CN114751705B - High-performance self-compacting concrete and preparation method thereof - Google Patents
High-performance self-compacting concrete and preparation method thereof Download PDFInfo
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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
- C04B28/06—Aluminous 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/60—Flooring materials
- C04B2111/62—Self-levelling compositions
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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
Abstract
The invention relates to a high-performance self-compacting concrete and a preparation method thereof, and the high-performance self-compacting concrete comprises 40-90 parts of high belite sulphoaluminate cement, 5-40 parts of anhydrous calcium sulphoaluminate clinker, 1-15 parts of gypsum, 5-15 parts of fly ash, 0.3-1.5 parts of a water reducing agent, 0.02-0.1 part of an early strength agent, 0.1-5 parts of fiber, 0-1 part of a retarder, 0.05-5 parts of a stabilizer, 0.02-0.5 part of a defoaming agent, 24-35 parts of water, 60-300 parts of fine aggregate and 80-200 parts of coarse aggregate. The material has good self-compaction performance and high volume stability, can be quickly hardened in a negative temperature environment of minus 5 ℃, and is simple and convenient to construct.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to high-performance self-compacting concrete and a preparation method thereof.
Background
Compared with common concrete, the self-compacting concrete has good working performance, can be automatically filled and molded, is widely applied to structures with complex shapes, thin walls and dense reinforcing bars because of no need of vibration, can greatly shorten the concrete pouring time, obviously reduce the labor intensity of workers, improve the production efficiency and increase the application fields of the self-compacting concrete. However, self-compacting concrete has high gas content (usually large bubbles), large shrinkage, low strength after hardening, and poor durability, and is more susceptible to breakage, especially in cold weather conditions.
The patent CN 108358562A discloses a micro-expansion high-performance low-air-content self-compacting concrete and a preparation method thereof, the micro-expansion high-performance low-air-content self-compacting concrete is composed of portland cement, fly ash, mineral powder, coarse aggregate, fine aggregate, an expanding agent, a special additive, an internal curing agent and mixing water, and is particularly suitable for arch rib section increasing engineering of a hyperbolic arch bridge, but rapid hardening cannot be realized, the strength in middle and later stages is low, and the strength in 28 days is lower than 50MPa. The patent CN 111704432A discloses a high-performance self-compacting concrete for rapid rush-repair and a preparation method and application thereof, the self-compacting concrete is prepared by compounding special cement and ordinary portland cement, and has the characteristics of super early strength, no shrinkage, high workability and the like.
Disclosure of Invention
The invention aims to provide a high-performance self-compacting concrete material, the concrete mixture of which has good filling performance, high volume stability, no micro-expansion shrinkage, rapid setting and hardening under the negative temperature environment of 5 ℃ below zero, and the middle and later strength is still obviously increased.
The second purpose of the invention is to provide a preparation method of the high-performance self-compacting concrete.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a high-performance self-compacting concrete material, which comprises the following raw materials in parts by weight:
40 to 90 portions of high belite sulphoaluminate cement, 5 to 40 portions of anhydrous calcium sulphoaluminate clinker, 1 to 15 portions of gypsum, 5 to 15 portions of fly ash, 0.3 to 1.5 portions of water reducing agent, 0.02 to 0.1 portion of early strength agent, 0.1 to 5 portions of fiber, 0 to 1 portion of retarder, 0.05 to 5 portions of stabilizer, 0.02 to 0.5 portion of defoaming agent, 24 to 35 portions of water, 60 to 300 portions of fine aggregate and 80 to 200 portions of coarse aggregate.
The total weight part of the high belite sulphoaluminate cement, the anhydrous calcium sulphoaluminate clinker, the gypsum and the fly ash is 100 parts.
Preferably, the rapid repair material comprises the following raw materials in parts by weight:
60-85 parts of high belite sulphoaluminate cement, 7-25 parts of anhydrous calcium sulphoaluminate clinker, 2-9 parts of gypsum, 5-10 parts of fly ash, 0.4-1.2 parts of water reducing agent, 0.04-0.08 part of early strength agent, 0.2-4 parts of fiber, 0.1-0.6 part of retarder, 0.06-2 parts of stabilizer, 0.05-0.1 part of defoaming agent, 26-32 parts of water, 80-200 parts of fine aggregate and 90-180 parts of coarse aggregate.
The total weight portion of the high belite sulphoaluminate cement, the anhydrous calcium sulphoaluminate clinker, the gypsum and the fly ash is 100 portions.
The high belite sulphoaluminate cement has the strength grade of not less than 42.5 and the specific surface area of not less than 450m 2 /kg。
The gypsum is one or a mixture of anhydrous gypsum and hemihydrate gypsum, and preferably anhydrous gypsum.
The fly ash is at least one of I-grade fly ash, II-grade fly ash or ultrafine fly ash, and preferably I-grade fly ash.
The water reducing agent is at least one of a polycarboxylic acid high-performance water reducing agent, a melamine high-performance water reducing agent and a naphthalene high-performance water reducing agent, and preferably a polycarboxylic acid high-performance water reducing agent.
The early strength agent is at least one of lithium carbonate, lithium hydroxide, lithium chloride, calcium nitrite or calcium formate.
The fiber is one or two or more of polypropylene fiber, polyvinyl alcohol fiber, glass fiber or steel fiber.
The retarder is at least one of sodium citrate, citric acid, borax, boric acid and sodium gluconate.
The stabilizer is a fine powder material processed by a water-soluble high molecular polymer, an inorganic material and the like, the water-soluble high molecular polymer is one of low-viscosity cellulose ether, starch ether or xanthan gum, and the inorganic material is at least one of calcium aluminosilicate, bentonite and nano silicon dioxide.
The defoaming agent is polyether modified silicon defoaming agent, polyether defoaming agent and organic silicon defoaming agent, preferably polyether modified silicon defoaming agent.
The fine aggregate is composed of quartz sand with the grain sizes of three types, namely No. 3 sand, no. 5 sand and No. 6 sand, wherein the grain size of the No. 3 quartz sand is 1-3mm, the grain size of the No. 5 sand is 0.3-1.2mm, the grain size of the No. 6 sand is 0.075-0.6 mm, and the weight ratio of the three types of quartz sand is 3:3:4.
the coarse aggregate is quartz stone, basalt or limestone with the particle size of 5-10 mm, the needle flake particle content of the coarse aggregate is less than 8% of the total weight, and the quartz stone is preferred.
The invention also provides a preparation method of the high-performance self-compacting concrete, which comprises the following steps:
1. the preparation method of the anhydrous calcium sulphoaluminate clinker comprises the following steps: firstly, respectively grinding limestone, bauxite and dihydrate gypsum to 180 meshes, wherein the pass rate is more than 90%, and then, mixing the three raw materials according to the weight ratio of 10: (6-10): (3-5) mixing evenly in a planetary mill, adding water accounting for 10 percent of the weight of the three raw materials, mixing evenly, and pressing by a steel die
The test block is dried at 105 ℃, and finally the test block is calcined at 1300 ℃ for 1 hour and cooled to room temperature to obtain the anhydrous calcium sulphoaluminate clinker.
2. Mixing anhydrous calcium sulphoaluminate clinker and gypsum according to the weight ratio of 1: (0.2-0.4) and grinding until the specific surface area reaches 400-500 m 2 /kg。
3. And weighing the materials except the retarder and the defoaming agent in proportion, and pouring the materials into a mixing device to be stirred for more than 5 min.
4. And (3) mixing the retarder and the defoaming agent into water, fully and uniformly mixing, then pouring into the mixture obtained in the step (3), and continuously stirring for 3min to obtain the high-performance self-compacting concrete.
The high-performance self-compacting concrete provided by the invention has the following advantages and use effects:
1. the filling performance of the concrete mixture is very good, the slump expansion performance grade can meet SF2, the clearance passing performance grade can reach PA2, the segregation resistance performance grade reaches SR1, and the self-compacting performance and requirements are described in the technical specification for self-compacting concrete application (JGJ/T283-2012).
2. The rapid setting and hardening can be realized in an environment of-5 ℃, the traffic is opened for 2h, the hour strength is very excellent, the later strength can also be stably increased without reverse shrinkage.
3. The volume stability is good, the micro-expansion does not shrink, the crack resistance is good, and the surface of the concrete is uniform and has no bubbles.
4. The construction is simple and convenient, vibration is not needed, a concrete structure with dense reinforcing bars can be automatically filled, and special heat preservation measures are not needed in winter construction.
Detailed Description
The present invention will be described in detail with reference to specific examples.
The invention discloses a high-performance self-compacting concrete, which comprises the following raw materials, by weight, 40-90 parts of high belite sulphoaluminate cement, 5-40 parts of anhydrous calcium sulphoaluminate clinker, 1-15 parts of gypsum, 5-15 parts of fly ash, 0.3-1.5 parts of a water reducing agent, 0.02-0.1 part of an early strength agent, 0.1-5 parts of fibers, 0-1 part of a retarder, 0.05-5 parts of a stabilizer, 0.02-0.5 part of a defoaming agent, 24-35 parts of water, 60-300 parts of fine aggregates and 80-200 parts of coarse aggregates. The high-performance self-compacting concrete has excellent filling performance, can automatically fill a concrete structure with dense reinforcing bars, can realize quick hardening in a negative temperature environment, can ensure longer operable time at higher temperature, has good volume stability, extremely low drying shrinkage rate or micro-expansion and strong crack resistance.
Unless otherwise specified, the high belite sulphoaluminate cement disclosed by the invention has a strength grade of 42.5 and the physical properties thereof meet the following requirements: the specific surface area is more than or equal to 450m 2 The initial setting is more than or equal to 15min, the final setting is less than or equal to 45min, the free expansion rate of 28d is less than or equal to 0.08 percent (in water), and the free expansion rate of 28d is more than or equal to-0.05 percent (in air); the bending strength of the steel sheets at 4h, 7d and 28d should be not less than 4.0MPa, 5.0MPa and 6.0MPa respectively, and the bending strength of the steel sheets at 4h, 7d and 28d should be not less than 12.5MPa, 32.5MPa and 42.5MPa respectively.
If not specifically stated, the fine aggregate in the invention is composed of three kinds of quartz sand with different particle sizes of No. 3 sand, no. 5 sand and No. 6 sand, the particle size of No. 3 quartz sand is 1-3 mm, the particle size of No. 5 sand is 0.3-1.2mm, the particle size of No. 6 sand is 0.075-0.6 mm, the weight ratio of the three kinds of quartz sand is 3:3:4. quartz stone with the grain diameter of 5-10 mm as coarse aggregate has hard texture and full and round appearance, and has needle-sheet particle content less than 8 wt% and stone powder content less than 2 wt%.
The invention also discloses a preparation method of the high-performance self-compacting concrete, which comprises the following steps:
1. the preparation method of the anhydrous calcium sulphoaluminate clinker comprises the following steps: first limestoneThe three raw materials of the bauxite and the dihydrate gypsum are respectively ground to 180 meshes, the passing rate is more than 90%, and then the three raw materials of the limestone, the bauxite and the dihydrate gypsum are mixed according to the ratio of 10: (6-10): (3-5) mixing evenly in a planetary mill, adding water accounting for 10 percent of the total weight of the three raw materials, mixing evenly, and pressing by a steel die
The test block is dried at 105 ℃, and finally the test block is calcined at 1300 ℃ for 1 hour and cooled to room temperature to obtain the anhydrous calcium sulphoaluminate clinker.
2. Mixing anhydrous calcium sulphoaluminate clinker and gypsum according to the weight ratio of 1: (0.2-0.4) and grinding until the specific surface area reaches 400-500 m 2 /kg。
3. And weighing the materials except the retarder and the defoaming agent in proportion, and pouring the materials into a mixing device to be stirred for more than 5 min.
4. And (3) mixing the retarder and the defoaming agent into water, fully and uniformly mixing, then pouring into the mixture obtained in the step (3), and continuously stirring for 3min to obtain the high-performance self-compacting concrete.
Example 1
A high-performance self-compacting concrete comprises the following raw materials in parts by weight:
85 parts of high belite sulphoaluminate cement, 8 parts of anhydrous calcium sulphoaluminate clinker, 2 parts of gypsum, 5 parts of fly ash, 0.4 part of water reducing agent, 0.05 part of early strength agent, 0.2 part of fiber, 0.1 part of retarder, 1 part of stabilizer, 0.05 part of defoaming agent, 26 parts of water, 100 parts of fine aggregate and 130 parts of coarse aggregate. The gypsum is anhydrous gypsum, the fly ash is I-grade fly ash, the water reducing agent is a polycarboxylic acid high-performance water reducing agent, the early strength agent is lithium carbonate, the fiber is polypropylene fiber, the retarder is sodium citrate, and the stabilizer is low-viscosity cellulose ether, bentonite and calcium aluminosilicate, wherein the weight ratio of the three materials is 1:10:10, the defoaming agent is polyether modified silicon defoaming agent, and the water is tap water.
Example 2
A high-performance self-compacting concrete comprises the following raw materials in parts by weight:
80 parts of high belite sulphoaluminate cement, 11 parts of anhydrous calcium sulphoaluminate clinker, 4 parts of gypsum, 5 parts of fly ash, 1.5 parts of water reducing agent, 0.04 part of early strength agent, 2 parts of fiber, 0.3 part of retarder, 0.9 part of stabilizer, 0.02 part of defoaming agent, 29 parts of water, 110 parts of fine aggregate and 150 parts of coarse aggregate. The gypsum is anhydrous gypsum, the fly ash is I-grade fly ash, the water reducing agent is a melamine high-efficiency water reducing agent, the early strength agent is lithium hydroxide, the fiber is a fine steel fiber, the retarder is boric acid, and the stabilizer is low-viscosity cellulose ether, bentonite and calcium aluminosilicate, wherein the weight ratio of the three materials is 1:10:10, the defoaming agent is a polyether modified silicon defoaming agent, and the water is tap water.
Example 3
A high-performance self-compacting concrete comprises the following raw materials in parts by weight:
50 parts of high belite sulphoaluminate cement, 25 parts of anhydrous calcium sulphoaluminate clinker, 10 parts of gypsum, 15 parts of fly ash, 0.5 part of water reducing agent, 0.02 part of early strength agent, 1 part of fiber, 0.6 part of retarder, 0.1 part of stabilizer, 0.1 part of defoaming agent, 31 parts of water, 170 parts of fine aggregate and 180 parts of coarse aggregate. The gypsum is anhydrous gypsum, the fly ash is I-grade fly ash, the water reducing agent is a polycarboxylic acid high-performance water reducing agent, the early strength agent is lithium carbonate, the fiber is fine-wire steel fiber, the retarder is boric acid, and the stabilizer is low-viscosity cellulose ether and nano-silica according to the weight ratio of 1:5, the defoaming agent is a polyether defoaming agent, and the water is tap water.
Example 4
A high-performance self-compacting concrete comprises the following raw materials in parts by weight:
70 parts of high belite sulphoaluminate cement, 15 parts of anhydrous calcium sulphoaluminate clinker, 5 parts of gypsum, 10 parts of fly ash, 0.5 part of water reducing agent, 0.05 part of early strength agent, 0.2 part of fiber, 0.2 part of retarder, 0.09 part of stabilizer, 0.08 part of defoaming agent, 30 parts of water, 150 parts of fine aggregate and 150 parts of coarse aggregate. The gypsum is anhydrous gypsum, the fly ash is I-grade fly ash, the water reducing agent is a polycarboxylic acid high-performance water reducing agent, the early strength agent is lithium carbonate, the fiber is polypropylene fiber, the retarder is citric acid, and the stabilizer is low-viscosity cellulose ether and nano-silica according to the weight ratio of 1:5, the defoaming agent is polyether defoaming agent, and the water is tap water.
Example 5
A high-performance self-compacting concrete comprises the following raw materials in parts by weight:
62 parts of high belite sulphoaluminate cement, 22 parts of anhydrous calcium sulphoaluminate clinker, 8 parts of gypsum, 8 parts of fly ash, 1.2 parts of water reducing agent, 0.06 part of early strength agent, 3 parts of fiber, 0.4 part of retarder, 0.3 part of stabilizer, 0.05 part of defoaming agent, 27 parts of water, 120 parts of fine aggregate and 130 parts of coarse aggregate. The gypsum is anhydrous gypsum, the fly ash is I-grade fly ash, the water reducing agent is a naphthalene-based high-efficiency water reducing agent, the early strength agent is lithium carbonate, the fiber is fine steel fiber, the retarder is sodium citrate, and the stabilizer is low-viscosity cellulose ether, bentonite and calcium aluminosilicate, wherein the weight ratio of the three materials is 1:10:10, the defoaming agent is polyether modified silicon defoaming agent, and the water is tap water.
Example 6
A high-performance self-compacting concrete comprises the following raw materials in parts by weight:
55 parts of high belite sulphoaluminate cement, 25 parts of anhydrous calcium sulphoaluminate clinker, 8 parts of gypsum, 12 parts of fly ash, 0.6 part of water reducing agent, 0.03 part of early strength agent, 0.3 part of fiber, 0.3 part of retarder, 1.5 parts of stabilizer, 0.05 part of defoaming agent, 28 parts of water, 130 parts of fine aggregate and 130 parts of coarse aggregate. The gypsum is anhydrous gypsum, the fly ash is I-grade fly ash, the water reducing agent is a polycarboxylic acid high-performance water reducing agent, the early strength agent is lithium carbonate, the fiber is a fine steel fiber, the retarder is sodium citrate, and the stabilizer is low-viscosity cellulose ether, bentonite and calcium aluminosilicate, wherein the weight ratio of the three materials is 1:10:10, the defoaming agent is polyether modified silicon defoaming agent, and the water is tap water.
Example 7
A high-performance self-compacting concrete comprises the following raw materials in parts by weight:
69 parts of high belite sulphoaluminate cement, 17 parts of anhydrous calcium sulphoaluminate clinker, 5 parts of gypsum, 9 parts of fly ash, 0.5 part of water reducing agent, 0.05 part of early strength agent, 0.2 part of fiber, 0.2 part of retarder, 1.2 parts of stabilizer, 0.06 part of defoaming agent, 25 parts of water, 100 parts of fine aggregate and 120 parts of coarse aggregate. The gypsum is anhydrous gypsum, the fly ash is I-grade fly ash, the water reducing agent is a polycarboxylic acid high-performance water reducing agent, the early strength agent is lithium carbonate, the fiber is a fine steel fiber, the retarder is sodium citrate, and the stabilizer is low-viscosity cellulose ether, bentonite and calcium aluminosilicate, wherein the weight ratio of the three materials is 1:10:10, the defoaming agent is polyether modified silicon defoaming agent, and the water is tap water.
Example 8
A high-performance self-compacting concrete comprises the following raw materials in parts by weight:
78 parts of high belite sulphoaluminate cement, 12 parts of anhydrous calcium sulphoaluminate clinker, 3 parts of gypsum, 7 parts of fly ash, 0.4 part of water reducing agent, 0.06 part of early strength agent, 0.2 part of fiber, 0.1 part of retarder, 2 parts of stabilizer, 0.04 part of defoaming agent, 29 parts of water, 130 parts of fine aggregate and 150 parts of coarse aggregate. The gypsum is anhydrous gypsum, the fly ash is I-grade fly ash, the water reducing agent is a polycarboxylic acid high-performance water reducing agent, the early strength agent is lithium carbonate, the fiber is glass fiber, the retarder is sodium citrate, and the stabilizer is low-viscosity cellulose ether, bentonite and calcium aluminosilicate, wherein the three materials are 1:10:10, the defoaming agent is polyether defoaming agent, and the water is tap water.
Comparative example 1
The anhydrous calcium sulphoaluminate clinker and retarder are not mixed, wherein the high belite sulphoaluminate cement is 80 parts, the gypsum is 15 parts, the fly ash is 5 parts, and the rest components are the same as example 2.
Comparative example 2
High belite sulphoaluminate cement and retarder are not blended, wherein 65 parts of anhydrous calcium sulphoaluminate clinker, 25 parts of gypsum, 10 parts of fly ash and the rest of the components are the same as in example 3.
Comparative example 3
The anhydrous calcium sulphoaluminate clinker, the gypsum and the retarder are not mixed, wherein the high belite sulphoaluminate cement accounts for 90 parts, the fly ash accounts for 10 parts, and the rest components are the same as example 1.
Comparative example 4
The gypsum is not mixed, wherein 80 parts of high belite sulphoaluminate cement, 10 parts of anhydrous calcium sulphoaluminate fly ash and the rest of the components are the same as those in example 2.
The test temperature for examples 1-8 and comparative examples 1-4 was 15 ℃ and the self-compaction and mechanical properties of the blends are shown in Table 1. The preparation schemes of the gelled materials of examples 9-12 are shown in Table 2, the fine aggregate is 80 parts, the coarse aggregate is 100 parts, no retarder is added, the parts of the other raw materials are the same as those of the example 7, the test environment temperature is minus 5 ℃, the flexural strength and the compressive strength of the gelled materials are tested for 2 hours, and the specific data are shown in Table 3.
In addition, the stabilizers of comparative examples 5 to 8 were low viscosity cellulose ether, bentonite, calcium aluminosilicate and nano silica, respectively, in amounts of 0.05 parts, 2 parts and 0.1 part, respectively, and the segregation rates tested were 22%, 27%, 26% and 25%, respectively.
As can be seen from tables 1 and 3, the self-compacting concrete prepared by using the ternary system of high belite sulphoaluminate cement, anhydrous calcium sulphoaluminate clinker and gypsum has very high early strength, and can be rapidly hardened even in an environment of minus 5 ℃, and when the unitary system of high belite sulphoaluminate cement and the binary system of anhydrous calcium sulphoaluminate and gypsum are used (namely comparative examples 1 to 4), the early strength of the self-compacting concrete is obviously lower than that of the concrete prepared by using the ternary systems of examples 1 to 8. In addition, according to our earlier studies, the material prepared by the binary system of high belite sulphoaluminate cement and rapid hardening sulphoaluminate cement can realize rapid hardening at low temperature, is a rapid repair material which can be used at the low temperature of 5 ℃, and has high early performance, for example, the bending strength and the compressive strength of 2h at the low temperature (5 ℃) are respectively as high as 4.6MPa and 41.3MPa (see ZL202010259007.0, the 0094 th and 0095 th paragraphs and Table 1 of the specific implementation mode thereof), but when the environmental temperature is reduced to be lower, the performance can not meet the application requirements any more. As shown in Table 2, the formulation of the cement in comparative example 9 and comparative example 10, the flexural strength and compressive strength of the cement were measured for 2 hours at-5 ℃ in the same manner as in examples 9 to 12 except that 0.05 part of the early strength agent in comparative example 10 was changed to 4 parts of the early strength accelerator. As can be seen from Table 3, even when the ambient temperature is as low as-5 ℃, the flexural strength at 2h is more than or equal to 3.0MPa and the compressive strength at 2h is more than 25.0MPa in examples 9-12, while the strength of the concrete prepared by adopting the binary system of the high belite sulphoaluminate cement and the fast hardening sulphoaluminate cement is obviously lower, the flexural strength at 2h is less than 1.0MPa and the compressive strength at 2h is less than 10.0MPa, and the phenomenon of edge deletion and corner falling exists in the demoulding process, so that the requirement of fast traffic opening can not be met. Meanwhile, the stabilizer compounded by the water-soluble high molecular polymer and the inorganic material obviously improves the anti-segregation performance of the concrete mixture, so that the material has higher slump expansion degree and lower segregation rate, wherein the slump expansion degree performance grade of the concrete mixture can meet SF2, the clearance passing performance grade can reach PA2, the anti-segregation performance grade can reach SR1, and the construction performance of the concrete mixture is beyond expectations.
TABLE 1
TABLE 2
TABLE 3
Note: (1) the slump expansion, clearance passing and segregation rate of the concrete mixture are tested according to the technical specification for self-compacting concrete application (JGJ/T283-2012);
(2) the concrete shrinkage test is carried out according to a T0574-2020 cement concrete shrinkage test method (contact method) in Highway engineering cement and cement concrete test regulations (JTG 3420-2020);
(3) the concrete flexural strength and compressive strength test is determined according to the concrete physical mechanical property test method standard (GB/T50081-2019), wherein the concrete flexural strength test block size is 100mm multiplied by 400mm, and the concrete compressive strength test block size is 100mm multiplied by 100mm.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The high-performance self-compacting concrete is characterized by comprising the following raw materials in parts by weight: 40-90 parts of high belite sulphoaluminate cement, 5-40 parts of anhydrous calcium sulphoaluminate clinker, 1-15 parts of gypsum, 5-15 parts of fly ash, 0.3-1.5 parts of water reducing agent, 0.02-0.1 part of early strength agent, 0.1-5 parts of fiber, 0~1 parts of retarder, 0.05-5 parts of stabilizer, 0.02-0.5 part of defoaming agent, 24-35 parts of water, 60-300 parts of fine aggregate and 80-200 parts of coarse aggregate; the stabilizer is a fine powdery material processed by a water-soluble high polymer and/or an inorganic material, the water-soluble high polymer is one of low-viscosity cellulose ether, starch ether or xanthan gum, and the inorganic material is at least one of calcium aluminosilicate, bentonite and nano silicon dioxide;
the total weight part of the high belite sulphoaluminate cement, the anhydrous calcium sulphoaluminate clinker, the gypsum and the fly ash is 100 parts;
the preparation method of the concrete comprises the following steps:
(1) The preparation method of the anhydrous calcium sulphoaluminate clinker comprises the following steps: firstly, respectively grinding limestone, bauxite and dihydrate gypsum to 180 meshes, wherein the pass rate is more than 90%, then uniformly mixing the three raw materials in a planetary mill, adding water accounting for 10% of the weight of the three raw materials, uniformly mixing, pressing the mixture into a test block with the diameter of 20mm multiplied by 10mm by using a steel die, drying the test block at the temperature of 105 ℃, finally calcining the test block at the temperature of 1300 ℃ for 1 hour, and cooling the test block to the room temperature to obtain anhydrous calcium sulphoaluminate clinker;
(2) Mixing anhydrous calcium sulphoaluminate clinker and gypsum according to the weight ratio of 1: (0.2 to 0.4)Uniformly mixing the components in proportion, and grinding the mixture until the specific surface area reaches 400-500m 2 /kg；
(3) Weighing the materials except the retarder and the defoaming agent in proportion, and pouring the materials into a mixing device to be stirred for more than 5 min;
(4) And (4) mixing the retarder and the defoaming agent into water, fully and uniformly mixing, then pouring into the mixture obtained in the step (3), and continuously stirring for 3min to obtain the high-performance self-compacting concrete.
2. The high-performance self-compacting concrete according to claim 1, characterized by comprising the following raw materials in parts by weight: 60 to 85 parts of high belite sulphoaluminate cement, 7 to 25 parts of anhydrous calcium sulphoaluminate clinker, 2 to 10 parts of gypsum, 5 to 10 parts of fly ash, 0.4 to 1.2 parts of water reducing agent, 0.04 to 0.08 part of early strength agent, 0.2 to 4 parts of fiber, 0.1 to 0.6 part of retarder, 0.06 to 2 parts of stabilizer, 0.05 to 0.1 part of defoamer, 26 to 32 parts of water, 80 to 200 parts of fine aggregate and 90 to 180 parts of coarse aggregate.
3. The high performance self-compacting concrete according to claim 1, wherein said high belite sulphoaluminate cement has a strength grade of not less than 42.5 and a specific surface area of not less than 450m 2 /kg。
4. The high performance self-compacting concrete according to claim 1, wherein the gypsum is one or a mixture of anhydrous gypsum and semi-hydrated gypsum, preferably anhydrous gypsum.
5. The high performance self-compacting concrete according to claim 1, wherein the fly ash is at least one of class I fly ash, class II fly ash or ultra-fine fly ash, preferably class I fly ash.
6. The high-performance self-compacting concrete according to claim 1, wherein the water reducing agent is at least one of a polycarboxylic acid high-performance water reducing agent, a melamine high-performance water reducing agent and a naphthalene high-performance water reducing agent, preferably a polycarboxylic acid high-performance water reducing agent; the early strength agent is at least one of lithium carbonate, lithium hydroxide, lithium chloride, calcium nitrite or calcium formate.
7. The high performance self-compacting concrete according to claim 1, wherein the fibers are one or two or more of polypropylene fibers, polyvinyl alcohol fibers, glass fibers, and steel fibers.
8. The high performance self-compacting concrete of claim 1, wherein the retarder is at least one of sodium citrate, citric acid, borax, boric acid, and sodium gluconate.
9. The high-performance self-compacting concrete according to claim 1, wherein the fine aggregate is composed of quartz sand with three different particle sizes of No. 3 sand, no. 5 sand and No. 6 sand, the particle size of No. 3 quartz sand is 1 to 3mm, the particle size of No. 5 sand is 0.3 to 1.2mm, the particle size of No. 6 sand is 0.075 to 0.6mm, and the weight ratio of the three kinds of quartz sand is 3:3:4; the coarse aggregate particles are quartz stone, basalt or limestone with the particle size of 5-10mm, the content of needle-shaped flaky particles of the coarse aggregate is less than 8% of the total weight, and the quartz stone is preferably selected.
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