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Layered cement-based composite material and its preparation method

A composite material, cement-based technology, applied in chemical instruments and methods, hydraulic material layered products, lamination, etc., can solve the problems of large fossil energy consumption and difficult dispersion of the matrix.

Inactive Publication Date: 2012-02-01
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the production of various man-made fibers consumes a lot of fossil energy, and it is difficult to disperse in the matrix.

Method used

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  • Layered cement-based composite material and its preparation method
  • Layered cement-based composite material and its preparation method
  • Layered cement-based composite material and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0017] A layered cement-based composite material. The layered cement-based composite material is composed of a cement paste layer 1 and a weak interlayer 2, and the strength of the weak interlayer 2 is lower than that of the cement paste layer 1. In this implementation In the example, the cement slurry layer 1 used is a self-leveling cement slurry layer; the weak interlayer 2 is aluminum foil, paper, foam concrete or high water-binder ratio cement slurry; the total layer of the layered cement-based composite material Count at least 20 layers.

Embodiment 2

[0019] A method for preparing a layered cement-based composite material, comprising the following steps:

[0020] Step 1 Take a mold, lay a layer of weak interlayer material in the mold, pour the self-leveling cement slurry on the weak interlayer, vibrate and make it flat,

[0021] Step 2 After repeating step 1 at least 10 times, remove the mold after standing for 1 day, and then carry out standard maintenance.

Embodiment 3

[0023] A method for preparing layered cement-based composite materials, laying weak interlayer materials on a vibrating table, placing molds around the weak interlayer materials, pouring cement slurry into the mould, vibrating and flattening on the vibrating table, and using the scraper method , scrape off the excess cement slurry in the mold to obtain a single-layer composite material, remove the mold after the cement slurry reaches the initial setting, then cut the single-layer composite material into small pieces of the same size, and compound the small pieces The materials are stacked, after that, the stacked small pieces of composite materials are placed on a vibrating table to vibrate for about 5 minutes, after standing for 24 hours, the formwork is removed, and finally, put into the curing room for standard curing.

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Abstract

The invention provides a layered cement-based composite material, which is composed of a cement slurry layer and a weak interlayer which are sequentially laminated, the strength of the weak interlayer is lower than that of the cement slurry layer. The invention also discloses a preparation method which comprises the following steps: taking a die, laying one layer of weak interlayer in die, pouring the self-leveling cement slurry onto the weak interlayer, vibrating and flattening, then repeating the step 1 for at least 10 times, standing for one day and then removing the die, then performing a standard maintenance. The invention also provides another preparation method which comprises the following steps: paving a material of the weak interlayer on a vibration table, placing the die around the material of the weak interlayer, pouring the cement slurry into the die, fully vibrating on the vibration table, scrapping the redundant cement slurry from the die to obtain a single layer composite material by using a doctor blade method, removing the die after initial setting period of the cement slurry, cutting the single layer composite material into small blocks of material with same size, stacking the small blocks of composite material, wherein the stacking frequency is greater than 10 times, then placing the stacked small blocks of composite material on the vibration table for 5 minutes and performing the standard maintenance finally.

Description

Technical field: [0001] The invention relates to the field of cement-based composite materials, in particular to a layered cement-based composite material. Background technique: [0002] In recent years, with the continuous improvement of the strength of cement-based materials, the brittleness of cement-based materials has increased and the ductility has decreased. In view of the quasi-brittle characteristics of cement-based materials, at present, it is more commonly used to add various fibers to cement-based materials to improve its toughness. However, the production of various man-made fibers consumes a lot of fossil energy and is difficult to disperse in the matrix. Natural biomaterials—pearls and seashells—are also mainly composed of calcium carbonate, which is brittle in itself, but possesses high toughness, mainly due to its layered structure. Studies have shown that the toughness of layered materials is generally better. This is because the process of crack transmis...

Claims

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Application Information

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IPC IPC(8): B32B37/15B32B13/04
Inventor 万克树薛晓波
Owner SOUTHEAST UNIV
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