CN115353348B - Ultrahigh-performance concrete and preparation method and application thereof - Google Patents
Ultrahigh-performance concrete and preparation method and application thereof Download PDFInfo
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- CN115353348B CN115353348B CN202210989210.2A CN202210989210A CN115353348B CN 115353348 B CN115353348 B CN 115353348B CN 202210989210 A CN202210989210 A CN 202210989210A CN 115353348 B CN115353348 B CN 115353348B
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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
- 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
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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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- 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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- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention belongs to the technical field of building materials, and particularly relates to ultra-high performance concrete and a preparation method and application thereof. The preparation method comprises the following steps: (1) Adding raw materials comprising a cementing material, quartz sand, silica fume, a water-retaining agent, water, a water reducing agent and a defoaming agent into an internal mixer, and mixing for a period of time to obtain a mixture; (2) Starting a vacuum pump, vacuumizing the internal mixer to be below-0.08 MPa, mixing for a period of time, and quickly recovering the pressure in the internal mixer to normal pressure within 10-20 seconds while mixing to obtain the concrete slurry. According to the invention, through the vacuum shearing, extruding and stirring process, the raw materials are fully and uniformly mixed, and a large amount of bubbles are eliminated, so that the ultrahigh strength is met, the surface performance of the decorative concrete is also met, and a technical support is provided for the preparation of the ultrahigh-performance concrete artware.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to ultra-high performance concrete and a preparation method and application thereof.
Background
The ultra-high performance concrete is characterized by ultra-high strength, toughness and durability, and becomes a new system for realizing large span of cement-based material performance. Compared with common concrete, the ultra-high performance concrete can greatly reduce the material consumption, reduce the construction cost, save resources and reduce the energy consumption of production, transportation and construction.
The decorative concrete is poured and formed at one time, the natural texture and the well-designed natural state of the concrete are used as the expression form of the decorative surface, the surface of the decorative concrete is smooth and flat, the whole lines are smooth, and the decorative concrete can be directly used for building facades. In recent years, decorative concrete products are used for decorating the surfaces of inner and outer walls of buildings, and are also used for manufacturing artware more and more, and the decorative concrete artware is popular with more and more people due to the rich and varied appearance and the unique fresh and natural quality.
However, the ultra-high performance concrete adopts the traditional stirring process, and the materials and the fibers are difficult to be completely dispersed, so that obvious air holes and other defects are formed in the concrete, and the fluctuation of the strength of the prepared concrete is larger. In addition, the ultra-high performance concrete cementing material has large dosage and high viscosity, and the air bubbles in the ultra-high performance concrete cementing material are difficult to discharge, so that a large number of air holes are left on the surface of the prepared decorative concrete handicraft, and the aesthetic feeling of the handicraft is seriously influenced. In rubber processing, a vacuum internal mixer is mostly adopted to increase rubber mixing, and materials can be well dispersed under the action of shearing and extrusion. However, the mixing of ultra-high performance concrete by an internal mixer is not suitable because the upper ram usually applies higher pressure (0.5-2 MPa) to the raw materials in the mixing process of the internal mixer, so that slurry and aggregate are separated in the mixing process to form bleeding or slurry bleeding, and the performance of the obtained concrete is reduced.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide ultra-high performance concrete, a preparation method and application thereof.
Specifically, the invention provides the following technical scheme:
a preparation method of ultra-high performance concrete comprises the following steps:
(1) Adding raw materials comprising a cementing material, quartz sand, silica fume, a water-retaining agent, water, a water reducing agent and a defoaming agent into an internal mixer, and mixing for a period of time to obtain a mixture;
(2) Starting a vacuum pump, vacuumizing the internal mixer to be below-0.08 MPa, mixing for a period of time, rapidly recovering the pressure in the internal mixer to normal pressure within 10-20 seconds while mixing, and stopping stirring to obtain the concrete slurry.
The invention discloses a double-roller stirring method for concrete raw materials, which is characterized in that two groups of stirring paddles are adopted for stirring in an internal mixer, the concrete raw materials are mixed and refined in vacuum through the internal mixer, the concrete raw materials are extruded between the stirring paddles and a cylinder wall and between the two stirring paddles in the stirring process, and the raw materials can be uniformly dispersed under the double actions of shearing and extrusion, so that the agglomeration is reduced, and a large number of bubbles are eliminated. It is further found that pressure in the internal mixer is rapidly recovered to the normal pressure within 10-20 seconds, the violent change of external environment atmospheric pressure in the accessible concrete mixing process is favorable to bubble self volume sudden change and breaks, further reduces bubble content in the concrete, thereby realizes the decorative effect of the perfect pore-free surface, makes the ultra-high performance concrete have higher bending strength and compressive strength, and the surface almost has no bubble, has good outward appearance, satisfies the superhigh strength promptly, satisfies again and decorates concrete surface property.
Preferably, the step (1) is specifically:
mixing the cementing material, quartz sand, silica fume and a water-retaining agent to obtain a mixture;
adding the mixture into an internal mixer for mixing for a certain time;
adding water, a water reducing agent and a defoaming agent into an internal mixer, and mixing for a certain time to obtain fresh concrete slurry;
the fiber is added into an internal mixer and is mixed for a certain time.
The invention discovers that the adoption of the stirring mode in the step (1) is beneficial to more uniform mixing of the raw materials, and lays a foundation for preparing the ultra-high performance concrete with excellent performance.
Preferably, in the mixing process of the step (2), the pressure of the top plug of the internal mixer on the concrete slurry is 0-0.2 MPa. The invention finds that the pressure is controlled below 0.2MPa, so that the separation of slurry and aggregate in the stirring process can be avoided, and the mixing efficiency is improved.
Preferably, the distance between the wall of the stirring barrel of the internal mixer and the stirring paddle is 5-20 mm. In the above range, the cylinder wall and the stirring paddle can realize better vacuum shearing and extruding effects.
Preferably, the preparation method further comprises: and adding the obtained concrete slurry into a mould for roll forming, and curing the roll-formed material for 24 +/-2 hours.
In a specific embodiment, the curing is performed with a mold, and the mold is removed after the curing is completed.
Preferably, the raw materials comprise 20-50% of quartz sand by mass ratio;
the quartz sand comprises the following components in percentage by mass (30-50): (20-40): (20-40) quartz sand with the granularity of 14-28 meshes, quartz sand with the granularity of 28-48 meshes and quartz sand with the granularity of 48-90 meshes.
The invention discovers that the quartz sand with the dosage and the gradation can realize the compact accumulation of the ultra-high performance concrete, so that the ultra-high performance concrete has higher flexural strength and compressive strength.
Further preferably, the quartz sand comprises the following components in percentage by mass (35-45): (25-35): (25-35) quartz sand with a particle size of 14-28 meshes, quartz sand with a particle size of 28-48 meshes and quartz sand with a particle size of 48-90 meshes.
Most preferably, the quartz sand comprises 40:30:30 of quartz sand with 14-28 meshes, 28-48 meshes and 48-90 meshes.
Further, the quartz sand is round-grained quartz sand; the effect is best by adopting the quartz sand.
Preferably, the mass ratio of the quartz sand to the cementing material is 0.4-1.0.
The invention discovers that the number of air holes on the surface of the ultra-high performance concrete is less and less along with the reduction of the sand-to-glue ratio, and the decorative effect is better and better. But the sand-cement ratio is reduced, the gelled material in the material system is increased, the shrinkage of concrete is increased, and when the sand-cement ratio is less than 0.4, obvious cracks can appear on part of the component, and the sand-cement ratio is preferably 0.4-1.0.
Further, the cementing material is aluminate cement and/or portland cement;
still further, the cementitious material is p.i 42.5 cement or p.i 52.5 cement.
The invention also discovers that the flexural strength and the compressive strength of the ultra-high performance concrete can be further improved by compounding the cementing material and the quartz sand according to a specific proportion.
Preferably, the raw materials comprise the following components in parts by weight:
1100-1700 parts of cementing material, 700-1300 parts of quartz sand, 50-200 parts of silica fume, 0-150 parts of fiber, 140-260 parts of water, 35-65 parts of water reducing agent, 0.5-1.5 parts of defoaming agent and 1-5 parts of internal water-retaining agent.
According to the invention, the quartz sand can be used for tightly packing the ultra-high performance concrete, the surface performance of the ultra-high performance concrete can be improved by using the cementing material, and the occurrence of sand exposure lamps is reduced. The water reducing agent can reduce the water-to-cement ratio, improve the fluidity of concrete and facilitate the discharge of air bubbles. The defoaming agent can eliminate harmful bubbles with larger size, so that the bending strength and the compressive strength of the ultra-high performance concrete are improved, and the components interact with each other to play a complementary role in advantages.
Further preferably, the silica fume is selected from one or more of 85-grade silica fume, 90-grade silica fume and 95-grade silica fume.
Further preferably, the fibers are selected from one or more of steel fibers, polyoxymethylene fibers, polyvinyl alcohol fibers.
More preferably, the water reducing agent is a polycarboxylic acid high-performance water reducing agent, and the water reducing rate of the water reducing agent is more than 35%.
Further preferably, the water-retaining agent is a water-absorbing resin disclosed in chinese patent CN113667061 a.
For the raw material formula system of the invention, the water-retaining agent matched with the raw material formula system is as described above; the water-retaining agent can avoid the reduction of concrete moisture caused by the vacuum shearing and extruding stirrer in the vacuumizing process, and ensure the working performance of concrete.
The invention also provides the ultra-high performance concrete prepared by the preparation method, and the ultra-high performance concrete is prepared by the preparation method.
The invention also provides the application of the ultra-high performance concrete in building decoration materials.
The invention has the beneficial effects that:
the ultra-high performance concrete provided by the invention ensures the shrinkage performance and the surface performance of the material by adjusting the sand-to-glue ratio of the material; through the processes of vacuum shearing, extruding and stirring and variable-pressure stirring, various raw materials containing fibers can be uniformly distributed in the ultra-high-performance concrete, bubbles in the concrete are eliminated, the strength and the decorative appearance of the materials are ensured, and a powerful technical support is provided for the development of the ultra-high-performance decorative concrete.
Drawings
Fig. 1 is a surface morphology of CJC prepared by the conventional stirring method of comparative example 1.
FIG. 2 is a surface topography of SJC prepared in example 4 using vacuum shear extrusion agitation.
Figure 3 is the surface topography of JC prepared using vacuum shear extrusion stirring in example 1.
Fig. 4 is a surface morphology of an LJC prepared by vacuum shear extrusion stirring in comparative example 2.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The examples do not show the specific techniques or conditions, according to the technical or conditions described in the literature in the field, or according to the product specifications. The reagents or instruments used are conventional products available from regular distributors, not indicated by the manufacturer.
The water-retaining agents referred to in the following examples were prepared according to the method of example 2 in CN 113667061A.
The internal mixer used in the following examples was an ML-50L internal mixer manufactured by Beijing Longtai aerospace electro-mechanical technology, inc., and the rotor speed was 48-60rpm.
Example 1
This example provides an ultra-high performance concrete (JC) having the following formulation:
P.I 42.5 cement 1130kg/m 3 192kg/m silica fume 3 14-28 mesh quartz sand 500kg/m 3 370kg/m of 28-48 mesh quartz sand 3 370kg/m of 48-90-mesh quartz sand 3 250kg/m of water 3 60kg/m of water reducing agent 3 Antifoam agent 1.0kg/m 3 2kg/m of water-retaining agent 3 ；
The preparation method comprises the following steps:
(1) Mixing the cementing material, quartz sand, silica fume and a water-retaining agent to obtain a mixture;
(2) Adding the mixture into an internal mixer and stirring for 30s;
(3) Adding water, a water reducing agent and a defoaming agent into an internal mixer, and stirring for 5min to obtain fresh concrete slurry;
(4) Starting a vacuum pump, vacuumizing the internal mixer to be below-0.08 MPa, and stirring for 3min. And (3) closing the vacuum pump, opening the air suction valve, continuing stirring, recovering the normal pressure of the internal mixer within 15 seconds by controlling the size of the air suction valve, and closing the stirring machine to obtain the freshly-mixed ultra-high performance concrete slurry.
(5) And adding the slurry into a mortar triple-connected die and a silica gel die, curing for 24 hours with a film in a laboratory, and then demolding to prepare the ultra-high performance concrete.
Example 2
This example provides an ultra-high performance concrete (POX) having the following formulation:
P.I 42.5 cement 1130kg/m 3 190kg/m of silica fume 3 Polyoxymethylene fiber 13kg/m 3 14-28 mesh quartz sand 500kg/m 3 370kg/m of 28-48 mesh quartz sand 3 370kg/m of 48-90-mesh quartz sand 3 250kg/m of water 3 60kg/m of water reducing agent 3 Defoaming agent 1.0kg/m 3 2kg/m of water-retaining agent 3 ；
The preparation method comprises the following steps:
(1) Mixing the cementing material, quartz sand, silica fume and a water-retaining agent to obtain a mixture;
(2) Adding the mixture into an internal mixer and stirring for 30s;
(3) Adding water, a water reducing agent and a defoaming agent into an internal mixer, and stirring for 5min to obtain fresh concrete slurry;
(4) Adding the fiber into an internal mixer, and stirring for 1min;
(5) Starting a vacuum pump, vacuumizing the internal mixer to be below-0.08 MPa, stirring for 3min, closing the vacuum pump, opening an air suction valve, continuing stirring, recovering the internal mixer to normal pressure within 15 seconds by controlling the size of the air suction valve, and closing the stirring machine to obtain the freshly-mixed ultra-high performance concrete slurry.
(6) And adding the slurry into a mortar triple-connected mold and a silica gel mold, curing with a film in a laboratory for 24 hours, and then demolding to prepare the ultra-high performance concrete.
Example 3
The embodiment provides an ultra-high performance concrete (GX), which comprises the following formula:
1130kg/m of P.I 42.5 cement 3 192kg/m silica fume 3 120kg/m steel fiber 3 14-28 mesh quartz sand 500kg/m 3 370kg/m of 28-48 mesh quartz sand 3 370kg/m of 48-90-mesh quartz sand 3 250kg/m of water 3 60kg/m of water reducing agent 3 Antifoam agent 1.0kg/m 3 2kg/m of water retention agent 3 ；
The preparation method comprises the following steps:
(1) Mixing the cementing material, quartz sand, silica fume and a water-retaining agent to obtain a mixture;
(2) Adding the mixture into an internal mixer and stirring for 30s;
(3) Adding water, a water reducing agent and a defoaming agent into an internal mixer, and stirring for 5min to obtain fresh concrete slurry;
(4) Adding the fiber into an internal mixer, and stirring for 1min;
(5) Starting a vacuum pump, vacuumizing the internal mixer to be below-0.08 MPa, stirring for 3min, closing the vacuum pump, opening an air suction valve, continuing stirring, controlling the size of the air suction valve to enable the internal mixer to recover to normal pressure within 15 seconds, and closing the stirring machine to obtain the freshly-mixed ultra-high performance concrete slurry.
(6) And adding the slurry into a mortar triple-connected die and a silica gel die, curing for 24 hours with a film in a laboratory, and then demolding to prepare the ultra-high performance concrete.
Example 4
The embodiment provides an ultra-high performance concrete (SJC) with a sand-to-cement ratio of 0.2 and a formula as follows:
P.I 42.5 cement 1650kg/m 3 280kg/m of silica fume 3 154kg/m of 14-28 mesh quartz sand 3 116kg/m of 28-48 mesh quartz sand 3 116kg/m of 48-90-mesh quartz sand 3 386kg/m of water 3 60kg/m of water reducing agent 3 Antifoam agent 1.0kg/m 3 2kg/m of water-retaining agent 3 ；
The preparation method comprises the following steps:
(1) Mixing the cementing material, quartz sand, silica fume and a water-retaining agent to obtain a mixture;
(2) Adding the mixture into an internal mixer and stirring for 30s;
(3) Adding water, a water reducing agent and a defoaming agent into an internal mixer, and stirring for 5min to obtain fresh concrete slurry;
(4) Starting a vacuum pump, vacuumizing the internal mixer to be below-0.08 MPa, stirring for 3min, closing the vacuum pump, opening an air suction valve, continuing stirring, recovering the internal mixer to normal pressure within 15 seconds by controlling the size of the air suction valve, and closing the stirring machine to obtain the freshly-mixed ultra-high performance concrete slurry.
(5) And adding the slurry into a mortar triple-connected die and a silica gel die, curing for 24 hours with a film in a laboratory, and then demolding to prepare the ultra-high performance concrete.
Comparative example 1
This comparative example provides an ultra-high performance concrete (CJC) using the same mix ratio as example 1 except that: the preparation method adopts a traditional stirrer for preparation.
Comparative example 2
This comparative example provides an ultra-high performance concrete (LJC) using the same mix ratio as example 1, except that: in the step (5), the size of the air suction valve is controlled to enable the internal mixer to recover the normal pressure within 50 seconds.
Test examples
The fluidity, 28-day compression strength and flexural strength of the ultra-high performance concrete in examples and comparative examples were tested according to GB50080 and GB50081, and the results are shown in Table 1;
TABLE 1 Properties of the ultra-high Performance concretes
| Test group | Slump/mm | 28d flexural strength/MPa | 28d compressive strength/MPa |
| JC | 240 | 22.3 | 119.60 |
| POX | 230 | 34.7 | 139.90 |
| GX | 235 | 38.2 | 186.05 |
| SJC | 230 | 24.1 | 119.75 |
| CJC | 210 | 20.8 | 103.30 |
| LJC | 220 | 21.8 | 115.26 |
As can be seen from table 1, JC has a slightly increased 28d flexural strength and a substantially unchanged 28d compressive strength after the mastic ratio is reduced as compared with SJC. By comparing fig. 1 to 4, CJC artware prepared by the traditional stirring method has obvious pores on the surface, and SJC and JC prepared by the vacuum shearing, extruding and stirring method have fewer pores on the surface and beautiful appearance. But SJC already started to develop significant cracks in the surface due to the large cement. Although LJC adopts vacuum shearing, extruding and stirring, obvious bubbles are also formed on the surface of the LJC, so that the change speed of the air pressure is reduced after the time for recovering to the normal pressure is mainly prolonged, and the bubbles in the mortar cannot be completely eliminated.
Compared with the JC adopting vacuum shearing, extruding and stirring, the rupture strength of the JC is increased by 7 percent and the compression strength of the JC is increased by 16 percent compared with the CJC prepared by adopting the traditional stirring mode. The method has more obvious improvement on the strength of the concrete containing the fibers.
The above examples are only for describing 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 to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (10)
1. The preparation method of the ultra-high performance concrete is characterized by comprising the following steps:
(1) Adding raw materials comprising a cementing material, quartz sand, silica fume, a water-retaining agent, water, a water reducing agent and a defoaming agent into an internal mixer, and mixing for a period of time to obtain a mixture; the mass ratio of the quartz sand to the cementing material is 0.4 to 1.0;
(2) Starting a vacuum pump, vacuumizing the internal mixer to be below-0.08 MPa, mixing for a period of time, and quickly recovering the pressure in the internal mixer to normal pressure within 10 to 20 seconds while mixing to obtain concrete slurry;
and (3) in the mixing process of the step (2), the pressure of the upper top plug of the internal mixer to the concrete slurry is 0 to 0.2MPa.
2. The preparation method according to claim 1, wherein the step (1) is specifically:
mixing the cementing material, quartz sand, silica fume and a water-retaining agent to obtain a mixture;
adding the mixture into an internal mixer for mixing for a certain time;
adding water, a water reducing agent and a defoaming agent into an internal mixer, and mixing for a certain time to obtain fresh concrete slurry;
the fiber is added into an internal mixer and mixed for a certain time.
3. The production method according to claim 1 or 2, characterized in that the raw material comprises 20-50% by mass of quartz sand;
the quartz sand comprises the following components in percentage by mass (30-50): (20-40): (20-40) quartz sand with the granularity of 14-28 meshes, quartz sand with the granularity of 28-48 meshes and quartz sand with the granularity of 48-90 meshes.
4. The method according to claim 3, wherein the quartz sand comprises, by mass, from (35 to 45): (25-35): (25-35) quartz sand with the granularity of 14-28 meshes, quartz sand with the granularity of 28-48 meshes and quartz sand with the granularity of 48-90 meshes.
5. A method according to claim 1 or 2, characterized in that the cementitious material is aluminate cement and/or portland cement.
6. The preparation method according to claim 5, wherein the cementing material is P.I 42.5 cement or P.I 52.5 cement.
7. The preparation method according to claim 1 or 2, wherein the raw materials comprise the following components in parts by weight:
1100-1700 parts of cementing material, 700-1300 parts of quartz sand, 50-200 parts of silica fume, 0-150 parts of fiber, 140-260 parts of water, 35-65 parts of water reducing agent, 0.5-1.5 parts of defoaming agent and 1-5 parts of water-retaining agent.
8. The preparation method of claim 7, wherein the silica fume is selected from one or more of 85-grade silica fume, 90-grade silica fume and 95-grade silica fume;
and/or the fiber is selected from one or more of steel fiber, polyformaldehyde fiber and polyvinyl alcohol fiber;
and/or the water reducing agent is a polycarboxylic acid high-performance water reducing agent, and the water reducing rate is more than 35%;
and/or the water-retaining agent is a water-absorbent resin disclosed in Chinese patent CN 113667061A.
9. An ultra-high performance concrete prepared by the method of any one of claims 1 to 8.
10. Use of the ultra-high performance concrete prepared by the preparation method of any one of claims 1 to 8 in building decoration materials.
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| CN105904591A (en) * | 2016-06-20 | 2016-08-31 | 欧志华 | Vacuum concrete mixing process |
| CN110281392A (en) * | 2019-07-08 | 2019-09-27 | 黄贺明 | A kind of ultra-high performance concrete vacuum stirring technique |
| CN113733353A (en) * | 2021-09-17 | 2021-12-03 | 湖南岳煌建材科技有限公司 | Production process of super-durable building concrete |
| CN114133185B (en) * | 2021-12-13 | 2023-03-24 | 北京建筑材料科学研究总院有限公司 | Ultrahigh-performance concrete and preparation method and application thereof |
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