Method for testing swellability of carbonization process of magnesium oxide solidified soil and shear strength of carbonized soil

Abstract

The invention discloses a method for testing swellability of carbonization process of magnesium oxide solidified soil and shear strength of carbonized soil, and belongs to the parameter test of solidified materials for civil engineering. The method comprises a test of temperature, resistivity and volume expansion of a magnesium oxide mixed soil sample during carbonization and solidification, and atest of shear strength of a carbonized sample, and specifically comprises the steps such as device assembly and connection, sample preparation, sensor debugging, carbonization maintenance and physical parameter test, direct shear test preparation and direct shear test. The method provided by the invention monitors the temperature and resistivity changes of the magnesia-solidified soil sample during carbonization and the volume expansion at different positions in real time to evaluate the carbonization progress and expansion characteristics of the material under different conditions. After thecarbonization curing, the carbonization sample is loaded to achieve its fully automatic direct shear test and resistivity test. The method avoids disturbance of the sample during the loading process,has simple operation steps and accurate parameter testing, and is of great significance for the engineering application and evaluation of carbonized solidified soil materials.

Description

[0001] Field [0002] The invention belongs to the test method category of civil engineering materials, and in particular relates to a test method for the expansibility of magnesia-solidified soil carbonization process and the shear strength of carbonized soil. Background technique [0003] With the development of my country's economy and urbanization, urban buildings, transportation and water conservancy and other infrastructure often encounter soft soil layers of different thicknesses, and the soft soil has the characteristics of high water content, large void ratio, low strength, high compressibility, etc. Construction and foundation preparation present enormous challenges. Among the commonly used foundation treatment methods, dynamic compaction method and vibro-construction method are rarely recommended due to the large amount of noise, and the traditional replacement method is prone to uneven distribution of bearing capacity due to the large amount of work and high cost. ...

AI Technical Summary

Problems solved by technology

Although the above direct shear instrument has been greatly improved compared with the traditional direct shear instrument, and simulated the direct shear test of soil in different environments, it still cannot meet the expansibility of the soil during the carbonization process and the shear strength test of the carbonized soil. It is also impossible to complete the detection of the temperature and resistivity of the soil sample during the carbonization process.

[0006] Based on the rapid development of my country's engineering construction and the advantages of new carbonation reinforcement methods, combined with the current situation of difficult parameter testing in the carbonation reinforcement process and inaccurate mechanical parameter testing of carbonized soils, it is urgent to develop a carbonation process of magnesia-solidified soils. Soil shear strength test method is of great significance in the effective use of carbon dioxide, rational engineering design and application, etc.

Images