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Civil engineering material volume change test instrument and test method

A technology of volume change and geotechnical materials, applied in the direction of material thermal expansion coefficient, etc., can solve the problems that the volume change of geotechnical materials cannot be measured, and achieve the effect of reducing influence, reducing test error and improving accuracy

Active Publication Date: 2014-08-27
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a geotechnical material volume change tester and a test method in order to solve the problem that the existing test instruments cannot measure the volume change of various geotechnical materials at different temperatures with higher precision

Method used

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  • Civil engineering material volume change test instrument and test method
  • Civil engineering material volume change test instrument and test method
  • Civil engineering material volume change test instrument and test method

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specific Embodiment approach 1

[0041] Specific implementation mode one: combine Figure 1 to Figure 5 Describe this embodiment, this embodiment includes a base 1, a sealing rubber ring 3, an upper cover 4, a sealing screw 10, a plastic tube 11, a scale glass tube 12, a probe thermometer 13 and a fixing frame 14, and the base 1 consists of a boss 1- 1 and the bottom plate 1-2, the boss 1-1 is set at the center of the upper end surface of the bottom plate 1-2, the boss 1-1 is integrated with the bottom plate 1-2, the upper cover 4 is barrel-shaped, and the upper cover 4 There is an annular groove 4-1 on the edge of the center hole of the lower end surface, the sealing rubber ring 3 is set in the annular groove 4-1, the upper cover 4 is fastened on the base 1, and the upper cover 4 is connected to the base 1 by four fastening screws 2. The base 1 is connected, the top of the upper cover 4 is provided with an air intake and exhaust hole 4-2, the threaded hole 9 can be used for water or air intake, the sealing s...

specific Embodiment approach 2

[0042] Specific implementation mode two: combination figure 1 Describe this implementation mode, this implementation mode is realized through the following steps:

[0043] Step 1, preparing the geotechnical material test piece: making the geotechnical test piece 5 into a cylindrical shape;

[0044] Step 2, calculate the volume of geotechnical specimen 5 before testing: calculate the volume of geotechnical specimen 5 according to geotechnical specimen 5 diameters and height, also can adopt the volume of geotechnical specimen 5 to record by wax seal drainage method, obtain by two ways The volume of V is denoted as V 0 ;

[0045] Step 3, install the geotechnical test piece 5: place the geotechnical test piece 5 on the boss 1-1, place the stopper 8 on the upper end surface of the geotechnical test piece 5, and use the waterproof rubber mold 6 to place the stopper 8 and the geotechnical test piece 5 and the cylindrical surface of the boss 1-1 are completely wrapped, and the rubb...

specific Embodiment approach 3

[0056] Specific implementation mode three: combination figure 1 Describe the present embodiment. In the present embodiment, the diameter of the geotechnical test piece 5 in step 1 is φ40mm±2mm, and the height is 50mm˜90mm. Other steps are the same as in the second embodiment.

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Abstract

The invention relates to a civil engineering material volume change test instrument and a test method, in particular to a material volume change test device and test method in civil engineering. According to the test instrument, a sealing rubber ring is arranged in an annular groove, a base is covered with an upper cover, an air intake and exhaust hole is formed in the top end of the upper cover, one end of a probe thermometer is arranged in the upper cover, the other end of the probe thermometer is arranged outside the upper cover, a plastic pipe is arranged on the upper end face of the upper cover and communicated with a cavity, and a graduated glass pipe is communicated with the plastic pipe. The test method comprises the steps that first, a civil engineering material test piece is prepared; second, the volume of the civil engineering test piece before a test is calculated; third, the civil engineering test piece is installed; fourth, liquid is injected into the cavity; fifth, the temperature of the civil engineering test piece is measured in an initial temperature environment; sixth, the temperature of the civil engineering test piece is measured in a measuring temperature environment; seventh, the initial temperature and the measuring temperature of the test piece are measured, and the number of division of the test piece is calibrated; eighth, the volume variation theta Vt of the civil engineering test piece is calculated; ninth, the volume expansion coefficient lambda of the civil engineering test piece is calculated. The civil engineering material volume change test instrument and the test method are used for measuring the volume change situation of the civil engineering material.

Description

technical field [0001] The invention relates to a test device and a test method for volume change of materials in civil engineering, in particular to a tester for volume change of geotechnical materials and a test method. Background technique [0002] At present, the volume measurement of geotechnical materials such as soil, concrete and other materials is mostly through the test of its size, and then the volume change is calculated. This test method is not very accurate under the condition of conventional small-sized test pieces. However, the volume change of these materials with temperature changes is often the key to some scientific problems. In addition, especially for geotechnical materials with a certain water content, such as soil, the volume change in the case of frost heaving often causes major problems in engineering, and there is still a lack of instruments and test methods in this regard. Therefore, there is a great demand for instruments and test methods for ef...

Claims

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Application Information

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IPC IPC(8): G01N25/16
Inventor 许勐张锋王东升荆儒鑫
Owner HARBIN INST OF TECH
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