Atterberg Limits

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Atterberg Limits

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Atterberg Limits (Liquid Limit Testing)

Liquid limit testing determines the water content at which soil changes from a liquid to a plastic state. It is determined using the devices on this page. To perform, a soil sample is placed into the cup of the liquid limit machine and separated into two halves using a grooving tool. The crank on the machine is then rotated so that the cup holding the sample strikes the base of the test machine. The number of blows is recorded until the two halves flow together and close the groove.

Liquid Limit Machine, Liquid Limit

Unit consists of brass cup, cam mechanism, carriage and crank mounted on a hard rubber base. Includes H-4229 ASTM grooving tool and gauge block. Crank can be shifted to right- or left-hand operation. Complies with ASTM D4318; AASHTO T89, T90.

Motorized ASTM Liquid Limit Machine

Motorized liquid limit machine gives uniform testing with greater degree of accuracy. Unit is comprised of H-4230 ASTM liquid limit machine with geared motor to give proper operating speed and automatic counter. Machine is attached to metal plate with rubber feet. Includes H-4229 ASTM grooving tool and gauge block. Complies with ASTM D4318; AASHTO T89, T90.

Liquid Limit Machine, ASTM with Counter

Hand-operated liquid limit machine features mechanical revolution counter attached to the shaft to register the number of drops in the liquid limit cup. Includes H-4229 ASTM grooving tool and gauge block. Crank can be shifted for left or right-hand operation. Complies with ASTM D4318; AASHTO T89, T90. Shipping wt. 9 lbs. (4.1kg)

Cone Penetrometer, Digital

The H-5236 digital cone penetrometer features an aluminum base with leveling screws and a spirit level for maintaining a level testing position. The digital readout provides readings in 0.1mm resolution in either mm or inches. The chromed support rod features micro-metric vertical displacement for accurate positioning with a brass slider that provides smooth free fall, a stop and release button and an automatic zero set. Includes a stainless steel penetration test cone: 35mm long with a 30° angle, weighing 20g. Two brass cups are included (55 x 35mm and 70 x 45mm) This cone penetrometer can also be used to measure the shear undrained strength of undisturbed and reconstituted soil samples per CEN ISO/TS 17892-06. Overall dimensions are: 8.6" x 6.7" x 16.1" (220 x 170 x 410mm).

Cone Penetrometer, Digital, Semi-Automatic

The H-5237 semi-automatic cone penetrometer is equipped with a magnetic controller device with an electronic, digital, programmable timer that automatically releases the plunger head and ensures free falling of the cone during the five second test. The digital readout provides readings in 0.1mm resolution in either mm or inches. The chromed support rod features micro-metric vertical displacement for accurate positioning with a brass slider that provides smooth free fall, a stop and release button and an automatic zero set. Includes a stainless steel penetration test cone: 35mm long with a 30° angle and a 20g surcharge weight. Two brass cups are included (55 x 35mm and 70 x 45mm) This cone penetrometer can also be used to measure the shear undrained strength of undisturbed and reconstituted soil samples per CEN ISO/TS 17892-06. Overall dimensions are: 8.6" x 6.7" x 16.1" (220 x 170 x 410mm).

Cone Penetrometer, Dial Indicator

The H-4236 cone penetrometer with dial indicator features a 6" (150mm) diameter dial gauge, which is easily readable and is graduated in 0.1mm divisions. Overall dimensions are: 8.6" x 6.7" x 16.1" (220 x 170 x 410mm).

Liquid Limit Resiliency Tester

Used to test resiliency of hard rubber base of liquid limit machines, which should be done at 90-day intervals to ensure base is in compliance with ASTM D4318 standard.

Durometers

As required by ASTM D4318, a durometer is used to test the hardness of the base of a liquid limit machine. Sealed springs maintain load deflection rate to a tolerance of .0004". H-4222D is used to check the hardness of the base of Liquid Limit Machines and complies with ASTM D4318, D2240.

Plastic Limit Set

Includes all apparatus recommended to perform plastic limit test in accordance with specifications. Set includes the following: (1) H-4253.1 plastic limit plate, 12 x 12 x .375" (305 x 305 x 9.5mm) thick; (1) H-4930.250 mixing dish; (1) H-4904 spatula; (1) H-4915.025 graduated cylinder, and (1) H-1350.3A Pkg. of 48 sample cans All components are also available individually.

Plastic Limit Plate

12 x 12 x 3/8"-thick (305 x 305 x 9.5mm) glass plate with ground finish on one side and seamed edges. Complies with ASTM D4318; AASHTO T90.

Plastic Limit Roller

Humboldt's Plastic Limit Roller provides an easily repeatable mechanical technique that provides consistent results in accordance to ASTM D4318 and AASHTO T 90 specifications for testing plastic limits of cohesive soils. The Plastic Limit Roller consists of a rigid acrylic bottom plate with 0.125" (3.2mm) side rails and a top plate of the same material with an integral handle that assists with operation. In operation, soil samples are placed on a sheet of adhesive-backed absorbent paper, which is placed onto the bottom plate of the roller. This paper adds no fiber to the soil samples. Soil samples are then rolled between the top and bottom plates until it comes in contact with the bottom plate's side rails, which prevent further operation.

Adhesive Paper

Pad of 50 sheets of special adhesive backed paper for plastic limit.

Shrinkage Limit Set

Apparatus recommended to perform shrinkage limit test in accordance with specifications. Set includes: (1) H-4256 monel shrinkage dish; (1) H-4930.250 mixing dish; (1) H-4254C crystallizing dish; (1) H-4255A shrinkage prong plate, (1) H-4256 shrinkage dish, and (1) H-4915.025 graduated cylinder All components are also available individually.

Monel Shrinkage Dish

This monel shrinkage dish is used with in the shrinkage limit test, ASTM D4943.

Crystallizing Dish

Glass dish used in the ASTM D4943 shrinkage limit test.

Atterberg Limits equipment is used to determine the critical water content of fine-grained soils, including liquid limit and plastic limit. These tests help classify soil behavior and ensure reliable results in construction and geotechnical engineering projects.