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Gyratory Compactor For Asphalt Mixture ASTM D692.jpg

Gyratory Compactor For Asphalt Mixture ASTM D692

A rotary compactor for asphalt is a device used in the laboratory to simulate the compaction process of asphalt mixtures during road construction. It prepares asphalt mixture specimens by combining rotation and vertical pressure to evaluate their volume characteristics, mechanical properties, and construction performance.

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    product details

    Product Description

    Under constant pressure, fixed compaction angle and rotation speed, the asphalt mixture in the test mold is rotary compacted by kneading, simulating the rolling of the road surface by vehicles on site, so that the mixture reaches a dense state, accurately simulating the compaction state on site, and evaluating the compaction characteristics of the asphalt mixture.

    Asphalt Gyratory Compactor is suitable for the rotary compaction method to form ￠150mm or ￠100mm asphalt mixture cylindrical specimens for laboratory use in the physical and mechanical properties test of asphalt mixture. The molded specimens are used for compression deformation strength, shear strength, splitting, rebound and other tests.

    Structural composition

    Loading system: usually composed of electronically controlled cylinders, pressure regulating valves, etc., with continuously adjustable pressure, and vertical loads are accurately applied through servo control.

    Rotation system: The rotational motion is generated by a high-precision eccentric wheel system or other rotating mechanism. The rotation speed is generally around 30 rpm, and the angle can be accurately set and kept constant.

    Measurement system: including displacement sensors, rotary encoders, etc., used to measure data such as rotary compaction displacement and specimen height change.

    Control system: With industrial touch screen, Gyratory Compaction Apparatus can display the process data such as the number of rotations, pressure, displacement, etc. in real time.

    The asphalt compaction instrument consists of hydraulic pressure system, rotating base, demoulding system, data acquisition, data display, deformation, angle and other control systems.

    Connecting to a computer can analyze and calculate the test data, save data and display graphics.

    Features

    1.The hydraulic system is used to form the test piece stably without loosening; the self-contained demoulding system is convenient and fast for molding and demoulding.
    2. Simulate on-site compaction: Simulate the compaction process of asphalt mixture during road construction by combining rotational and vertical pressure.
    3. Precise control: It can accurately control the rotation angle, vertical pressure, and compaction frequency to ensure the consistency of the specimen.
    4. Multifunctionality: Suitable for various types of asphalt mixtures (such as hot mix asphalt, warm mix asphalt, etc.).
    5. Data recording: Real time recording of the height, rotation frequency, and compaction curve of the specimen for easy analysis.
    6. Automated operation: Some models are equipped with automatic loading, unloading, and data storage functions to reduce human errors.

    Parameter

    Voltage 380V (three-phase four-wire)
    Effective size of test cylinder Φ150×200mm; Φ100×160mm
    Vertical pressure of hydraulic cylinder on test piece factory setting is 600kPa±10KPa (Φ150 test piece matching) (Φ100 test piece is adjusted according to the instructions)
    Rated pressure of hydraulic pump station 25MPa
    Compacting rotation angle 0~3°, factory adjusted to 1.16°±0.02°
    Number of rotations 0-999 (settable)
    Compacting speed 30r/min±0.5 r/min
    Main machine dimensions 900*600*2250mm
    Hydraulic system dimensions 500*500*900mm

    FAQ（Frequently Asked Questions）

    1. Standards & Superpave Method Compliance
    Q: Which international test methods and Superpave mix design specifications does this compactor satisfy?
    A: This Superpave Gyratory Compactor is designed and manufactured in strict compliance with ASTM D6925, AASHTO T312, SHRP Superpave, and EN 12697-31. It provides consistent gyratory compaction to evaluate the volumetric properties, density progression, and mechanical characteristics of hot-mix asphalt (HMA) and warm-mix asphalt (WMA).

    2. Compaction Precision & Operating Parameters
    Q: What are the exact compaction parameters (pressure, gyration angle, speed, and height resolution)?
    A:Vertical Pressure: Constant closed-loop controlled pressure at 600 ± 18 kPa (adjustable from 100 to 1000 kPa).
    Internal/External Gyration Angle: Factory-preset to 1.16° ± 0.02° internal angle (AASHTO/ASTM standard) or 1.25° ± 0.02° external angle; easily adjustable for EN standard requirements (0.82°).
    Gyration Speed: Constant 30.0 ± 0.5 RPM.
    Height Tracking & Resolution: High-accuracy linear displacement transducer measuring core height continuously from 0 to 200+ mm with 0.01 mm resolution, recording height per gyration (1 to 999 preset cycles).

    3. Mold Diameters, Sample Extrusion & Accessories
    Q: Which mold configurations are supported, and how are compacted cores extracted?
    A:Mold Sizes: Ships standard with a 150 mm (6-inch) internal diameter hardened alloy steel mold. A 100 mm (4-inch) conversion mold kit is available as an option.
    Integrated Extruder: Built-in electro-mechanical specimen extruder extracts the hot, dense core smoothly out of the cylinder mold with single-button control.
    Standard Inclusions: 150 mm mold assembly, upper and lower platens, paper discs (pack of 500), lifting handles, calibration tools, and power/data cables.

    4. Data Acquisition, Touchscreen & Shear Stress Measurement
    Q: How is test data recorded, and does the system measure gyratory shear stress?
    A:Control Interface: Color industrial touchscreen panel enabling real-time curve plotting (Height vs. Gyration, Density vs. Gyration).
    Data Export: Integrated USB and Ethernet ports for fast export of raw data into Excel/CSV and PDF formats without requiring an active external PC.
    Shear Stress Measurement: Optional load-cell package provides real-time compaction shear stress and Gyratory Shear Index (GSI) calculation to detect mixture tender zones and rutting susceptibility.

    5. Drive Mechanism, Maintenance & Power Requirements
    Q: What drive system powers the unit, and what are the electrical requirements?
    A:Drive Type: Heavy-duty electromechanical drive delivering rigid angle stability without hydraulic oil leakage, high pump noise, or periodic fluid changes.
    Power Supply: Configurable for single-phase 220V/230V (50/60Hz, 1.5–2.0 kW) or 110V/60Hz depending on regional requirements.
    Safety & Calibration: Includes an emergency safety stop button, interlock safety cover, and full factory calibration certificates for load cell, angle, and linear encoder.