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Light high-strength fabricated board based on waste gypsum board and preparation method thereof

A prefabricated and gypsum board technology, which is applied in the field of building materials, can solve the problems of high value-added utilization of light-weight and high-strength prefabricated boards and high production costs, and achieve the effect of improving later strength, improving lightness and reducing bulk density

Active Publication Date: 2020-10-02
CHINA CONSTR TECH WUHAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a light-weight, high-strength assembled board based on waste gypsum board for the deficiencies in existing technologies such as the difficulty of high value-added utilization of waste gypsum boards and the high cost of manufacturing light-weight and high-strength assembled boards. The gypsum board is treated with activation pretreatment and crystal transformation, and a large proportion of cement is replaced to prepare a light-weight and high-strength assembly board; and the preparation method involved is simple, low-cost, and environmentally friendly, which is suitable for popularization and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A light-weight and high-strength assembled board based on waste gypsum boards, the preparation method of which comprises the following steps:

[0029] 1) Fully crush the waste gypsum board with a crusher, then fully grind the crushed gypsum board with a ball mill, pass through a 100-mesh sieve, remove the inert components with larger particle sizes and the protective paper, and sort out the effective group points (waste gypsum powder);

[0030] 2) Step 1) gained waste gypsum powder is mixed with calcium chloride solution (20wt%) and activator (citric acid, nano-titanium dioxide, sulfuric acid in a molar ratio of 20:5:1 (wherein citric acid is analytically pure grade; nano-titanium dioxide is analytically pure, with an average particle diameter of 24nm; the concentration of sulfuric acid is 10wt%, and its dosage is based on the introduced H 2 SO 4 ), fully mixed according to the mass ratio of 1:3:0.02%, and then left to stand at room temperature (24h; the temperature i...

Embodiment 2

[0035] A light-weight and high-strength assembled board based on waste gypsum boards, the preparation method of which comprises the following steps:

[0036] 1) Fully crush the waste gypsum board with a crusher, and then fully grind the crushed gypsum board with a ball mill, pass through a 150-mesh sieve, remove the inert components with larger particle sizes and the protective paper, and sort out the effective group Minute;

[0037] 2) The waste gypsum powder obtained in step 1) is mixed with calcium chloride solution (30wt%) and an activator (citric acid, nano-titanium dioxide and sulfuric acid in a molar ratio of 20:7:1.5 (wherein citric acid is analytically pure grade; nano-titanium dioxide is analytically pure, with an average particle diameter of 24nm; the concentration of sulfuric acid is 10wt%, and its dosage is based on the introduced H 2 SO 4 According to the mass ratio of 1:5:0.1%, fully mixed, and then left at room temperature (35h; temperature is 30 ℃), to get w...

Embodiment 3

[0042] A light-weight and high-strength assembled board based on waste gypsum boards, the preparation method of which comprises the following steps:

[0043] 1) Fully crush the waste gypsum board with a crusher, then fully grind the crushed gypsum board with a ball mill, pass through a 200-mesh sieve, remove the inert components with larger particle sizes and the protective paper, and sort out the effective group Minute;

[0044] 2) The waste gypsum powder obtained in step 1) is mixed with calcium chloride solution (40wt%) and an activator (citric acid, nano-titanium dioxide and sulfuric acid in a molar ratio of 20:10:2 (wherein citric acid is analytically pure grade; nano-titanium dioxide is analytically pure, with an average particle diameter of 24nm; the concentration of sulfuric acid is 10wt%, and its dosage is based on the introduced H 2 SO 4 ), fully mixed according to the mass ratio of 1:8:0.15%, and then left to stand at room temperature (48h; temperature is 20°C), t...

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Abstract

The invention discloses a light-weight high-strength fabricated board based on a waste gypsum board. The light-weight high-strength fabricated board comprises the following components in parts by weight: 100 parts of regenerated alpha-type semi-hydrated gypsum powder, 20-30 parts of fly ash, 5-10 parts of cement, 8-15 parts of EPS light aggregate and 50-55 parts of water. The regenerated alpha-type semi-hydrated gypsum powder is formed by performing activation pretreatment and secondary crystal form conversion treatment on waste gypsum boards. The regenerated alpha-type semi-hydrated gypsum powder obtained by the invention has the characteristics of low standard thickening water demand and high strength, and can be matched with fly ash and cement to further improve the later strength of ahardened body, so as to prepare an assembled plate which can effectively consider the advantages of light weight, high strength and low cost; and the related preparation method is simple, can realizehigh-added-value utilization of the waste gypsum board, and has important economic and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a light-weight and high-strength assembled board based on waste gypsum boards and a preparation method thereof. Background technique [0002] Abandoned gypsum board is a common construction waste, which occupies a large amount of land and wastes resources, and has not yet been effectively utilized. From the perspective of the basic composition characteristics and technical principles of the material, the main material in the waste gypsum board is dihydrate gypsum, which can be converted into hemihydrate gypsum as a cementitious material after a certain process, and then produce prefabricated boards. However, due to the waste gypsum board The crystal form of the dihydrate gypsum in the dihydrate gypsum is messy and finely divided, and the components are complex. It is very difficult to realize the crystal transformation in a directional and controllable mann...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B11/26C04B16/08C04B111/40
CPCC04B11/262C04B16/08C04B28/146C04B2111/40C04B2201/50C04B18/08C04B7/02
Inventor 卢文达潘寒廖峰张磊吴世明
Owner CHINA CONSTR TECH WUHAN CO LTD
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