CN111410479A - Ultrahigh-performance concrete and preparation method thereof - Google Patents
Ultrahigh-performance concrete and preparation method thereof Download PDFInfo
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- CN111410479A CN111410479A CN202010236038.4A CN202010236038A CN111410479A CN 111410479 A CN111410479 A CN 111410479A CN 202010236038 A CN202010236038 A CN 202010236038A CN 111410479 A CN111410479 A CN 111410479A
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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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Abstract
The invention relates to an ultra-high performance concrete and a preparation method thereof, wherein the ultra-high performance concrete comprises the following components in parts by weight: 400 portions and 700 portions of cementing material; aggregate 1500 + 2100 parts; 70-250 parts of steel fiber or 0.5-5 parts of PP fiber; 5-20 parts of a water reducing agent; 2-10 parts of a chemical auxiliary agent; 100 portions of water and 150 portions of water. The ultra-high performance concrete prepared by the invention can reduce the consumption of cementing materials under the condition of meeting the requirements of the ultra-high performance concrete, not only saves the cost, but also can protect the environment and realize the circular economy and sustainable development.
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 thereof.
Background
In the modern society, the development of the building field of China is fierce day by day, the building industry is continuously developing towards the direction of high-rise, large-scale and modernization, and the ultra-high performance concrete is used as a novel concrete material and begins to appear in the building construction field. China also gives high attention to the ultra-high performance concrete, and makes breakthrough research progress on the aspects of the performance, the mixing proportion and the like of the ultra-high performance concrete.
The prior art discloses an ultra-high performance concrete applied to high and cold regions and a preparation method thereof, wherein the utilization of a cementing material is 900-1200 kg/m-3Wherein the cement dosage is 800-1100kg/m3. The prior art discloses a marine ultra-high performance concrete and a preparation method thereof, wherein the dosage of a cementing material is 800-3Wherein the cement dosage is 450-650kg/m3. In addition, the prior art discloses a coarse aggregate-containing C210 strength grade ultrahigh-performance fiber concrete and a preparation method thereof, wherein the cementing material is 800kg/m3Above, the cement dosage is 600kg/m3The above. The cementing materials reported in foreign literatures are all 800kg/m when the ultrahigh-performance concrete is prepared3The above. The use amount of the cementing material in the design of the mixing ratio of the ultra-high performance concrete is higher, which not only causes higher production cost, but also causes higher hydration heat of cement in the pouring stage, causes cracking of the surface of the concrete, and affects the durability and the service life of the structure. The increase of the amount of cement in the cementitious material also causes great pressure on the environment, and the increase of the cement causes CO in the production process2Increased emission of CO in the atmosphere2The rising content not only causes global warming, but also influences the photosynthesis of plants and influences the ecological balance of the whole biosphere.
In addition, when preparing the ultra-high performance concrete, high-temperature curing, steam curing or high-pressure curing is usually adopted to improve the strength and the compactness of the concrete, which not only increases the preparation cost, but also has complex process and is not suitable for large-scale engineering application.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide an ultra-high performance concrete and a preparation method thereof, so as to solve the problems of high admixture amount and complex preparation process of the existing ultra-high performance concrete cementing material.
The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme.
The invention provides an ultra-high performance concrete which comprises the following components in parts by weight:
400 portions and 700 portions of cementing material;
aggregate 1500 + 2100 parts;
70-250 parts of steel fiber or 0.5-5 parts of PP fiber;
5-20 parts of a water reducing agent;
2-10 parts of a chemical auxiliary agent;
100 portions of water and 150 portions of water.
Preferably, the cement material of the ultra-high performance concrete comprises, by weight: 70% -90% of cement; 5% -15% of silica fume; 5 to 15 percent of fly ash.
Preferably, the ultra-high performance concrete, wherein the cement is selected from portland cements with grade number of 525 or more; the silica fume is SiO2Silica fume with content over 96% and activity index 99%; the fly ash is I-grade fly ash of a Chongqing Lopa sulphur power plant, wherein the activity index is 73%.
Preferably, in the ultra-high performance concrete, the aggregate includes coarse aggregate and fine aggregate; the coarse aggregate comprises 500-700 parts of limestone broken stone with the diameter of 10-20mm and 500-700 parts of limestone broken stone with the diameter of 5-10 mm; the fine aggregate comprises 300-400 parts of sand with the fineness modulus of 3.0-2.6 and 200-300 parts of sand with the fineness modulus of 2.2-1.6.
Preferably, the ultra-high performance concrete, wherein the length of the steel fiber is 10-15mm, and the equivalent diameter is 0.2-0.5 mm; the PP fiber has the length of 5-10mm and the equivalent diameter of 30-50 mu m.
Preferably, in the ultrahigh-performance concrete, the water reducing agent is selected from one of a polycarboxylic acid water reducing agent, a naphthalene water reducing agent, a fatty acid high-efficiency water reducing agent, a powdery polycarboxylate and casein.
Preferably, the auxiliary agent is prepared by mixing a defoaming agent, an air entraining agent and a waterproof agent according to the weight ratio of 1:1:1-1:3: 4.
Preferably, in the ultra-high performance concrete, the defoaming agent is an organic silicon defoaming agent or a polyether synthetic defoaming agent; the air entraining agent is selected from one of rosin resin, dodecyl sulfonate and alkylbenzene sulfonate; the waterproof agent is selected from one of sodium methylsiliconate, sodium ethylsilicononate and polyethyl hydroxy siloxane.
Preferably, the ultra-high performance concrete is one wherein the water is tap water.
The purpose of the invention and the technical problem to be solved are further realized by adopting the following technical scheme.
The preparation method of the ultra-high performance concrete provided by the invention comprises the following steps:
1) weighing the components according to the proportion, and firstly, uniformly stirring the water reducing agent, the chemical auxiliary agent and water to obtain an aqueous solution doped with the water reducing agent and the chemical auxiliary agent; dry-mixing the cementing material and the coarse and fine aggregates for 2-5min, adding the fibers, stirring for 2-5min until the fibers are uniformly dispersed, finally adding the water solution doped with the water reducing agent and the chemical auxiliary agent, and stirring for 3-6min until the uniformly mixed concrete mixture is obtained;
2) vibrating the concrete mixture for 2-5min until the surface of the concrete is discharged;
3) and (3) placing the vibrated material in a mold for molding, covering a plastic film on the surface of the test piece after molding, detaching the mold after 24 hours, taking out the test piece, and performing standard maintenance.
Preferably, in the preparation method, in step 1), the rotation speed of the dry mixing is 30-60r/min, preferably 40 r/min; the rotating speed of the stirring is 30-60r/min, and preferably 40 r/min.
Preferably, in the preparation method, the step 2) specifically includes: filling the concrete mixture into a mould for one time, vibrating, and vibrating for 2-5min until the concrete surface is discharged; the vibration frequency is 30-100 Hz.
Preferably, in the preparation method, the step 3) specifically includes: and (3) placing the vibrated material in a mold for molding, covering a plastic film on the surface of the test piece after molding, detaching the mold after 24 hours, taking out the test piece, and performing standard maintenance.
By the technical scheme, the ultra-high performance concrete and the preparation method thereof at least have the following advantages:
1. the amount of each component of the cementing material in the mixture ratio is reasonably designed, so that the amount of the cementing material is reduced as much as possible under the condition of meeting the requirement of the ultra-high performance concrete;
2. the ultra-high performance concrete prepared by the invention selects coarse and fine aggregates with different particle sizes, has reasonable particle size distribution, and can fully reduce the volume change of the concrete caused by dry shrinkage and wet expansion of a cementing material in the process of setting and hardening, thereby greatly contributing to the improvement of later strength and durability.
3. The ultra-high performance concrete prepared by the invention utilizes the fly ash and the silica fume as the admixture, and the microstructure of the admixture is spherical, so that the improvement of the flowability of the fresh concrete is facilitated.
4. The ultra-high performance concrete prepared by the invention adopts standard maintenance, has simple preparation method and can be suitable for large-scale cast-in-place.
5. The ultra-high performance concrete prepared by the invention can reduce the consumption of cementing materials under the condition of meeting the requirements of the ultra-high performance concrete, not only saves the cost, but also can protect the environment and realize the circular economy and sustainable development.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given to the concrete with ultra high performance and its preparation method, features and properties thereof according to the present invention with reference to the preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The following materials or reagents, unless otherwise specified, are all commercially available.
The invention provides an ultra-high performance concrete which comprises the following components in parts by weight:
400 portions and 700 portions of cementing material;
aggregate 1500 + 2100 parts;
70-250 parts of steel fiber or 0.5-5 parts of PP fiber;
5-20 parts of a water reducing agent;
2-10 parts of a chemical auxiliary agent;
100 portions of water and 150 portions of water.
In specific implementation, the cementing material may include, by weight: 70% -90% of cement; 5% -15% of silica fume; 5 to 15 percent of fly ash.
In specific embodiments, the cement may be selected from portland cements having a grade number of 525 or more; the silica fume may be SiO2Silica fume with content over 96% and activity index 99%; the fly ash can be I-grade fly ash of a Chongqing Lopa sulphur power plant, wherein the activity index is 73%, and the fly ash is arranged to be cooperated with other components to enable the concrete to achieve ultrahigh strength and ultrahigh durability.
In specific implementation, the aggregate can comprise coarse aggregate and fine aggregate; the coarse aggregate comprises 500-700 parts of limestone broken stone with the diameter of 10-20mm and 500-700 parts of limestone broken stone with the diameter of 5-10 mm; the fine aggregate may include 300-400 parts of sand having a modulus of fineness of 3.0-2.6 and 200-300 parts of sand having a modulus of fineness of 2.2-1.6, which are provided in order to achieve ultra-high strength and ultra-high durability of the concrete in cooperation with other components.
In specific implementation, the length of the steel fiber can be 10-15mm, and the equivalent diameter is 0.2-0.5 mm; the PP fiber has a length of 5-10mm and an equivalent diameter of 30-50 μm, and is arranged to achieve ultra-high strength and ultra-high durability of the concrete in cooperation with other components.
In specific implementation, the water reducing agent may be one selected from a polycarboxylate water reducing agent, a naphthalene water reducing agent, a fatty acid high-efficiency water reducing agent, a powdery polycarboxylate and casein, and is preferably a polycarboxylate water reducing agent or a naphthalene water reducing agent, and the arrangement is to cooperate with other components to enable the concrete to achieve ultrahigh strength and ultrahigh durability.
In specific implementation, the auxiliary agent can be obtained by mixing the defoaming agent, the air entraining agent and the waterproof agent according to the weight ratio of 1:1:1-1:3:4 (preferably 1:1:1), and the arrangement is to cooperate with other components to enable the concrete to achieve ultrahigh strength and ultrahigh durability. Preferably, the defoaming agent can be a silicone defoaming agent or a polyether synthetic defoaming agent; the air entraining agent is selected from one of rosin resin, dodecyl sulfonate and alkylbenzene sulfonate; the waterproof agent is selected from one of sodium methylsiliconate, sodium ethylsilicononate and polyethyl hydroxy siloxane, and is arranged to cooperate with other components to enable the concrete to achieve ultrahigh strength and ultrahigh durability.
In a specific embodiment, the water is tap water.
The preparation method of the ultra-high performance concrete comprises the following steps:
1) weighing the components according to the proportion, and firstly, uniformly stirring the water reducing agent, the chemical auxiliary agent and water to obtain an aqueous solution doped with the water reducing agent and the chemical auxiliary agent; dry-mixing the gelled material and the coarse and fine aggregates for 2-5min (30-60r/min, preferably 40r/min), then adding the fibers, stirring for 2-5min (30-60r/min, preferably 40r/min) until the fibers are uniformly dispersed, finally adding the water solution doped with the water reducing agent and the chemical auxiliary agent, and stirring for 3-6min (30-60r/min, preferably 40r/min) until the uniformly mixed concrete mixture is obtained;
2) filling the concrete mixture into a mould once, vibrating (the frequency is 30-100Hz), and vibrating for 2-5min until the surface of the concrete is discharged;
3) and (3) placing the vibrated material in a mold for molding, covering a plastic film on the surface of the test piece after molding, detaching the mold after 24 hours, taking out the test piece, and performing standard maintenance.
The present invention is further illustrated by the following specific examples, which are not to be construed as limiting the invention thereto.
Example 1
The embodiment provides an ultrahigh-performance concrete which comprises the following components in parts by weight: 400 parts of portland cement with the grade number of 525, 100 parts of silica fume and 100 parts of fly ash; 400 parts of limestone crushed stone with the diameter of 10-20mm and 500 parts of limestone crushed stone with the diameter of 5-10 mm; 300 parts of medium sand with the fineness modulus of 3.0-2.3 and 300 parts of fine sand with the fineness modulus of 2.2-1.6; 90 parts of steel fiber with the length of 10mm and the equivalent diameter of 0.2 mm; 10 parts of a polycarboxylic acid high-efficiency water reducing agent; 2 parts of defoaming agent, air entraining agent and waterproofing agent respectively; 150 parts of tap water.
The preparation method of the low-cementitious material ultra-high performance concrete in the embodiment comprises the following steps:
firstly, mixing: and (3) adding the cementing material and the coarse and fine aggregates into a concrete mixer (45 revolutions per minute) and dry-mixing for 3 minutes. Then adding the fiber and stirring for 3min, finally adding the water solution doped with the water reducing agent and the chemical auxiliary agent, and stirring for 3min to obtain the uniform concrete mixture.
And secondly, forming and vibrating, namely, filling the concrete mixture into a mold (the size of a pressure-resistant mold is 100 × 100 and 100 × 100mm, and the size of a fracture-resistant mold is 100 × 100 and 100 × 400mm) at one time, vibrating (the vibration frequency is 50Hz), and vibrating for about 40s until the surface of the concrete is discharged.
Step three, maintenance: covering a plastic film on the surface of the test piece after molding, detaching the mold after 24h, taking out the test piece, placing the test piece under standard conditions (the temperature is 20-25 ℃, and the humidity is 80% -90%) for curing for 28d, and testing to obtain the concrete with the compressive strength of 108.5MPa and the flexural strength of 18.5MPa according to detection data.
Example 2
The embodiment provides a low-cementing-material ultra-high-performance concrete which comprises the following components in parts by weight: 450 parts of portland cement with the grade number of 525, 100 parts of silica fume and 50 parts of fly ash; 500 parts of limestone crushed stone with the diameter of 10-20mm and 600 parts of limestone crushed stone with the diameter of 5-10 mm; 300 parts of medium sand with the fineness modulus of 3.0-2.3 and 300 parts of fine sand with the fineness modulus of 2.2-1.6; 3 parts of PP fiber with the length of 9mm and the equivalent diameter of 40 mu m; 15 parts of a polycarboxylic acid high-efficiency water reducing agent; 1.5 parts of defoaming agent, air entraining agent and waterproofing agent respectively; 120 parts of tap water.
The preparation method of the low-cementitious material ultra-high performance concrete in the embodiment comprises the following steps:
firstly, mixing: and (3) adding the cementing material and the coarse and fine aggregates into a concrete mixer (45 revolutions per minute) and dry-mixing for 3 minutes. Then adding the fiber and stirring for 3min, finally adding the water solution doped with the water reducing agent and the chemical auxiliary agent, and stirring for 3min to obtain the uniform concrete mixture.
And secondly, forming and vibrating, namely, filling the concrete mixture into a mold (the size of a pressure-resistant mold is 100 × 100 and 100 × 100mm, and the size of a fracture-resistant mold is 100 × 100 and 100 × 400mm) at one time, vibrating (the vibration frequency is 50Hz), and vibrating for about 40s until the surface of the concrete is discharged.
Step three, maintenance: covering a plastic film on the surface of the test piece after molding, detaching the mold after 24h, taking out the test piece, placing the test piece under standard conditions (the temperature is 20-25 ℃, and the humidity is 80% -90%) for curing for 28d, and testing to obtain that the compressive strength and the flexural strength of the concrete are 123.3MPa and 19.7MPa respectively through detection data.
Example 3
The embodiment provides a low-cementing-material ultra-high-performance concrete which comprises the following components in parts by weight: 500 parts of ordinary Portland cement with grade number of 62.5, 100 parts of silica fume and 100 parts of fly ash; 600 parts of limestone crushed stone with the diameter of 10-20mm and 600 parts of limestone crushed stone with the diameter of 5-10 mm; 350 parts of medium sand with the fineness modulus of 3.0-2.3 and 300 parts of fine sand with the fineness modulus of 2.2-1.6; 156 parts of steel fiber with the length of 15mm and the equivalent diameter of 0.5 mm; 20 parts of a polycarboxylic acid high-efficiency water reducing agent; 2 parts of defoaming agent, air entraining agent and waterproofing agent respectively; 120 parts of tap water.
The preparation method of the low-cementitious material ultra-high performance concrete in the embodiment comprises the following steps:
firstly, mixing: and (3) adding the cementing material and the coarse and fine aggregates into a concrete mixer (45 revolutions per minute) and dry-mixing for 3 minutes. Then adding the fiber and stirring for 3min, finally adding the water solution doped with the water reducing agent and the chemical auxiliary agent, and stirring for 3min to obtain the uniform concrete mixture.
And secondly, forming and vibrating, namely, filling the concrete mixture into a mold (the size of a pressure-resistant mold is 100 × 100 and 100 × 100mm, and the size of a fracture-resistant mold is 100 × 100 and 100 × 400mm) at one time, vibrating (the vibration frequency is 50Hz), and vibrating for about 40s until the surface of the concrete is discharged.
Step three, maintenance: covering a plastic film on the surface of the test piece after molding, detaching the mold after 24h, taking out the test piece, placing the test piece under standard conditions (the temperature is 20-25 ℃, and the humidity is 80% -90%) for curing for 28d, and testing to obtain that the compressive strength and the flexural strength of the concrete are 146.5MPa and 20.6MPa respectively through detection data.
Example 4
The embodiment provides a low-cementing-material ultra-high-performance concrete which comprises the following components in parts by weight: 400 parts of ordinary Portland cement with grade number of 62.5, 100 parts of silica fume and 100 parts of fly ash; 550 parts of limestone crushed stone with the diameter of 10-20mm and 550 parts of limestone crushed stone with the diameter of 5-10 mm; 400 parts of medium sand with the fineness modulus of 3.0-2.3 and 300 parts of fine sand with the fineness modulus of 2.2-1.6; 3 parts of PP fiber with the length of 9mm and the equivalent diameter of 40 mu m; 22 parts of a polycarboxylic acid high-efficiency water reducing agent; 1 part of each of a defoaming agent, an air entraining agent and a waterproof agent; 130 parts of tap water.
The preparation method of the low-cementitious material ultra-high performance concrete in the embodiment comprises the following steps:
firstly, mixing: and (3) adding the cementing material and the coarse and fine aggregates into a concrete mixer (45 revolutions per minute) and dry-mixing for 3 minutes. Then adding the fiber and stirring for 3min, finally adding the water solution doped with the water reducing agent and the chemical auxiliary agent, and stirring for 3min to obtain the uniform concrete mixture.
And secondly, forming and vibrating, namely, filling the concrete mixture into a mold (the size of a pressure-resistant mold is 100 × 100 and 100 × 100mm, and the size of a fracture-resistant mold is 100 × 100 and 100 × 400mm) at one time, vibrating (the vibration frequency is 50Hz), and vibrating for about 40s until the surface of the concrete is discharged.
Step three, maintenance: covering a plastic film on the surface of the test piece after molding, detaching the mold after 24h, taking out the test piece, placing the test piece under standard conditions (the temperature is 20-25 ℃, and the humidity is 80% -90%) for curing for 28d, and testing to obtain that the compressive strength and the flexural strength of the concrete are 134.5MPa and 18.6MPa respectively through detection data.
Example 5
The embodiment provides a low-cementing-material ultra-high-performance concrete which comprises the following components in parts by weight: 300 parts of ordinary portland cement with the grade number of 52.5, 100 parts of silica fume and 50 parts of fly ash; 500 parts of limestone crushed stone with the diameter of 10-20mm and 500 parts of limestone crushed stone with the diameter of 5-10 mm; 400 parts of medium sand with the fineness modulus of 3.0-2.3 and 350 parts of fine sand with the fineness modulus of 2.2-1.6; 3 parts of PP fiber with the length of 9mm and the equivalent diameter of 40 mu m; 22 parts of a polycarboxylic acid high-efficiency water reducing agent; 1 part of each of a defoaming agent, an air entraining agent and a waterproof agent; 190 parts of tap water.
The preparation method of the low-cementitious material ultra-high performance concrete in the embodiment comprises the following steps:
firstly, mixing: and (3) adding the cementing material and the coarse and fine aggregates into a concrete mixer (45 revolutions per minute) and dry-mixing for 3 minutes. Then adding the fiber and stirring for 3min, finally adding the water solution doped with the water reducing agent and the chemical auxiliary agent, and stirring for 3min to obtain the uniform concrete mixture.
And secondly, forming and vibrating, namely, filling the concrete mixture into a mold (the size of a pressure-resistant mold is 100 × 100 and 100 × 100mm, and the size of a fracture-resistant mold is 100 × 100 and 100 × 400mm) at one time, vibrating (the vibration frequency is 50Hz), and vibrating for about 40s until the surface of the concrete is discharged.
Step three, maintenance: covering a plastic film on the surface of the test piece after molding, detaching the mold after 24h, taking out the test piece, placing the test piece under standard conditions (the temperature is 20-25 ℃, and the humidity is 80% -90%) for curing for 28d, and testing to obtain that the compressive strength and the flexural strength of the concrete are 104.3MPa and 14.6MPa respectively through detection data.
In the embodiments 1-5 of the invention, the ultra-high performance concrete is prepared by adopting the low-gel material, so that the production cost is greatly saved and the production efficiency is improved on the basis of not reducing the performances such as the strength of the concrete; fly ash and silica fume are selected as mineral admixture, so that the concrete still has better fluidity under the condition of lower water gel ratio. The activity of the silica fume and the activity of the fly ash are both high, the hydration reaction of the cement can be promoted, and a good grading relation can be formed between the silica fume and the aggregate, so that the concrete is compact, and the strength loss caused by low cement mixing amount is compensated. In addition, the addition of concrete admixtures such as air entraining agents, defoaming agents and water reducing agents also reduces the porosity of the concrete and improves its strength and durability. Compared with the prior art, the preparation method is simple, and the cement consumption is greatly reduced (the lowest cement consumption can be reduced to 300 kg/m)3) The strength reaches more than 100 MPa.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.
Claims (10)
1. The ultra-high performance concrete is characterized by comprising the following components in parts by weight:
400 portions and 700 portions of cementing material;
aggregate 1500 + 2100 parts;
70-250 parts of steel fiber or 0.5-5 parts of PP fiber;
5-20 parts of a water reducing agent;
2-10 parts of a chemical auxiliary agent;
100 portions of water and 150 portions of water.
2. The ultra-high performance concrete of claim 1, wherein the cementitious material comprises, in weight percent: 70% -90% of cement; 5% -15% of silica fume; 5 to 15 percent of fly ash.
3. The ultra-high performance concrete of claim 1, wherein said cement is selected from the group consisting of portland cements having a grade number of 525 or greater; the silica fume is SiO2Silica fume with content over 96% and activity index 99%; the fly ash is I-grade fly ash of a Chongqing Lopa sulphur power plant, wherein the activity index is 73%.
4. The ultra-high performance concrete of claim 1, wherein said aggregate comprises coarse aggregate and fine aggregate; the coarse aggregate comprises 500-700 parts of limestone broken stone with the diameter of 10-20mm and 500-700 parts of limestone broken stone with the diameter of 5-10 mm; the fine aggregate comprises 300-400 parts of sand with the fineness modulus of 3.0-2.6 and 200-300 parts of sand with the fineness modulus of 2.2-1.6.
5. The ultra high performance concrete of claim 1, wherein said steel fibers have a length of 10-15mm and an equivalent diameter of 0.2-0.5 mm; the PP fiber has the length of 5-10mm and the equivalent diameter of 30-50 mu m.
6. The ultra-high performance concrete of claim 1, wherein said water reducing agent is selected from one of a polycarboxylic acid water reducing agent, a naphthalene water reducing agent, a fatty acid-based superplasticizer, a powdered polycarboxylate, and casein.
7. The ultra-high performance concrete as claimed in claim 1, wherein the auxiliary agent is prepared by mixing a defoaming agent, an air entraining agent and a waterproofing agent according to the weight ratio of 1:1:1-1:3: 4; the water is tap water.
8. The ultra-high performance concrete according to claim 7, wherein the defoaming agent is a silicone defoaming agent or a polyether synthetic defoaming agent; the air entraining agent is selected from one of rosin resin, dodecyl sulfonate and alkylbenzene sulfonate; the waterproof agent is selected from one of sodium methylsiliconate, sodium ethylsilicononate and polyethyl hydroxy siloxane.
9. A method for preparing the ultra-high performance concrete according to any one of claims 1 to 8, comprising the steps of:
1) weighing the components according to the proportion, and firstly, uniformly stirring the water reducing agent, the chemical auxiliary agent and water to obtain an aqueous solution doped with the water reducing agent and the chemical auxiliary agent; dry-mixing the cementing material and the coarse and fine aggregates for 2-5min, adding the fibers, stirring for 2-5min until the fibers are uniformly dispersed, finally adding the water solution doped with the water reducing agent and the chemical auxiliary agent, and stirring for 3-6min until the uniformly mixed concrete mixture is obtained;
2) vibrating the concrete mixture for 2-5min until the surface of the concrete is discharged;
3) and (3) forming the vibrated material, covering a film on the surface of the formed material after forming, demoulding after 24 hours, and carrying out standard maintenance.
10. The preparation method of claim 9, wherein in step 1), the rotation speed of the dry mixing is 30-60 r/min; the rotating speed of the stirring is 30-60 r/min; the step 2) specifically comprises the following steps: filling the concrete mixture into a mould for one time, vibrating, and vibrating for 2-5min until the concrete surface is discharged; the vibration frequency is 30-100 Hz; the step 3) specifically comprises the following steps: and (3) placing the vibrated material in a mold for molding, covering a plastic film on the surface of the test piece after molding, detaching the mold after 24 hours, taking out the test piece, and performing standard maintenance.
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