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A high-crack-resistant and high-bending-resistant assembled board based on waste gypsum board and its preparation method

A high flexure-resistant, assembled technology, applied in the field of building materials, can solve the problems of high value-added utilization such as crack resistance and poor flexural performance, and achieve high value-added utilization, important economic and environmental benefits, and avoid land damage Effects of occupation and pollution of the environment

Active Publication Date: 2021-08-10
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 high-crack-resistant gypsum board prepared by using waste gypsum board to solve the deficiencies in the existing technology, such as the difficulty of high value-added utilization of waste gypsum board, and the poor crack resistance and flexural performance of ordinary cement-based fabricated plates. High-bending-resistant prefabricated boards, the waste gypsum boards are converted into crystal forms to prepare regenerated α-type hemihydrate gypsum powder and regenerated α-type semi-crystal whiskers, and replace them with cement and other cementitious materials to prepare high-crack-resistant Assembled plates with high flexural resistance; and the preparation method involved is simple, low in cost, and environmentally friendly, suitable for popularization and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A high-crack-resistant and high-fold-resistant assembled board based on waste gypsum boards, the preparation method of which comprises the following steps:

[0031] 1) Fully crush the waste gypsum board with a crusher, dry it in an oven at 40°C to constant weight, then fully grind the crushed gypsum board with a ball mill, pass through a 50-mesh sieve, and remove the inert components with larger particle sizes Sorting and protective paper, sorting out waste gypsum powder;

[0032] 2) a part of the waste gypsum powder of step 1) gained is mixed with calcium chloride solution (15wt%) and activator (tartaric acid, succinic acid, nano silicon dioxide, sulfuric acid in a molar ratio of 20:10:5:1 Mix and form (wherein, tartaric acid, succinic acid are analytically pure grade; Nano silicon dioxide is analytically pure, average particle diameter 37nm; The concentration of sulfuric acid is 10wt%, and its consumption is based on the introduced H 2 SO 4 ), fully mixed at a mass ...

Embodiment 2

[0037] A high-crack-resistant and high-fold-resistant assembled board based on waste gypsum boards, the preparation method of which comprises the following steps:

[0038] 1) Fully crush the waste gypsum board with a crusher, dry it in an oven at 45°C to constant weight, then use a ball mill to fully grind the broken gypsum board, pass through a 100-mesh sieve, and remove the inert components with larger particle sizes Sorting and protective paper, sorting out waste gypsum powder;

[0039] 2) a part of the waste gypsum powder in step 1) gained is mixed with calcium chloride solution (20wt%) and activator (tartaric acid, succinic acid, nano silicon dioxide, sulfuric acid by the mole of 20:13:6:1.3) than mixed (wherein, tartaric acid, succinic acid are analytically pure grades; nano silicon dioxide is analytically pure, with an average particle diameter of 37nm; the concentration of sulfuric acid is 10wt%, and its consumption is based on the H 2 SO 4 ), fully mixed according t...

Embodiment 3

[0044] A high-crack-resistant and high-fold-resistant assembled board based on waste gypsum boards, the preparation method of which comprises the following steps:

[0045] 1) Fully crush the waste gypsum board with a crusher, dry it in an oven at 43°C to constant weight, then fully grind the crushed gypsum board with a ball mill, pass through a 100-mesh sieve, and remove the inert components with larger particle sizes Sorting and protective paper, sorting out waste gypsum powder;

[0046] 2) a part of the waste gypsum powder in the step 1) gained is mixed with calcium chloride solution (17wt%) and activator (tartaric acid, succinic acid, nano silicon dioxide, sulfuric acid in a molar ratio of 20:15:7:2 Mix and form (wherein, tartaric acid, succinic acid are analytically pure grade; Nano silicon dioxide is analytically pure, average particle diameter 37nm; The concentration of sulfuric acid is 10wt%, and its consumption is based on the introduced H 2 SO 4 ), fully mixed accor...

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Abstract

The invention discloses a high-crack-resistance and high-fold-resistance assembled board based on discarded gypsum boards. The components and their parts by weight include: 75-90 parts of regenerated α-type hemihydrate gypsum powder, 75-90 parts of regenerated α-type semi-crystal 10-25 parts of beard, 5-10 parts of EPS light aggregate, 30-35 parts of water; the regenerated α-type hemihydrate gypsum powder and the regenerated α-type semi-crystal beard are respectively obtained by performing crystal transformation treatment on waste gypsum boards . In the present invention, waste gypsum boards are used as main raw materials to prepare regenerated α-type hemihydrate gypsum powder and regenerated α-type semi-crystal whiskers, and completely replace cement and other cementitious materials with the two, so as to prepare high-crack-resistant and high-bending-resistant prefabricated boards. It can provide a new idea for the preparation of low-cost, high-strength crack-resistant boards; it can also realize the high value-added utilization of waste gypsum boards, 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 high-crack-resistant and high-bending-resistant assembled board based on waste gypsum boards and a preparation method thereof. Background technique [0002] Abandoned gypsum board is a kind of construction waste produced in large quantities, which occupies a large amount of land and wastes resources, and has not yet been effectively utilized as a resource. From the perspective of the basic composition characteristics and technical principles of the material, the main material of the waste gypsum board is dihydrate gypsum, which can be converted into hemihydrate gypsum as a cementitious material after a certain process, and then the prefabricated board can be produced. However, because the dihydrate gypsum crystal form in the waste gypsum board is messy and finely divided, and the components are complex, it is difficult to realize the crystal transformatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14C04B11/26C04B11/032C04B11/024C04B20/02C04B111/34C04B18/04
CPCC04B11/024C04B11/032C04B11/262C04B20/023C04B28/146C04B2111/343C04B2201/50C04B14/383C04B16/08C04B18/0445Y02W30/91
Inventor 卢文达潘寒廖峰张磊吴世明
Owner CHINA CONSTR TECH WUHAN CO LTD
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