Recycled fine aggregate high-strength self-compacting concrete and preparation method thereof

A technology of self-compacting concrete and recycled fine aggregate, which is applied in the field of concrete, can solve the problems of steel slag being easily corroded, oxidized, hidden safety hazards, and concrete performance degradation, and achieve high practicability, increase in compressive strength, and increase in concrete strength. Effect

Active Publication Date: 2021-01-26
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 concre

Method used

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  • Recycled fine aggregate high-strength self-compacting concrete and preparation method thereof
  • Recycled fine aggregate high-strength self-compacting concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
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 recycled fine aggregate high-strength self-compacting concrete and a preparation method thereof. The concrete is prepared from, by weight, 40-50 parts of modified steel slag fiber, 10-20 parts of modified polyurethane, 10-20 parts of modified epoxy resin, 160-170 parts of cement, 250-300 parts of coarse aggregate, 180-200 parts of recycled fine aggregate and 70-80 parts ofwater, wherein the coarse aggregate comprises natural coarse aggregate and recycled coarse aggregate, the natural coarse aggregate is a mixture of broken stone and river sand, and the recycled coarseaggregate is a mixture of slag, broken stone, waste ceramic and building solid waste. The invention discloses a preparation method of the recycled fine aggregate high-strength self-compacting concrete, the prepared concrete is high in strength and excellent in mechanical property, steel slag fibers can be prevented from being corroded by the concrete, and the whole concrete has excellent corrosionresistance, can be applied to extreme environments such as acidic and alkaline environments and is high in practicability.

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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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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