ASTM D3910 Emulsified Asphalt Adhesion Tester and Bitumen Cohesion Tester
Technical parameters
1. The pressure head diameter: Φ 28 mm head thickness: 28.6 mm
2. the rubber gasket at the bottom of the pressure head : diameterΦ28.6 mm thickness 6.4 mm hardness 60 HRC
3. The pressure head pressure: the pressure on the style stage is 128.5 N± 1.0 N head falling speed is not more than 8 cm/s
4.The torque wrench torque range is not less than 3.5 N•m
5. Air pressure gauge range 1 Mpa.
6. Ring mould: the inside diameter : 60 mm thickness of 6 mm respectively, 10 mm.
7. The small pump 0 ~ 1 Mpa, the pressure is adjustable.
Methods and Procedures
1. Familiar tester features and usage of each part of the test specimen preparation used.
2. The sample at a temperature of 25 ℃ ± 2 ℃ environment shaping 30min, the specimen is placed adhesion tester test bench.
3. Gently press the piston rod head by hand, so that it contacts the specimen, the red release button is pulled out, and then pump or air compressor through the inlet port to the pressure of the tester.
4. The pneumatic indenter on the specimen, when the air pressure gauge should be maintained at 0.2Mpa. (I.e., the indenter is pressed against the specimen pressure 128.5N)
5. Keep the pressure constant, the torque wrench dynamometer table is cleared and trap the cylinder rod end, smooth within 0.7s ~ 1.0s, firm, level ground to reverse 90 ° ~ 120 °, reading the torque wrench readings and description style damaged state.
6. promote the release button rising pressure head, wipe clean after use until the next test.
7. 60min, repeat the above steps.
Note 1: Use a pressure gauge pressure regulating valve - filed its knob, when to cheer when the gauge pressure can not be increased, clockwise, continuing pressure can force the gauge pressure reaches the desired value. After setting press can.
Precautions
1. adhesion tester pneumatic circuit using fast-loading pipe fittings, if the test was found leaking joints, the tube can be inserted firmly into the nipple.
2. Note that the test instrument for cleaning and maintenance, to ensure that equipment is clean and free of aggregate and asphalt.
3. Test in strict accordance with the rules to ensure the smooth progress of the test.
Accessory
1. Torque wrenches and connecting pipe 1pc
2. Round tryout（thickness 6mm，10mm）each 3pcs
3. Inflator a group
4. Instructions 1pc
5. Certificate 1pc
6. Quality Feedback Form 1pc
Frequently Asked Questions (FAQ)
Q1: What are the primary testing applications for this ASTM D3910 Cohesion Tester?
A: This instrument is designed to measure the torque development, set time, and early cure time of micro-surfacing and slurry seal mixtures. By measuring the rotational shear resistance (torque) applied to a compacted mixture over time, it determines:
Set Time (Traffic Opening Readiness): Time required to reach 12 kg-cm of torque (mixture can withstand light rolling).
Cure Time (Fully Cured State): Time required to reach 20kg-cm of torque (mixture is ready for heavy traffic opening).
Q2: Which international standards and test methods does this equipment comply with?
A: The tester strictly conforms to global slurry seal and micro-surfacing testing specifications:
ASTM D3910: Standard Practice for Design, Testing, and Construction of Micro-Surfacing.
ISSA TB-139: Test Method for Classifying Emulsified Asphalt Slurry Seal Systems by Measurement of Set and Cure Characteristics via the Cohesion Tester.
EN 12274-4: Slurry Surfacing - Test Methods - Part 4: Determination of Cohesion of the Mix.
Q3: How is the pneumatic pressure controlled to ensure consistent torque readings?
A:Precision Air Pressure Regulator: Features a high-precision pneumatic pressure regulator and digital/dial pressure gauge to maintain a constant downward cylinder pressure (standard 200kPa / 2.0bar / 29psi).
Rubber Foot Pad Standard: Equipped with a standardized neoprene rubber cylinder foot (hardness 60 ±5 Shore A, 28.5mm diameter to ensure stable contact friction without slippage during torque wrench rotation.
Q4: How is the torque measured, and what range does the torque wrench cover?
A:Torque Wrench Spec: Includes a high-precision, calibrated dial or digital torque wrench with a range of 0-35kg-cm ($0-3.5N.m).
Peak Hold Function: The torque wrench features a memory indicator (peak mark) that records the maximum torque applied during manual or semi-automated rotation, eliminating visual reading errors.
Q5: What is included in the standard core package?
A: The standard package includes everything required for immediate lab testing:
Main Pneumatic Cohesion Tester Frame & Cylinder Assembly
High-Precision Air Regulator & Pressure Gauge
Calibrated Dial/Digital Torque Wrench
Standard Rubber Foot Assemblies (Neoprene)
Precision Specimen Molds (Standard sizes: e.g., 60mm*6\mm and 60mm* 10mm)
Neoprene Rubber Base Pads & Mold Ring Scrapers
Calibration Certificate & Comprehensive User Manual
Q6: What auxiliary equipment or gas supply is needed to operate the unit?
A:Air Supply Required: The unit requires a clean, oil-free compressed air source (laboratory compressor or bottled compressed air) capable of delivering 300 - 600 kPa ($3 - 6bar) to the regulator inlet.
Air Connection: Standard quick-connect pneumatic fittings are provided for easy installation in any bitumen testing laboratory.
Q7: How often should the rubber foot and pressure system be calibrated?
A:Rubber Foot Check: Inspect the rubber foot pad before each test. Clean asphalt residues immediately using compatible mild solvents. Replace the pad if the surface shows visible wear, cracking, or hardness changes.
Annual Calibration: We recommend calibrating the pressure gauge and torque wrench once every 12 months using standard laboratory metrology tools.
description2