Preparation method of a gradient structure composite functional raw soil block

Abstract

The invention discloses a preparation method of a compound functional raw soil building block having a gradient structure. The preparation method comprises the following steps: preparing a die composed of N regions and gradient cement-modified raw soil slurry, wherein the use amount of raw soil in the gradient cement-modified raw soil slurry for casting is progressively decreased in sequence, and the use amount of cement is progressively increased in sequence correspondingly, and the progressive increment of the cement of two adjacent groups is 1 to 5%; filling and casting the slurry to outside regions from middle regions in sequence, pulling clapboards out after the filling is finished, carrying out vibration or compression molding and then curing for 48 hours under room-temperature and dark conditions, dismantling the die, and continuing to cure in a sealing manner for 26 days under the same environment to obtain a building block product. The compound functional raw soil building block having the gradient structure, which is prepared by using the preparation method, not only reserves the advantages of a conventional raw soil building material, but also has relatively high strength and stability, has the characteristics of light weight, heat insulation, high strength, good water resistance and the like and is thus a high-performance building material.

Description

technical field [0001] The invention relates to a preparation method of a gradient structure composite functional raw soil block, which belongs to the field of building materials. Background technique [0002] Traditional raw earth building materials have excellent characteristics such as humidity control, ventilation, fire prevention, low energy consumption, and low cost, but they also have inherent defects such as low strength, large deformation, and poor water resistance, which lead to buildings using traditional earth materials. Shock resistance, water resistance and volume stability are poor. In view of this, scholars at home and abroad have done a lot of research on the modification of raw soil, for example, by adding cement, lime, etc. to improve the strength and water resistance of raw soil materials, etc., but the problem that has not been solved is: the addition of cement and other modified materials If the addition amount is small, the improvement of the above-me...

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Problems solved by technology

[0002] Traditional raw earth building materials have excellent characteristics such as humidity control, ventilation, fire prevention, low energy consumption, and low cost, but they also have inherent defects such as low strength, large deformation, and poor water resistance, which lead to buildings using traditional earth materials. Poor shock resistance, water resistance and volume stability

In view of this, scholars at home and abroad have done a lot of research on the modification of raw soil, for example, by adding cement, lime, etc. to improve the strength and water resistance of raw soil materials, etc., but the problem that has not been solved is: the addition of cement and other modified materials If the addition amount is small, the improvement of the above-mentioned defects of the raw soil material will not be obvious; if the addition amount of the modified material is large, the inherent excellent characteristics of the raw soil material such as heat preservation, humidity control, and pollution-free return to nature will be lost.

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