Method for testing bound water in soil by thermal analysis

Abstract

The invention discloses a method for testing bound water in soil by a thermal analysis. Organic matters, sands, inferior soil and electrolytes in soil samples are removed by being soaked in hydrogen peroxide and repeatedly treated by distilled water, and the soil samples are tested based on the conditions detailed as below: the soil samples are ground into particles of a smaller size; the amountsof the soil samples to be tested are 20 mg; the soil samples are tightly loaded in an appropriate manner; the heating rate is 10 DEG C / min; the test results obtained with a cover and without the coverare compared; the test program adopts initial wait, namely all soil samples are weighed before the test starts. Through the method, the bound water can be classified into different types and the accuracy of the test results is improved, therefore the problem that the bound water is difficult to be classified into different types according to the test results due to the reason in the soil samplesor special treatment required by the test such as drying under high temperature being 250 DEG C can be solved.

Description

technical field [0001] The invention relates to a method for measuring bound water of expansive soil by using a TG-DSC synchronous thermal analyzer, and belongs to the technical field of environmental geotechnical engineering testing. Background technique [0002] Bound water is the water in the electric double layer composed of negative charges on the surface of clay particles and surrounding water molecule dipoles and cation clouds. At the same time, bound water can be divided into strongly bound water and weakly bound water; due to the special The physical and mechanical properties make it one of the common problems closely studied by geotechnical engineering, environmental engineering, soil physics, oil and gas well engineering and other disciplines; due to the different types of bound water adsorbed by clay and the bonding energy state and binding firmness of particles are different Therefore, in the continuous heating process, different types of bound water on the soil...

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Problems solved by technology

However, due to the complexity of the test soil sample composition, different sample preparation methods and different test conditions have different effects on the test results, it is very likely that general test conditions will be used for some special soils or soils that require special treatment. On the one hand, the test results may not find the characteristic peak (valley) value at all, which may result in the inability to measure the bound water content; on the other hand, it may affect the accuracy of the test results

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