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Preparation method and application of carbon excited steel slag water-permeable eco-concrete

A technology of ecological concrete and steel slag, applied in the field of ecological permeable concrete, can solve the problems of cracking or spalling, poor stability, no engineering application, etc., achieve good biocompatibility, protect urban soil and water environment, and good economic benefits Effect

Inactive Publication Date: 2018-03-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since steel slag contains a considerable amount of f-CaO, its stability is poor, and it is easy to crack or peel off when it is directly used in aggregate
The excitation of steel slag by carbonization is relatively weak for large-volume or dense concrete mortar, and the steel slag inside the structure cannot be combined with CO 2 Therefore, there is no report of engineering application of this type of material at present.

Method used

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  • Preparation method and application of carbon excited steel slag water-permeable eco-concrete
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  • Preparation method and application of carbon excited steel slag water-permeable eco-concrete

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Embodiment 1

[0036] This embodiment provides a carbon-inspired steel slag permeable concrete preparation process, taking the configuration of 1 cubic meter of steel slag permeable concrete as an example, which includes the following steps:

[0037] 1) Dry the 0-5mm steel slag particles and grind them into powder through a ball mill, and measure them according to the Blaine method in the national standard "Measurement Method of Cement Specific Surface Area" (GB / T8074-2008) to obtain the Blaine specific surface area 260~460m 2 / kg of steel slag powder.

[0038] 2) Mix 240kg of steel slag powder obtained in step 1, 1805kg of steel slag particles with a particle size of 19 to 9.5mm, and 95kg of steel slag particles with a particle size of ≤4.75mm, mix them in a concrete molding machine for 1 minute, then add 72kg of water and stir for 3 minutes After forming, the steel slag permeable concrete can be obtained.

[0039] 3) Curing: The steel slag permeable concrete obtained in step 2 is cured at ...

Embodiment 2

[0044] This embodiment provides a carbon-inspired steel slag permeable concrete preparation process, which includes the following steps:

[0045] 1) Dry the 0-5mm steel slag particles and grind them into powder through a ball mill to obtain a specific surface area of ​​260-460m 2 / kg of steel slag powder.

[0046] 2) Mix 90kg of steel slag powder obtained in step 1, 1610kg of steel slag particles with a particle size of 53-26.5mm, and 90kg of steel slag particles with a particle size of ≤4.75mm, and then stir in the concrete molding machine for 1 minute, then add 36kg of water and stir for 3 minutes After forming, the steel slag permeable concrete can be obtained.

[0047] 3) Curing: The steel slag permeable concrete obtained in step 2 is cured at room temperature for 24 hours and then placed in a carbonization box or carbonation reactor for curing. The temperature in the carbonation box is controlled at 20±2°C, CO 2 The volume ratio concentration is 20±2%, where CO 2 The p...

Embodiment 3

[0050] This embodiment provides a carbon-inspired steel slag permeable concrete preparation process, which includes the following steps:

[0051] 1) Dry the 0-5mm steel slag particles and grind them into powder through a ball mill to obtain a specific surface area of ​​260-460m 2 / kg of steel slag powder.

[0052] 2) Mix 156kg of steel slag powder obtained in step 1, 72kg of phosphorus slag powder, 12kg of manganese slag powder, 1805kg of steel slag particles with a particle size of 26.5-13.2mm, and 95kg of steel slag particles with a particle size of ≤4.75mm, and then stir in the concrete forming machine 1 minute, then add 72kg of water and stir for 3 minutes to form, and then steel slag permeable concrete can be obtained.

[0053] 3) Curing: The steel slag permeable concrete obtained in step 2 is cured at room temperature for 24 hours and then placed in a carbonization box or carbonation reactor for curing. The temperature in the carbonation box is controlled at 20±2°C, CO ...

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Abstract

The invention discloses carbon excited steel slag water-permeable eco-concrete and a preparation method and application thereof. The eco-concrete comprises steel slag powder, steel slag coarse particles, steel slag fine particles and water, specific surface area of the steel slag powder is 260-460m2 / kg, particle size of the steel slag coarse particles is 2.36-53mm, and particle size of the steel slag fine particles is smaller than or equal to 4.75mm. The preparation method includes: mixing the steel slag powder, the steel slag coarse particles, the steel slag fine particles and the water to form a water-permeable product blank; forming a high-strength water-permeable product in a high-partial-pressure CO2 environment. Gravel and cement are not needed, each cubic meter of the steel slag water-permeable concrete can absorb more than 100kg of CO2, and steel slag can be utilized massively, so that atmospheric pollution and soil pollution caused by discharging of a lot of steel slag each year in China can be relieved; the product is completely composed of waste, so that tax exemption can be realized; CO2 emission can be absorbed, and income is acquired through carbon emission transactions; a core material is provided for sponge city planning; soil and water environment of cities are protected. The eco-concrete is a waste-recycling low-carbon eco-material with good using performance.

Description

technical field [0001] The invention relates to the application field of building materials and solid waste, in particular to a formula and a preparation process for preparing ecological permeable concrete with steel slag as the main component by adopting a carbon excitation method. Background technique [0002] my country's steel production ranks first in the world (accounting for about 50% of the world). In 2014, the steel slag production was about 125 million tons, and the current comprehensive utilization rate is less than 15%. The way to expand the comprehensive utilization of steel slag is to increase the comprehensive utilization rate of steel slag. sustainable development is of great significance. The dense and impermeable building materials in modern cities cut off the connection between rainwater and natural ecology, which has led to the increasingly prominent urban heat island effect in my country and the increasingly serious situation of "seeing the sea". On April...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B28/08C04B40/02
Inventor 沈卫国张武宗陈丹霞邢琳杨九香王文聪陶子豪陈祖毅易卉刘燚刘安琪
Owner WUHAN UNIV OF TECH