Rapid CBR Puncture Tester

Rapid CBR Puncture Tester

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Rapid CBR Puncture Tester
  • Rapid CBR Puncture Tester
Rapid CBR Puncture Tester
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Rapid CBR Puncture Tester

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Rapid CBR Puncture Tester – QualiGTX™ CBR R

Geotextile CBR Puncture and Burst Tester

The QualiGTX™ CBR R is designed to evaluate the resistance of geosynthetic materials to penetration under static loading conditions. It measures the maximum force required for a plunger to penetrate a clamped specimen, providing a peak puncture resistance value in kilonewtons (kN). The instrument accommodates a wide range of materials, including geotextiles, geomembranes, geogrids, drainage boards, and geosynthetic clay liners. During testing, its 5 kN load frame drives the plunger into the specimen held between two circular clamping rings. A load cell continuously measures the applied force in relation to displacement, generating a force-displacement curve. The highest point on this curve represents the material's puncture resistance and helps determine its ability to withstand localized pressure from angular aggregate and other irregular surfaces beneath an overlying load.

A key aspect of the QualiGTX™ CBR R is its automated specimen clamping mechanism, which eliminates the need for manual securing before each test. The system applies consistent clamping pressure whenever a new test begins, reducing operator-related differences that can affect measurement repeatability. An industrial touchscreen microcomputer manages the testing process, displays the force-displacement curve in real time, and generates a structured report upon completion. Test data can also be exported for further evaluation or transferred to a laboratory information management system, eliminating the need for manual data entry.

The tester supports the quality control and material evaluation requirements of geosynthetic manufacturers, certification organizations, and construction testing laboratories. Its adaptable configuration allows different specimen types to be tested using the same load frame, with the appropriate plunger and clamping accessories. Compatible materials include woven separation geotextiles, smooth HDPE liners, composite geomembranes, plastic geogrids, drainage boards, and bentonite mats. This versatility provides laboratories handling multiple geosynthetic product categories with a consolidated testing solution.

Rapid CBR Puncture Tester – QualiGTX™ CBR R Applications

Resistance to static puncture is an important selection criterion for geosynthetic materials installed beneath heavy loads or against surfaces containing sharp, irregular particles. The QualiGTX™ CBR R supports material assessment and quality verification across a variety of applications:

  • Landfill Liner and Cap Systems: Evaluates the puncture resistance of protective geotextiles and liner sheets exposed to drainage aggregates and waste debris under landfill loading conditions.

  • Mining Heap Leach Pads and Tailings Facilities: Assesses liner and cushioning material performance beneath coarse ore and rockfill, where penetration damage can create pathways for groundwater contamination.

  • Road and Railway Subgrade Separation: Determines whether separation and stabilization geotextiles can withstand contact with railway ballast and crushed aggregate when installed beneath these layers.

  • Canal, Reservoir, and Pond Lining: Verifies the ability of geomembranes and protective cushioning layers to resist penetration by stones in the underlying subgrade throughout extended service periods.

  • Geosynthetic Clay Liner Production: Measures the puncture resistance of bentonite mats during routine manufacturing quality control.

  • Geogrid and Drainage Board Manufacturing: Determines the load-bearing capacity of geogrid junctions and drainage board cores before localized failure occurs.

  • Third-Party Certification and Acceptance Testing: Provides documented puncture resistance measurements to support project submissions, product verification, and material conformance programs.

  • Materials Research and Product Development: Enables comparisons of fiber compositions, bonding techniques, and mass per unit area to evaluate their influence on puncture resistance.

Rapid CBR Puncture Tester – QualiGTX™ CBR R Key Features

The QualiGTX™ CBR R integrates a 5 kN testing frame with automated specimen handling and digital reporting. Its configuration supports consistent puncture measurements across different geosynthetic materials and routine laboratory testing requirements.

  • Automatic Specimen Clamping: Applies controlled, repeatable pressure to the specimen through an automated ring assembly. This reduces inconsistencies associated with manual clamping torque and helps prevent measurement errors caused by specimen slippage.

  • Industrial Touchscreen Microcomputer Control: Provides centralized operation of the complete testing sequence, with real-time visualization of the developing force-displacement curve.

  • 5 kN Load Capacity: Supports puncture resistance testing of geotextiles, geomembranes, composite liners, geogrids, drainage boards, and bentonite mats using one testing frame.

  • ±1% Indication Accuracy: Provides reliable force measurements for material conformance assessments, quality assurance, and product certification.

  • 0.02% Minimum Resolution: Detects small changes during the initial stages of force development, including the gradual loading response of soft nonwoven materials.

  • 10 to 60 mm/min Test Speed Range: Offers adjustable testing speeds to accommodate different geosynthetic puncture testing protocols without requiring hardware modifications.

  • 110 mm Vertical Stroke: Provides sufficient plunger travel for highly extensible specimens to undergo substantial deformation before rupture.

  • Automatic Report Generation: Produces a formatted test report after each completed run, providing a ready-to-file record for laboratory documentation or client reporting.

  • Data Export and Analysis: Allows test results to be transferred for statistical evaluation or integration with laboratory information systems.

  • Broad Material Compatibility: Supports testing of geotextiles, geomembranes, composite geomembranes, plastic geogrids, drainage boards, waterproofing boards, and geosynthetic clay liners.

Theory and Method

In practical installations, geosynthetic puncture damage generally develops under sustained pressure rather than sudden impact. As soil, aggregate, or other overlying materials exert pressure, the geosynthetic is forced against stones and debris beneath it. The resulting contact stress gradually increases over an extended period. Static puncture testing simulates this loading condition by moving a plunger into a securely clamped specimen at a controlled, relatively low speed. As the plunger advances, the material stretches around its tip and the applied force increases. Once the specimen reaches its maximum load-bearing capacity, it can no longer distribute the developing stress effectively. Penetration then begins, producing a sharp reduction in the measured force. The highest force recorded immediately before this failure represents the specimen's puncture resistance.

The arrangement of the clamping rings plays an important role in determining the resulting measurement. When a specimen is secured between circular rings, the unsupported central section is exposed to the advancing plunger. This produces biaxial tensile deformation as the material stretches in multiple directions, unlike the predominantly uniaxial deformation associated with conventional strip tensile testing. The resulting stress condition provides a closer representation of buried geosynthetic behavior, where the material is constrained by surrounding soil rather than having an unsupported free edge.

Plunger diameter and the clear opening of the clamping assembly also influence how the specimen fails. A larger plunger distributes the applied load across a wider contact area, allowing extensible nonwoven materials to deform and draw down before rupture. A smaller plunger concentrates the applied force over a more localized region, increasing the likelihood of localized material failure. Consequently, puncture resistance results are directly comparable only when the testing geometry is consistent.

The QualiGTX™ CBR R controls this loading process through a load cell with ±1% indication accuracy and 0.02% minimum resolution. These measurement capabilities capture changes throughout the force-displacement response, including the transition region where extensible materials begin to yield. Its adjustable test speed of 10 to 60 mm/min accommodates the loading rates specified in different geosynthetic puncture protocols. Maintaining the required speed is important because polymer stiffness can increase as the rate of applied loading rises. The 110 mm vertical stroke provides the travel needed for highly extensible materials, particularly needle-punched nonwovens, to undergo substantial deformation before tearing. This allows the test to continue until actual specimen rupture rather than ending prematurely because the plunger has reached its travel limit.

Rapid CBR Puncture Tester - QualiGTX™ CBR R Technical Specifications

Parameter Specification
Test Principle Static puncture, plunger driven through a clamped circular specimen
Measured Property Peak puncture resistance (kN), force versus displacement curve
Maximum Test Force 5 kN
Indication Accuracy ±1%
Minimum Resolution 0.02%
Test Speed Range 10 to 60 mm/min
Vertical Stroke 0 to 110 mm
Specimen Clamping Automatic
Control System Industrial touchscreen microcomputer
Data Output Automatic report generation, data export for analysis
Compatible Materials Geotextile, geomembrane, composite geomembrane, plastic geogrid, drainage and waterproofing board, geosynthetic clay liner
Voltage AC 220 V, 50 Hz (110V is also available)
Dimensions (W × D × H) 700 × 620 × 1360 mm
Weight 150 kg

Delivery time varies upon stock availability. Our standard dispatch and shipping times are generally within 1 week, however for some high demand items the delivery may be extended to 2-3 weeks. If you require these items urgently please contact us to check accurate stock availability and to organize faster shipping methods.

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Delivery time varies upon stock availability. Our standard dispatch and shipping times are generally within 1 week, however for some high demand items the delivery may be extended to 2-3 weeks.

Need it urgently? Contact us here to check stock and organize faster shipping.

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