Geotechnical filling for use in cold area

Abstract

The invention provides an earthwork filling material for use in cold area, which is formed by waste casting sand, fly ash, cement, polystyrene particles and water according to certain weight percentages. According to the test measurement, the density of the earth work filling material reaches between 0.97 and 1.35x10<3>kg / m<3>, the compression strength reaches between 60 and 292kPa / 7 days, and the compression strength reaches between 116 and 664kPa / 28 days; meanwhile, the earth work filling material also improve the freeze-thaw resistance, the coefficient of thermal conductivity reaches between 0.40 and 0.74W / (m.K) / 7 days, and the coefficient of thermal conductivity reaches between 0.350 and 0.53W / (m.K) / 28 days. The earthwork filling material can reduce the breakdown of an earth filling project caused by frozen expansion in the cold areas and recycle the waste casting sand and fly ash, which cause pollutions on environment, as earthwork filling materials in the earth filling project; moreover, the filling materials, which are secondary industrial wastes, are widely available and low in price, thereby reducing cost.

Description

technical field [0001] The invention belongs to the technical field of civil construction materials, and in particular relates to a geotechnical filler used in cold regions. Background technique [0002] More than two-thirds of my country's land is located in perennial or seasonally cold areas. In these areas, when building roads and other filling projects, we often encounter the problem of damage to filling projects due to weak foundation treatment and freezing and thawing caused by alternating climates. , Frost heaving, uplift and cracking occurred in the filling. Filling soil on weak foundations is prone to insufficient bearing capacity and uneven settlement. If such problems are not prevented, it may cause engineering disasters such as road surface damage, foundation instability and excessive deformation. [0003] Although the use of polystyrene blocks as filling materials has been disclosed at home and abroad, which can prevent frost damage and reduce the weight of fil...

AI Technical Summary

Problems solved by technology

Filling soil on weak foundations is prone to insufficient bearing capacity and uneven settlement

If such problems are not prevented, it may cause engineering disasters such as road surface damage, foundation instability and excessive deformation.

[0003] Although the use of polystyrene blocks as filling materials has been disclosed at home and abroad, which can prevent frost damage and reduce the weight of fillers to a certain extent, but for irregular-shaped fillings and high-strength fillings, polystyrene blocks The cutting of the body will increase the amount of equipment used and the construction period, and insufficient strength will also lead to excessive deformation and damage

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