CN111377629B - Special efficient expanding agent for concrete filled steel tube and preparation method and application thereof - Google Patents
Special efficient expanding agent for concrete filled steel tube and preparation method and application thereof Download PDFInfo
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- CN111377629B CN111377629B CN201811651772.6A CN201811651772A CN111377629B CN 111377629 B CN111377629 B CN 111377629B CN 201811651772 A CN201811651772 A CN 201811651772A CN 111377629 B CN111377629 B CN 111377629B
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
- C04B40/0042—Powdery mixtures
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/30—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts being composed of two or more materials; Composite steel and concrete constructions
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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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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a special efficient expanding agent for concrete filled steel tube and a preparation method and application thereof. The efficient expanding agent special for the concrete-filled steel tube provided by the invention provides calcium and magnesium sources by dolomite, and utilizes Fe in solid wastes of steel slag and pyrite cinder2O3、SiO2、Al2O3And SO3And calcining at low temperature to obtain the product. The high-efficiency expansion clinker has the advantages of 4 expansion sources of calcium hydroxide, ettringite, ferric hydroxide and magnesium hydroxide, and has the functions of course regulation and whole process compensation of concrete filled steel tube shrinkage; and the hydraulic cementing component is contained to improve the strength of the concrete. The steel slag, pyrite cinder and other waste residues are adopted to replace non-renewable resources such as alumina, anhydrite and the like to prepare the special expansion material for the steel tube concrete, and the special expansion material has important significance for saving resources and protecting ecological environment.
Description
Technical Field
The invention belongs to the technical field of building material concrete admixtures, and particularly relates to a special efficient anti-cracking agent for steel pipe concrete, and a preparation method and application thereof.
Background
Concrete and steel are the two most important building materials that constitute modern building structures. Concrete Filled Steel tubes (Concrete Filled Steel Tube) are a Steel-Concrete composite structure formed by filling Concrete in Steel tubes. The concrete in the steel pipe is laterally constrained by the steel pipe to be in a three-dimensional stress state, so that brittle failure is inhibited, and the compressive strength is improved; meanwhile, the defect that a steel structure is easy to partially bend is overcome, so that the steel pipe concrete structure has great advantages in overall mechanical performance.
Due to these unique advantages, the application of steel tube concrete in various structural engineering, such as building structures, bridge structures, offshore structures, protective structures, power transmission and transformation towers, and the like, is determined. China obtains remarkable achievements in the research and application of the steel pipe concrete, such as the establishment of angjiang bridges and Yunzui railway nanchuanjiang bridges with the span of more than 400 m. After the steel pipe concrete is poured, the concrete filled inside is directly bonded with the wall of the external steel pipe. However, due to the shrinkage deformation (mainly self-shrinkage and temperature shrinkage) and creep of the concrete, the concrete and the steel pipe wall are easy to be seriously stripped and sticky with the lapse of time.
The synergistic and complementary action between the steel tube and the core concrete is the root of a series of outstanding advantages of the steel tube concrete. Whether the steel pipe concrete is hollow after being poured directly influences the bearing capacity of the structure and the composite elastic modulus of the steel pipe concrete, so that the safety of the structure is influenced and whether the steel pipe concrete can normally work is influenced. How to compensate or inhibit the shrinkage deformation and creep of the core concrete and prevent the loss (void and debonding) of the concrete-steel pipe interface becomes a hot point of attention in the engineering industry.
The expansion component is utilized to compensate the shrinkage of concrete through volume expansion generated in the hydration process, and the method is one of important measures for preventing the steel pipe and the core concrete from being hollow and improving the structural stability of the steel pipe concrete. At present, low-alkali high-efficiency UEA expanding agents and HCSA high-performance expanding agents are commonly used as high-performance concrete expanding agents of structures such as steel pipe concrete arch bridges, but the expansion efficiency of calcium oxide and calcium sulphoaluminate expanding agents is basically and completely exerted within 3 days of hydration age, and the later-stage self-contraction, temperature-drop contraction and contraction caused by creep of core concrete cannot be compensated. How to prepare the special expanding agent for the concrete filled steel tube for compensating the core concrete shrinkage in the whole process is a problem to be solved urgently in the field of building materials.
Chinese patent publication No. CN 1772692a discloses a high-energy delayed expansive agent for closed concrete and a preparation method thereof. The expanding agent is prepared from sulphoaluminate cement clinker, steel slag, CaO, MgO and flintThe paste, the porous mineral powder and the porous material are mixed. The expanding agent can obtain delayed expansion with certain expansion amount to compensate the later shrinkage of concrete. But the mixing amount of the expanding agent reaches 10-18%, which is far beyond the recommended mixing amount of 6-10% in the technical specification of the application of the shrinkage-compensating concrete. And the expanding agent contains 10-20% of porous mineral powder and porous materials. The porous mineral powder and the porous material absorb a large amount of water, and although reaction water can be provided for hydration of the expanding agent, the workability of concrete is seriously influenced, the core concrete and the steel pipe shell in the casting period are not compact, and the concrete is easy to be separated in the casting period. The particle size range of the porous material is 5-9 mm, and the specific surface area of the steel slag is 400-500 m2/kg, the specific surface area of the other components is more than or equal to 280m2The grain size and the density of the materials are greatly different, and the compounded expanding agent is easy to delaminate in the storage process.
Chinese patent publication No. CN 107827389a discloses a method for preparing a sustained stable intumescent expanding agent. The expanding agent is prepared from metakaolin with high activity, steel slag, anhydrite, modified sulphoaluminate cement, sodium silicate solution, silane coupling agent, acetone, magnesium hydroxide and calcium oxide. The self-made metakaolin, steel slag and anhydrite powder of the expanding agent need to be fermented in biogas slurry for 5-7 days, and free CaO and MgO in the steel slag react to generate Ca (OH) in the fermentation process2And Mg (OH)2The expansion efficiency of the expanding agent is reduced; the solubility of magnesium hydroxide is extremely low, and the expansion performance of the magnesium hydroxide cannot be enhanced by adding the magnesium hydroxide; and the preparation process is complex and consumes a large amount of energy.
Chinese patent publication No. CN 1603272a discloses a cement and concrete expanding agent prepared from various industrial waste residues. The expanding agent mainly comprises fluorgypsum, high-calcium fly ash and steel slag powder. The steel slag treated by the expanding agent by using a tray water quenching process contains a large amount of free dead burned CaO and MgO, and if the expanding agent is directly used for a wall thin-wall structure, the stability problem is easily caused; and fluorogypsum affects cement set time. The expansion agent has low expansion efficiency and cannot compensate the early self-shrinkage and temperature-drop shrinkage of concrete.
Chinese patent publication No. CN 107200500A discloses a self-compacting non-shrinking concrete-filled steel tube special additive. The additive consists of light-burned calcium oxide clinker, light-burned magnesium oxide clinker, gypsum, fly ash, polycarboxylic acid water reducing agent, thixotropic agent and the like. The special additive can compensate early shrinkage of core concrete in the age of 60d after the core concrete is poured, but cannot effectively compensate late shrinkage and creep shrinkage of the core concrete.
The expanding agent is prepared by taking sulphoaluminate cement, high-calcium ash, light-burned calcareous clinker, light-burned magnesia clinker, steel slag and the like as raw materials, and the problems of low early expansion capacity or insufficient later expansion capacity are generally existed; high energy consumption for preparation, complex process and the like. Therefore, it is required to solve the above problems and to prepare a special expansive agent capable of compensating the shrinkage of the core concrete in the whole process while using a large amount of solid wastes.
With the rapid development of modern steel and chemical industries, the steel yield is continuously increased, the output of industrial solid wastes such as steel slag and the like is also rapidly increased, the reasonable utilization and the effective recovery of the steel slag are one of important signs of the technical progress of the modern steel and iron industry, are important measures for solving the shortage of steel scrap and reducing the production cost of steel enterprises, and are good strategies for protecting the environment, reducing the pollution, turning harm into good, changing waste into valuable and benefiting the nation and people. At present, the utilization rate of steel slag in China is low, and the stacking of a large amount of steel slag not only occupies a large area of land, but also causes pollution to soil, atmosphere and water.
The pyrite cinder is a byproduct in the pyrite preparation process, and the main component of the pyrite cinder is Fe2O3、Al2O3、SiO2And SO3And the like. In recent years, about 1400 million tons of sulfuric acid is prepared by pyrite in China every year, and 0.7-1.0 ton of cinder is produced when 1 ton of sulfuric acid is produced; over 1000 million tons of cinder are discharged every year in China, and account for about 30 percent of chemical waste. If the treatment is not carried out in time or is not carried out properly, a large amount of pyrite cinder causes serious pollution to the local ecological environment and harms the human health. How to consume solid waste, promote resource recycling, change waste into valuable, and practice the green water green mountainThe method has important practical significance for realizing the development of low-carbon economy by the concept of the Jinshan Yinshan.
The solid wastes (steel slag and pyrite cinder) contain more CaO and Fe2O3、SiO2、Al2O3、SO3And MgO and the like, and the special efficient expanding agent for the concrete filled steel tube is prepared, and has important significance for saving resources and protecting the ecological environment.
Disclosure of Invention
Based on the consideration of utilizing solid wastes (steel slag and pyrite cinder), the invention provides a special efficient anti-cracking agent for steel pipe concrete and a preparation method and application thereof, aiming at the problems that an expanding agent prepared by utilizing alternative raw materials in the prior art is generally low in early expansion energy, insufficient in later expansion capacity, high in preparation energy consumption, complex in process and the like.
The special efficient expanding agent for the concrete filled steel tube can compensate the shrinkage of core concrete in the whole process. The special efficient expanding agent for the steel tube concrete provides calcium and magnesium sources by dolomite, and utilizes Fe in solid wastes of steel slag and pyrite cinder2O3、SiO2、Al2O3And SO3And the like, and the raw materials are calcined at low temperature on the premise of ensuring the complete reaction of the raw materials.
The efficient expanding agent for the steel pipe concrete comprises the following raw materials of dolomite, pyrite cinder and steel slag in a mass ratio: 60:30: 10-80: 15: 5.
The chemical components of the pyrite cinder are as follows: fe2O3：30～70wt％，Al2O3：15～45wt％，SiO2：10～55wt％，SO3：1～5wt％；
The MgO/(FeO + MnO) of the steel slag is more than or equal to 1;
said dolomite CaMg (CO)3)2The content is more than 90 wt%.
Due to the requirement on the grinding fineness; the specific surface area of the raw material is 150-400 m2(iv) kg; the specific surface area of the special efficient expanding agent for the concrete filled steel tube is 200-450 m2/kg。
Said steelThe special efficient expanding agent for the concrete-filled tube comprises the following components in percentage by mass: light burning of CaO: 30-50 wt%, light-burned MgO: 20-50 wt%, f-CaO: 5-10 wt%, dead-burned-MgO: 5-10 wt%, the remainder being Fe2O3、C3S、C2S、C4AF、C4A3S。
The invention relates to a preparation method of a special efficient expanding agent for concrete filled steel tube, which comprises the following steps:
(1) grinding the mixed powder of dolomite, steel slag and pyrite cinder into powder with the specific surface area of 150-400 m2Raw material/kg;
(2) calcining the raw material prepared in the step (1) at 1100-1350 ℃ for 30-120 min, and quenching in air after calcining to obtain the high-efficiency expansion clinker for cement concrete;
(3) grinding the high-efficiency expanded clinker for the cement concrete prepared in the step (2) to a specific surface area of 200-450 m2Powder material of/kg;
the present invention is not particularly limited to the apparatus for producing the expanded clinker by calcination and the state of the raw material. The expansion clinker can be prepared by calcining in a vertical kiln, a tunnel kiln, a roller kiln or a rotary kiln. According to the scheme, the expansion clinker is prepared by adopting a rotary kiln.
And (3) calcining the raw material at 1100-1350 ℃ for 30-120 min in the step (2).
As an improvement, the calcining temperature is 1200-1300 ℃, and the calcining time is 60 min.
The invention relates to a special high-efficiency expanding agent for concrete filled steel tube, which comprises the following components in part by weight: light burning CaO, C4A3S forms Ca (OH) in early 3-7d hydration reaction of concrete2And ettringite; fe2O3Early formation of Fe (OH) in concrete under alkaline solution conditions3(ii) a The light-burned MgO continuously reacts in the middle stage of a concrete hydration system to form Mg (OH)2(ii) a Free CaO and dead burned MgO have low hydration activity, and are continuously hydrated to generate Ca (OH) in the later stage of the concrete filled steel tube2And Mg (OH)2. The high-efficiency expansion clinker of the invention has the advantages of 4 expansion sources of calcium hydroxide, ettringite, ferric hydroxide and magnesium hydroxideThe method has the functions of regulating and controlling the process and compensating the shrinkage of the concrete filled steel tube in the whole process.
The high-efficiency expanding agent special for the concrete filled steel tube is mixed into the concrete, and C in the expanding clinker3S、C2S and C4AF has gelling properties, where C3S and C4AF has some early intensity; C2S has the effect of stabilizing the later strength of the concrete material. The high-efficiency expansion clinker has the effect of improving the strength of concrete.
The special efficient expanding agent for the concrete-filled steel tube is suitable for the concrete-filled steel tube with the strength grade of C50-C100, and the mixing amount of the efficient expanding agent accounts for 3-10% of the total mass of the rubber material.
Compared with the prior art, the invention has the beneficial effects that:
(1) the steel slag, the pyrite cinder and other waste residues are adopted to replace non-renewable resources such as alumina, anhydrite and the like to prepare the special expansion material for the steel tube concrete, an effective way is provided for the effective treatment of solid wastes (the steel slag and the pyrite cinder), and the special expansion material has important significance for saving resources and protecting the ecological environment.
(2) Dolomite, steel slag and pyrite cinder are used as main raw materials, and the expansion source with 4 expansion sources of calcium hydroxide, ettringite, iron hydroxide and magnesium hydroxide is prepared through a general process, and has the effects of course regulation and control and whole-process compensation of concrete-filled steel tubes shrinkage. Compared with the expanding agent with a single expansion source, the expanding efficiency is greatly improved, and the production cost for preparing the expanded clinker is reduced.
(3) Because the expansion clinker contains C3S、C2S and C4Compared with the existing commercially available concrete expanding agent, the hydraulic cementing materials such as AF obviously improve the compressive strength and the breaking strength of the cement-based material.
(4) The preparation method of the special efficient expanding agent for the concrete filled steel tube has the characteristics of convenient raw material adoption and easy acquisition; the preparation process is simple and easy to implement and is convenient to popularize and apply.
Detailed Description
The technical features of the high-efficiency expansive clinker for cement concrete and the preparation method thereof are further explained below by combining specific examples, but not limited to the examples; in the present invention, all the percentages are mass percentages unless otherwise specified.
The first embodiment is as follows:
high-efficiency expanding agent special for concrete filled steel tube and preparation of expanding agent
Mixing the components in a mass ratio of 60:30:10, crushing and mixing the dolomite, the pyrite cinder and the steel slag ash, and grinding the mixture by a grinder until the fineness is 150m2Per kg of raw meal. Calcining the ground raw material powder at 1200 ℃, calcining for 120min at the temperature, immediately taking out a sintered sample after the calcination is finished, quenching in air, and grinding to obtain the product with the specific surface area of 400m2An expansive clinker powder for cement concrete.
Table 3 shows the chemical composition (in wt.%) of the raw materials dolomite, pyrite cinder and steel slag
| Name (R) | CaO | Fe2O3 | Al2O3 | SiO2 | SO3 | MgO | Loss |
| Dolomite | 28.4 | 1.1 | 0.35 | 1.3 | 0.2 | 21.9 | 45.7 |
| Pyrite cinder | 6.07 | 47.80 | 27.86 | 16.11 | 2.99 | 0.33 | 2.23 |
| Steel slag | 39.42 | 21.35 | 5.97 | 20.35 | 0.81 | 6.05 | 1.87 |
Mixing the expanding agent with the dispersive carrier fly ash and mineral powder to form a mixture with the specific surface area of 300m2Per kg of concrete expanding agent.
Table 4 shows that the prepared high-efficiency expanding agent and the prepared common expanding agent compounded by the dispersive carriers in different proportions
(II) Performance testing of efficient expansive agent for cement concrete
The performance of the high-efficiency expanding agent for the cement concrete prepared by the invention is detected by using reference cement specified in GB8076-2008 according to an experimental method of GB/T23439-2017 concrete expanding agent, and is compared with the performance of commercially available CSA expanding agents and CEA expanding agents.
Table 5 shows the deformation and mechanical properties of the mortar containing the conventional expanding agent, CSA expanding agent and CEA expanding agent
The detection result in Table 5 shows that the expansion performance of the prepared expanding agent reaches the requirement of the type II product of GB/T23439-. Compared with the CSA expanding agent and the CEA expanding agent which are sold in the market, the expanding agent prepared by the expanding agent obviously improves the compression strength of the mortar.
Claims (6)
1. The special efficient expanding agent for the concrete filled steel tube is characterized in that a calcium source and a magnesium source are provided by dolomite, and Fe in solid wastes of steel slag and pyrite cinder is utilized2O3、SiO2、Al2O3And SO3Calcining at low temperature to obtain the product;
the chemical components of the pyrite cinder are as follows: fe2O3：30~70wt%，Al2O3：15~45wt%，SiO2：10~55wt%，SO3：1~5wt%；
MgO/(FeO + MnO) of the steel slag is more than or equal to 1;
CaMg (CO) of said dolomite3)2The content is more than 90 wt%;
the mass ratio of dolomite, pyrite cinder and steel slag in the raw materials is as follows: 60:30: 10-80: 15: 5.
2. The efficient expanding agent special for the concrete-filled steel tube according to claim 1, wherein the specific surface area of the raw material is 150-400 m2(iv) kg; the specific surface area of the special efficient expanding agent for the concrete filled steel tube is 200-450 m2/kg。
3. The special efficient expanding agent for the concrete-filled steel tube according to claim 1, which comprises the following components in percentage by mass: light burning of CaO: 30-50 wt%, light-burned MgO: 20-50 wt%, f-CaO: 5-10 wt%, dead-burned-MgO: 5-10 wt%, the remainder being Fe2O3、C3S、C2S、C4AF、C4A3S。
4. The preparation method of the special efficient expanding agent for the concrete filled steel tube of any one of claims 1 to 3 is characterized by comprising the following steps of:
(1) grinding the mixed powder of dolomite, steel slag and pyrite cinder into powder with the specific surface area of 150-400 m2Per kg of raw meal;
(2) calcining the raw material prepared in the step (1) at 1100-1350 ℃ for 30-120 min, and quenching in air after calcining to obtain the high-efficiency expansion clinker for cement concrete;
(3) grinding the high-efficiency expanded clinker for the cement concrete prepared in the step (2) to a specific surface area of 200-450 m2Powder/kg.
5. The method according to claim 4, wherein the calcination temperature is 1200-1300 ℃ and the calcination time is 60 min.
6. The application of the special efficient concrete-filled steel tube expanding agent for any one of claims 1 to 3, wherein the special efficient concrete-filled steel tube expanding agent is suitable for the concrete-filled steel tubes with the strength grade of C50-C100, and the dosage of the special efficient concrete-filled steel tube expanding agent accounts for 3-10% of the total mass of the total glue material.
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| CN111847954A (en) * | 2020-07-09 | 2020-10-30 | 内蒙古宏尔高新材料科技有限公司 | Expansive agent for cement-based self-leveling mortar and preparation method and application thereof |
| CN114477829B (en) * | 2022-01-17 | 2022-09-09 | 西安建祥建材科技有限公司 | Multi-component composite reinforced anti-cracking agent for concrete and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104909596A (en) * | 2015-04-03 | 2015-09-16 | 中国建筑股份有限公司 | High efficiency composite expanding agent for high-strength self-stressing concrete filled steel tube and preparation method thereof |
| CN105712642A (en) * | 2016-01-14 | 2016-06-29 | 江苏苏博特新材料股份有限公司 | Efficient expansion clinker for cement concrete, preparation method of efficient expansion clinker and application of efficient expansion clinker |
| CN107827389A (en) * | 2017-11-07 | 2018-03-23 | 常州福隆工控设备有限公司 | A kind of preparation method of continual and steady intumescent swelling agent |
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| US20050034635A1 (en) * | 2003-08-13 | 2005-02-17 | Pin-Chuan Lin | Process and composition for the manufacture of cement expansion additive |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104909596A (en) * | 2015-04-03 | 2015-09-16 | 中国建筑股份有限公司 | High efficiency composite expanding agent for high-strength self-stressing concrete filled steel tube and preparation method thereof |
| CN105712642A (en) * | 2016-01-14 | 2016-06-29 | 江苏苏博特新材料股份有限公司 | Efficient expansion clinker for cement concrete, preparation method of efficient expansion clinker and application of efficient expansion clinker |
| CN107827389A (en) * | 2017-11-07 | 2018-03-23 | 常州福隆工控设备有限公司 | A kind of preparation method of continual and steady intumescent swelling agent |
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