A kind of recycled fine aggregate high-strength self-compacting concrete and its preparation method

A self-compacting concrete and recycled fine aggregate technology, applied in the field of concrete, can solve the problems of steel slag being easily corroded, oxidized, safety hazards, and concrete performance degradation, etc., achieve high strength and mechanical properties, improve crack resistance, and avoid corrosion Effect

Active Publication Date: 2021-11-19
阳新娲石商砼有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when the concrete mixed with steel slag is in an acidic, alkaline or humid environment for a long time, the steel slag in the concrete is easily corroded and oxidized, which will cause the performance of the concrete to decline in the long run, and will also bring certain safety hazards; in response to this problem, We disclose a recycled fine aggregate high-strength self-compacting concrete and its preparation method to solve this problem

Method used

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  • A kind of recycled fine aggregate high-strength self-compacting concrete and its preparation method
  • A kind of recycled fine aggregate high-strength self-compacting concrete and its preparation method

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Effect test

Embodiment 1

[0046] A method for preparing recycled fine aggregate high-strength self-compacting concrete, comprising the following steps:

[0047] (1) Prepare materials;

[0048] (2) Preparation of modified steel slag fibers:

[0049] Take petroleum ether, methyltrichlorosilane, dimethyldichlorosilane, diphenyldichlorosilane and methylhydrogendichlorosilane, cool down to 0°C in an ice-water bath, mix and stir until dissolved, and then pass in at 4°C Ammonia gas reaction, until the pH is 7, stop feeding nitrogen gas, filter with suction, distill petroleum ether under the protection of nitrogen gas, and obtain polysilazane precursor;

[0050] Take the polysilazane precursor, heat up to 140°C, add steel slag fibers, cover and impregnate for 5 hours, cool down and separate, take out the steel slag fibers and irradiate with ultraviolet light for 48 hours at a wavelength of 250nm to obtain pretreated steel slag fiber;

[0051] Take pretreated steel slag fibers, add toluene diisocyanate after...

Embodiment 2

[0059] A method for preparing recycled fine aggregate high-strength self-compacting concrete, comprising the following steps:

[0060] (1) Prepare materials;

[0061] (2) Preparation of modified steel slag fibers:

[0062] Take petroleum ether, methyltrichlorosilane, dimethyldichlorosilane, diphenyldichlorosilane and methylhydrogendichlorosilane, cool down to 0°C in an ice-water bath, mix and stir until dissolved, and then pass in at 4.5°C Ammonia gas reaction, until the pH is 7, stop feeding nitrogen gas, filter with suction, distill petroleum ether under the protection of nitrogen gas, and obtain polysilazane precursor;

[0063] Take the polysilazane precursor, heat up to 145°C, add steel slag fibers, cover and impregnate for 6 hours, cool down and separate, take out the steel slag fibers and irradiate with ultraviolet light for 49 hours at a wavelength of 253nm to obtain pretreated steel slag fiber;

[0064] Take the pretreated steel slag fiber, add toluene diisocyanate ...

Embodiment 3

[0072] A method for preparing recycled fine aggregate high-strength self-compacting concrete, comprising the following steps:

[0073] (1) Prepare materials;

[0074] (2) Preparation of modified steel slag fibers:

[0075] Take petroleum ether, methyltrichlorosilane, dimethyldichlorosilane, diphenyldichlorosilane and methylhydrogendichlorosilane, cool down to 0°C in an ice-water bath, mix and stir until dissolved, and then pass in at 5°C Ammonia gas reaction, until the pH is 7, stop feeding nitrogen gas, filter with suction, distill petroleum ether under the protection of nitrogen gas, and obtain polysilazane precursor;

[0076] Take the polysilazane precursor, heat up to 150°C, add steel slag fibers, coat and impregnate for 7 hours, cool down and separate, take out the steel slag fibers and irradiate with ultraviolet light for 50 hours at a wavelength of 255nm to obtain pretreated steel slag fiber;

[0077] Take pretreated steel slag fibers, add toluene diisocyanate after ...

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Abstract

The invention discloses a recycled fine aggregate high-strength self-compacting concrete and a preparation method thereof. The raw materials of each component of the concrete include: by weight, 40-50 parts of modified steel slag fibers, 10-20 parts of modified polyurethane, modified 10-20 parts of permanent epoxy resin, 160-170 parts of cement, 250-300 parts of coarse aggregate, 180-200 parts of recycled fine aggregate, 70-80 parts of water; the coarse aggregate includes natural coarse aggregate and recycled Coarse aggregate, the natural coarse aggregate is a mixture of crushed stone and river sand, and the regenerated coarse aggregate is a mixture of slag, crushed stone, discarded ceramics, and construction solid waste; the application discloses a recycled fine aggregate with high strength The preparation method of self-compacting concrete, the prepared concrete has high strength and excellent mechanical properties, and the concrete can avoid the corrosion of steel slag fibers, and has excellent corrosion resistance as a whole, and can be applied to extreme environments such as acid and alkali, and is practical Sex is higher.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a recycled fine aggregate high-strength self-compacting concrete and a preparation method thereof. Background technique [0002] Concrete refers to the artificial stone made of cement as the main cementitious material, mixed with water, sand, stones, chemical admixtures and mineral admixtures when necessary, mixed in appropriate proportions, uniformly stirred, compacted and cured. Concrete is mainly divided into two stages and states: the plastic state before setting and hardening, that is, fresh concrete or concrete mixture; the hard state after hardening, that is, hardened concrete or concrete. [0003] Nowadays, with the development and progress of science and technology, energy conservation and environmental protection have become one of the main contents we advocate. With the progress of my country's steelmaking industry, a large amount of steel slag will be discharged ever...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B20/10C04B24/28C08G18/66C08G18/48C08G18/34C08G18/75C04B14/48C04B111/20C04B111/23C04B111/26
CPCC04B20/1051C04B20/1055C04B24/282C04B28/00C04B2111/20C04B2111/23C04B2111/26C04B2201/50C08G18/348C08G18/4825C08G18/6692C08G18/755C04B14/48C04B24/281C04B24/42C04B14/06C04B14/02C04B14/068C04B18/10C04B18/165C04B18/16
Inventor 不公告发明人
Owner 阳新娲石商砼有限公司
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