Rough geomembrane is a material commonly used in civil engineering and environmental protection fields. Accurate measurement of its thickness is crucial to ensuring project quality. This article will introduce the method for measuring the thickness of rough geomembrane, detailing the test principles, instruments and equipment, test conditions, sample preparation, test steps, calculation methods and the contents of the test report.
Test principle:
On the rough surface geomembrane sample, under a specific pressure, use a thickness measuring instrument with a fixed geometry perpendicular to the membrane surface, measure the distance between the measuring heads on both sides of the membrane, and take the average of the multiple measurement results. As the thickness of the rough geomembrane.
equipment:
The Thickness Gauge used should have an accuracy of at least ±0.01 mm and be able to apply a specified pressure (0.56 N±0.05 N). The measuring instrument shall be equipped with a measuring head as the base point and capable of exerting coaxial pressure that can move up and down.
Test conditions:
The test shall be carried out in accordance with the environmental conditions specified in the standard, including a temperature of 23 â ± 2 â, and a state adjustment time of not less than 4 hours.
Sample preparation:
After removing no less than 1m from the outer end of the extracted membrane roll, cut a full geomembrane sample of sufficient length for testing. When cutting the sample, the distance from the edge of the geomembrane roll should be no less than 150 mm, and ensure that the distance between the probe and the edge of the sample is no less than 10 mm.
experiment procedure:
Condition the specimen under specified standard environmental conditions;
Clear the meter;
Insert the sample and adjust the position so that the probe is at the "low point" of the depression on the rough surface, hold it for 5 seconds, and read the thickness value;
Repeat the above steps for each sample and take the minimum value among the readings as the result.
Calculation method:
Use the results for all specimens to calculate the average thickness of the specimen to the nearest 0.01 mm.
experiment report:
The report should include information such as the type of geomembrane tested, sampling method, equipment name, number of specimens, thickness measurement results of each specimen, abnormalities during the measurement process, and laboratory environmental conditions.
Through the above detailed introduction, we can understand the operating steps and key points of the rough geomembrane thickness measurement method, as well as the corresponding test report content, which has important guiding significance for practice in the fields of civil engineering and environmental protection.
