This instrument is suitable for determining the ionic polarity of various emulsified asphalt particles, i.e., the type of ionic charge. The test instrument consists of a power cord, electrodes, an adjustable main unit (which can display voltage, current, and time), electrode connection wires, alligator clips, beakers, etc.

Emulsified Asphalt Particle Ionic Charge Tester

Model:LQJHT-0653

I.Product Introduction

The Emulsified Asphalt Particle Ionic Charge Tester was developed and manufactured by our company based on the T0653-2025"Emulsified Asphalt Particle Ionic Charge Test"method in JTG 3410-2025"Test Procedures for Asphalt-Based Asphalt Mixtures in Highway Engineering".In its design and testing principles,it references ASTM D244-23"Test Methods and Operating Procedures for Emulsified Asphalt"and AASHTO T59-16"Test Methods for Emulsified Asphalt"international standards to ensure the scientific validity,standardization,and international comparability of the test results.

II.Technical Parameters

1)Power Supply Voltage:220V

2)Maximum Output Current:150mA

3)Timing Accuracy:1 second,minimum division 0.1s,maximum error±0.10s/h.

4)Timing Time:Adjustable from 0-999 seconds

5)DC voltage output:0-36V adjustable,built-in variable resistor,can obtain a DC current of not less than 50mA.

6)Electrodes:Two electrodes,made of stainless steel,each electrode is 100mm±1mm long,25mm±1mm wide,and approximately 1mm thick;the two electrodes are kept parallel,with a spacing of 12mm±2mm.The electrodes have graduation lines,25mm±1mm from the bottom.

7)Support:Equipped with an automatic clamping device,height adjustable.

8)Beaker:Capacity 250mL.

9)Power:200W

10)Ambient temperature:5～40℃

11)Ambient humidity:≤85%

III.Control System Description

1)Current and Voltage Adjustment

Press the voltage button for 3 seconds.The voltage value on the screen will flash.Adjust the adjustable potentiometer left and right.After adjusting to the desired voltage,press and hold the voltage button to complete the voltage adjustment.Press the current button for 3 seconds.The current value on the screen will flash.Adjust the adjustable potentiometer left and right.After adjusting the current to the desired value,press and hold the current button to complete the current adjustment.

2)Time setting method:Press the"Set"button to enter the setting menu;press the time setting button for 3 seconds,the red numbers above the time display will flash,use the up and down keys to adjust the desired time;Press the setting button again until the blue number below flashes.Use the up and down keys to adjust it to match the number above,then press the setting button again to complete the setting.

3)After setting up,hang the sample and press start to begin the test.

4)There is a calibration switch on the back of the main unit.It is used to measure the voltage and current in the"on"position without starting the time relay.After the measurement is completed,switch it to the"off"position to start the time control.

IV.Other Supporting Equipment

Before the test,the electrodes should be cleaned in the following order:xylene(or trichloroethylene,or other chemically pure solvents),98%methylated alcohol or isopropanol(or 95%ethanol),and finally rinsed with distilled water.

After the test,the electrodes and beakers should be cleaned in the following order:kerosene,cleaning solution,tap water,and finally rinsed with distilled water.

V.Methods and Procedures

5.1 Test Methods

1)Preparation

2)The room temperature should be controlled at 23℃±5℃during the test.

3)Clean the electrode plates sequentially with cleaning solution,then dry them.If there are pitting marks on the surface of the electrode plates,gently polish them to remove the pitting,then clean and dry them.

4)Prepare the samples according to T0602.The samples do not need to be filtered.

5.2 Test Procedure

1)Pour the sample into the beaker to a suitable height.

2)Fix the two electrodes with insulating parts to form an electrode assembly,and clamp it to the support with alligator clips.Adjust the height of the support so that the electrode assembly is immersed in the sample in the beaker,with the liquid level flush with the electrode markings.

3)Connect the leads of the two electrode plates to the power supply,turn on the power switch,and gradually reduce the resistance until the current reaches 8~10mA.Immediately start the timer.

4)When the current drops to 2mA or the timer reaches 30 minutes(either condition is met),turn off the switch.Remove the electrode from the sample and rinse it gently with tap water.

5)Observe the electrodes carefully.If a layer of asphalt is clearly precipitated on the negative electrode,the sample is cationic.If a layer of asphalt is clearly precipitated on the positive electrode,the sample is anionic.

6)If the asphalt deposit on the electrode is not obvious,or if the ionic polarity cannot be identified under other circumstances,repeat the test according to the above method.At this point,adjust the resistance to make the current reach more than 50mA,and after timing for 30 minutes,check the asphalt precipitation on the electrode according to 5.2.5;if the asphalt precipitation on the electrode is not obvious,it can be determined to be non-ionic.

7)For slow-cracking emulsified asphalt,especially ultra-stable slow-cracking emulsified asphalt,the test can also be carried out directly according to the requirements of 5.2.6.

VI.Packing List

1)Main unit 1 unit

2)Electrodes 2 pieces

3)Bracket 1 set

4)One 250mL beaker

5)One power cord

6)One instruction manual

7)One certificate of conformity