ASTM D4318 Manual Electric Soil Moisture Content Butterfly Liquid
Limiter
Application:
The dish-type liquid limit meter is composed of a brass dish
containing the sample, a hard high-quality rubber pedestal, an
impact device cam wheel, a calculator, and a grooving knife to
control the drop distance between the dish and the pedestal within
1 cm.
To determine the liquid limit of soil, to classify soil types, to
calculate natural consistency and stagnant index, and to be used
for design and construction.
Technical Specifications:
1. Electric motor drive/manual operation
2. Disk falling frequency: 120 hits/min (allowable error 15%)
3. Built-in strike timer
The method of using the dish liquid limit meter refers to ASTM
D4318 "Standard Test Method for Liquid Limit of Soil"
Scope of application
1) This method is a test method for the determination of soil
liquid limit. The obtained results need to be tested at least 3
times, and a plastic flow curve (FlowCurve).
Methods as below:
1 One-point method, calculate the liquid limit from a single test;
2 Inspection or identification test.
2) Unless it is stipulated that the soil to be tested is allowed to
use the one-point method, the drop-dish method should generally be
used. When the measured results are inconsistent or the soil tested
is specified according to the technical requirements, the
inspection test method or the identification test method should be
used.
Definition
The liquid limit of soil is the boundary water content between the
liquid state and the plastic state, expressed as a weight
percentage of the dried soil. The water content of the limit is
artificially set as: starting from the bottom of the dish, divide
the plaster into two halves, the gap between the two halves is 1/2
inch (12.7 mm), and the dish containing the plaster is 1 cm (0.3937
inch) The water content when the two halves of the soil paste flow
together when the height is dropped 25 times/2 seconds.
Equipment
1 Evaporating dish: Porcelain evaporating dish 4 1/2 inches (114.3
mm) in diameter
2 Soil Conditioning Knife: Soil Conditioning Knife or Blade 3"
(76.2mm) Long and 3/4" (19cm) Wide
3 Liquid limit meter: a mechanical device composed of a copper
plate and a bracket
4 Groovers: A groover with a gauge
5 Capacity: Appropriate container, such as a watch glass with a
lid, to prevent loss of moisture during weighing
6 Balances: Balances with a sense of 0.01 grams
Sample
According to the ASTM method "Dry Preparation of Soil Samples for
Determination of Particle Fraction and Soil Parameters", take about
100 grams of soil samples that have passed through a No. 40 sieve
(425 microns) and have been thoroughly mixed.
