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Additive capable of improving adsorption capacity of concrete to PM2.5, and preparation method and application thereof

A technology of concrete and additives, applied in the field of additives, can solve the problems of PM2.5 adsorption effect is not very ideal, the adsorption effect is not very ideal, the impact of concrete strength, etc., to improve the anti-segregation ability, prolong the hydration time, adsorption effectiveness prolonged effect

Active Publication Date: 2019-11-08
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this invention endows concrete with certain adsorption properties, it is not very specific, and its preparation process is cumbersome and expensive.
There are also some studies that mix materials such as ceramsite, clay, and polymers into concrete to improve the adsorption of concrete. However, the adsorption effect of such additives is not very ideal, and it has a certain impact on the strength of concrete. Sex is also under study
In short, the use of concrete adsorption to remove PM2.5 in the atmosphere is relatively rare. The existing additives do not have a very satisfactory adsorption effect on PM2.5, and they also have a certain impact on the strength of concrete.

Method used

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  • Additive capable of improving adsorption capacity of concrete to PM2.5, and preparation method and application thereof
  • Additive capable of improving adsorption capacity of concrete to PM2.5, and preparation method and application thereof
  • Additive capable of improving adsorption capacity of concrete to PM2.5, and preparation method and application thereof

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preparation example Construction

[0043] The embodiment of the present invention also proposes a preparation method of an additive to improve the ability of concrete to absorb PM2.5, which specifically includes the following steps: organically modified bentonite 25%-55%, silica fume 10%-50%, hydrotalcite powder 15% %-35% and polyether modified polysiloxane 0.1%-0.3%, mixed evenly, and ground until the specific surface area of ​​the powder is greater than 400m 2 / kg, to obtain an additive that can effectively improve the ability of concrete to absorb PM2.5.

[0044] As a preferred embodiment, 35%-45% of organic modified bentonite, 20%-40% of silica fume, 20%-30% of hydrotalcite powder and 0.15%-0.25% of polyether modified polysiloxane.

[0045] The embodiment of the present invention also proposes a concrete composition, which includes concrete and the above-mentioned additive for improving the ability of the concrete to absorb PM2.5, and the dosage of the additive is 5%-20% of the total mass of the concrete. ...

Embodiment 1

[0052] An additive to improve the ability of concrete to absorb PM2.5. The components and mass percentages are as follows: 40% chitosan modified bentonite, and the specific surface area is 465m 2 / kg, the content of montmorillonite is 92%; silica fume is 39.8%, the sieve rate of 45μm square hole sieve is ≤2%, and the specific surface area is about 21m 2 / g; hydrotalcite powder 20%, whiteness 93%, average particle size 0.8 μm; polyether modified polysiloxane 0.2%.

[0053] The preparation method of the additive is as follows: uniformly mix organically modified bentonite, silica fume, hydrotalcite powder and polyether modified polysiloxane, put them into a grinder, and grind until the specific surface area of ​​the powder is greater than 400m 2 / kg, bagged and sealed.

[0054] The additive can be applied to concrete to improve the ability of concrete to absorb PM2.5. The following concrete is taken as an example to illustrate the effect of the additive of the present invention...

Embodiment 2

[0064] An additive to improve the ability of concrete to absorb PM2.5, the components and mass percentages are as follows: chitosan modified bentonite 35%, specific surface area 475m 2 / kg, the content of montmorillonite is 94%; silica fume is 34.75%, the sieve rate of 45μm square hole sieve is ≤1%, and the specific surface area is about 22m 2 / g; hydrotalcite powder 30%, whiteness 91%, average particle size 0.6 μm; polyether modified polysiloxane 0.25%.

[0065] The preparation method of the additive is as follows: uniformly mix organically modified bentonite, silica fume, hydrotalcite powder and polyether modified polysiloxane, put them into a grinder, and grind until the specific surface area of ​​the powder is greater than 400m 2 / kg, bagged and sealed.

[0066] The additive can be applied to concrete to improve the ability of concrete to absorb PM2.5. The following concrete is taken as an example to illustrate the effect of the additive of the present invention.

[006...

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Abstract

The invention relates to an additive capable of improving the adsorption capacity of concrete to PM2.5, and a preparation method and an application thereof. The additive is prepared from the followingcomponents in percentages by mass: 25% to 55% of organic modified bentonite, 10% to 50% of silica fume, 15% to 35% of hydrotalcite powder and 0.1% to 0.3% of polyether modified polysiloxane. The preparation method provided by the invention comprises the following steps: uniformly mixing the above-mentioned raw materials, then placing an obtained mixture into a grinding machine, and carrying out grinding until the specific surface area of a powder reaches 400 m2 / kg or more so as to obtain the additive. When the additive obtained by using the preparation method provided by the invention is usedin concrete, the addition amount of the additive accounts for 5% to 20% of the total mass of a concrete cementing material. The additive provided by the invention adopts an inorganic salt mineral asa main raw material, can improve the adsorption capacity of the concrete to the PM2.5 when being applied in the concrete, can compensate the strength loss of the concrete through hydration of mineralcomponents in the additive, prolongs the hydration time of the concrete, and extends the adsorption effectiveness of the concrete.

Description

technical field [0001] The invention relates to the technical field of additives, in particular to an additive for improving the ability of concrete to absorb PM2.5 and its preparation method and application. Background technique [0002] Particulate matter with an aerodynamic diameter of less than 2.5 μm is called fine particles, also known as PM2.5, which is an important air pollutant. This type of particulate matter has a high degree of stability in the atmosphere, a slow settling speed, and a high probability of being inhaled into the respiratory tract. Compared with coarse particles, its specific surface area is large, and it can carry more toxic and harmful substances into the bronchiole and alveolar area, which is harmful to the human body. more harmful. The anions in PM2.5 particulate matter are mainly sulfate, nitrate, and halide ions; the cations are mainly ammonium salts, alkali metals, and alkaline earth metal ions. Considering that concrete is the main compone...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B28/04
CPCC04B28/04C04B40/0039C04B2111/00017C04B2111/00025C04B14/104C04B18/146C04B14/042C04B24/42C04B18/08C04B18/12C04B14/06C04B14/02
Inventor 姚燕濮琦
Owner CHINA BUILDING MATERIALS ACAD
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