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Fibre cement plate with high doping quantity of fly ash

A technology of fiber cement board and fly ash, which is applied in the field of building materials, can solve the problems of shrinkage value reduction, board flexural strength reduction, board bulk density reduction, etc., and achieve the effects of optimizing performance, increasing consumption, and good social and economic benefits

Inactive Publication Date: 2010-06-16
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if a large amount of fly ash is directly added to the cement fiber board formula, it means that the cement content of the main cementitious material in the board will be greatly reduced, so the bulk density of the board will naturally decrease, and the shrinkage value will decrease, which will directly cause The flexural strength of the board is significantly reduced; therefore, there is no product and no relevant literature report on the use of high-volume fly ash in the production of cement boards.

Method used

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  • Fibre cement plate with high doping quantity of fly ash
  • Fibre cement plate with high doping quantity of fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The following method is used to prepare an economical lightweight decorative board with high fly ash content, and the specific method includes the following steps:

[0027] (1) Weigh 9kg of vinylon fiber, 3kg of pulp, and 13.5kg of fibrous sepiolite, pour it into a debonder for 10 minutes, put it into a beater, and then add 2.4kg of aluminum hydroxide, 10mm chopped glass 3kg of fiber, 15kg of silica fume, 9kg of mica, 111kg of fly ash, 9kg of residual ash from a biological power plant, 9kg of anhydrite, 116.1kg of 42.5# ordinary Portland cement and water, stirred for 15 minutes to form a slurry, and the concentration of the slurry was controlled at 10~22% (percentage of dry material / (dry material + water)).

[0028] (2) The slurry is drawn into a slab by a forming machine, and the linear pressure of the forming cylinder is controlled at 0.5-0.6 MPa.

[0029] (3) The slab is subjected to steam curing, the initial temperature entering the curing kiln is not higher than 4...

Embodiment 2～4

[0037] According to the method of Example 1, the fiber cement board was prepared with the raw materials listed in Table 2. The test results of the plates are also listed in Table 2.

[0038] Table 2 Combination of raw materials and physical and mechanical properties of fiber cement boards with different fly ash content

[0039]

[0040] The test results show that all the fiber cement boards prepared by the present invention meet the standard of medium density boards, and the strength reaches the index of Class III non-asbestos boards.

[0041]On the other hand, under the premise of meeting the standard, the amount of fly ash in the raw material of the board can be up to 40%, which can maximize the utilization of industrial waste fly ash; also, the amount of cement in the raw material of the present invention is reduced to below 50% According to a comprehensive estimate, the production cost of the present invention can be reduced by about 15% compared with similar fiber cem...

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Abstract

The invention discloses an economic type fibre cement plate with high doping quantity of fly ash and a preparation method thereof. The light fibre cement plate comprises cement, fly ash, anhydrite, polyvinylformal fibre, fibrous meerschaum, mica, pulp, micro silicon powder, glass fibre, biological power plant ember and aluminium hydroxide. A right amount of micro silicon powder and a right amount of anhydrite are added, the bending strength of a plate material can be greatly enhanced, the industrial wastes of the fly ash, the biological power plant ember and the like are doped, and the material cost can be lowered. The wet process of an asbestos-free cement flat plate is adopted, a wetted plate blank does not need to be pressurized, and the fibre cement plate has the advantages of economy, applicability, flame retardant, light weight, small contraction, environmental protection, moisture prevention and good durability after being cured by steam.

Description

technical field [0001] The invention belongs to the field of building materials, and mainly relates to the reuse of industrial waste, in particular to an economical fiber cement board with high fly ash content and a production method thereof. Background technique [0002] With the rapid development of my country's construction industry in recent years, the demand for fiber cement products is very large. Among them, fiber cement boards are also widely used as indoor and outdoor decoration materials. The current production methods of fiber cement boards mainly include molding method, copying method and The flow method, wherein the drawing method and the flow method are more suitable for industrialized large-scale production, the output is higher, and the production cost is relatively low. In the process of producing fiber cement board by the copying method, there are two different methods for forming the slab: one is the non-pressurized method, by controlling the line pressure ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04C2/26C04B28/00C04B18/08C04B16/06C04B14/38
CPCC04B2111/27C04B2111/00017C04B28/02Y02W30/91C04B14/20C04B14/303C04B14/42C04B14/4643C04B16/0641C04B18/08C04B18/101C04B18/146C04B18/241C04B22/143C04B40/024
Inventor 王志新刁桂芝
Owner CHINA BUILDING MATERIALS ACAD
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