Abstract
At present, the conventional method of detecting the soluble salt ion content of soil takes approximately 2 days in China. Moreover, the method has complicated steps and can only be carried out indoors. The aforementioned drawbacks will delay on-site construction management and affect the construction progress in severe cases. In this study, portable equipment is proposed to detect the content of soluble salt ions of the soil. The proposed method is compared with conventional methods and analysed to develop a construction method for rapid on-site detection of soluble salts. The subgrade soil of the Bariku-to-Mulei section of the Beijing–Xinjiang expressway is tested and studied. Following the electrical conductivity principle of salt solution, the salt content of the soil is measured using a conductivity meter. On the basis of spectrophotometry, the chloride (Cl−)/sulfate (SO4 2−) value of the soil is determined using a portable water quality analyser. The experimental results show that electrical conductivity can characterise the degree of soil salinisation, and a water quality analyser can determine the type of saline soil. These measurement methods are simple and easy to master, and the detection accuracy is high. The equipment is light and portable, can be used outdoors and has the advantage of being low in price.
Highlights
The climate of Xinjiang in China is arid, with low levels of rainfall and strong evaporation, which results in various types of saline soil being widely distributed in this region
A total of 53 soil samples were collected from different aggregate yards and subjected to a conventional soluble salt test to determine the type of saline soil and the degree of soil salinisation
Test principle Following the principle of salt solution conductivity, a conductivity meter could be used to determine the conductivity of the soil solution to characterise the salt content of the soil and the
Summary
The climate of Xinjiang in China is arid, with low levels of rainfall and strong evaporation, which results in various types of saline soil being widely distributed in this region. The conventional methods for detecting the ion content of saline soil can no longer meet the needs of rapid determination of large quantities of samples. The accuracy of this method is high, the aforementioned disadvantages restrict it to being carried out indoors, the number of samples detected at one time is small and the construction unit needs to be equipped with special testing personnel. If the type and degree of salinisation of saline soil can be determined in time, the construction unit can reasonably use and improve the soil. A total of 53 soil samples were collected from different aggregate yards and subjected to a conventional soluble salt test to determine the type of saline soil and the degree of soil salinisation. Test principle Following the principle of salt solution conductivity, a conductivity meter could be used to determine the conductivity of the soil solution to characterise the salt content of the soil and the
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