Electric disc liquid limit gauge

CSDS-1Electric disc liquid limit gauge Manual butterfly liquid plastic limit tester Soil Butterfly Liquid Limit Tester Butterfly measuring instrument Electric butterfly liquid limit tester

The disc type liquid limit tester consists of a brass dish containing the sample and a hard high-quality rubber base, and the distance between the dish and the base is controlled within1The centimeter impact device consists of concave wheels, calculators, slotting knives, etc.

Purpose: To determine the liquid limit of soil, classify soil types, calculate natural viscosity and permeability index for design and construction purposes.

Technical specifications:

1Electric motor drive

2Disc falling frequency:120hit/Minutes (allowable error)15%）

3Built in hit count timer

Refer to the instructions for using the disc type liquid limit gaugeASTM D4318Standard Test Method for Liquid Limit of Soil

1、 Scope of application

This method is a test method for determining the liquid limit of soil. The results obtained must at least undergo3Conduct a secondary experiment and create a plastic flow curve（FlowCurve)The method is as follows:

1One point method, calculate the liquid limit value from a single experiment;

2Inspection or identification testing.

2）Unless it is specified that the soil being tested allows for the use of a single point method, the drop plate method should generally be used. When the measured results are inconsistent or the soil being tested has technical requirements, the inspection test method or identification test method should be used.

2、 Definition

The liquid limit of soil is the boundary moisture content between liquid and plastic states, expressed as a percentage of the weight of the dried soil. The boundary moisture content is artificially determined as follows: starting from the bottom of the dish, divide the soil paste into two halves, and the width of the gap between the two halves is1/2Inches（12.7Millimeters, the dish filled with soil paste1Centimeters（0.3937Falling from a height of inches25time/2The moisture content when the two halves of the soil paste flow together in seconds.

3、 Instrument and equipment

1Evaporator dish: diameter of41/2Inches（114.3Ceramic evaporating dish in millimeters

2Soil adjustment knife: long3Inches（76.2Millimeters), width3/4Inches（19A centimeter sized soil adjustment knife or blade

3Liquid limit gauge: a mechanical device consisting of a copper disc and a bracket

4Slotter: a slotter with a gauge

5Capacity: Suitable container, such as a covered watch dish, to prevent loss of moisture during weighing process

6Balance: Sensitivity is0.01The balance of grams

4、 Sample

pressASTMAccording to the provisions of the method "Dry preparation of soil samples for particle size and soil parameter determination"40Number sieve（425The soil sample, which has been thoroughly mixed and measured in micrometers, is approximately100Ke.

5、 Calibration of liquid limit gauge

1Check the liquid limit gauge to ensure it is in good condition and whether the pin connecting the soil disc is worn and causing the soil disc to move left and right. Are the screws connecting the soil disc and cantilever tightened, and are the grooves in the soil disc worn.

2The scale and adjustment piece on the handle of the slotterHAdjust the soil disc (as shown in Figure 1)CRaise the height so that the contact point between the bottom of the disc and the bottom plate is directly above the bottom plate1Centimeters（0.3937Inches). tighten the screwIFixed adjustment pieceHThe scale on the handle of the slotter (the standard for high volume) remains in its original position, and quickly rotate the handle ring to check if the adjustment is correct. If adjusted correctly, a slight bell like sound will be heard when the concave wheel strikes the concave wheel follower. If the dirt disk rises above the mark or no sound can be heard, it needs to be adjusted.