CN116253547A - Low-carbon high-strength regenerated ECC (error correction code) and preparation method thereof - Google Patents

Low-carbon high-strength regenerated ECC (error correction code) and preparation method thereof Download PDF

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CN116253547A
CN116253547A CN202310034809.5A CN202310034809A CN116253547A CN 116253547 A CN116253547 A CN 116253547A CN 202310034809 A CN202310034809 A CN 202310034809A CN 116253547 A CN116253547 A CN 116253547A
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low
suspension
ecc
carbon
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黄婷
黄柏蜻
郝全琴
邢菲
周志铖
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Guilin University of Technology
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Guilin University of Technology
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/26—Carbonates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/08—Flue dust, i.e. fly ash
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/16—Waste materials; Refuse from building or ceramic industry
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Civil Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention discloses a low-carbon high-strength regenerated ECC and a preparation method thereof, and relates to the technical fields of resource recycling and building materials. The raw materials of the low-carbon high-strength regenerated ECC comprise, by mass, 11-30 parts of cement, 9-45 parts of fly ash, 9-30 parts of waste concrete micro-powder, 5-30 parts of suspension, 0.1-1 part of water reducer, 0.2-2 parts of consistency regulator and 0.5-3 parts of fiber; the suspension is prepared by introducing carbon dioxide gas into magnesium hydroxide suspension to carry out carbonization reaction. The method has simple process steps and is easy to operate; the invention utilizes the waste concrete micro-powder and carbon dioxide mineralization technology, reduces the consumption of cement and reduces the carbon footprint; the prepared recycled ECC concrete retains high tensile ductility and strict crack control and is high in strength.

Description

Low-carbon high-strength regenerated ECC (error correction code) and preparation method thereof
Technical Field
The invention relates to the technical field of resource recycling and building materials, in particular to a low-carbon high-strength regenerated ECC and a preparation method thereof.
Background
Among the building materials, concrete is the most used material, whose yield is inferior to water, and is the second largest man-made material worldwide. Mass production of concrete, however, results in a large amount of carbon dioxide emissions, exacerbating the greenhouse effect. The reduction of carbon emission generated in the concrete production process can promote green development, accelerate green transformation of development modes and realize sustainable development.
ECC concrete is a fiber reinforced cement-based composite material with high ductility and strict crack width control. The material is mainly applied to projects such as bridge decks, building shock absorption, retaining walls, irrigation channels and the like. The ECC concrete has the main characteristics that the aggregate proportion is small and the particle size of the aggregate is also small, so that the ECC cement is large in dosage and large in environmental load.
However, with the rapid development of the construction industry, not only a large amount of carbon dioxide is generated, but also a large amount of waste concrete is generated during the process of demolishing the building, and the environment is seriously polluted. If the recycled high-strength ECC is prepared from the waste concrete as a green building material, the win-win of building industry development and environmental protection can be realized. At present, research on recycled concrete has achieved a certain result, and a small amount of waste concrete is utilized to produce recycled aggregate, which is used for producing building materials such as concrete and the like, so as to promote sustainable development. However, recycled aggregate contains a large number of holes and micro-cracks, has stronger water absorption and relatively lower strength, and therefore, the recycled waste concrete has not been used in large scale in the construction engineering.
Reducing the carbon footprint can sequester carbon dioxide in addition to reducing carbon dioxide emissions by reducing energy consumption. Currently, carbon dioxide capture and sequestration technology (CCUS) is one of the four world-recognized energy conversion pillars. The carbon dioxide mineralization curing concrete technology is widely regarded as a most potential utilization technical route in developing countries, and the technical principle is that carbon dioxide discharged from industry is added into the production of concrete, and forms mineralization reaction with calcium and magnesium and the like to be converted into minerals so as to harden the concrete. The process can realize carbon fixation without the need of high temperature environment generated by fire coal. The technology can realize the improvement of the strength and the durability of the concrete through filling effect, interface transition zone elimination effect, product layer effect and the like. The method is applied to the recycled concrete, not only can seal carbon dioxide, but also can improve the strength of the recycled concrete. However, the carbon dioxide curing concrete technology is affected by a plurality of factors (such as relative humidity, carbon dioxide concentration, curing time, curing temperature, etc.), resulting in low overall mineralization efficiency.
Disclosure of Invention
Based on the above, the invention provides a low-carbon high-strength recycled ECC and a preparation method thereof, wherein the waste concrete fine powder is used for replacing part of cement cementing materials, and meanwhile, the carbon dioxide mineralization is used for improving the compactness and strength of a matrix, so that the carbon footprint of the ECC is further reduced, and the low-carbon recycled ECC concrete with high compressive strength and high tensile ductility is prepared.
In order to achieve the above object, the present invention provides the following solutions:
according to one of the technical schemes, the low-carbon high-strength regenerated ECC comprises, by mass, 11-30 parts of cement, 9-45 parts of fly ash, 9-30 parts of waste concrete micro-powder, 5-30 parts of suspension, 0.1-1 part of water reducer, 0.2-2 parts of consistency regulator and 0.5-3 parts of fiber.
The suspension is prepared by introducing carbon dioxide gas into magnesium hydroxide suspension to carry out carbonization reaction.
Among the above raw materials, the proportion of the waste concrete fine powder to the powder raw material is not more than 45%, otherwise, the strength loss of regenerated ECC is larger; under the common condition, the ECC water-cement ratio is not more than 0.3, and the strength of the concrete is affected by the excessive water-cement ratio; the mixing amount of the fibers is controlled to be about 2%, the fibers are agglomerated due to the too high mixing amount, so that the workability of the ECC concrete is reduced, the weak interface between the fibers and the matrix is increased, and no obvious ductility is achieved due to the too low mixing amount.
Further, the cement is ordinary Portland cement 42.5; the fly ash is class-F class-I low-calcium fly ash, the screen residue of 45 mu m is not more than 12%, and the water demand ratio is not more than 95%.
The F-class fly ash has strong capability of reducing hydration heat, can effectively prevent carbide from decomposing, has finer I-class fly ash particles and large activity, and can improve the later strength of ECC concrete.
Further, the fiber is one or more of polyvinyl alcohol fiber, polypropylene fiber and polyethylene fiber, the diameter of the fiber is 15-48 mu m, and the length of the fiber is 12-20mm. The fibers within the length-diameter ratio range can realize higher tensile ductility of ECC concrete, and are easy to agglomerate when being too small or too large.
Further, the waste concrete fine powder is obtained by crushing, grinding and sieving waste concrete, and the particle size of the waste concrete fine powder is not more than 40 mu m.
Further, the preparation method of the suspension comprises the following steps:
reacting magnesium oxide powder with water to obtain magnesium hydroxide suspension; introducing carbon dioxide gas into the magnesium hydroxide suspension to carry out carbonization reaction to obtain the suspension; the carbonized product is mainly MgCO 3 ·3H 2 O and 4MgCO 3 ·Mg(OH) 2 ·4H 2 A mixture of O; the concentration of carbonized product in the suspension is 1-2wt%.
Under the concentration of the carbonized product, the carbonized product can play a role of filling, so that the microstructure of regenerated ECC is compact, the compressive strength is greatly improved, and the cement hydration product is decomposed due to the excessively high concentration, so that the strength of ECC is not facilitated.
The magnesium oxide in the invention adopts high-activity industrial magnesium oxide powder, and the higher the reactivity of the industrial magnesium oxide is, the higher the hydration degree of the industrial magnesium oxide is, so that the carbonization reaction of the industrial magnesium oxide is more easy to occur.
The CO can be improved by adopting a method of introducing carbon dioxide into the magnesium hydroxide suspension in advance 2 Sealing efficiency and reaction rate.
Further, the water reducer is a polycarboxylic acid high-efficiency water reducer, the solid content is more than or equal to 40%, and the water reducing rate is more than or equal to 30%; the consistency regulator is one of polyacrylamide, hydroxypropyl methylcellulose and xanthan gum.
The second technical scheme of the invention is that the preparation method of the low-carbon high-strength regenerated ECC comprises the following steps:
mixing cement, fly ash and waste concrete fine powder according to the mass parts, stirring for the first time, adding suspension, a water reducing agent and a consistency regulator, stirring for the second time, adding fiber, and stirring for the third time to obtain the low-carbon high-strength regenerated ECC.
Further, the first stirring is specifically stirring at a rotating speed of 60-70r/min for 30-60s to uniformly mix the powder materials.
The first stirring time is too short or the rotating speed is too low, so that the dry powder materials are unevenly mixed, and the stirring time is too long or the rotating speed is too high, dust is easily generated, and the powder materials are lost.
Further, the second stirring is specifically stirring at a rotating speed of 120-140r/min for 60-200s until the fluidity of the slurry reaches 300-450mm.
Too high rotation speed of the second stirring can cause segregation phenomenon of slurry, too low rotation speed can cause agglomeration of cement particles and decrease of dispersion performance of the polycarboxylate superplasticizer; too long a second agitation may result in reduced slurry workability and damage to the action of the admixture, and too short a time may result in the slurry not reaching a fluidity suitable for fiber dispersion.
Further, the third stirring is specifically to stir for 100-120s at a rotating speed of 120-140r/min, uniformly add the fibers during the stirring, and stir for 100-200s at a rotating speed of 290-300r/min, so as to ensure that the fibers are uniformly dispersed without agglomeration.
The third stirring is slow and fast firstly, namely, the original stirring is kept after the slurry reaches the preset fluidity, the fibers are added at a constant speed during the stirring, the fibers are added within 100-120s, the dispersion of the fibers is not beneficial to the post-feeding after the loss of the fluidity of the slurry is avoided, the stirring rotation speed is required to be increased to ensure the uniform dispersion of the fibers, the fibers are not agglomerated due to the insufficient rotation speed, and the ECC concrete is agglomerated but not beneficial to the dispersion of the fibers due to the excessive rotation speed.
The invention discloses the following technical effects:
the invention adopts a pre-carbonization method to lead carbon dioxide to be carbonizedThe gas is introduced into the magnesium hydroxide suspension, and the main carbonization reaction is as follows: (1) Mg (OH) 2 +CO 2 +H 2 O→MgCO 3 ·3H 2 O；(2)5Mg(OH) 2 +4CO 2 →4MgCO 3 ·Mg(OH) 2 ·4H 2 O. The carbonized suspension contains rich nano-to submicron carbon-magnesia sediment, and after being mixed with cement, regenerated micro powder and the like, the carbonized suspension not only can fill cracks and pores of the regenerated aggregate, but also can fill the pores in a concrete matrix, and the microstructure of the regenerated ECC is more compact. The pre-carbonization method not only can fix carbon dioxide and contribute to the aim of carbon neutralization, but also can improve the microstructure of concrete, so that the recycled ECC concrete is more environment-friendly, low-carbon and high-strength, and CO in the technology of curing the concrete by mineralizing the carbon dioxide is avoided 2 A slow diffusion process through the concrete matrix. In addition, the invention selects magnesium hydroxide instead of the common calcium hydroxide for carbonization because the carbonized product MgCO of the magnesium hydroxide 3 ·3H 2 O is needle-like, 4MgCO 3 ·Mg(OH) 2 ·4H 2 O is in a rose cluster shape, a network structure can be established in a solid matrix, interconnection is enhanced, and the mechanical property of regenerated ECC is facilitated. In contrast, the carbonized product of calcium hydroxide is mainly rhombohedral calcite, which cannot form the physical effect of spatial interconnection.
The invention has simple process for preparing the regenerated ECC by using the waste concrete fine powder. The invention takes local materials, replaces cement glue materials with waste concrete fine powder obtained by building removal, changes waste into valuable materials, and carries out resource comprehensive utilization. After the waste concrete is crushed, cleaned, ground and sieved, a certain amount of fine powder with the particle size smaller than 40 mu m is obtained and used as fine aggregate of the recycled concrete, so that ECC concrete pores can be filled, the compactness of the ECC concrete is improved, and the strength of the ECC concrete is further improved. In addition, the waste concrete micro powder has higher SiO 2 、Al 2 O 3 And higher alkali content. The gel can generate secondary hydration reaction to generate C-S-H gel in alkaline environment, and promote the development of strength. Strain hardening and multi-slit cracking characteristics of regenerated ECC (error correction code) prepared from waste concrete fine powderExcellent in property, and the ultimate elongation is more than 3.0%. When the content of the regenerated micro powder is not more than 45%, the strength loss of the regenerated ECC is not great, and the pre-carbonization method can further improve the use amount of the regenerated micro powder while improving the strength performance of the regenerated ECC.
The high-quality F class I low-calcium fly ash adopted by the invention can replace part of cement, plays roles of activity and filling, and can further improve the compactness of concrete. Fly ash has a temperature peak reduction effect, can reduce the temperature of concrete which is increased in the hydration process, and can effectively prevent carbide decomposition because of the characteristic that when the fly ash replaces part of cement, the hydration heat of the cement is reduced.
The water reducer adopted by the invention is the polycarboxylic acid high-efficiency water reducer, the solid content is more than or equal to 40%, the water reducing rate is more than or equal to 30%, the problem of strong water absorption of waste concrete aggregates can be effectively solved, the water-retaining property of the water-retaining polycarboxylic acid high-efficiency water reducer can improve the water retaining property of cement paste, reduce the resistance among cement particles, increase the fluidity, and have no influence on the strength of recycled aggregate concrete; the consistency regulator is added to regulate the viscosity of the concrete slurry to achieve the viscosity suitable for fiber dispersion; the length of the finally added fiber is 12-20mm, so that the regenerated ECC concrete with good ductility can be obtained, and the surface layer is easy to receive light.
The method has simple process steps and is easy to operate; the invention utilizes the waste concrete micro-powder and carbon dioxide mineralization technology, reduces the consumption of cement and reduces the carbon footprint; the prepared recycled ECC concrete retains high tensile ductility and strict crack control and is high in strength.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of the method for preparing low-carbon high-strength regenerated ECC.
Detailed Description
Various exemplary embodiments of the invention will now be described in detail, which should not be considered as limiting the invention, but rather as more detailed descriptions of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In addition, for numerical ranges in this disclosure, it is understood that each intermediate value between the upper and lower limits of the ranges is also specifically disclosed. Every smaller range between any stated value or stated range, and any other stated value or intermediate value within the stated range, is also encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the invention described herein without departing from the scope or spirit of the invention. Other embodiments will be apparent to those skilled in the art from consideration of the specification of the present invention. The specification and examples of the present invention are exemplary only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are intended to be inclusive and mean an inclusion, but not limited to.
The "parts" in the present invention are parts by mass unless otherwise specified.
The "%" in the invention is mass percent unless otherwise specified.
The raw materials used in the embodiments of the invention can be obtained through a purchase way unless otherwise specified.
The cement used in the embodiment of the invention is ordinary Portland cement 42.5; the high-activity industrial magnesia powder is particularly magnesia powder with activity of 180, the fly ash is particularly class-F I low-calcium fly ash, the screen residue of 45 mu m is not more than 12%, and the water demand ratio is not more than 95%; the water reducer is specifically a polycarboxylic acid high-efficiency water reducer, the solid content of which is more than or equal to 40 percent, and the water reducing rate of which is more than or equal to 30 percent; the consistency regulator is a commercial consistency regulator, in particular polyacrylamide; the fibers are PE and/or PVA fibers, the diameter of the fibers is 15-48 μm, and the length is 12-20mm.
The waste concrete fine powder used in the embodiment of the invention is prepared by the following steps: crushing, cleaning, grinding and screening the waste concrete with the strength of C30 to obtain waste concrete micro-fine powder with the particle size of not more than 40 mu m.
A schematic flow chart of the preparation of the low-carbon high-strength regenerated ECC is shown in FIG. 1.
Example 1
Step 1, reacting high-activity industrial magnesium oxide powder with water to generate magnesium hydroxide suspension with the concentration of 2%, then introducing carbon dioxide gas, and carbonizing magnesium hydroxide by absorbing carbon dioxide to obtain suspension with the concentration of 2%;
step 2, mixing 19.50 parts of cement, 14.60 parts of fly ash and 14.60 parts of waste concrete micro powder slowly for 40s at a rotating speed of 60r/min, adding 13.64 parts of suspension prepared in the step 1, 0.4 part of water reducer and 0.5 part of consistency regulator, and mixing slowly for 60s at a rotating speed of 135 r/min; and finally adding 1 part of PE fiber, slowly stirring for 120s at a rotation speed of 125r/min, and quickly stirring for 120s at a rotation speed of 300r/min to obtain the low-carbon high-strength regenerated ECC concrete. The 28-day compressive strength was 61.5MPa, the ultimate tensile strain was 3.92%, and the average crack width was 87. Mu.m.
Example 2
Step 1, reacting high-activity industrial magnesium oxide powder with water to generate magnesium hydroxide suspension with the concentration of 1%, then introducing carbon dioxide gas, and carbonizing magnesium hydroxide by absorbing carbon dioxide to obtain suspension with the concentration of 1%;
step 2, mixing 18.99 parts of cement, 24.41 parts of fly ash and 10.83 parts of waste concrete micro powder slowly for 30s at a rotating speed of 65r/min, adding 13.02 parts of suspension prepared in the step 1, 0.48 part of water reducer and 0.76 part of consistency regulator, and mixing slowly for 60s at a rotating speed of 140 r/min; and finally adding 1 part of PVA fiber, slowly stirring for 120s at the rotation speed of 130r/min, and quickly stirring for 120s at the rotation speed of 290r/min to obtain the low-carbon high-strength regenerated ECC concrete. The 28-day compressive strength was 67.3MPa, the ultimate tensile strain was 4.37%, and the average crack width was 59. Mu.m.
Example 3
Step 1, reacting high-activity industrial magnesium oxide powder with water to generate magnesium hydroxide suspension with the concentration of 2%, then introducing carbon dioxide gas, and carbonizing magnesium hydroxide by absorbing carbon dioxide to obtain suspension with the concentration of 2%;
step 2, slowly stirring 12.21 parts of cement, 24.39 parts of fly ash and 12.19 parts of waste concrete fine powder for 60s at a rotating speed of 56r/min, and then slowly stirring 12.81 parts of suspension prepared in the step 1, 0.49 part of water reducer and 0.78 part of consistency regulator for 60s at a rotating speed of 140 r/min; and finally adding 1 part of mixed fibers of PE and PVA (the volume ratio of the PE to the PVA is 1:1), slowly stirring for 120s at the rotating speed of 140r/min, and quickly stirring for 120s at the rotating speed of 296r/min to obtain the low-carbon high-strength regenerated ECC concrete. The 28-day compressive strength was 63.8MPa, the ultimate tensile strain was 4.21%, and the average crack width was 64. Mu.m.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.

Claims (10)

1. The low-carbon high-strength regenerated ECC is characterized by comprising, by mass, 11-30 parts of cement, 9-45 parts of fly ash, 9-30 parts of waste concrete micro powder, 5-30 parts of suspension, 0.1-1 part of water reducer, 0.2-2 parts of consistency regulator and 0.5-3 parts of fiber;
the suspension is prepared by introducing carbon dioxide gas into magnesium hydroxide suspension to carry out carbonization reaction.
2. The low carbon, high strength regenerative ECC of claim 1, wherein said cement is portland cement 42.5; the fly ash is class-F class-I low-calcium fly ash, the screen residue of 45 mu m is not more than 12%, and the water demand ratio is not more than 95%.
3. The low carbon, high strength regenerated ECC of claim 1 wherein the fibers are one or more of polyvinyl alcohol fibers, polypropylene fibers, polyethylene fibers, the fibers having a diameter of 15-48 μm and a length of 12-20mm.
4. The low-carbon high-strength regenerated ECC according to claim 1, characterized in that the waste concrete fine powder is obtained by crushing, grinding, sieving waste concrete, and the particle size of the waste concrete fine powder is not more than 40 μm.
5. The low carbon, high strength regenerated ECC of claim 1, wherein the method of preparing the suspension comprises the steps of:
reacting magnesium oxide powder with water to obtain magnesium hydroxide suspension; introducing carbon dioxide gas into the magnesium hydroxide suspension to carry out carbonization reaction to obtain the suspension;
the concentration of carbonized product in the suspension is 1-2wt%.
6. The low-carbon high-strength regenerated ECC (error correction code) according to claim 1, wherein the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, the solid content is more than or equal to 40%, and the water reducing rate is more than or equal to 30%; the consistency regulator is one of polyacrylamide, hydroxypropyl methylcellulose and xanthan gum.
7. A method for preparing the low-carbon high-strength regenerated ECC of claim 1, comprising the steps of:
mixing cement, fly ash and waste concrete fine powder according to the mass parts, stirring for the first time, adding suspension, a water reducing agent and a consistency regulator, stirring for the second time, adding fiber, and stirring for the third time to obtain the low-carbon high-strength regenerated ECC.
8. The method according to claim 7, wherein the first stirring is performed at a rotational speed of 60-70r/min for 30-60s.
9. The method according to claim 7, wherein the second stirring is performed at a rotational speed of 120-140r/min for 60-200s.
10. The method according to claim 7, wherein the third stirring is performed at a rotation speed of 120-140r/min for 100-120s, followed by accelerating stirring at a rotation speed of 290-300r/min for 100-200s.
CN202310034809.5A 2023-01-10 2023-01-10 Low-carbon high-strength regenerated ECC (error correction code) and preparation method thereof Pending CN116253547A (en)

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CN110662723A (en) * 2017-03-23 2020-01-07 索里迪亚科技公司 Carbonatable calcium silicate-based cement and concrete containing mineral additive and production method thereof
CN111417606A (en) * 2017-09-18 2020-07-14 南洋理工大学 Cementitious composition, cement-based structure, and method of forming same
CN109231923A (en) * 2018-10-29 2019-01-18 中国建材检验认证集团北京天誉有限公司 A method of regeneration ECC is prepared using waste concrete fine powder
CN110590260A (en) * 2019-10-12 2019-12-20 湖南大学 Method for improving performance of recycled concrete by using carbon dioxide
US20220048784A1 (en) * 2020-08-13 2022-02-17 Randall P. Moore Chemical process for the manufacture of magnesium carbonate from materials including magnesium hydroxide
CN112939538A (en) * 2021-03-19 2021-06-11 北京建筑材料科学研究总院有限公司 Method for preparing recycled concrete product by utilizing and sealing carbon dioxide
CN114873979A (en) * 2022-04-25 2022-08-09 华新水泥股份有限公司 Low-carbon cement concrete and preparation method thereof

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