ASTM D6496 Test Fixture

Description

ASTM D6496- Standard Test Method for Determining Average Bonding Peel Strength Between Top and Bottom Layers of Needle-Punched Geosynthetic Clay Liners

 

ASTM D6496 covers the laboratory determination of the average bonding strength between the top and bottom layers of a sample of a geosynthetic clay liner (GCL).

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ASTM D6496 / Significance and Use

The bonding strength test for the top and bottom layers of the geosynthetic clay liner is intended to be an index test.

It is anticipated that the results of the test will be used to evaluate the quality of the bonding process.

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ASTM D6496 / Apparatus

Tensile Testing Machine—A constant rate of extension (CRE) type of testing machine described in Specification D76/D76M shall be used with a minimum precision

measuring capability of 0.1 N/m [5.71 × 10–4 lbf/in.].

Fixed Member—A fixed or essentially stationary member carrying one clamp.

Movable Member—A movable member carrying a second clamp.

Clamps—The clamps shall be a minimum 25 by 100 mm [1 by 4 in.] and with appropriate clamping power to prevent slipping or crushing (damage).

Clamps for holding the test specimen between the fixed member and the movable member of the test apparatus can be either a fixed or self aligning type.

Fixed clamps are rigidly attached to the fixed and movable members of the test apparatus.

Extreme care should be taken when this type of clamp is used to ensure that the test specimen is inserted and clamped so that the long axis of the test specimen

coincides with the direction of pull through the centerline of the clamp assembly.

Self-aligning clamps are attached to the fixed and movable members of the test apparatus.

This type of clamp assembly is such that they will move freely into alignment as soon as any load is applied as long as the long axis of the test specimen will coincide

with the direction of the applied pull through the centerline of the clamp assembly.

The specimens should be aligned as perfectly as possible with the direction of pull so that no rotary motion will occur in the clamps thereby inducing slippage;

there is a limit to the amount of misalignment self-aligning clamps will accommodate

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Summary of Test Method

The top and bottom layers of a geosynthetic clay liner are gripped individually in tensile grips and pulled at a constant rate of extension by a tensile testing machine

until the top and bottom layers of the specimen separate.

The average bonding peel strength of the test specimen can be calculated from machine scales, dials, recording charts, or an interface computer.

*** Before conducting ASTM D6496 , it is important to read the entire specification. Standards can be obtained from appropriate standard authorities.

 

***PARSROS  offers several types of grips and fixtures which will enable you to perform a variety of tests

  that are accurate and repeatable.