CN116283076A - PHC pipe pile based on low-carbon gel material and preparation method thereof - Google Patents
PHC pipe pile based on low-carbon gel material and preparation method thereof Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 35
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title abstract description 8
- 239000004567 concrete Substances 0.000 claims abstract description 56
- 239000002893 slag Substances 0.000 claims abstract description 52
- 238000000034 method Methods 0.000 claims abstract description 44
- 239000004576 sand Substances 0.000 claims abstract description 43
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 30
- 239000010959 steel Substances 0.000 claims abstract description 30
- 239000004575 stone Substances 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 51
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 27
- 230000002787 reinforcement Effects 0.000 claims description 17
- 238000000227 grinding Methods 0.000 claims description 12
- 235000019353 potassium silicate Nutrition 0.000 claims description 11
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 5
- 159000000009 barium salts Chemical class 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 235000012239 silicon dioxide Nutrition 0.000 claims description 5
- 239000000176 sodium gluconate Substances 0.000 claims description 5
- 235000012207 sodium gluconate Nutrition 0.000 claims description 5
- 229940005574 sodium gluconate Drugs 0.000 claims description 5
- 239000008235 industrial water Substances 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 8
- 239000011398 Portland cement Substances 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 230000008569 process Effects 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 abstract description 2
- 239000002440 industrial waste Substances 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 17
- 239000003513 alkali Substances 0.000 description 8
- 239000011372 high-strength concrete Substances 0.000 description 5
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000010025 steaming Methods 0.000 description 3
- 210000002435 tendon Anatomy 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 125000001309 chloro group Chemical class Cl* 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
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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
- C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
-
- 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
- C04B40/02—Selection of the hardening environment
- C04B40/024—Steam hardening, e.g. in an autoclave
-
- 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]
Abstract
The invention relates to a PHC pipe pile based on a low-carbon gel material and a preparation method thereof. The concrete consists of slag, steel slag, ground sand, an exciting agent, stones, mixed sand and water, and the setting and hardening process of the concrete is regulated and controlled by utilizing a special alkaline retarder, so that the problem of quick setting of the concrete is solved. The PHC pipe pile produced by using the concrete to prepare the C80 concrete not only can improve the mechanical property and the corrosion resistance of the PHC pipe pile, but also can reduce the consumption of Ordinary Portland Cement (OPC), consume a large amount of industrial waste residues, improve the utilization rate of steel slag, reduce the occupation area of stacking waste residues and reduce the carbon emission, has good economic, social and environmental benefits, and is suitable for large-scale popularization and application.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a PHC pipe pile based on a low-carbon gel material and a preparation method thereof.
Background
The prestressed high-strength concrete pipe pile (PHC pipe pile for short) is a hollow cylinder type concrete prefabricated component made up by adopting pretensioning method prestressing, centrifugal forming, steam curing and pressure steam curing process, mainly formed from reinforced concrete pile body and two end plates, and its strength grade must not be lower than C80. Compared with other tubular piles, the PHC tubular pile has the advantages of short construction period, high single pile bearing capacity, reliable pile sinking quality, wide application range, high cost performance and the like, and has wide application in the construction field. Since PHC pipe piles are developed in China in the 80 s of the last century, the engineering application of PHC pipe piles is expanding continuously along with the continuous development of economy in China. To date, china has become the country with the largest number of PHC pipe piles in global production and application.
However, PHC pile concrete is used as high-strength concrete, and has a special autoclaved technology, so that the energy consumption and the environmental pollution are high. According to incomplete statistics, only in the PHC pipe pile production process, each concrete CO 2 The discharge amount is up to 104.5kg, and the SO is the concrete of each side 2 The discharge amount was about 0.54kg. OPC is used as one of main raw materials of PHC tubular pile concrete, and releases a large amount of CO in the production process 2 Is the third largest source of global carbon emissions. Therefore, finding a method for reducing the consumption of the ordinary Portland cement in the PHC pipe pile and even completely replacing the ordinary Portland cement is significant, which is not only beneficial to energy conservation and environmental protection, but also has considerable economic value. Therefore, the C80 concrete PHC pipe pile prepared by adopting the green and environment-friendly concrete has wide application prospect and market.
Disclosure of Invention
The invention aims to provide a PHC pipe pile based on a low-carbon gel material and a preparation method thereof, aiming at the defects of the prior art. The formula of PHC tubular pile concrete is improved, and an alkali-slag-steel slag-ground fine sand cementing material is used for replacing Ordinary Portland Cement (OPC), and the setting and hardening speed of the PHC tubular pile concrete is regulated and controlled by a special alkaline retarder. The OPC dosage can be reduced, and the energy-saving and environment-friendly effects are achieved, so that the economic benefit is good; and the C80 concrete PHC pipe pile prepared based on the concrete has the characteristics of environmental protection, short production period, high strength and good durability, and has obvious advantages compared with the traditional PHC pipe pile in performance.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the PHC pipe pile based on the low-carbon cementing material consists of concrete and reinforcing steel bars, wherein the strength grade of the concrete is C80, and the raw materials are not mixed with ordinary Portland cement with high energy consumption and high carbon emission.
The concrete consists of slag, steel slag, ground sand, an exciting agent, stones, mixed sand, water and a special alkaline retarder. Wherein the dosage of each component is as follows: 180-280 kg/m of slag 3 The method comprises the steps of carrying out a first treatment on the surface of the 30-130 kg/m of steel slag 3 The method comprises the steps of carrying out a first treatment on the surface of the 30-130 kg/m of grinding sand 3 The method comprises the steps of carrying out a first treatment on the surface of the 70-130 kg/m of exciting agent 3 The method comprises the steps of carrying out a first treatment on the surface of the 1200-1300 kg/m of stone 3 The method comprises the steps of carrying out a first treatment on the surface of the 650-750 kg/m of mixed sand 3 The method comprises the steps of carrying out a first treatment on the surface of the 70-120 kg/m of water 3 The method comprises the steps of carrying out a first treatment on the surface of the Special alkaline retarder 2-10 kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The dry apparent density of the alkali slag-steel slag-ground sand concrete is 2300-2800 kg/m 3 。
The special alkaline retarder is compounded by barium salt and sodium gluconate, and is suitable for the low-carbon gelling material system.
The fine sand is formed by grinding natural river sand by a machine, the silicon dioxide content is more than 80 percent, and the specific surface area is not less than 400m 2 /kg; the slag adopts S95 slag with specific surface area of 400-600 m 2 /kg; the specific surface area of the steel slag is not less than 400m 2 /kg。
The exciting agent adopts industrial-grade water glass with the modulus of 3.0-3.3, and NaOH (sodium hydroxide) is used for adjusting the modulus to 1.0-2.0 for standby.
A method of making a PHC pile based on a low carbon gelling material, comprising the steps of:
1) Mixing slag, steel slag, fine sand, stones and mixed sand uniformly in proportion, dissolving a special alkaline retarder in water, adding the special alkaline retarder and an exciting agent, mixing and stirring to form a concrete mixture, wherein the total stirring time is not less than 3min;
2) Connecting the reinforcement cage with a prestress tensioning and fixing device, placing the reinforcement cage into a prestress tubular pile die, pouring concrete, closing the die, tensioning prestress and centrifuging;
3) After centrifugal molding, the mold is sent into a steam curing pool (the steam curing temperature in the pool is controlled to be 80+/-10 ℃) for 7+/-1 hours, and then the mold is released;
4) And (3) delivering the demolded PHC pipe pile into an autoclave for 8-15 hours for autoclaved curing (the concrete curing mode is as follows: raising the temperature and the pressure for 1-3.5 hours, keeping the temperature and the pressure for 5-8 hours, reducing the temperature and the pressure for 1-3.5 hours, wherein the steam pressure in the autoclave is 1.0+/-0.1 MPa at the constant temperature and the pressure, and the temperature is 180-200 ℃. And after curing, obtaining a finished product.
Compared with the prior art, the invention has the following beneficial effects:
(1) In the PHC pipe pile based on the low-carbon cementing material, the alkali-activated cementing material is used for replacing Ordinary Portland Cement (OPC) in PHC pipe pile concrete, so that not only can the environmental pollution caused by OPC production be reduced, but also the industrial waste residue can be effectively utilized, the utilization rate of the steel slag is improved, and the green development of the pipe pile industry is promoted. Therefore, compared with the traditional PHC pipe pile, the PHC pipe pile prepared based on the low-carbon gel material is a green building material and has good economic, social and environmental benefits.
(2) Due to the chemical excitation effect, the concrete can form a large amount of C-S-H gel at early stage, and has high early strength and short setting time. The special alkaline retarder can be utilized to regulate and control the concrete setting and hardening process, and is applied to PHC pipe pile production, so that the pipe pile concrete setting time can be shortened, the pipe pile centrifugal static stop time can be shortened, the turnover of PHC pipe pile dies can be accelerated, and the production period can be shortened. Therefore, compared with the traditional PHC pipe pile, the C80 concrete PHC pipe pile prepared based on the low-carbon gel material has the advantages of short production period, high efficiency and capability of effectively improving the enterprise benefit.
(3) The concrete has the advantages of high strength, low permeability and the like, and has excellent properties of chlorine salt resistance, sulfate corrosion resistance, freeze-thawing cycle resistance and the like. PHC pipe pile has higher requirement on durability because of being buried underground for a long time. Compared with the traditional PHC pipe pile, the C80 concrete PHC pipe pile prepared based on the low-carbon gel material has more excellent durability and longer service life.
(4) The steel slag has low activity, contains ƒ -CaO and ƒ -MgO, has poor stability, and is limited in use. The technology adopts an autoclaved technology to effectively excite the activity of the steel slag, and autoclaved curing can promote ƒ -CaO and ƒ -MgO in the steel slag to participate in hydration reaction in early stage, so that hidden trouble of poor stability in later stage is eliminated. The PHC pipe pile production adopts a secondary steaming system, so that the concrete is applied to PHC pipe pile production, and the steel slag utilization rate can be effectively improved.
(5) The PHC tubular pile concrete formula based on the low-carbon gel material adopts cementing materials with different grain sizes, and compared with the single general cement material, the PHC tubular pile concrete formula adopts the step grading of slag, steel slag and grinding sand, and forms a reasonable grading system by adding mixed sand and stones, so that the maximum compactness is achieved, the PHC tubular pile concrete structure is more compact, and the performance is further improved.
Detailed Description
In order to make the contents of the present invention more easily understood, the technical scheme of the present invention will be further described with reference to the specific embodiments, but the present invention is not limited to this range.
Example 1
The PHC pipe pile produced by the low-carbon gel material consists of concrete and reinforcing steel bars; namely, the reinforcement cage is well connected with the prestress tensioning and fixing device, the reinforcement cage is placed into a prestress tubular pile die, concrete is poured, the locking die is tensioned and centrifugally molded, normal-pressure steam curing is carried out, and the reinforcement cage is demolded and pressure steam curing is carried out after the demolding strength is reached.
The concrete consists of cementing materials, stones, mixed sand, water and retarder. Wherein the dosage of each component is as follows:
grinding sand 100kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Slag 280kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the 30kg/m steel slag 3 The method comprises the steps of carrying out a first treatment on the surface of the 76kg/m of excitant 3 The method comprises the steps of carrying out a first treatment on the surface of the 1200kg/m stone 3 The method comprises the steps of carrying out a first treatment on the surface of the 650kg/m of mixed sand 3 The method comprises the steps of carrying out a first treatment on the surface of the 120kg/m of water 3 The method comprises the steps of carrying out a first treatment on the surface of the Special alkaline retarder 2.2kg/m 3 . The dry apparent density of the alkali-activated concrete is 2458.2kg/m 3 。
The special alkaline retarder is compounded by barium salt and sodium gluconate, and is suitable for the low-carbon gelling material system.
The fine sand is made by grinding natural river sand with a machine, the silicon dioxide content is more than 80%, the specific surface area is 450m 2 /kg; the slag adopts S95 slag with a specific surface area of 550m 2 /kg; specific surface area of steel slag 550m 2 /kg。
The exciting agent adopts industrial water glass with the modulus of 3.3, and industrial NaOH (sodium hydroxide) is used for adjusting the modulus to 1.0 in advance.
A preparation method of PHC pipe pile produced by low carbon gel material comprises the following steps:
the production is carried out by utilizing the factory equipment of the prestressed high-strength concrete pipe pile, firstly, slag, steel slag, ground sand, stones and mixed sand are mixed evenly according to the proportion, then retarder is dissolved in water and water glass, and the retarder and the water glass are added into the mixture for mixing and stirring for not less than 3min; pouring alkali slag-steel slag concrete into a prestressed pipe pile die which is put into a reinforcement cage in advance, tensioning the prestressed tendons, centrifugally forming, then conveying the die into a steam curing pool (controlling the steam curing temperature in the pool to be 80 ℃) for steam curing for 6-8 hours, and demoulding after the steam curing is finished, reaching demoulding strength; feeding the PHC pipe pile after demoulding into an autoclave of a factory for steam curing; autoclaved curing is specifically carried out by heating up and boosting for 3 hours, keeping constant temperature and pressure for 8 hours, reducing pressure for 3.5 hours, keeping constant temperature at 180 ℃ and keeping constant pressure at 1.0MPa; and after curing, obtaining a finished product.
The average autoclaved compressive strength is 75.3MPa, and the autoclaved compressive strength is 101.3MPa, so that the tubular pile meets the strength and production requirements of the tubular pile.
The foregoing description is only of the preferred embodiments of the invention, and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Example 2
The PHC pipe pile produced by the low-carbon gel material consists of concrete and reinforcing steel bars; namely, the reinforcement cage is well connected with the prestress tensioning and fixing device, the reinforcement cage is placed into a prestress tubular pile die, concrete is poured, the locking die is tensioned and centrifugally molded, normal-pressure steam curing is carried out, and the reinforcement cage is demolded and pressure steam curing is carried out after the demolding strength is reached.
The concrete consists of cementing materials, stones, mixed sand, water and retarder. Wherein the dosage of each component is as follows:
grinding sand 126 kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Slag 216 kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the 40 kg/m steel slag 3 The method comprises the steps of carrying out a first treatment on the surface of the 104kg/m of excitant 3 The method comprises the steps of carrying out a first treatment on the surface of the Stone 1220kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the 670kg/m mixed sand 3 The method comprises the steps of carrying out a first treatment on the surface of the 100kg/m of water 3 The method comprises the steps of carrying out a first treatment on the surface of the Special alkaline retarder 6.6kg/m 3 . The dry apparent density of the alkali-activated concrete is 2482.6kg/m 3 。
The special alkaline retarder is compounded by barium salt and sodium gluconate, and is suitable for the low-carbon gelling material system.
The fine sand is made by grinding natural river sand with a machine, the silicon dioxide content is more than 80%, the specific surface area is 450m 2 /kg; the slag adopts S95 slag with a specific surface area of 550m 2 /kg; specific surface area of steel slag 550m 2 /kg。
The exciting agent adopts industrial water glass with the modulus of 3.3, and industrial NaOH (sodium hydroxide) is used for adjusting the modulus to 1.5 in advance.
A preparation method of PHC pipe pile produced by low carbon gel material comprises the following steps:
the production is carried out by utilizing the factory equipment of the prestressed high-strength concrete pipe pile, firstly, slag, steel slag, ground sand, stones and mixed sand are mixed evenly according to the proportion, then retarder is dissolved in water and water glass, and the retarder and the water glass are added into the mixture for mixing and stirring for not less than 3min; pouring alkali slag-steel slag concrete into a prestressed pipe pile die which is put into a reinforcement cage in advance, tensioning the prestressed tendons, centrifugally forming, then conveying the die into a steam curing pool (controlling the steam curing temperature in the pool to be 80 ℃) for steam curing for 6-8 hours, and demoulding after the steam curing is finished, reaching demoulding strength; feeding the PHC pipe pile after demoulding into an autoclave of a factory for steam curing; autoclaved curing is specifically carried out by heating up and boosting for 3 hours, keeping constant temperature and pressure for 8 hours, reducing pressure for 3.5 hours, keeping constant temperature at 180 ℃ and keeping constant pressure at 1.0MPa; and after curing, obtaining a finished product.
The average steaming compressive strength is 70.3MPa, the steaming compressive strength is 95.2MPa, and the strength and the production requirements of the tubular pile are met.
The foregoing description is only of the preferred embodiments of the invention, and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Example 3
The PHC pipe pile produced by the low-carbon gel material consists of concrete and reinforcing steel bars; namely, the reinforcement cage is well connected with the prestress tensioning and fixing device, the reinforcement cage is placed into a prestress tubular pile die, concrete is poured, the locking die is tensioned and centrifugally molded, normal-pressure steam curing is carried out, and the reinforcement cage is demolded and pressure steam curing is carried out after the demolding strength is reached.
The concrete consists of cementing materials, stones, mixed sand, water and retarder. Wherein the dosage of each component is as follows:
grinding sand 126 kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Slag 180 kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the 80kg/m steel slag 3 The method comprises the steps of carrying out a first treatment on the surface of the 130kg/m of excitant 3 The method comprises the steps of carrying out a first treatment on the surface of the 1300kg/m of stone 3 The method comprises the steps of carrying out a first treatment on the surface of the 750kg/m of mixed sand 3 The method comprises the steps of carrying out a first treatment on the surface of the 70kg/m of water 3 The method comprises the steps of carrying out a first treatment on the surface of the Special alkaline retarder 10kg/m 3 . The dry apparent density of the alkali-activated concrete is 2646kg/m 3 。
The special alkaline retarder is prepared by compounding barium salt and sodium gluconate, and is suitable for the low-carbon gelling material system.
The fine sand is made by grinding natural river sand with a machine, the silicon dioxide content is more than 80%, the specific surface area is 450m 2 /kg; the slag adopts S95 slag with a specific surface area of 550m 2 /kg; specific surface area of steel slag 550m 2 /kg。
The exciting agent adopts industrial water glass with the modulus of 3.3, and industrial NaOH (sodium hydroxide) is used for adjusting the modulus to 2.0 in advance.
A preparation method of PHC pipe pile produced by low carbon gel material comprises the following steps:
the production is carried out by utilizing the factory equipment of the prestressed high-strength concrete pipe pile, firstly, slag, steel slag, ground sand, stones and mixed sand are mixed evenly according to the proportion, then retarder is dissolved in water and water glass, and the retarder and the water glass are added into the mixture for mixing and stirring for not less than 3min; pouring alkali slag-steel slag concrete into a prestressed pipe pile die which is put into a reinforcement cage in advance, tensioning the prestressed tendons, centrifugally forming, then conveying the die into a steam curing pool (controlling the steam curing temperature in the pool to be 80 ℃) for steam curing for 6-8 hours, and demoulding after the steam curing is finished, reaching demoulding strength; feeding the PHC pipe pile after demoulding into an autoclave of a factory for steam curing; autoclaved curing is specifically carried out by heating up and boosting for 3 hours, keeping constant temperature and pressure for 8 hours, reducing pressure for 3.5 hours, keeping constant temperature at 180 ℃ and keeping constant pressure at 1.0MPa; and after curing, obtaining a finished product.
The average autoclaved compressive strength is 63.2MPa, and the autoclaved compressive strength is 87.5MPa, so that the tubular pile meets the strength and production requirements of the tubular pile.
The foregoing description is only of the preferred embodiments of the invention, and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (5)
1. PHC tubular pile based on low carbon gel material, its characterized in that: the concrete comprises concrete and a reinforcement cage, wherein the strength grade of the concrete is C80, and the concrete consists of slag, steel slag, grinding sand, an exciting agent, stones, mixed sand, water and a special alkaline retarder; wherein the dosage of each component is as follows: 180-280 kg/m of slag 3 The method comprises the steps of carrying out a first treatment on the surface of the 30-130 kg/m of steel slag 3 The method comprises the steps of carrying out a first treatment on the surface of the 30-130 kg/m of grinding sand 3 The method comprises the steps of carrying out a first treatment on the surface of the 70-130 kg/m of exciting agent 3 The method comprises the steps of carrying out a first treatment on the surface of the 1200-1300 kg/m of stone 3 The method comprises the steps of carrying out a first treatment on the surface of the 650-750 kg/m of mixed sand 3 The method comprises the steps of carrying out a first treatment on the surface of the 70-120 kg/m of water 3 The method comprises the steps of carrying out a first treatment on the surface of the Special alkaline retarder 2-10 kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The concrete has a dry apparent density of 2300-2800 kg/m 3 。
2. The PHC pile based on low carbon gel material according to claim 1, wherein: the special alkaline retarder is compounded by barium salt and sodium gluconate, and is suitable for the low-carbon gelling material system.
3. The PHC pile based on low carbon gel material according to claim 1, wherein: the fine sand is formed by grinding natural river sand by a machine, the silicon dioxide content is more than 80 percent, and the specific surface area is not less than 400m 2 /kg; the slag adopts S95 slag with specific surface area of 350-450 m 2 /kg; the specific surface area of the steel slag is 400-600 m 2 /kg。
4. The PHC pile based on low carbon gel material according to claim 1, wherein: the exciting agent adopts industrial water glass with the modulus of 3.0-3.3, and sodium hydroxide is used for adjusting the modulus to 1.0-2.0 in advance for standby.
5. The method for preparing the PHC tubular pile based on the low-carbon gel material according to any one of claims 1-4, which is characterized in that: the method comprises the following steps:
1) Mixing slag, steel slag, fine sand, stones and mixed sand uniformly in proportion, dissolving a special alkaline retarder in water, adding the special alkaline retarder and an exciting agent, mixing and stirring to form a concrete mixture, wherein the total stirring time is not less than 3min;
2) Connecting the reinforcement cage with a prestress tensioning and fixing device, placing the reinforcement cage into a prestress tubular pile die, pouring concrete mixture, then closing the die, tensioning the prestress and centrifuging;
3) After centrifugal molding, the mold is sent into a steam curing pool for 7+/-1 hours, and then is demoulded, and the steam curing temperature in the pool is controlled to be 80+/-10 ℃;
4) And (3) delivering the demolded PHC pipe pile into an autoclave for 8-15 hours for autoclaved curing, wherein the specific curing mode is as follows: raising the temperature and the pressure for 1.5-3.5 hours, keeping the temperature and the pressure for 5-8 hours, lowering the temperature and the pressure for 1.5-3.5 hours, wherein the steam pressure in the autoclave is 1.0+/-0.1 MPa at the constant temperature and the pressure and the temperature is 180-200 ℃; and after curing, obtaining a finished product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310031288.8A CN116283076A (en) | 2023-01-10 | 2023-01-10 | PHC pipe pile based on low-carbon gel material and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1431090A (en) * | 2003-02-12 | 2003-07-23 | 蒋元海 | Technical method for producing prestress pipe pile of centrifugal strong concrete with fine grinding steel slag being mixed into |
| CN104446310A (en) * | 2014-12-02 | 2015-03-25 | 马鞍山宏泰建材股份有限公司 | Concrete formula and preparation method of concrete pipe pile |
| KR20150135738A (en) * | 2014-05-23 | 2015-12-03 | 주식회사 포스코 | Concrete composition for phc pile containing furnace blast slag and the method for preparing phc pile by using the same |
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- 2023-01-10 CN CN202310031288.8A patent/CN116283076A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1431090A (en) * | 2003-02-12 | 2003-07-23 | 蒋元海 | Technical method for producing prestress pipe pile of centrifugal strong concrete with fine grinding steel slag being mixed into |
| KR20150135738A (en) * | 2014-05-23 | 2015-12-03 | 주식회사 포스코 | Concrete composition for phc pile containing furnace blast slag and the method for preparing phc pile by using the same |
| CN104446310A (en) * | 2014-12-02 | 2015-03-25 | 马鞍山宏泰建材股份有限公司 | Concrete formula and preparation method of concrete pipe pile |
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| 张晏清: "《碱激发矿渣水泥和混凝土》", 西南交通大学出版社, pages: 113 - 114 * |
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