CN113979712A - High-performance concrete with low shrinkage - Google Patents
High-performance concrete with low shrinkage Download PDFInfo
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- CN113979712A CN113979712A CN202111163154.9A CN202111163154A CN113979712A CN 113979712 A CN113979712 A CN 113979712A CN 202111163154 A CN202111163154 A CN 202111163154A CN 113979712 A CN113979712 A CN 113979712A
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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
- C04B28/14—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 calcium sulfate cements
- C04B28/16—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 calcium sulfate cements containing anhydrite, e.g. Keene's cement
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a high-performance concrete with low shrinkage, which comprises the following components in parts by weight: 150 portions and 260 portions of cement clinker powder; 100-150 parts of modified metakaolin; 30-50 parts of anhydrite powder; 300 portions and 500 portions of gravel; 150 portions and 220 portions of coal ash powder; 600 portions and 750 portions of sand; 75-100 parts of mixed fiber; 13-22 parts of a polycarboxylic acid water reducing agent; 100-180 parts of unsaturated polyester resin and 20-33 parts of admixture; 150 portions and 320 portions of water. The invention improves various mechanical properties of the concrete, effectively improves the freeze-thaw resistance of the concrete, and reduces the preparation cost of the concrete.
Description
Technical Field
The invention relates to the technical field of building materials in civil engineering, in particular to high-performance concrete with low shrinkage.
Background
Ultra-high performance concrete, while a great improvement in mechanical properties and durability has been achieved over ordinary concrete, still has the inherent drawbacks of concrete itself. The shrinkage cracking of the concrete in the process of pouring and curing still exists in the ultra-high performance concrete, particularly the ultra-high performance concrete has the characteristics of large cement consumption, low water-cement ratio and the like, the subsequent hydration heat release is high, the self-shrinkage is large, the early shrinkage cracking is more serious than that of the common concrete, and the development and application of the ultra-high performance concrete are greatly restricted.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide high-performance concrete with low shrinkage.
The technical scheme for solving the technical problems is as follows: the high-performance concrete with low shrinkage comprises the following components in parts by weight:
150 portions and 260 portions of cement clinker powder;
100-150 parts of modified metakaolin;
30-50 parts of anhydrite powder;
300 portions and 500 portions of gravel;
150 portions and 220 portions of coal ash powder;
600 portions and 750 portions of sand;
75-100 parts of mixed fiber;
13-22 parts of a polycarboxylic acid water reducing agent;
unsaturated polyester resin 100 portions and 180 portions,
20-33 parts of an additive;
150 portions and 320 portions of water.
The invention further defines the technical scheme that:
preferably, the cement clinker powder is prepared from portland cement clinker powder and expansive high-belite sulphoaluminate cement clinker powder according to the mass ratio of 3-4: 1, grinding Portland cement clinker powder from common Portland cement clinker until the specific surface area is 385-410 m2The expansive high belite sulphoaluminate cement clinker powder is obtained by grinding the expansive high belite sulphoaluminate cement clinker until the specific surface area is 460-520m2Obtained in kg.
Preferably, the crushed stone is prepared from two small crushed stones and large crushed stone with different particle sizes according to a mass ratio of 6: 4, wherein the small crushed stone is granite with 5-20mm continuous particle size fraction, and the large crushed stone B is granite with 20-33.5mm single particle size fraction.
Preferably, the fly ash is one of class II fly ash or class I fly ash or a mixture of two of the class II fly ash and the class I fly ash.
Preferably, the sand is formed by uniformly mixing the machine-made sand and the river sand according to the weight ratio of 5:5, wherein the mud content of the river sand is less than or equal to 2.0 percent, the mud block content is less than or equal to 0.5 percent, the fineness modulus is 2.3-2.9, the parent rock strength of the machine-made sand is more than or equal to 100MPa, the continuous gradation is 2-5.15mm, the apparent density is 2550-2880kg/m3, the stone powder content is 4-7 percent, the mud content is less than 0.5 percent, the crushing value is 20-25 percent, and the MB value is less than 1.40.
Preferably, the mixed fiber comprises 15-26 parts of copper-plated straight steel fiber, 10-13 parts of PVA fiber, 13-22 parts of basalt fiber and 23-29 parts of polypropylene fiber.
Preferably, the unsaturated polyester resin is one or a mixture of more of o-benzene type unsaturated polyester resin, bisphenol A type unsaturated polyester resin or vinyl ester type unsaturated polyester resin.
Preferably, the additive is at least one of a low shrinkage agent, a retarder or an anti-cracking waterproof agent.
Preferably, the low shrinkage agent is one or a mixture of polyvinyl acetate, saturated polyester, polycaprolactone, polyurethane, block type polyvinyl acetate-styrene and modified low cross-linked polystyrene.
The invention has the beneficial effects that: according to the invention, the portland cement clinker powder and the expansive high belite sulphoaluminate cement clinker powder are mixed according to a certain proportion, and the expansive high belite sulphoaluminate cement effectively compensates the shrinkage of the portland cement, so that the expansive high belite sulphoaluminate cement has lower hydration volume shrinkage compared with the traditional portland cement, the shrinkage of the concrete is fundamentally reduced, and meanwhile, the expansive high belite sulphoaluminate cement and the anhydrite powder are used in a matching way, so that the setting and hardening process is promoted, and the strength and the long-term strength increase rate are improved;
the addition of the modified metakaolin improves the working performance of underwater concrete and the active reaction rate of the metakaolin, and is more beneficial to reducing the volume shrinkage of the concrete and improving the durability of the concrete; the fly ash has a ball effect, a micro-aggregate effect and a volcanic ash effect, wherein the ball effect of the fly ash enables the fly ash to have a ball bearing effect in a concrete mixture, the workability of concrete is improved, the micro-aggregate effect of the fly ash is that micro particles of the fly ash are filled in gaps among cement particles, the microstructure of the concrete is improved, the compactness of the concrete is increased, the two effects interact to enable the cement particles to be uniformly distributed, the water consumption is reduced, the concrete is not isolated, the working performance of the concrete is improved, the shrinkage of the concrete is reduced, the crack resistance of the concrete is improved, and meanwhile, the compressive strength of the fly ash is large enough to play a good supporting effect;
the broken stone is formed by mixing small broken stone and large broken stone which have different grain sizes and are granite according to a certain proportion, and the granite stone powder has a micro-aggregate filling effect, a micro-crystal nucleation effect and a water absorption effect, wherein the uniformity and compactness of a concrete mixture are improved by the micro-aggregate filling effect of the granite stone powder, the pore structure of hardened concrete is optimized and filled, capillary pores inside the concrete are refined, the porosity is reduced, the pore structure is improved, the micro-crystal nucleation effect of the granite stone powder can accelerate the hydration of cement, the concentrated occurrence of hydration reaction products is avoided, the porosity inside the concrete is effectively reduced, and the compressive strength and the tensile strength are improved. The water absorption effect of the granite powder can reduce the water-cement ratio of the concrete, enhance the cohesiveness and the water retention of the concrete, reduce the accumulation of free water in the concrete on a reaction interface and facilitate the improvement of the interface between cement paste and aggregate;
based on different action mechanisms of different fibers on micromechanics, the mixed fibers form an interpenetrating network structure in concrete, can be quickly and easily mixed with concrete materials, are uniformly distributed, have large specific area of polymer fibers, can form a uniform disorientation supporting system in the concrete, can disperse the shrinkage energy of the concrete to fibers with high tensile strength, effectively control the width of cracks in the concrete cracking process, improve the initial cracking stress and the tensile strength of the concrete, wherein PVA fibers and copper-plated straight steel fibers can supplement each other to improve the strength and the toughness of the concrete, when micro cracks appear in the internal structure of the concrete, substrates on two sides opposite to the cracks quit to bear load, the copper-plated straight steel fibers and the PVA fibers which cross the cracks jointly bear the load, and polypropylene fibers improve the impact resistance of the concrete, Waterproof and heat-insulating properties; the steel fiber can effectively improve the toughness, the splitting tensile strength, the bending strength and the bending strength of the concrete; basalt is a high-performance volcanic rock component, and the special silicate enables basalt fibers to have excellent chemical resistance, is an excellent material for reinforcing cement concrete, and can improve the high-temperature stability, low-temperature crack resistance, fatigue resistance and the like of the concrete; the unsaturated resin has higher elongation at break, improves the toughness of the material, greatly reduces the curing shrinkage rate of the material when being matched with a low shrinkage agent, and reduces the cracking risk of resin concrete.
Detailed Description
Example 1
The embodiment provides a high-performance concrete with low shrinkage, which comprises the following components in parts by weight: 210 parts of cement clinker powder; 100 parts of modified metakaolin; 30 parts of anhydrite powder; 400 parts of crushed stone; 150 parts of coal ash powder; 600 parts of sand; 75 parts of mixed fiber; 13 parts of a polycarboxylic acid water reducing agent; 100 parts of unsaturated polyester resin and 20 parts of additive; 200 parts of water;
wherein the cement clinker powder is prepared by mixing portland cement clinker powder and expansive high belite sulphoaluminate cement clinker powder according to the mass ratio of 3:1, wherein the portland cement clinker powder is ground by common portland cement clinker until the specific surface area is 385m2Per kg, the expansive high belite sulphoaluminate cement clinker powder is obtained by grinding the expansive high belite sulphoaluminate cement clinker until the specific surface area is 500m2The/kg is obtained;
the crushed stone comprises two types of small crushed stones and large crushed stones with different particle sizes according to the mass ratio of 6: 4, wherein the small crushed stone is granite with 15mm continuous particle size fraction, and the large crushed stone B is granite with 25mm single particle size fraction;
the fly ash is II-grade fly ash;
the sand is formed by uniformly mixing machine-made sand and river sand according to the weight ratio of 5:5, wherein the mud content of the river sand is less than or equal to 2.0 percent, the mud block content is less than or equal to 0.5 percent, the fineness modulus is 2.6, the parent rock strength of the machine-made sand is more than or equal to 100MPa, the 3mm continuous gradation is carried out, the apparent density is 2550kg/m3, the stone powder content is 4.5 percent, the mud content is less than 0.5 percent, the crushing value is 22 percent, and the MB value is less than 1.40;
the mixed fiber comprises 20 parts of copper-plated straight steel fiber, 13 parts of PVA fiber, 22 parts of basalt fiber and 23 parts of polypropylene fiber;
the unsaturated polyester resin is a mixture of bisphenol A type unsaturated polyester resin and vinyl ester type unsaturated polyester resin according to the mass ratio of 1: 1;
the additive is a low shrinkage agent which is a mixture of polyvinyl acetate and saturated polyester.
Example 2
The embodiment provides a high-performance concrete with low shrinkage, which comprises the following components in parts by weight: 150 parts of cement clinker powder; 150 parts of modified metakaolin; 40 parts of anhydrite powder; 300 parts of crushed stone; 180 parts of coal ash powder; 680 parts of sand; 90 parts of mixed fiber; 17 parts of a polycarboxylic acid water reducing agent; 180 parts of unsaturated polyester resin and 26 parts of additive; 260 parts of water;
wherein the cement clinker powder is prepared by mixing portland cement clinker powder and expansive high belite sulphoaluminate cement clinker powder according to the mass ratio of 3:1, wherein the portland cement clinker powder is ground by common portland cement clinker until the specific surface area is 400m2/kg of the expansive high belite sulphoaluminate cement clinker powder, which is obtained by grinding the expansive high belite sulphoaluminate cement clinker until the specific surface area is 470m2The/kg is obtained;
the crushed stone comprises two types of small crushed stones and large crushed stones with different particle sizes according to the mass ratio of 6: 4, wherein the small crushed stone is granite with 5mm continuous particle size fraction, and the large crushed stone B is granite with 20mm single particle size fraction;
the fly ash is formed by mixing II-grade fly ash and I-grade fly ash according to the mass ratio of 1: 1;
the sand is formed by uniformly mixing machine-made sand and river sand according to the weight ratio of 5:5, wherein the mud content of the river sand is less than or equal to 1.8 percent, the mud block content is less than or equal to 0.45 percent, the fineness modulus is 2.3, the parent rock strength of the machine-made sand is more than or equal to 100MPa, the 3.5mm continuous gradation is carried out, the apparent density is 2650-kg/m3, the stone powder content is 4.6 percent, the mud content is less than 0.45 percent, the crushing value is 23 percent, and the MB value is less than 1.40;
the mixed fiber comprises 15 parts of copper-plated straight steel fiber, 13 parts of PVA fiber, 13 parts of basalt fiber and 29 parts of polypropylene fiber;
the unsaturated polyester resin is a mixture of bisphenol A type unsaturated polyester resin and vinyl ester type unsaturated polyester resin according to the mass ratio of 1: 1;
the admixture is a low-shrinkage agent and a retarder, wherein the low-shrinkage agent is a mixture of polyvinyl acetate and saturated polyester.
Example 3
The embodiment provides a high-performance concrete with low shrinkage, which comprises the following components in parts by weight: 260 parts of cement clinker powder; 150 parts of modified metakaolin; 50 parts of anhydrite powder; 500 parts of macadam; 220 parts of coal ash powder; 750 parts of sand; 100 parts of mixed fiber; 22 parts of a polycarboxylic acid water reducing agent; 180 parts of unsaturated polyester resin and 33 parts of additive; 320 parts of water;
wherein the cement clinker powder is prepared from portland cement clinker powder and expansive high belite sulphoaluminate cement clinker powder according to the mass ratio of 4: 1 mixing, wherein the portland cement clinker powder is ground by ordinary portland cement clinker until the specific surface area is 410m2Per kg, the expansive high belite sulphoaluminate cement clinker powder is obtained by grinding the expansive high belite sulphoaluminate cement clinker until the specific surface area is 520m2The/kg is obtained;
the crushed stone comprises two types of small crushed stones and large crushed stones with different particle sizes according to the mass ratio of 6: 4, wherein the small crushed stone is granite with 20mm continuous particle size fraction, and the large crushed stone B is granite with 33.5mm single particle size fraction;
the fly ash is formed by mixing II-grade fly ash and I-grade fly ash according to the mass ratio of 1: 1;
the sand is formed by uniformly mixing machine-made sand and river sand according to the weight ratio of 5:5, wherein the mud content of the river sand is less than or equal to 1.7 percent, the mud block content is less than or equal to 0.41 percent, the fineness modulus is 2.6, the parent rock strength of the machine-made sand is more than or equal to 100MPa, the 5mm continuous gradation is carried out, the apparent density is 2880kg/m3, the stone powder content is 7 percent, the mud content is less than 0.5 percent, the crushing value is 25 percent, and the MB value is less than 1.40;
the mixed fiber comprises 26 parts of copper-plated straight steel fiber, 13 parts of PVA fiber, 22 parts of basalt fiber and 23 parts of polypropylene fiber.
The unsaturated polyester resin is a mixture of o-benzene type unsaturated polyester resin, bisphenol A type unsaturated polyester resin and vinyl ester type unsaturated polyester resin according to the mass ratio of 2:5: 3.
The additive is low shrinkage agent, retarder and anti-cracking waterproof agent, wherein the low shrinkage agent is a mixture of polyvinyl acetate and saturated polyester.
The mechanical property test and the shrinkage strain test were performed on the samples 1 to 3,
(1) shrinkage strain: cylindrical test blocks with the diameter of 100mm and the height of 300mm are respectively manufactured according to the components in the examples 1-3, the test is carried out in a constant temperature and humidity environment, the temperature is 20 +/-5 ℃, the relative humidity is 60 +/-5%, after the concrete is hardened, the surface is sealed by paraffin wax, the test blocks are placed on a test bracket, the initial length L0 after the concrete is kept still for 4 hours by using a micrometer test is utilized, then the length Lt of the concrete at 7d, 14d and 28d is respectively tested, and the shrinkage strain is calculated according to a formula: n ═ L0-Lt)/L0 × 106, and the data obtained are shown in table 1;
(2) compressive strength: standard cube test blocks with the side length of 100mm are respectively manufactured according to the components in the examples 1-3, the test blocks are cured for 28d under standard conditions, the compressive strength and the flexural strength are tested according to the standard GB17671-1999 cement mortar strength test method, and the obtained data are shown in the table 2.
TABLE 1
TABLE 2
| Compressive strength (MPa) | Flexural strength (MPa) | |
| Example 1 | 145.6 | 34.5 |
| Example 2 | 147.9 | 34.8 |
| Example 3 | 148.3 | 35.1 |
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (9)
1. A high performance concrete having low shrinkage characterized in that: comprises the following components in parts by weight:
150 portions and 260 portions of cement clinker powder;
100-150 parts of modified metakaolin;
30-50 parts of anhydrite powder;
300 portions and 500 portions of gravel;
150 portions and 220 portions of coal ash powder;
600 portions and 750 portions of sand;
75-100 parts of mixed fiber;
13-22 parts of a polycarboxylic acid water reducing agent;
unsaturated polyester resin 100 portions and 180 portions,
20-33 parts of an additive;
150 portions and 320 portions of water.
2. The high-performance concrete with low shrinkage according to claim 1, wherein the cement clinker powder is prepared from portland cement clinker powder and expansive high belite sulphoaluminate cement clinker powder in a mass ratio of 3-4: 1, grinding Portland cement clinker powder from common Portland cement clinker until the specific surface area is 385-410 m2Per kg of highly swellable belite sulphoaluminateThe cement clinker powder is the expansive high belite sulphoaluminate cement clinker ground into 460-520m specific surface area2Obtained in kg.
3. The high-performance concrete with low shrinkage according to claim 1, wherein the crushed stone is prepared from two types of small crushed stone and large crushed stone with different particle sizes according to a mass ratio of 6: 4, wherein the small crushed stone is granite with 5-20mm continuous particle size fraction, and the large crushed stone B is granite with 20-33.5mm single particle size fraction.
4. The high performance concrete with low shrinkage of claim 1, wherein the fly ash is one of class II fly ash or class I fly ash or a mixture of both.
5. The concrete with low shrinkage and high performance as claimed in claim 1, wherein the sand is prepared by uniformly mixing machine-made sand and river sand at a weight ratio of 5:5, wherein the mud content of the river sand is less than or equal to 2.0%, the mud content is less than or equal to 0.5%, the fineness modulus is 2.3-2.9, the parent rock strength of the machine-made sand is greater than or equal to 100MPa, the continuous gradation is 2-5.15mm, the apparent density is 2550-2880kg/m3, the stone powder content is 4-7%, the mud content is less than 0.5%, the crushing value is 20-25%, and the MB value is less than 1.40.
6. The high-performance concrete with low shrinkage of claim 1, wherein the mixed fiber comprises 15-26 parts of copper-plated flat steel fiber, 10-13 parts of PVA fiber, 13-22 parts of basalt fiber and 23-29 parts of polypropylene fiber.
7. The concrete with low shrinkage and high performance as claimed in claim 1, wherein the unsaturated polyester resin is one or more of ortho-benzene type unsaturated polyester resin, bisphenol A type unsaturated polyester resin or vinyl ester type unsaturated polyester resin.
8. The high-performance concrete with low shrinkage according to claim 1, wherein the admixture is at least one of a low shrinkage agent, a retarder or an anti-cracking waterproof agent.
9. The concrete with low shrinkage and high performance as claimed in claim 8, wherein the low shrinkage agent is one or more of polyvinyl acetate, saturated polyester, polycaprolactone, polyurethane, block-type polyvinyl acetate-styrene and modified low-crosslinked polystyrene.
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| CN202111163154.9A CN113979712A (en) | 2021-09-30 | 2021-09-30 | High-performance concrete with low shrinkage |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114477930A (en) * | 2022-03-01 | 2022-05-13 | 华创建筑设计有限公司 | C90 early strength resin concrete and preparation process thereof |
| CN114751705A (en) * | 2022-05-19 | 2022-07-15 | 杭州修路人科技股份有限公司 | High-performance self-compacting concrete and preparation method thereof |
| CN114956687A (en) * | 2022-05-30 | 2022-08-30 | 三亚瑞泽双林混凝土有限公司 | Preparation method of low-shrinkage high-strength concrete |
-
2021
- 2021-09-30 CN CN202111163154.9A patent/CN113979712A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114477930A (en) * | 2022-03-01 | 2022-05-13 | 华创建筑设计有限公司 | C90 early strength resin concrete and preparation process thereof |
| CN114751705A (en) * | 2022-05-19 | 2022-07-15 | 杭州修路人科技股份有限公司 | High-performance self-compacting concrete and preparation method thereof |
| CN114751705B (en) * | 2022-05-19 | 2023-03-17 | 杭州修路人科技股份有限公司 | High-performance self-compacting concrete and preparation method thereof |
| CN114956687A (en) * | 2022-05-30 | 2022-08-30 | 三亚瑞泽双林混凝土有限公司 | Preparation method of low-shrinkage high-strength concrete |
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