Digital-display type pavement material strength instrument

Abstract

The invention provides a digital-display type pavement material strength instrument. The strength instrument comprises a case, and a support is arranged on the upper end face of the case, a force measuring ring is arranged on the support; a force sensor and a penetration rod are arranged on the force measuring ring, and a contact sensor and a displacement sensor are arranged on the penetration rod; a lifting table is arranged at the top of the case, and a test cylinder is arranged on the lifting table, wherein the position of the test cylinder corresponds to the position of the injection rod.According to the invention, the displacement sensor is used for replacing a dial indicator, and a digital display system is used for automatically recording readings to replace naked eye readings, sothe test data can be exported after the test is completed; one person can independently complete the operation, so a large amount of time and manpower are saved, and the test result is more accurate;the contact sensor replaces traditional naked eyes to observe the contact condition of the penetration rod and the surface of the soil sample, and the test result error is smaller, more accurate and more reliable.

Description

Technical field [0001] The invention relates to a digital display pavement material strength meter, which belongs to the technical field of California bearing ratio (CBR) test and detection equipment, and is suitable for testing the strength index of roadbed soil and pavement materials to perform the California bearing ratio (CBR) test detection of soil . Background technique [0002] California load-bearing ratio is the strength index of subgrade soil and pavement materials, and it is one of the main parameters of flexible pavement design. In our country's flexible pavement design, although the elastic modulus of subgrade soil and pavement materials is used as the design parameter, CBR is still used as a mechanical index in the subgrade and pavement construction specifications. It can be seen that the accuracy and reliability of CBR test results are very important for evaluating the mechanical properties of subgrade and pavement materials. [0003] The current working principle ...

AI Technical Summary

Problems solved by technology

[0004] 1. Since the contact surface between the penetrating rod and the soil sample is in the test cylinder, errors are likely to occur in visual observation, resulting in that the penetrating rod is not in full contact with the surface of the soil sample or the penetrating rod is loaded in advance;

[0005] 2. Since it is necessary to read the readings of 3 dial gauges at the same time, multiple people are required to operate the readings and counts at the same time, which is time-consuming and laborious, and human-made readings are prone to large errors, which makes the test insufficient to meet the specification requirements;

[0006] 3. Artificially organize the test results, there are a lot of data, there are a lot of calculations, and it is easy to make mistakes

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