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Hydrophobic foam concrete and preparation method thereof

A foam concrete and hydrophobic technology, applied in the field of concrete, can solve problems such as low strength, easy cracking, absorption, etc., and achieve high practicability, increased strength, and excellent mechanical properties

Inactive Publication Date: 2020-06-26
卢加贵
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to its own structural characteristics, most of the existing foam concrete has problems such as low strength, easy cracking, and absorption, which limit its use to a certain extent, especially the water absorption of foam concrete, which brings us great inconvenience.

Method used

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  • Hydrophobic foam concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] S1: Prepare materials:

[0052] Weigh cement, phosphorus slag powder, fly ash, phosphogypsum, water reducer, dibutyltin dilaurate, hydroxyl-terminated silicone oil and foaming agent; weigh tetraethyl orthosilicate, absolute ethanol, n-hexane, Base disilazane, aluminum silicate fiber, silane coupling agent, maleic anhydride, graphene oxide and surfactant, standby;

[0053] S2: Preparation of modified gel:

[0054] Take tetraethyl orthosilicate and absolute ethanol, mix and stir for 20 minutes, then add oxalic acid solution, continue to stir for 60 minutes, let stand for 12 hours, then add ammonia solution, continue to stir, stand to form gel A;

[0055] Take gel A, put it in an oven at 50°C for 1.2 hours, and then soak it in absolute ethanol at a temperature of 50°C for 28 hours. Methyldisilazane was modified for 24 hours to obtain gel B;

[0056] Take gel B, wash it with n-hexane for 20 hours, raise the temperature to 50°C, dry at constant temperature for 4.2 hours, ...

Embodiment 2

[0067] S1: Prepare materials:

[0068] Weigh cement, phosphorus slag powder, fly ash, phosphogypsum, water reducer, dibutyltin dilaurate, hydroxyl-terminated silicone oil and foaming agent; weigh tetraethyl orthosilicate, absolute ethanol, n-hexane, Base disilazane, aluminum silicate fiber, silane coupling agent, maleic anhydride, graphene oxide and surfactant, standby;

[0069] S2: Preparation of modified gel:

[0070] Take tetraethyl orthosilicate and absolute ethanol, mix and stir for 25 minutes, then add oxalic acid solution, continue to stir for 62 minutes, let stand for 20 hours, then add ammonia solution, continue to stir, stand to form gel A;

[0071] Take gel A, put it in an oven at 53°C for 1.1h, and then soak it in absolute ethanol at a temperature of 52°C for 26h, then put it in an oven at 53°C, rinse it with n-hexane for 25h, and then add six Methyldisilazane was modified for 26 hours to obtain gel B;

[0072] Take gel B, wash it with n-hexane for 22 hours, rai...

Embodiment 3

[0083] S1: Prepare materials:

[0084] Weigh cement, phosphorus slag powder, fly ash, phosphogypsum, water reducer, dibutyltin dilaurate, hydroxyl-terminated silicone oil and foaming agent; weigh tetraethyl orthosilicate, absolute ethanol, n-hexane, Base disilazane, aluminum silicate fiber, silane coupling agent, maleic anhydride, graphene oxide and surfactant, standby;

[0085] S2: Preparation of modified gel:

[0086] Take tetraethyl orthosilicate and absolute ethanol, mix and stir for 30 minutes, then add oxalic acid solution, continue to stir for 65 minutes, let stand for 28 hours, then add ammonia solution, continue to stir, stand to form gel A;

[0087] Take gel A, put it in an oven at 55°C to age for 1 hour, and then soak it in absolute ethanol at a temperature of 55°C for 24 hours, then put it in an oven at 55°C, rinse it with n-hexane for 24 hours, and then add Hexa Modification treatment with base disilazane, the modification treatment time is 28h, and gel B is obt...

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Abstract

The invention discloses hydrophobic foam concrete and a preparation method thereof. The concrete comprises cement, phosphorus slag powder, fly ash, phosphogypsum, modified gel and other components, wherein both the phosphorus slag powder and the fly ash contain a large amount of vitreous bodies and have high pozzolanic activity; the phosphorus slag powder, the fly ash and the phosphogypsum have density smaller than the density of the cement and can replace part of the cement to reduce mass of the concrete and facilitate lightening of the concrete; the particle distribution of each component isdifferent, and the particles with different gradations are beneficial to the increase of the compactness of the concrete. The process is reasonable in design and simple to operate. In the technical scheme, the silicon dioxide aerogel is optimized and modified to prepare the modified hydrophobic silica gel, then a fiber compound is added, the strength of the foam concrete is improved, finally, a surfactant is prepared to conduct surface treatment on the concrete, and the prepared foam concrete is excellent in hydrophobic property, excellent in mechanical property and high in practicability.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a hydrophobic foam concrete and a preparation method thereof. Background technique [0002] Cellular concrete, also known as foam concrete, is a special variety of air-entrained concrete. Its pore structure and material properties are close to that of air-entrained concrete. The difference between the two is only in the shape of the pores and the means of air-entrainment. [0003] Air-entrained concrete pores are generally elliptical, and use chemical gas generation. Through chemical reactions, internal gas is generated to form pores; air-entrained concrete is deformed under the influence of capillary pores to form polyhedrons, and the foaming is usually mechanically formed. It is made by preparing a foam from an aqueous solution of an agent, and then uniformly stirring the prepared foam and a slurry made of a silicon-calcium material, a magnesite material or a gypsum material, ...

Claims

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Application Information

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IPC IPC(8): C04B28/14C04B38/02C04B111/27
CPCC04B28/143C04B2111/27C04B7/00C04B18/145C04B18/08C04B14/064C04B14/4656C04B14/024C04B2103/302C04B24/42C04B2103/0068C04B38/02
Inventor 卢加贵
Owner 卢加贵
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