CN113185217A - Ultra-high performance concrete containing metakaolin and preparation method thereof - Google Patents
Ultra-high performance concrete containing metakaolin and preparation method thereof Download PDFInfo
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- CN113185217A CN113185217A CN202110435457.5A CN202110435457A CN113185217A CN 113185217 A CN113185217 A CN 113185217A CN 202110435457 A CN202110435457 A CN 202110435457A CN 113185217 A CN113185217 A CN 113185217A
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- ultra
- high performance
- metakaolin
- performance concrete
- concrete containing
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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
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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
- 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
- C04B14/04—Silica-rich materials; Silicates
- C04B14/10—Clay
- C04B14/106—Kaolin
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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
- 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
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/146—Silica fume
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Dispersion Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to an ultra-high performance concrete containing metakaolin and a preparation method thereof, wherein the concrete comprises the following components in parts by mass: 800 parts of 750-50 parts of cement, 40-50 parts of silica fume, 480 parts of metakaolin powder, 1800-2000 parts of machine-made sand, 25-35 parts of water reducing agent and 205 parts of water, wherein the specific surface area of the metakaolin is not less than 800m2The ignition loss is not more than 2.5 percent and the 28d activity index is not less than 115 percent per kg, and the raw materials are stirred and mixed according to the parts by mass to obtain the catalyst. Compared with the prior art, the invention has obvious functions of increasing the flowability and the strength of the fresh concrete and obviously improves the durability of the concrete.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to ultra-high performance concrete containing metakaolin and a preparation method thereof.
Background
The ultra-high performance concrete has the advantages of high strength, high corrosion resistance and durability, size reduction, structure self weight reduction, land saving, energy consumption reduction, structure maintenance cost and reconstruction cost reduction, and the like, and the technology thereof is developed into one of concrete technologies which are intensively researched and focused in the building industry. Meanwhile, with the development trend of high-rise and super-high-rise, large-span and underground construction and harsh environment of building design, the ultra-high performance concrete has outstanding application advantages in large-scale projects such as super-high-rise buildings, sea-crossing bridges, offshore oil production platforms and the like.
The ultra-high performance concrete generally refers to concrete with cubic compressive strength of more than 120MPa, but because of high cement consumption, the ultra-high performance concrete has high early hydration heat and serious shrinkage cracking, and because of low water cement ratio, the ultra-high performance concrete has larger slurry viscosity, so that certain difficulty exists in actual construction. With the increasing development of additive technology and other technologies, various outstanding problems of the ultra-high performance concrete are improved, but the problems are not completely solved.
In addition, the mixing proportion of the currently used ultra-high performance concrete is more than 4 or more types of needed cementing materials, and the used cement is 52.5 Portland cement, thereby further limiting the application of the ultra-high performance concrete in practical engineering.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the ultra-high performance concrete containing metakaolin, which has obvious functions of increasing the flowability and the strength of fresh concrete and obviously improves the durability of the concrete, and the preparation method thereof.
The purpose of the invention can be realized by the following technical scheme:
the inventor knows that metakaolin powder as an auxiliary cementing material with higher activity can replace slag powder and fly ash in the original ultra-high performance concrete, can further replace part of cement, and effectively reduces the using amount of the cement; in addition, the metakaolin powder has small adsorption on the water reducing agent, and cannot cause the increase of the fluidity loss of concrete slurry under the condition of high doping amount, so the following specific scheme is proposed:
the ultra-high performance concrete containing metakaolin comprises the following components in parts by mass: 800 portions of cement 750-.
Further, the particle size distribution of the silica fume is between 200 and 1000 nm.
Further, the metakaolin has a specific surface area of not less than 800m2The ignition loss is not more than 2.5 percent and the 28d activity index is not less than 115 percent per kg.
Further, the cement is P.O 42.5 ordinary portland cement.
Furthermore, the 28d mortar compressive strength of the cement is not lower than 48MPa, and the water consumption for the standard consistency of the cement is not more than 26 wt%.
Furthermore, the machine-made sand is II-area sand with fineness modulus of 2.7-3.0, the MB value of the machine-made sand is less than 1.4, the content of stone powder is not more than 3%, and the content of mud blocks is not more than 0.5%.
Further, the water reducing agent is a polycarboxylic acid water reducing agent.
Further, the solid content of the water reducing agent is between 35 and 45 percent, and the water reducing rate is not lower than 30 percent.
Further, the water should be tap water.
The preparation method of the ultra-high performance concrete containing metakaolin comprises the following steps: and stirring and mixing the cement, the silica fume, the metakaolin powder, the machine-made sand, the water reducing agent and the water according to the parts by mass to obtain the ultra-high performance concrete containing the metakaolin.
Further, the stirring time is 2-3 min.
The metakaolin powder used in the ultra-high performance concrete has a specific surface area not less than 800m2The concrete has the advantages that the loss on ignition is not more than 2.5 percent, the 28d activity index is not less than 115 percent, the concrete is an auxiliary cementing material which is applied less at the present stage, the concrete has the functions of high activity, early strength, improvement of the performance and mechanical property of fresh concrete and the like, and when the concrete is applied to the ultra-high performance concrete, the concrete not only has obvious effect of increasing the fluidity and the strength of the fresh concrete, but also obviously improves the durability of the concrete.
Compared with the prior art, the invention has the following beneficial effects:
(1) the ultra-high performance concrete prepared by using the metakaolin powder can solve the problem of difficult construction caused by small fluidity of the ultra-high performance concrete, the used cement amount is relatively low, the mineral admixture doping amount is large, the working performance is good, and the 28d compressive strength is 150-165 MPa;
(2) the invention adopts common Portland cement commonly used in commercial concrete mixing plants, and is double-doped with large-dosage metakaolin powder and a small amount of silica fume, the concrete mixing time is short, the comprehensive cost is lower, the mass production can be realized, and the invention has wide application prospect.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
The ultra-high performance concrete containing metakaolin comprises the following components in parts by mass: 800 portions of cement 750-.
The particle size distribution of the silica fume is between 200 and 1000 nm. The specific surface area of metakaolin is not less than 800m2The ignition loss is not more than 2.5 percent and the 28d activity index is not less than 115 percent per kg.
The cement is P.O 42.5 ordinary portland cement. The 28d mortar compressive strength of the cement is not lower than 48MPa, and the water consumption for the standard consistency of the cement is not more than 26 wt%.
The machine-made sand is II-zone sand with fineness modulus of 2.7-3.0, MB value of the machine-made sand is less than 1.4, stone powder content is not more than 3%, and mud block content is not more than 0.5%.
The water reducing agent is a polycarboxylic acid water reducing agent. The solid content of the water reducing agent is between 35 and 45 percent, and the water reducing rate is not lower than 30 percent.
The preparation method of the ultra-high performance concrete containing metakaolin comprises the following steps: and stirring and mixing the cement, the silica fume, the metakaolin powder, the machine-made sand, the water reducing agent and the water for 2-3min according to the parts by mass to obtain the ultra-high performance concrete containing the metakaolin.
Example 1
The ultra-high performance concrete prepared by using metakaolin powder comprises the following components in per cubic meter: 770kg of cement, 43kg of silica fume, 475kg of metakaolin powder, 1960kg of machine-made sand, 33kg of water reducing agent and 200kg of water. The specific surface area of metakaolin is not less than 800m2The ignition loss is not more than 2.5 percent and the 28d activity index is not less than 115 percent per kg. After the materials are completely prepared, the components are mixed, and the mixture is stirred for 2.5min by a forced stirrer, so that the ultra-high performance concrete prepared by using the metakaolin powder, which is disclosed by the invention, is prepared, and is good in workability and free of segregation and bleeding. Concrete mix properties and hardening properties are shown in table 1.
Example 2
The ultra-high performance concrete prepared by using metakaolin powder comprises the following components in per cubic meter: 800kg of cement, 46kg of silica fume, 450kg of metakaolin powder, 1900kg of machine-made sand, 35kg of water reducing agent and 202kg of water. The specific surface area of metakaolin is not less than 800m2The ignition loss is not more than 2.5 percent and the 28d activity index is not less than 115 percent per kg. After the materials are completely prepared, the components are mixed, and the mixture is stirred for 2.5min by a forced stirrer, so that the ultra-high performance concrete prepared by using the metakaolin powder, which is disclosed by the invention, is prepared, and is good in workability and free of segregation and bleeding. Concrete mix properties and hardening properties are shown in table 1.
Comparative example 1
A concrete having the following composition per cubic meter: 800kg of cement, 46kg of silica fume, 450kg of metakaolin powder, 1900kg of machine-made sand, 35kg of water reducing agent and 202kg of water. In this example, metakaolin having a specific surface area of 650m was used2Metakaolin with a 28d activity index of 95% per kg. After the materials are completely prepared, the components are mixed, and the mixture is stirred for 2.5min by a forced stirrer, so that the concrete can be prepared, and the workability and the strength of the concrete are obviously reduced. Concrete mix properties and hardening properties are shown in table 1.
TABLE 1 concrete Performance test results
| Extension/mm | 28d compressive strength/MPa | |
| Example 1 | 650 | 152.7 |
| Example 2 | 670 | 156.4 |
| Comparative example 1 | 585 | 137.4 |
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (10)
1. The ultra-high performance concrete containing metakaolin is characterized by comprising the following components in parts by mass: 800 portions of cement 750-.
2. The ultra-high performance concrete containing metakaolin as set forth in claim 1, wherein the silica fume has a particle size distribution of 200-1000 nm.
3. The ultra-high performance concrete containing metakaolin as claimed in claim 1, wherein the metakaolin has a specific surface area of not less than 800m2The ignition loss is not more than 2.5 percent and the 28d activity index is not less than 115 percent per kg.
4. The ultra-high performance concrete containing metakaolin as claimed in claim 1, wherein the cement is P-O42.5 portland cement.
5. The ultra-high performance concrete containing metakaolin as claimed in claim 1 or 4, wherein the cement has a 28d mortar compressive strength of not less than 48MPa and a water consumption of not more than 26 wt% for a standard consistency of cement.
6. The ultra-high performance concrete containing metakaolin as claimed in claim 1, wherein the machine-made sand is zone II sand with fineness modulus of 2.7-3.0, MB value of the machine-made sand is less than 1.4, stone powder content is not more than 3%, and mud cake content is not more than 0.5%.
7. The ultra-high performance concrete containing metakaolin as claimed in claim 1, wherein the water reducing agent is a polycarboxylic acid water reducing agent.
8. The ultra-high performance concrete containing metakaolin as claimed in claim 1 or 7, wherein the solid content of the water reducing agent is between 35% and 45%, and the water reducing rate is not less than 30%.
9. A method for preparing the ultra-high performance concrete containing metakaolin according to any one of claims 1 to 8, characterized in that the method comprises: and stirring and mixing the cement, the silica fume, the metakaolin powder, the machine-made sand, the water reducing agent and the water according to the parts by mass to obtain the ultra-high performance concrete containing the metakaolin.
10. The method for preparing ultra-high performance concrete containing metakaolin as claimed in claim 9, wherein the stirring time is 2-3 min.
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| CN202110435457.5A CN113185217B (en) | 2021-04-22 | 2021-04-22 | Ultra-high performance concrete containing metakaolin and preparation method thereof |
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| CN202110435457.5A CN113185217B (en) | 2021-04-22 | 2021-04-22 | Ultra-high performance concrete containing metakaolin and preparation method thereof |
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| CN113185217B CN113185217B (en) | 2022-09-06 |
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Citations (8)
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| CN106587686A (en) * | 2016-12-15 | 2017-04-26 | 云南省建设投资控股集团有限公司 | Metakaolin-based high-performance concrete composite admixture and application thereof |
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2021
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