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A functional porous cement-based composite material and its preparation method

A composite material and cement-based technology, applied in the field of material science and engineering, can solve the problems of difficult large-scale application and high cost of ceramic membranes, and achieve the effects of easy acquisition, low cost and simple preparation process

Inactive Publication Date: 2016-06-29
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Titanium dioxide inorganic composite membranes have excellent chemical stability and remarkable photocatalytic and separation effects, but due to the high cost of ceramic membranes, it is difficult to achieve large-scale applications
At present, there are no reports and patents related to the porous cement-based material doped with titanium dioxide / graphene oxide.

Method used

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  • A functional porous cement-based composite material and its preparation method
  • A functional porous cement-based composite material and its preparation method
  • A functional porous cement-based composite material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation method of functional porous cement-based composite material is as follows:

[0037] 1) Preparation of graphite oxide: Weigh 5g of graphite and 5g of sodium nitrate and place them in a three-necked flask containing 160mL of 98wt% concentrated sulfuric acid, stir and react at constant temperature in an ice bath for 1h, then continue to gradually add 23g of potassium permanganate (note that Keep the temperature), and continue to stir for 2 hours, then place at room temperature for a week, then dilute with 500 mL of 5% sulfuric acid solution (note that the temperature will rise rapidly), stir for 2 hours, and finally add 15 mL of 30% hydrogen peroxide to reduce the remaining potassium permanganate for 2 hours. After repeated washing and centrifugation, the graphite oxide is obtained by vacuum drying until it is neutral.

[0038] 2) Preparation of titanium dioxide colloidal suspension solution: firstly, 100 mL of tetrabutyl titanate and 25 mL of acetylacetone...

Embodiment 2

[0043] Preparation of undoped porous cementitious composites:

[0044] 1) Preparation of cement composite slurry: Weigh 350g of water, 700g of cement, and 600g of ceramsite (particle size after pulverization: 0.5-5mm), mix them, and add them to a mixer to stir for 3 minutes to obtain a cement composite slurry.

[0045] 2) Forming and maintenance of porous cement-based composite materials: After injecting the cement composite slurry in the above 1) into the mold (150 × 150 × 150 mm), flattening and vibrating, in order to facilitate the algae separation test, especially in the center of the upper surface. Press out a small pit with a depth of about 2cm, and release it after 24 hours. The demolded samples were placed in the laboratory for 28 days under natural conditions to obtain undoped porous cement-based composites.

Embodiment 3

[0047] The preparation method of functional porous cement-based composite material is as follows:

[0048] 1) Preparation of graphite oxide solution: Weigh 5g of graphite flakes and 5g of sodium nitrate and place them in a three-necked flask containing 160mL of 98% concentrated sulfuric acid, stir and react at constant temperature in an ice bath for 1h, then continue to gradually add 23g of potassium permanganate slowly , and kept stirring at room temperature for 2 hours, then placed at room temperature for a week, then diluted with 500 mL of 5% sulfuric acid solution, stirred for 2 hours, and finally added 15 mL of 30% hydrogen peroxide to reduce the remaining potassium permanganate for 2 hours. After repeated washing and centrifugation, the graphite oxide is obtained by vacuum drying until it is neutral.

[0049] 2) Preparation of titanium dioxide colloidal suspension solution: firstly, 20 mL of tetrabutyl titanate and 5 mL of acetylacetone were dissolved in 40 mL of absolut...

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Abstract

The invention belongs to the technical field of material science and engineering and particularly relates to a functional porous cement based composite material and a preparation method thereof. The composite material is prepared from the following raw materials: cement, aggregates, water, additives and a catalyst in a ratio of (1-1.2):(0.5-0.6): (0.2-0.8):(0-0.04):(0-0.2), wherein the content of the catalyst is not zero and the catalyst is a compound of titanium dioxide and graphene oxide. The invention provides the functional porous cement based composite material which not only has a separating function, but also has the characteristics of being photocatalytic, pollution-resistant and self-cleaning. The functional porous cement based composite material is simple in preparation process and low in cost and has wide application prospect in the technical industry of environmental protection and management.

Description

technical field [0001] The invention belongs to the technical field of material science and engineering, and particularly relates to a functional porous cement-based composite material and a preparation method thereof. Background technique [0002] Porous cement-based composites are commonly used construction materials. When used as a wall filling material, it has the functions of heat preservation and heat insulation; when used as a pavement material, it has good drainage, anti-skid and noise reduction properties. However, most of the research and application of this focus on the correlation between mechanical properties, thermal properties, durability and its composition and pore structure. It may also be because the internal pores are closed and disconnected, so they are rarely made into porous separation materials. research and applications. [0003] Photocatalytic oxidation is a new type of pollution-free treatment technology, which can completely oxidize and decompos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B28/00
CPCC04B28/02C04B2111/2061
Inventor 祝瑜张召才
Owner HENAN POLYTECHNIC UNIV
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