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Method for preparing colored autoclaved brick from lake sludge

A lake sludge and autoclaved brick technology, applied in the field of building materials, can solve the problems of no decorative function, small mixing amount, and limited application scope, etc., and achieve the effect of improving waterproofness and weather resistance.

Inactive Publication Date: 2012-05-02
WUHAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned autoclaved bricks do not have the function of decoration, which limits the scope of their application, and does not clearly take the consumption of urban lake sludge as the main goal, and the amount of admixture in building material ingredients is relatively small

Method used

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  • Method for preparing colored autoclaved brick from lake sludge
  • Method for preparing colored autoclaved brick from lake sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0023] A kind of method utilizing lake sludge to prepare colored autoclaved brick (gray imitation stone autoclaved brick), it comprises the steps:

[0024] 1) Preparation of base material: the percentage by weight of each raw material in the base material is: 45% of lake sludge, 35% of river sand, 15% of quicklime, and 5% of gypsum. The lake sludge is the dried sludge after pressure filtration, drying and roller milling, passed through 80 mesh sieve, and the water content is 5wt%. Mix the four raw materials of lake sludge, river sand, quicklime and gypsum with water (the water-solid ratio is 0.12), and then stir them to make the base layer blank, and set aside;

[0025] The lake sludge composition is Al 2 o 3 12wt%, SiO 2 53wt%, I.L (loss on ignition) 22wt%, other 13wt%. Sludge taken from Nanhu Lake, Wuhan.

[0026] 2) The preparation of the color layer blank: the addition of the gray pigment is 10wt% of the weight of the base blank, and the commercially available R15A gr...

Embodiment 2

[0034] A kind of method utilizing lake sludge to prepare colored autoclaved brick (red antique autoclaved brick), it comprises the steps:

[0035] 1) Preparation of base material: the percentage by weight of each raw material in the base material is: 40% of lake sludge, 45% of crushed stone, 12% of quicklime, and 3% of gypsum. The lake sludge is the dried sludge after pressure filtration, drying and double-roll milling, passing through an 80-mesh sieve, and having a moisture content of 4wt%. Grind the crushed stone by double rollers to make the particle size not larger than 1mm. Mix the four raw materials of lake sludge, gravel, quicklime and gypsum with water (the water-solid ratio is 0.16), and then stir them to make a base layer blank for later use;

[0036] The lake sludge composition is Al 2 o 3 12wt%, SiO 2 53wt%, I.L (loss on ignition) 22wt%, other 13wt%. Sludge taken from Nanhu Lake, Wuhan.

[0037] 2) Preparation of the color layer blank: the amount of red pigme...

Embodiment 3

[0045] A kind of method utilizing lake sludge to prepare colored autoclaved brick (green autoclaved brick), it comprises the steps:

[0046] 1) Preparation of the base material: the percentage by weight of each raw material in the base material is: 50% of lake sludge, 30% of crushed stone, 15% of quicklime, and 5% of gypsum. The lake sludge is the dried sludge after pressure filtration, drying and double-roll milling, passed through a 100-mesh sieve, and has a water content of 6wt%. Grind the crushed stone with double rollers to make the particle size not greater than 1mm (particle size ≤ 1mm). Mix the four raw materials of lake sludge, gravel, quicklime and gypsum with water (the water-solid ratio is 0.10), and then stir to make the base layer blank, and set aside;

[0047] The lake sludge composition is Al 2 o 3 12wt%, SiO 2 53wt%, I.L (loss on ignition) 22wt%, other 13wt%. Sludge taken from Nanhu Lake, Wuhan.

[0048] 2) Preparation of the color layer blank: the addit...

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Abstract

The invention relates to a method for preparing a decorative colored autoclaved brick from lake sludge as a main raw material. The method is characterized by comprising the following steps: 1) preparation of base layer blank: mixing 40-50 wt% of lake sludge, 30-50 wt% of aggregate, 8-15 wt% of quicklime and 2-5 wt% of gypsum with water, and stirring to obtain the base layer blank for later use, wherein the weight ratio of water to solid is 0.10-0.18; 2) preparation of color layer blank: adding an inorganic pigment, which accounts for 5-10 wt% of the base layer blank, into the base layer blank, and evenly stirring to obtain the color layer blank for later use; 3) slaking; 4) rolling; 5) secondary cloth pressure molding; and 6) autoclaving, and curing to obtain the colored autoclaved brick.The colored autoclaved brick prepared by the method has the function of self decoration, and is environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for preparing decorative colored autoclaved bricks with lake sludge as a main raw material. Background technique [0002] In order to improve the water quality of lakes, cities with more lakes in my country (such as Wuhan) are carrying out large-scale lake dredging projects, resulting in a large amount of lake sludge. At present, the main disposal methods of these lake sludges are burial or stacking, which is easy to cause secondary pollution to the environment and takes up valuable land resources. Therefore, the use of lake sludge to prepare building materials is an important way to consume lake sludge. [0003] Autoclaved bricks are the most widely used building materials, which can be used not only for filling walls of high-rise building frame structures, but also for load-bearing walls of brick-concrete structures. Autoclaved bricks are gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B3/00C04B28/14
Inventor 吴建锋卫信徐晓虹袁华欣倪杨魏锋华全魏波方斌正洪巍
Owner WUHAN UNIV OF TECH
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