A high-precision salt swelling test equipment

Abstract

The invention discloses high-precision salt expansion testing equipment. The high-precision salt expansion testing equipment comprises a test sample barrel and a temperature regulation and control system; the test sample barrel comprises an outer barrel and an inner barrel arranged in the outer barrel; the temperature regulation and control system comprises a circulating liquid temperature control device A and is circularly communicated with a peripheral circulating liquid chamber composed of a gap between the outer barrel and the inner barrel through a circulating liquid pipeline; the high-precision salt expansion testing equipment is characterized in that the inner barrel is formed by splicing a plurality of inner barrel sections along the axial direction; between every two adjacent inner barrel sections, a cone-frustums-shaped structure with an upward upper end face of the inner barrel section of the lower side is inserted into a corresponding tapered-hole-shaped structure of the lower end face of the inner barrel section of the upper side to be matched and connected; the inner barrel section at the lower end does not constrain upward movement of the inner barrel section at the upper end; a sealing film is arranged at an outer part of a matched part of the adjacent inner barrel sections and is used for isolating a matching gap and the peripheral circulating liquid chamber outside the inner barrel. By adopting the high-precision salt expansion testing equipment, more environment parameters can be controlled and a test simulation effect is improved; the high-precision salt expansion testing equipment has the advantages of simple structure, high testing precision, flexible and adjustable test sample parameters and more testing manners.

Description

technical field [0001] The invention relates to the field of research on salt expansion hazards of saline soil, in particular to a high-precision salt expansion test equipment. Background technique [0002] saline soil is saline and alkaline earth and various salinization, alkaline soil the general term for. Saline soil refers to the soluble salt content in the soil that is significantly harmful to crop growth. Soil . Salt content indicators vary with different salt compositions. Alkaline soil refers to the soil containing a large amount of exchangeable sodium that harms plant growth and changes soil properties. Saline soil is mainly distributed in inland arid, Half arid area , There are also distributions in coastal areas. The area of ​​saline soil in the world is about 8.97 million square kilometers, accounting for about 6.5% of the world's total land area and 39% of the total area of ​​arid regions. The area of ​​saline soil in China is about 200,000 square...

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Problems solved by technology

At present, the existing salt expansion tester still has the following shortcomings: ①It can only do the salt expansion test under the action of temperature (freeze-thaw cycle, temperature gradient) and load, and cannot realize the dry-wet cycle with continuous change of water content under constant temperature The salt expansion test cannot realize the salt expansion test coupled with the freeze-thaw cycle and the dry-wet cycle under load; ②The function is simple and the degree of integration is low; ③The sample bucket with an overall structure is used, and the sample size and height of the salt expansion test are relatively large , during the test, the sample bucket significantly constrains the vertical salt expansion of the sample, resulting in significantly smaller test results; ④ The height of the test bucket is fixed, resulting in limited adjustment of the sample height and size

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