i.product standard
1) dshd-0719a automatic wheel tracking tester is designed as per t0719“bituminous mixture wheel track test” in the industry standardjtj052 specification and test methods of bitumen and bituminousmixture for highway engineering.
2)dshd-0719a automatic wheel tracking tester is a researchtype,which can be used for colleges and universities as well asscientific research institutes to make research on the resistanceto rutting of bituminous mixture at high temperature.
3)dshd-0719a automatic wheel tracking tester can be applied tomanufacturing companies and construction companies to determine theresistance to rutting of bituminous mixtures at hightemperature. ii.main characteristics
1.dshd-0719a automatic wheel tracking tester can be connectedto any computer processing system using newly developedmicroprocessor controlling techniques by us.
2dshd-0719a automatic wheel tracking tester can makedetermination for two test molds at the same time with waterimmersion or without water immersion. the constant temperature caseequipped with the instrument can preheat 7 piece of test mold. thissaves a lot of time.
3.dshd-0719a automatic wheel tracking tester adopts pwm modefor temperature control. the instrument can simultaneouslycontrol:
(1)sample temperature;
(2)water temperature in the water case during water immersiontest;
(3)temperature in the constant temperature case
4.the constant temperature case is heated using outer circulationmode. the heating source connects with the case through pipes toform thermodynamic equilibrium, so the temperature isuniform.
5.dshd-0719a automatic wheel tracking tester can displaytime-displacement curve and time-temperature curve at the sametime. this provides experimental evidence on ruttingcharacteristics of bituminous mixture for scientific researchinstitutes.
6dshd-0719a automatic wheel tracking tester adopts a absolutetemperature sensor for temperature collection, so there is no driftduring long time test (this solves the problem of commonthermocouple that the effect of drift on test data during long timetest).
7.dshd-0719a automatic wheel tracking tester adopts highprecision a/d (16 digits) and d/a (16 digits) module to ensure goodaccuracy and high resolution for displacement measurement andtemperature control.
8.equipped with software, dshd-0719a automatic wheel trackingtester can preset test time and test temperature as yourrequirements, and it can recall deflection values of any test moldsand show them in real time.
9.dshd-0719a automatic wheel tracking tester adopts wheelmoving mode as its mechanical structure. this is the same as thatof foreign products. the test data is close to the realcondition.
10.the thickness of test molds is in the range of 0~100mm. they canmeet rutting test requirements of different road surfaces. iii.main technical parameters
1.applicable standards: jtj052 t0719-2000;
2.rolling speed of roller: 42±1 times/minute (one way);
3.moving distance of test vehicle: 230±10mm;
4.hardness of rubber of rolling wheel: 78±2 (international standardhardness);
5.pressure between rolling wheel and test mold: 0.7±0.05mpa (60℃);
6.measurement range of displacement: 0~30 mm;
7.measurement accuracy of displacement: less than ±0.005 mm;
8.test duration: 60~240min;
9.temperature controlling range of constant temperature case: roomtemperature~80℃; accuracy is ±0.5℃;
10.power supply: 380 v, 50 hz;
11.size of main unit: 1510mm*1058mm*1460mm;
12.weight: 300 kg;
13.size of test mold: 300mm×300mm×50mm; it can be used to make ruttingtest for test sample of 30~150mm in thickness.
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