CN116283148A - Steaming-free ultra-high-performance concrete for bridge pier body and preparation method thereof - Google Patents
Steaming-free ultra-high-performance concrete for bridge pier body and preparation method thereof Download PDFInfo
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- CN116283148A CN116283148A CN202310282422.1A CN202310282422A CN116283148A CN 116283148 A CN116283148 A CN 116283148A CN 202310282422 A CN202310282422 A CN 202310282422A CN 116283148 A CN116283148 A CN 116283148A
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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
-
- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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
-
- 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 discloses a non-autoclaved ultra-high performance concrete for bridge pier bodies and a preparation method thereof, wherein the concrete comprises 566-693 parts by weight of cement, 332-426 parts by weight of auxiliary cementing material, 600-700 parts by weight of fine aggregate, 700-800 parts by weight of coarse aggregate, 156-195 parts by weight of steel fiber, 25-34 parts by weight of water reducer and 164-184 parts by weight of water. The preparation method comprises the following steps: mixing cement, auxiliary cementing material and fine aggregate and coarse aggregate; uniformly mixing water and a water reducing agent, and then adding the mixture; finally adding steel fibers for stirring; and under the standard curing condition, the non-autoclaved ultra-high performance concrete for the bridge pier body is obtained. The working performance and the physical and mechanical properties of the ultra-high performance concrete can reach the physical and mechanical technical requirement standard of the bridge pier body.
Description
Technical Field
The invention relates to concrete and a preparation method thereof, in particular to steam-curing-free ultra-high-performance concrete for bridge pier bodies and a preparation method thereof.
Background
The bridge pier body is used as a bearing structure, the concrete material is required to have higher mechanical property and durability, the traditional multipurpose reinforced concrete is used as a main material for preparing bridge structures such as the bridge pier body, and the ultra-high performance concrete has excellent compression resistance and fracture resistance and higher elastic modulus to resist deformation.
The Du Jiegui of the patent CN217517339U provides an ultra-high performance concrete bridge connecting plate applied to a bridge, belonging to the invention aiming at a bridge structure; liu Muyu in CN13430919a discloses a pier structure based on light ultra-high performance concrete, and the invention is also directed to bridge structures. The application of the existing ultra-high performance concrete in the field of bridge engineering is mainly proposed for a bridge reinforcement method or for bridge structure improvement. In CN115611563A, zhang provides an ultra-high performance concrete for municipal bridges, and a preparation method for improving the performance of the ultra-high performance concrete by adopting an alkaline water agent containing an organic permeation component, an inorganic permeation component and a hydration catalyst component as an admixture is provided, so that the whole preparation period is longer, and the whole process for preparing the ultra-high performance concrete is more complicated; in CN111302733a, chen Lou et al propose a non-autoclaved ultra-high performance concrete for wet joints of bridges, which aims to improve shrinkage creep of shrinkage joints, but the compressive strength of 28d materials is only above 110MPa, the flexural strength is also only above 14MPa, and the physical and mechanical properties are low, so that the concrete is difficult to be used for bridge bearing structures.
The traditional ultra-high performance concrete member needs high-temperature steam curing to improve the mechanical property and the durability of the ultra-high performance concrete, but after the high-temperature steam curing, the ultra-high performance concrete may have strength collapse to cause cracks of the structure, and the steam curing-free ultra-high performance concrete can avoid the structural problem under subsequent service; meanwhile, the content of the ultra-high performance concrete coarse aggregate in the market is low, so that the preparation cost is greatly increased; and the existing bridge is mostly of reinforced concrete structure, and the maintenance cost after corrosion is high.
Disclosure of Invention
The invention aims to: the invention aims to provide the steam-curing-free ultra-high-performance concrete for the bridge pier body, which has excellent mechanical properties and is steam-curing-free;
the second purpose of the invention is to provide a preparation method of the steam-curing-free ultra-high-performance concrete for the bridge pier body.
The technical scheme is as follows: the invention relates to a non-autoclaved ultra-high performance concrete for bridge pier bodies, which comprises the following components in parts by weight:
wherein the auxiliary cementing material comprises fly ash and silica fume, or fly ash, silica fume and mineral powder or glass beads, wherein the weight ratio of the fly ash is 55% -70%.
Wherein the fine aggregate is natural river sand, and the fineness modulus is 2.3-3.0.
Wherein the coarse aggregate is basalt crushed stone, the grain size of the aggregate is 5-10 mm, the mud content is less than or equal to 0.5%, the mixing amount of the coarse aggregate is more than or equal to that of the fine aggregate, and the fluidity and the elastic modulus of the ultra-high performance concrete are improved due to the low specific surface area of the coarse aggregate and the high elastic modulus of the coarse aggregate.
The water reducer is a polycarboxylate water reducer, the mass of the added water reducer accounts for 1.8-3.5% of the total mass of the cement and the auxiliary cementing material, and the water reducing rate and the solid content of the water reducer are determined specifically.
Wherein the section diameter of the steel fiber is 0.18-0.22 mm, the fiber length is 19-21 mm, and the length-diameter ratio is 90-110.
The steel fiber is in an end hook shape, the tensile strength is more than or equal to 2000MPa, and the steel fiber is different from a straight steel fiber used at ordinary times, so that the flexural strength and the fracture toughness of the ultra-high-performance concrete can be effectively improved, and the influence on the working performance of the concrete is smaller compared with that of the straight steel fiber.
Wherein the cement is PII52.5 cement.
The preparation method of the steaming-free ultra-high-performance concrete for the bridge pier body comprises the following steps of:
(1) Mixing and stirring cement, auxiliary cementing material, coarse aggregate and fine aggregate;
(2) Mixing water and a water reducing agent, slowly adding the mixture, and continuously stirring to form a concrete matrix;
(3) Slowly adding steel fibers into the concrete matrix, stirring, standing, demolding and curing to obtain the non-autoclaved ultra-high performance concrete for the bridge pier body.
Wherein in the steps (1), (2) and (3), the stirring mode is mechanical stirring; wherein the stirring rotating speed in the step (1) is 45-50r/min, and the stirring time is 3-4 min; the stirring speed in the step (2) is 45-50r/min, and the stirring time is 4-6 min; the stirring speed in the step (3) is 45-50r/min, and the stirring time is 5-8 min.
In the step (3), according to the concrete curing and test standard GB/T50081-2019 concrete physical and mechanical property test method standard, the concrete is formed and then is stood for 1 day, demoulding is carried out and is transferred into a standard curing room for curing for 28 days, the temperature of the curing room is controlled at 20+/-2 ℃, and the relative humidity is controlled at more than 95%.
The beneficial effects are that: compared with the prior art, the invention has the following remarkable effects: (1) The invention can meet the physical and mechanical properties and working properties required by the existing overhead bridge and the like, has higher fluidity and expansibility, can meet the requirements of large-volume bridge pier body site construction or prefabricated component preparation, and has a flat surface after molding and vibrating due to the high fluidity and expansibility so as to meet the requirements of pier body appearance. (2) The curing process of concrete is avoided under standard curing conditions, the electric energy and the heat energy of high-temperature steam curing are saved, the cost of ultra-high-performance concrete in the curing process is reduced, and the strength grade required by the pier body can be achieved under the condition of no curing. Because the physical and mechanical properties are higher, the risk that the traditional reinforced concrete bridge pier body is easy to crack, rust and the like can be made up, the maintenance cost is reduced, and the reinforced concrete bridge pier body can be applied to the building fields such as bridge pier bodies and the like. (3) In the invention, glass beads and the like are added into the auxiliary cementing material to serve as filling materials, so that the compactness of the ultra-high-performance concrete is improved, and meanwhile, the volume weight of the ultra-high-performance concrete can be effectively reduced. (4) The ultra-high performance concrete prepared by the method has the advantages that the content of the coarse aggregate is high, the fine aggregate is natural river sand, the manufacturing cost can be effectively reduced, and the specific surface area of the coarse aggregate is low and the elastic modulus is high because the content of the coarse aggregate is not less than the content of the fine aggregate, so that the fluidity and the elastic modulus of the ultra-high performance concrete are improved. (5) The prior patent is mainly aimed at the structural aspect of the bridge panel or the pier body, and the invention aims at the problem that the material for the bridge pier body is less, and can be used for filling the gap of the material.
Detailed Description
The present invention is described in further detail below.
Example 1
The raw materials of the invention are all commercially available. The cement material selected in the embodiment is PII52.5 type cement; the fly ash in the auxiliary cementing material is class I fly ash; the steel fibers are end hook type steel fibers with the length of 20 mm; the silica fume adopts high-quality silica fume, and the content of silica is higher than 95%; the mineral powder is S95 mineral powder; the water reducer is a high-efficiency polycarboxylate water reducer, and the water reducing rate is 30%. The ultra-high performance concrete of the embodiment is prepared by weighing the following materials in weight:
the auxiliary cementing material comprises 188 weight parts of fly ash, 94 weight parts of silica fume and 94 weight parts of mineral powder.
The preparation process comprises the following steps:
(1) 566 parts by weight of water, 376 parts by weight of auxiliary cementing material, 700 parts by weight of fine aggregate and 700 parts by weight of coarse aggregate are added into a concrete mixer and stirred for 4 minutes at a rotation speed of 45r/min, so that uniform dry blend is obtained.
(2) And uniformly stirring and mixing 25 parts by weight of the high-efficiency water reducer and 156 parts by weight of water, and slowly adding the mixture into a dry mixed material, wherein the rotation speed of a stirrer is 45r/min, and the stirring time is 4min, so that a concrete matrix with good flow property is formed.
(3) Slowly dispersing the steel fibers in parts by weight into a stirrer, and continuously stirring for 5min to ensure that the steel fibers are uniformly dispersed in the concrete matrix.
(4) And (3) standing for 1 day after the concrete is formed, transferring the concrete into a standard curing room for curing for 28 days, wherein the temperature of the curing room is controlled at 20+/-2 ℃, and the relative humidity is controlled to be more than 95%.
When the curing age reaches 28 days, the 28-day compressive strength, the flexural strength, the fracture toughness and the elastic modulus of the ultra-high performance concrete are tested according to the standard GB/T50081-2019 'physical and mechanical properties test method Standard of concrete', and the test results are shown in Table 1.
Example 2
The cement material selected in the embodiment is PII52.5 type cement; the fly ash in the auxiliary cementing material is class I fly ash; the steel fibers are end hook type steel fibers with the length of 20 mm; the silica fume adopts high-quality silica fume, and the content of silica is higher than 95%; the water reducing agent is a high-efficiency polycarboxylate water reducing agent, and the water reducing rate is 40%; the solid content was 20%. The ultra-high performance concrete of the embodiment is prepared by weighing the following materials in weight:
wherein, the auxiliary cementing material contains 250 parts by weight of fly ash and 82 parts by weight of silica fume.
The preparation process comprises the following steps:
(1) 693 parts by weight of cement, 332 parts by weight of auxiliary cementing material, 600 parts by weight of fine aggregate and 800 parts by weight of coarse aggregate are added into a concrete mixer and stirred for 3min at a rotation speed of 45r/min, so that a uniform dry blend is obtained.
(2) And (3) uniformly stirring and mixing 31 parts by weight of the high-efficiency water reducer and 164 parts by weight of water, and slowly adding the mixture into a dry mixed material, wherein the rotation speed of a stirrer is 45r/min, and the stirring time is 6min, so that a concrete matrix with good flow property is formed.
(3) Slowly dispersing the steel fibers in parts by weight into a stirrer, and continuously stirring for 8min to ensure that the steel fibers are uniformly dispersed in the concrete matrix.
(4) And (3) standing for 1 day after the concrete is formed, transferring the concrete into a standard curing room for curing for 28 days, wherein the temperature of the curing room is controlled at 20+/-2 ℃, and the relative humidity is controlled to be more than 95%.
When the curing age reaches 28 days, the 28-day compressive strength, the initial cracking strength, the flexural strength, the fracture toughness and the elastic modulus of the ultra-high performance concrete are tested according to the standard GB/T50081-2019 'physical and mechanical properties test method standard', and the test results are shown in Table 1.
Example 3
The cement material selected in the embodiment is PII52.5 type cement; the fly ash in the auxiliary cementing material is class I fly ash; the steel fibers are end hook type steel fibers with the length of 20 mm; the silica fume is high-quality silica fume, and the content of silica is higher than 95%; the water reducer is a high-efficiency polycarboxylate water reducer, and the solid content is 20%. The ultra-high performance concrete of the embodiment is prepared by weighing the following materials in weight:
the auxiliary cementing material comprises 200 parts by weight of fly ash, 82 parts by weight of silica fume and 50 parts by weight of glass beads.
The preparation process comprises the following steps:
(1) 693 parts by weight of cement, 332 parts by weight of auxiliary cementing material, 600 parts by weight of fine aggregate and 800 parts by weight of coarse aggregate are added into a concrete mixer and stirred for 3min at a rotation speed of 45r/min, so that a uniform dry blend is obtained.
(2) And (3) uniformly stirring and mixing 34 parts by weight of the high-efficiency water reducer and 164 parts by weight of water, and slowly adding the mixture into a dry mixed material, wherein the rotation speed of a stirrer is 45r/min, and the stirring time is 6min, so that a concrete matrix with good flow property is formed.
(3) Slowly dispersing the steel fibers in parts by weight into a stirrer, and continuously stirring for 6min to ensure that the steel fibers are uniformly dispersed in the concrete matrix.
(4) And (3) standing for 1 day after the concrete is formed, transferring the concrete into a standard curing room for curing for 28 days, wherein the temperature of the curing room is controlled at 20+/-2 ℃, and the relative humidity is controlled to be more than 95%.
When the curing age reaches 28 days, the 28-day compressive strength, the flexural strength, the fracture toughness and the elastic modulus of the ultra-high performance concrete are tested according to the standard GB/T50081-2019 'physical and mechanical properties test method Standard of concrete', and the test results are shown in Table 1.
Example 4
The cement material selected in the embodiment is PII52.5 type cement; the fly ash in the auxiliary cementing material is class I fly ash; the steel fibers are end hook type steel fibers with the length of 20 mm; the silica fume is high-quality silica fume, and the content of silica is higher than 95%; the water reducer is a high-efficiency polycarboxylate water reducer, and the solid content is 20%. The ultra-high performance concrete of the embodiment is prepared by weighing the following materials in weight:
the auxiliary cementing material comprises 200 parts by weight of fly ash, 125 parts by weight of silica fume and 51 parts by weight of glass beads.
The preparation process comprises the following steps:
(1) 598 parts by weight of cement, 426 parts of auxiliary cementing material, 600 parts by weight of fine aggregate and 800 parts by weight of coarse aggregate are added into a concrete mixer and stirred for 4 minutes at a rotation speed of 45r/min, so that uniform dry blend is obtained.
(2) And (3) uniformly stirring and mixing 31 parts by weight of the high-efficiency water reducer and 164 parts by weight of water, and slowly adding the mixture into a dry mixed material, wherein the rotation speed of a stirrer is 45r/min, and the stirring time is 6min, so that a concrete matrix with good flow property is formed.
(3) Slowly dispersing the steel fibers in parts by weight into a stirrer, and continuously stirring for 8min to ensure that the steel fibers are uniformly dispersed in the concrete matrix.
(4) And (3) standing for 1 day after the concrete is formed, transferring the concrete into a standard curing room for curing for 28 days, wherein the temperature of the curing room is controlled at 20+/-2 ℃, and the relative humidity is controlled to be more than 95%.
When the curing age reaches 28 days, the 28-day compressive strength, the flexural strength, the fracture toughness and the elastic modulus of the ultra-high performance concrete are tested according to the standard GB/T50081-2019 'physical and mechanical properties test method Standard of concrete', and the test results are shown in Table 1.
TABLE 1 specific physical and mechanical Properties of examples 1-4
| Example 1 | Example 2 | Example 3 | Example 4 | |
| Expansion degree/mm | 600 | 580 | 590 | 440 |
| Weight of volume Kg/m3 | 2652 | 2630 | 2632 | 2581 |
| Compressive Strength/MPa | 140.19 | 166.93 | 165.24 | 152.89 |
| Flexural Strength/MPa | 18.59 | 20.78 | 19.10 | 21.26 |
| Fracture toughness KJ/m 2 | 17.41 | 18.50 | 17.93 | 18.97 |
| Elastic modulus GPa | 49.23 | 53.35 | 53.04 | 52.56 |
Claims (10)
1. The non-autoclaved ultra-high performance concrete for the bridge pier body is characterized by comprising the following components in parts by weight:
2. the non-autoclaved ultra-high performance concrete for a bridge pier body according to claim 1, wherein the auxiliary cementing material comprises fly ash and silica fume, or coal ash, silica fume, mineral powder or glass beads.
3. The non-autoclaved ultra-high performance concrete for a bridge pier body according to claim 2, wherein the mass of the fly ash accounts for 55% -70% of the total mass of the auxiliary cementing material.
4. The non-autoclaved ultra-high performance concrete for a bridge pier body according to claim 1, wherein the fine aggregate is natural river sand, and the fineness modulus is 2.3-3.0.
5. The non-autoclaved ultra-high performance concrete for bridge pier bodies according to claim 1, wherein the coarse aggregate is basalt crushed stone, the particle size of the aggregate is 5-10 mm, and the mud content is less than or equal to 0.5%.
6. The non-autoclaved ultra-high performance concrete for bridge pier bodies according to claim 1, wherein the water reducer is a polycarboxylate water reducer, and the added water reducer accounts for 1.8% -3.5% of the total mass of cement and auxiliary cementing material.
7. The non-autoclaved ultra-high performance concrete for a bridge pier body according to claim 1, wherein the cross-section diameter of the steel fiber is 0.18-0.22 mm, the fiber length is 19-21 mm, and the length-diameter ratio is 90-110.
8. The non-autoclaved ultra-high performance concrete for a bridge pier body as recited in claim 1, wherein said steel fiber is shaped as an end hook.
9. The non-autoclaved ultra-high performance concrete for a bridge pier body as recited in claim 1, wherein said cement is PII52.5 cement.
10. A method for preparing the steam curing-free ultra-high-performance concrete for the bridge pier body according to claim 1, which is characterized by comprising the following steps:
(1) Mixing and stirring cement, auxiliary cementing material, coarse aggregate and fine aggregate;
(2) Mixing water and a water reducing agent, slowly adding the mixture, and continuously stirring to form a concrete matrix;
(3) Slowly adding steel fibers into the concrete matrix, stirring, standing, demolding and curing to obtain the non-autoclaved ultra-high performance concrete for the bridge pier body.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116947430A (en) * | 2023-08-07 | 2023-10-27 | 河北拓创远威科技有限公司 | Steel fiber imitated ultra-high performance concrete and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116947430A (en) * | 2023-08-07 | 2023-10-27 | 河北拓创远威科技有限公司 | Steel fiber imitated ultra-high performance concrete and preparation method thereof |
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