612mm;

(6) Total weight: about 430kg; 


1.2, Load cell 

(1) Adopt USA Celtron 25KN load cell, overload capacity 150%. placed on the upper beam with self-locking nut;

(2) Displacement sensor: 150mm (±75mm), built-in actuator;


1.3, Actuator

(1) Maximum dynamic test force: ±25KN;

(2) Effective stroke of actuator: 150mm;

(3) Double rod piston structure. Sealing method: guide ring + servo sealing ring (all components imported).

(4) The actuator has a built-in LVDT displacement sensor and an external electro-hydraulic servo valve.

(5) Design the hydraulic buffer zone at the amplitude limit position of the actuator to avoid damage caused by runaway operation;

(6) The use of pilot operated end cover design ensures that the damage of the piston movement to the seal is smaller, so that the life of the seal is longer and the coaxially is better guaranteed;


1.4, Operation Panel

(1) Simple and convenient operation, beautiful appearance, fully in line with the principle of ergonomics;

(2) The pressure of the hydraulic fixture can be visually displayed by the upper and lower fixture pressure gauges;

(3) The pressure of the hydraulic fixture can be adjusted by the pressure adjustment knob;

(4) The flow rate of the hydraulic fixture can be adjusted by the flow adjustment knob;

(5) The hand control box can control the actuator up and down and stop.

The oil source system is mainly composed of oil tank body, pump unit, valve block assembly, control box, etc., the pressure output has high/low pressure, using remote control, high and low pressure switching. High pressure is used during the test, and low pressure is used when the test is not done, so as to save energy, reduce heat generation and reduce noise.

2.1, Pumping station frame

It adopts sheet metal welding, closed box, the base and the oil tank body are integrated, and the three sides can be removed, which is easy to maintain, beautiful appearance and convenient operation.

2.2, Control valve block assembly

(1) Provide instantaneous peak flow for servo actuator, absorb pressure pulsation response speed quickly;

(2) Independent pressure regulation and fast unloading capacity, pressure regulation and unloading do not affect the normal operation of other channels;

(3) Improve the impact resistance of the hydraulic system;

(4) High-precision oil filter to improve oil cleanliness;

2.3, Performance characteristics and technical parameters

(1) Total flow 20L/min, pressure 21Mpa;

(2) Total power 7.5kW, 380V, AC;

(3) The pump station is manufactured according to the standard modular design, with mature technology and stable performance; Configured relay regulator module, connected to actuator;

(4) The oil pump adopts the internal meshing gear pump of Japan NACHI company, which adopts involute internal meshing gear meshing transmission, low noise, excellent durability and long life;

(5) The oil pump motor unit is equipped with a vibration damping device (choose a vibration damping pad) to reduce vibration and noise;

(6) The high and low pressure switching valve group is used for the start and stop of the hydraulic system (servo controller remote control);

(7) Fully enclosed standard servo fuel tank. With temperature measurement, air filtration device, oil level display and other functions;

(8) The system configuration brazed plate cooler is installed on the system return pipeline;


The cooling system adopts brazed plate cooler, and the industrial water cooler circulation system is used, the cooling efficiency is high, the effect is good, and the main technical parameters are as follows:

(1) Dimensions: 1250mm×560mm×1200mm

(2) Chilled water flow: 55L/min 

(3) Total input power: 13.5KW

(4) Safety protection: compressor overheating protection, overcurrent protection, high and low pressure protection, overtemperature protection, flow protection, phase sequence/phase loss protection, exhaust overheating protection

(5) Features: easy to operate, beautiful appearance, low noise

(6) Weight: 460Kg

Fully digital controller with PIDF regulation.

– The load signal can be elicited

-Control mode: force, displacement, deformation closed-loop control, and amplitude compensation function.

-Optional: force, displacement, deformation output interface.

- Dynamic closed-loop control frequency (refresh rate): 5kHz.

-Signal generator frequency range: 0~1kHz.

-Control waveform: sine wave, triangle wave, square wave, oblique wave, combined waveform and point connection waveform, etc., and external signal input is possible.

-Advanced fully digital signal processing technology, system resolution of 19/24 bits, eliminating manual conversion of ranges within the full-scale range.

-The measurement signal of the sensor has a variety of filters in the range of 100Hz to 1000Hz, providing high accuracy, low drift, and low noise performance.

-The protection function of the test, the appropriate load can be selected so that the specimen is not destroyed.

-Each control board has 3 digital sensor inputs and 3 analog sensor inputs.

-4-way photoelectric isolation DI, 4-way photoelectric isolation DO.

-Hydraulic source control:

(1) Stop and start the oil pump;

(2) High pressure and low pressure conversion of oil source system pressure.

(3) It has the functions of liquid level alarm, oil temperature alarm and blocking alarm

-Remote operation: with test stop, protection and other information SMS trigger function, during the test, when the test stops for some reason, the information will be sent to the preset mobile phone in the form of SMS, which provides convenience for the operator in the long-term test


Main Technical Specification

1.           Maximum test force25kN
2.      Test force measurement range2%-100%FS
3.      Test force resolution1/250000 of full scale (no binning, no resolution)
4.      Test force indication accuracy± within 0.5%.
5.      Displacement measurement range0-150(±75)mm
6.      Displacement measurement resolution (mm)0.001
7.      Displacement measurement indication relative   error± within 0.5%.
8.      Test waveformSine wave, triangle wave, square wave, trapezoidal wave, etc
9.      Column spacing450mm
10.  Vertical test space800mm
11.  Test frequency0.01-100 (the higher the frequency, the smaller the amplitude)
12.  Pumping station flow14L/min
13.  Pumping station pressure21MPa
14.  Pump station motor power5.5KW
15.  Dimensions785×628×2250mm;  950×1450×1220 (mm)
16.  Total weightAround: 1500kg



Main Accessories

ItemNameQtyRemark
 1         Frame1 set                                                                                  
 2         Actuator 25KN1 set
 3         Servo valve 36L/min1 set
 4         Load cell (25KN)1 set USA Celtron
 5         Displacement Sensor (150mm)1 set
 6         Accumulator (0.63L,31.5MPa)2 set
 7         Hydraulic power system (include below:))

 8         Motor 1KW,380V AC1 setSwiss ABB
 9         Pump (14L/min,21MPa  Japan   Nachi)1 set
 10      Valve block assembly1 set
 11      Hydraulic oil Connector etc.,1 set
 12      Electrical parts, replay, AC connector etc.,
 13      Servo control system controller1 set
 14      Fatigue test Software1 set
 15      Computer (HP English Win10)1 set
 16      Fluid part connector all taper sealing1 set
 17      Hydraulic clamping body (tensile grip)1 set
 18      Jaws Φ3~φ18,5~202 sets
 19      Accessories1 set
 20      Operation manual1 pc
 21      Control software manual1 pc
 22      Quality certificate1 pc
 23      Packing list1 pc
 24      External cooling device (Optional)

 25      Other test fixture (optional)



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