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Geosynthetics Testing
2018/07/06
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What Is Geosynthetics?
Geosynthetics is a general term of synthetic products which are applied in the geotechnical engineering and civil engineering to stabilize terrain.
Different products of geosynthetics have different features and functions and can be applied to many engineering fields.
There are six main functions that geosynthetics can provide and many products provide one or more of these functions.
Preventing intermixing of soil types or soil/aggregate to maintain the integrity of each material yet still allow the free passage of liquids/gases. Commonly used in between sub-base/subgrade and around drainage materials.
Allowing fluids and gases to flow both through the plane of the material. Commonly used as components in geocomposites used for surface water runoff or for gas collection under membranes.
Restraining soil particles subject to hydraulic forces whilst allowing the passage of liquids/gases. This
function is often partnered with separation e.g. in coastal defence applications or wrapped drains.
Application of Geosynthetics
Applied fields:
Geotechnical Engineering
Civil Engineering
Water Conservancy Project
Environmental Engineering
Traffic Engineering
Municipal Engineering
Land Reclamation Project,etc.
Now we recommend some Geotextile Testing Equipment as belows :
Vertical Water Permeability Test Apparatus for Geostextile
Transparent construction, convenient to observe whole processes of test; Use stainless steel lifting screw to adjust max. water head height and servo control system to keep water head constant; Equipped with water cycling system; Water flow velocity precisely controlled by servo control system instead of water tap;Timer to time the whole process of test.
Constant Head Test(ASTM D4491)
Vertical Water Permeability Test without Load
Place the specimen in clamp
Holding the head at 50 mm
Record the values of time (t), quantity of flow (Q) as collected from the discharge pipe, and water temperature (T)
Make at least five readings per specimem
Average value of permittivity is reported
In-plane Water Flow Rate Test Apparatus
Geotextile specimen size is 305*300mm(L*W)
Geotextile should be sandwiched between two thick rubber sheets to prewent any leakage
Exhaust gas and check the sealing condition under the normal pressure of 5 to 10 kPa
Normal pressure of 25kPa is applied on the specimen
Test is performed at different gradients of 0.25,0.5 and 1.0
Record the values of time (t), and the volume of water(V)
Make at least three readings per specimem
Average value of flow velocities is reported
Repeat the test under the normal pressure of 100and 250 kPa.
Plastic Carbon Black Dispersion Test ASTM D5596
This test method consists of two parts:
Microtome specimen preparation
Microscopic evaluation
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