A multifunctional salt swelling tester

Abstract

The invention discloses a multifunctional salt expansion tester which comprises a sample barrel and a temperature control system. The sample barrel comprises an outer barrel body and an inner cylinder arranged in the outer barrel body. The outer barrel body is vertically installed in a sample barrel frame. The temperature control system comprises a circulating liquid temperature control device A which is in circulating communication with a circumferential circulating liquid chamber formed by a gap between the outer barrel body and the inner cylinder through a circulating liquid pipeline. The multifunctional salt expansion tester is characterized by further comprising a sample humidity control system for controlling the humidity of a sample in the inner cylinder. The multifunctional salt expansion tester can control more environment parameters and improve the test simulation effect, has the advantages of being simple in structure, high in test precision, flexible and adjustable in sample parameters and multiple in test modes, and is quite suitable for the research of salty soil performance.

Description

technical field [0001] The invention relates to the field of research on the harm of salt expansion of saline soil, in particular to a multifunctional salt expansion tester. Background technique [0002] saline soil is saline with 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 k...

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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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