Method for improving properties of expansive soil by utilizing silica fume

A standard technology of expansive soil and geotechnical test methods, applied in the field of geotechnical engineering, can solve the problems of surrounding environment and groundwater pollution, environmental burden, greenhouse gas emissions, etc. Effect

Inactive Publication Date: 2018-08-10
HOHAI UNIV
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Problems solved by technology

But at present, lime and cement are mainly used to improve expansive soil in projects. Lime and cement as modifiers need to be produced. The production process will cause a large amount

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  • Method for improving properties of expansive soil by utilizing silica fume

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[0023] In this example, the expansive soil was taken from the slope of the Donghe River in Qinhuai. According to the Standard for Geotechnical Test Methods (GB / T50123-1999), the natural dry density of the expansive soil was 1.58g / m 3 , The free expansion rate is 55%, the optimal water content is 19.2%, the plastic limit is 23.2%, the liquid limit is 51.6, the plasticity index is 28%, the linear expansion rate is 12%, and the lateral compressive strength is 133.2kPa. The cohesive force of the second dry and wet cycle is 3.2kPa, and the internal friction angle of the four dry and wet cycles is 4.8°, as shown in Table 1.

[0024] The method of using silica fume to improve the properties of expansive soil includes the following steps:

[0025] (1) Take 100kg of the expansive soil to be improved, determine its initial moisture content of 24.5%, air dry it to below 10% moisture content, crush it, pass it through a 5mm sieve, and measure its moisture content again to be 8.6%;

[0026] (2) T...

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Abstract

The invention discloses a method for improving properties of expansive soil by utilizing silica fume. The method realizes resource utilization of the silica fume by utilizing the silica fume to improve the expansive soil; the silica fume can be used for replacing or partially replacing the use of traditional expansive soil modifying agents such as lime and cement, so emission of greenhouse gases in cement and lime production processes is reduced, and the method satisfies the concept of sustainable development. The method disclosed by the invention gives an optimal mass mixing ratio of the silica fume as the expansive soil modifying agent; after the expansive soil is processed by using the silica fume of which the mixing amount is 3%, the swell-shrink characteristic of the expansive soil isobviously reduced, the improved expansive soil can maintain relatively good water stability in drying and watering circulation process and is free of surface peeling; and the improved expansive soilmeets the requirements of engineering fillers.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a method for improving the properties of expansive soil by using silica fume. Background technique [0002] Expansive soil is a special clay with many cracks and significant expansibility formed in the natural geological process. The composition of expansive soil is mainly composed of strongly hydrophilic montmorillonite and illite. During repeated drying and wetting, the structure of expansive soil disintegrates rapidly and its strength decreases rapidly. In view of the unfavorable engineering properties of expansive soil, it is necessary to use amendments to reduce the expansion and contraction of soil. But at present, lime and cement are mainly used to improve expansive soil in projects. Lime and cement as modifiers need to be produced. The production process will cause a large amount of greenhouse gas emissions, causing a serious burden on the environment, a...

Claims

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Application Information

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IPC IPC(8): E02D3/12
CPCE02D3/12
Inventor 王保田单熠博韩少阳张海霞张福海张文慧李守德康靖宇赵振梁
Owner HOHAI UNIV
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