CN112079597A - Carbonized cement paste powder high-ductility fiber cement composite material and preparation method thereof - Google Patents
Carbonized cement paste powder high-ductility fiber cement composite material and preparation method thereof Download PDFInfo
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- CN112079597A CN112079597A CN202010875730.1A CN202010875730A CN112079597A CN 112079597 A CN112079597 A CN 112079597A CN 202010875730 A CN202010875730 A CN 202010875730A CN 112079597 A CN112079597 A CN 112079597A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
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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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/246—Cements from oil shales, residues or waste other than slag from waste building materials, e.g. waste asbestos-cement products, demolition waste
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Abstract
The invention provides a carbonized cement paste powder high-ductility fiber cement composite material and a preparation method thereof, wherein the preparation method comprises the following steps: firstly, washing, screening and filter-pressing waste commercial concrete to obtain a dried cement paste cake, and preparing carbonized cement paste powder through drying, coarse grinding, carbonization, secondary drying and fine grinding; mixing and stirring quartz sand, carbonized cement paste powder, cement, silica fume and nano calcium carbonate; after stirring uniformly, adding water, a high-efficiency water reducing agent and an expanding agent, and continuing stirring; after the mixture is uniformly stirred, adding the PET fiber with the ultrahigh molecular weight and stirring until the fiber is uniformly distributed in the matrix; and finally, pouring the obtained slurry into a mould and forming by high-frequency mechanical vibration, and the invention provides the environment-friendly high-ductility fiber cement composite material with high additional value and the preparation method thereof.
Description
Technical Field
The invention relates to the field of environment-friendly building materials, and relates to a carbonized cement paste powder high-ductility fiber cement composite material and a preparation method thereof.
Background
With the rapid development of national economy, the volume of commercial concrete required for infrastructure construction and urbanization construction is enormous, and thus, considerable amounts of unhardened waste concrete are produced in commercial concrete mixing plants, mixing trucks and construction sites. The unhardened waste concrete collected in the sedimentation tank is washed and screened to further obtain the pebble, sand and cement paste wastewater. The cement slurry wastewater is difficult to directly discharge due to high alkalinity, and is usually dehydrated in a pressure filtration mode to form a dried cement slurry cake which is used for site landfill, thus causing resource waste. The dry cement slurry obtained by separating the waste commercial concrete is used for preparing the active regenerated micro powder with high added value, and the active regenerated micro powder is used as an auxiliary cementing material and has obvious economic and environmental benefits.
In order to solve the brittleness problem of common concrete, a high-ductility cement-based composite material (ECC) is rapidly developed, the composite material has multiple cracking behaviors and an ultrahigh-ductility fiber bridging effect, has obvious strain hardening performance, and the tensile strength, the deformability and the durability of the concrete material are obviously improved. However, more than half of the components of the high-ductility cement-based material are cement, fly ash or silica fume, so that the preparation cost is high, and the high-ductility cement-based material is not environment-friendly due to the incorporation of a large amount of cement. Therefore, there is an urgent need to develop an eco-friendly and sustainable high ductility cement-based composite material.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a carbonized cement paste powder high-ductility fiber cement composite material and a preparation method thereof, and solves the problems in the background art.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a carbonized cement paste powder high-ductility fiber cement composite material and a preparation method thereof comprise the following raw materials in parts by weight:
a method for preparing a high-ductility fiber cement composite material by using carbonized cement paste powder comprises the following steps
(1) Washing, screening and filter-pressing the waste commercial concrete to obtain a dried cement paste cake;
(2) drying and coarsely grinding the dried cement paste cake obtained in the step (1) to obtain cement paste powder;
(3) quickly and fully carbonizing the cement slurry powder subjected to coarse grinding in the step (2) in a low-humidity pressurizing carbonization box;
(4) further drying the cement paste powder carbonized in the step (3), and fully grinding to prepare carbonized cement paste powder;
(5) mixing and stirring quartz sand, carbonized cement paste powder, cement, silica fume and nano calcium carbonate;
(6) after stirring uniformly, adding water, a high-efficiency water reducing agent and an expanding agent, and continuing stirring;
(7) after the mixture is uniformly stirred, adding the PET fiber with the ultrahigh molecular weight and stirring until the fiber is uniformly distributed on the matrix;
(8) pouring the slurry obtained in the step (7) into a mould and forming by high-frequency mechanical vibration.
Preferably, the water content of the dried cement paste cake in the step (1) is 10-60%.
Preferably, the particle size of the dried cement paste cake in the step (2) is less than or equal to 150 μm after coarse grinding.
Preferably, the humidity of the low-humidity pressurized rapid carbonization in the step (3) is 40-60%, the temperature is 10-50 ℃, the air pressure is 0.01-0.5 MPa, and the concentration of CO2 gas is 20-99.9%.
Preferably, the particle size of the cement paste powder in the step (4) is less than or equal to 45 μm after fine grinding.
Preferably, the diameter range of the quartz sand grains in the step (5) is 40-70 meshes, and the content of silicon dioxide is more than or equal to 90%.
Preferably, the length of the ultrahigh molecular weight PET fiber in the step (7) is 6-24 mm, and the diameter is 10-80 μm.
Preferably, the stirring sequence in the steps (5) to (7) is that quartz sand, carbonized cement paste powder, cement, silica fume and nano calcium carbonate are stirred firstly, then water, a high-efficiency water reducing agent and an expanding agent are mixed for stirring, and finally ultrahigh molecular weight PET fibers are added for stirring.
Preferably, the stirring time in the step (5) is more than or equal to 0.5 min; the stirring time in the step (6) is more than or equal to 1 min; the mixing time in the step (7) is more than or equal to 3 min.
(III) advantageous effects
In conclusion, the invention obtains the dried cement paste cake by washing, screening, filter pressing and the like of the waste commercial concrete, and further improves the activity of the cement paste powder by drying, coarse grinding, carbonization, secondary drying, fine grinding and the like. The carbonized cement paste powder reduces the cement dosage required by the high-ductility cement-based material, reduces the preparation cost, and reduces CO in cement production2The discharge amount and the energy consumption relieve the problem that the limestone resource required by cement production is increasingly in short supply; the carbonized cement paste powder is prepared by utilizing the waste commercial concrete, so that the problems that the waste commercial concrete and cement paste waste water pollute the environment, are difficult to treat and the like are solved; meanwhile, the carbonization treatment of the cement paste powder can absorb CO discharged by cement production2A gas. The carbonized cement paste powder high-ductility fiber cement composite material developed by the invention not only can be used as a complex stress part, an anti-cracking part and the like of a newly-built structure, but also can be usedThe material is used as a structural maintenance and reinforcement material, and has remarkable environmental, economic and social benefits.
Drawings
Fig. 1 is a technical route diagram of the present invention.
Detailed Description
An embodiment of a carbonized cement paste powder high-ductility fiber cement composite material and a method for preparing the same according to the present invention will be further described with reference to fig. 1.
A carbonized cement paste powder high-ductility fiber cement composite material and a preparation method thereof comprise the following steps: firstly, washing, screening and filter-pressing waste commercial concrete to obtain a dried cement paste cake; further drying and coarsely grinding the dried cement paste cake to obtain cement paste powder; and (3) quickly and fully carbonizing the cement paste powder in a low-humidity pressurizing carbonization box, and further drying and fully grinding the cement paste powder to obtain carbonized cement paste powder. Then, mixing and stirring quartz sand, carbonized cement paste powder, cement, silica fume and nano calcium carbonate; after the mixture is uniformly stirred, adding water, the high-efficiency water reducing agent and the expanding agent, and continuously stirring; after the mixture is stirred uniformly again, the ultrahigh molecular weight PET fiber is added and stirred until the fiber is uniformly distributed in the matrix. And finally, pouring the carbonized cement paste powder high-ductility fiber cement composite slurry into a mould and molding by high-frequency mechanical vibration.
In the invention, the chemical components of the cement paste powder prepared from the waste commercial concrete mainly comprise CaO and SiO2、Al2O3、Fe2O3Etc. similar to cement, but the mineral composition of the cement paste powder is mainly hydrated Calcium Silicate (CSH), Calcium Hydroxide (CH) and a small amount of unhydrated cement clinker, and the hydration activity is low. When the carbonized cement paste powder is used as an auxiliary cementing material, the silica gel can rapidly react with calcium hydroxide to generate calcium silicate hydrate; the calcium carbonate has crystal nucleus effect and filling effect, can accelerate hydration reaction and refine aperture, and has the functions of forming calcium monocarbonate aluminate and stabilizing ettringite. Therefore, the proper amount of the carbonized cement paste powder can improve the strength of the cement-based material.
The fine grinding of the carbonized cement paste powder optimized by the invention further improves the activity of the carbonized cement paste powder by increasing the fineness of the carbonized cement paste powder.
In the invention, the silica fume is doped into the high-ductility cement-based material, so that the pores can be filled, and the compactness is increased; and the generation of secondary hydration can be promoted, more hydrated calcium silicate is formed, and the strength of the cement-based material is improved.
The optimized ultra-high molecular weight PET fiber has higher strength and elastic modulus, also has all the fineness and density of the flexible fiber, has stronger fiber bridging performance and ultimate tensile strength compared with the common fiber, can ensure that the fiber is not easily broken in the pulling-out process, and can obviously improve the tensile strength and toughness of the cement-based material.
The optimized nano calcium carbonate has a filling effect, can fill pores in a cement-based material, and increases compactness; the cement-based material has higher chemical activity, promotes the hydration reaction, and improves the strength of the cement-based material; the nano calcium carbonate has a crystal nucleus effect, can be bonded with surrounding hydration products, forms calcium silicate hydrate gel by taking the nano particles as crystal nuclei, improves the tissue structure of the cement-based material, forms a cubic network structure by taking the nano calcium carbonate as the crystal nuclei, and increases the strength of the cement-based material.
The following are three specific examples of the invention under different parameters:
example 1
A carbonized cement paste powder high-ductility fiber cement composite material and a preparation method thereof. The required raw materials comprise: 100 parts of cement; 100 parts of non-carbonized cement paste powder; 120 portions of quartz sand (the silicon content is more than or equal to 90); 30 parts of silica fume; 60 parts of water; 2 parts of ultrahigh molecular weight PET fiber; 1 part of nano calcium carbonate; 2 parts of a high-efficiency water reducing agent; 0.5 part of an expanding agent. Grinding the carbonized cement paste powder to be below 45 mu m; mixing quartz sand, carbonized cement paste powder, cement, silica fume and nano calcium carbonate for 1 min; after stirring uniformly, adding water, a high-efficiency water reducing agent and an expanding agent, and continuing stirring for 2 min; after stirring uniformly, finally adding the ultrahigh molecular weight PET fibers and stirring uniformly for 3 min; and finally, pouring the obtained slurry into a mould, and preparing the bone rod type tensile test piece by utilizing high-frequency mechanical vibration forming. The strength and ultimate deformation of the high ductility fiber cement composite of the carbonized cement paste powder after standard curing for 28d are shown in table 1.
Example 2
A carbonized cement paste powder high-ductility fiber cement composite material and a preparation method thereof. The required raw materials comprise: 100 parts of cement; 100 parts of carbonized cement paste powder; 120 portions of quartz sand (the silicon content is more than or equal to 90); 30 parts of silica fume; 60 parts of water; 2 parts of ultrahigh molecular weight PET fiber; 1 part of nano calcium carbonate; 2 parts of a high-efficiency water reducing agent; 0.5 part of an expanding agent. Grinding the carbonized cement paste powder to be below 45 mu m; mixing quartz sand, carbonized cement paste powder, cement, silica fume and nano calcium carbonate for 1 min; after stirring uniformly, adding water, a high-efficiency water reducing agent and an expanding agent, and continuing stirring for 2 min; after stirring uniformly, finally adding the ultrahigh molecular weight PET fibers and stirring uniformly for 3 min; and finally, pouring the obtained slurry into a mould, and preparing the bone rod type tensile test piece by utilizing high-frequency mechanical vibration forming. The strength and ultimate deformation of the high ductility fiber cement composite of the carbonized cement paste powder after standard curing for 28d are shown in table 1.
Example 3
A carbonized cement paste powder high-ductility fiber cement composite material and a preparation method thereof. The required raw materials comprise: 100 parts of cement; 100 parts of carbonized cement paste powder; 120 portions of quartz sand (the silicon content is more than or equal to 90); 30 parts of silica fume; 60 parts of water; 3 parts of ultrahigh molecular weight PET fiber; 1 part of nano calcium carbonate; 2 parts of a high-efficiency water reducing agent; 0.5 part of an expanding agent. Grinding the carbonized cement paste powder to be below 45 mu m; mixing quartz sand, carbonized cement paste powder, cement, silica fume and nano calcium carbonate for 1 min; after stirring uniformly, adding water, a high-efficiency water reducing agent and an expanding agent, and continuing stirring for 2 min; after stirring uniformly, finally adding the ultrahigh molecular weight PET fibers and stirring uniformly for 3 min; and finally, pouring the obtained slurry into a mould, and preparing the bone rod type tensile test piece by utilizing high-frequency mechanical vibration forming. The strength and ultimate deformation of the high ductility fiber cement composite of the carbonized cement paste powder after standard curing for 28d are shown in table 1.
TABLE 1 properties of high-ductility fiber cement composites of carbonized cement paste powders
| Performance of | Example 1 | Example 2 | Example 3 |
| 28d tensile Strength (MPa) | 6.23 | 7.56 | 8.02 |
| Ultimate tensile strain (%) | 5.14 | 5.59 | 6.78 |
Comparing table 1 examples 1 and 2, it was found that carbonization of the cement paste powder significantly increased the 28d tensile strength; comparing table 1, examples 2 and 3, it was found that increasing the amount of ultra-high molecular weight PET fiber incorporated increased the ultimate tensile strain to a greater extent. The three examples show that the ultimate tensile strain of the carbonized cement paste powder high-ductility fiber cement composite material exceeds 5 percent, and the deformation performance of the cement-based material is obviously improved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The high-ductility fiber cement composite material of carbonized cement paste powder is characterized in that: the feed comprises the following raw materials in parts by weight:
2. a preparation method of carbonized cement paste powder high-ductility fiber cement composite material is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
(1) washing, screening and filter-pressing the waste commercial concrete to obtain a dried cement paste cake;
(2) drying and coarsely grinding the dried cement paste cake obtained in the step (1) to obtain cement paste powder;
(3) quickly and fully carbonizing the cement slurry powder subjected to coarse grinding in the step (2) in a low-humidity pressurizing carbonization box;
(4) further drying the cement paste powder carbonized in the step (3), and fully grinding to prepare carbonized cement paste powder;
(5) mixing and stirring quartz sand, carbonized cement paste powder, cement, silica fume and nano calcium carbonate;
(6) after stirring uniformly, adding water, a high-efficiency water reducing agent and an expanding agent, and continuing stirring;
(7) after the mixture is uniformly stirred, adding the PET fiber with the ultrahigh molecular weight and stirring until the fiber is uniformly distributed on the matrix;
(8) pouring the slurry obtained in the step (7) into a mould and forming by high-frequency mechanical vibration.
3. The method of claim 2 for preparing a carbonized cement paste powder high-ductility fiber cement composite material, characterized in that: the water content of the dried cement paste cake in the step (1) is 10-60%.
4. The method of claim 2 for preparing a carbonized cement paste powder high-ductility fiber cement composite material, characterized in that: and (3) after coarse grinding, the particle size of the dried cement paste cake in the step (2) is less than or equal to 150 mu m.
5. The method of claim 2 for preparing a carbonized cement paste powder high-ductility fiber cement composite material, characterized in that: the low-humidity pressurized rapid carbonization in the step (3) has the humidity of 40-60%, the temperature of 10-50 ℃, the air pressure of 0.01-0.5 MPa and CO2The gas concentration is 20-99.9%.
6. The method of claim 2 for preparing a carbonized cement paste powder high-ductility fiber cement composite material, characterized in that: and (4) finely grinding the cement paste powder in the step (4) to obtain the cement paste powder with the particle size less than or equal to 45 mu m.
7. The method of claim 2 for preparing a carbonized cement paste powder high-ductility fiber cement composite material, characterized in that: the diameter range of the quartz sand grains in the step (5) is 40-70 meshes, and the content of silicon dioxide is more than or equal to 90%.
8. The method of claim 2 for preparing a carbonized cement paste powder high-ductility fiber cement composite material, characterized in that: the length of the ultrahigh molecular weight PET fiber in the step (7) is 6-24 mm, and the diameter is 10-80 μm.
9. The method of claim 2 for preparing a carbonized cement paste powder high-ductility fiber cement composite material, characterized in that: the stirring sequence in the steps (5) to (7) is that firstly quartz sand, carbonized cement paste powder, cement, silica fume and nano calcium carbonate are stirred, then water, a high-efficiency water reducing agent and an expanding agent are mixed and stirred, and finally ultrahigh molecular weight PET fibers are added and stirred.
10. The method of claim 2 for preparing a carbonized cement paste powder high-ductility fiber cement composite material, characterized in that: the stirring time in the step (5) is more than or equal to 0.5 min; the stirring time in the step (6) is more than or equal to 1 min; the mixing time in the step (7) is more than or equal to 3 min.
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