CN111003988A - C105 non-autoclaved tubular pile for cold area and preparation method thereof - Google Patents
C105 non-autoclaved tubular pile for cold area and preparation method thereof Download PDFInfo
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- CN111003988A CN111003988A CN201910820596.2A CN201910820596A CN111003988A CN 111003988 A CN111003988 A CN 111003988A CN 201910820596 A CN201910820596 A CN 201910820596A CN 111003988 A CN111003988 A CN 111003988A
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
-
- 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 discloses a C105 non-autoclaved tubular pile for a cold area, which is prepared from the following components in parts by mass: 400-450 parts of cement, 120-140 parts of water, 80-100 parts of mineral powder, 30-70 parts of silica fume, 30-70 parts of microbead fly ash, 600-700 parts of medium sand, 1700-800 parts of crushed stone, 2450-550 parts of crushed stone and 10-15 parts of an additive; the invention also provides a preparation method of the C105 non-autoclaved tubular pile for the cold area, which comprises the steps of putting the framework cage into a mould, feeding concrete slurry, and sequentially carrying out tensioning, forming and curing to obtain the C105 non-autoclaved tubular pile. According to the invention, the strength and durability of the C105 non-autoclaved tubular pile are improved by utilizing the internal reaction of the cementing material and the filling effect of the mixture of the aggregate and the cementing material, so that the non-autoclaved tubular pile is not required to be autoclaved and cured, and is suitable for cold regions; the preparation method is simple and easy to realize.
Description
Technical Field
The invention belongs to the technical field of concrete pipe piles, and particularly relates to a C105 non-autoclaved pipe pile for a cold area and a preparation method thereof.
Background
As an important pile foundation material, the concrete pipe pile has the advantages of high bearing capacity, quickness and convenience in construction, short construction period, economy, environmental friendliness and the like, and is widely applied to treatment of large engineering foundations. In recent years, with the continuous and rapid development of national economic construction, the market demand for prestressed pipe piles is rapidly increased, the prestressed concrete pipe pile industry is rapidly developed, and meanwhile, higher requirements on energy conservation, environmental protection, performance, quality and economy of PHC (prestressed high-strength concrete pipe piles) are provided.
Currently, most of tubular pile production enterprises adopt two-stage curing, namely steam curing and steam pressure curing, in the tubular pile production, wherein the steam curing is normal pressure curing at 80-95 ℃, and the steam pressure curing is pressurized curing at 0.9-1.0 MPa and 170-180 ℃. The two-section type curing system can ensure that the pipe pile basically reaches the factory strength in a curing period, but has the defects of high energy consumption, poor durability of the pipe pile, large potential safety hazard and the like in the curing process.
The non-autoclaved technology is realized in C80 tubular pile concrete by some domestic manufacturers, and the effect is good. In recent years, with the continuous development of concrete technology, ultra-high-strength concrete such as C100 and C120 is frequently used, but due to the difference between commercial concrete and pipe pile concrete in the forming process and the curing process, research data and application examples of C105 non-autoclaved pipe piles are kept in China.
At present, manufacturers for realizing the non-autoclaved technology in China mainly concentrate on the southern area, the strength of the tubular piles in the areas can be continuously increased at local high air temperature after the tubular piles leave factories, and even steam curing and non-autoclaved (double-free) measures, namely the solar shed curing measures, are researched to prepare the PHC tubular piles. In cold areas, the daily average temperature is lower than 20 ℃ most of the time every year, the strength of the tubular pile in the natural environment is increased very slowly, and particularly the tubular pile with high strength grade such as C105 is difficult to achieve, so steam curing and steam pressure curing are needed to ensure that the tubular pile reaches the designed strength in a short time.
Disclosure of Invention
The invention aims to solve the technical problem of providing a C105 non-autoclaved pipe pile for cold regions aiming at the defects of the prior art. The tubular pile adopts cement, mineral powder, silica fume and micro-bead fly ash to form a cementing material, and the strength and durability of the C105 non-autoclaved tubular pile are improved by utilizing the internal reaction of the cementing material and the filling effect of the mixture of aggregate and the cementing material, so that the high-strength C105 non-autoclaved tubular pile can be obtained without autoclaved curing, the energy consumption required by the autoclaved curing is avoided, the cost is reduced, and the tubular pile is suitable for cold areas.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: the C105 non-autoclaved tubular pile for the cold region is characterized by being prepared from the following components in parts by mass: 400-450 parts of cement, 120-140 parts of water, 80-100 parts of mineral powder, 30-70 parts of silica fume, 30-70 parts of microbead fly ash, 600-700 parts of medium sand, 1700-800 parts of crushed stone, 2450-550 parts of crushed stone and 10-15 parts of an additive; the particle size of the broken stone 1 is 5-16 mm, and the particle size of the broken stone 2 is larger than 16mm and not more than 31.5 mm.
The C105 non-autoclaved tubular pile of the invention takes the medium sand, the broken stone 1 and the broken stone 2 as aggregates and takes the cement, the mineral powder, the silica fume and the micro-bead fly ash as a cementing material system to prepare the concrete, the cementing material system with the mixture ratio except the cement hydrates to form main hydration products such as C-S-H colloid, CH and the like, and the SiO in the silica fume is in an amorphous state and has extremely high activity2The method has the advantages that the silica sol reacts with water to generate silica sol, the HO & H hydrogen bond combination is changed into Si-O-Si polar bond combination through dehydration reaction between the silica sol to form a network structure, higher early strength is provided, mineral powder plays a filling role among silica fume, micro-bead fly ash and cement particles, the workability of concrete mixture is effectively improved, and the later strength and durability of the C105 steam-free pipe pile are improved; while cement hydration continues, SiO2The main chemical component of the micro-bead fly ash with the advantages of high activity, low hydration heat, high compressive strength, strong fluidity, good thermal stability and the like is SiO2And Al2O3Ca (OH) released by hydration reaction with cement2Can react rapidly to form calcium silicate and ettringite hydrate, fill the gaps of cement structure, and further improve C105 immunityThe strength and durability of the autoclaved tubular pile; in addition, the particle size of the micro-bead fly ash is small, the particle shape is regular spherical, and the micro-bead fly ash has good ball effect and filling property, so that the micro-bead fly ash has a low water demand ratio, and the water-cement ratio and the viscosity of concrete slurry are reduced. Therefore, the aggregate and the cementing material system with the mixing ratio of the invention have good filling effect after being mixed, and the strength of the C105 non-autoclaved pipe pile is enhanced, so that the high-strength C105 non-autoclaved pipe pile can be obtained without autoclaving, the energy consumption required by autoclaving is avoided, the cost is reduced, and the invention is suitable for cold areas.
The C105 non-autoclaved tubular pile for the cold region is characterized by being prepared from the following components in parts by mass: 400-440 parts of cement, 120-130 parts of water, 80-90 parts of mineral powder, 30-50 parts of silica fume, 30-50 parts of microbead fly ash, 600-650 parts of medium sand, 1700-750 parts of broken stone, 2450-500 parts of broken stone and 11-14 parts of an additive. The preparation components are beneficial to promoting the interaction between the aggregate and a cementing material system, so that the strength and the durability of the C105 non-autoclaved pipe pile are further enhanced.
The C105 non-autoclaved tubular pile for the cold region is characterized in that the cement is P. O52.5R cement, and the mineral powder is S95 grade mineral powder. The cement and the mineral powder are all common models in the industry, and the application range of the invention is further expanded.
The C105 non-autoclaved tubular pile for the cold region is characterized in that the admixture is an early-strength polycarboxylic acid high-performance water reducing agent. The early-strength polycarboxylic acid high-performance water reducing agent has good compatibility with cement, high water reducing rate and small addition amount, can effectively improve the early strength of concrete, effectively reduces the water-cement ratio while adjusting the workability of concrete slurry, reduces the later shrinkage of the concrete, and further improves the strength and durability of the C105 non-autoclaved pipe pile; in addition, the content of chloride ions and the content of alkali in the early-strength polycarboxylic acid high-performance water reducing agent are both low, and the environmental protection of the C105 non-autoclaved pipe pile is favorably improved.
In addition, the invention also provides a method for preparing the C105 non-autoclaved pipe pile for the cold region, which is characterized by comprising the following steps:
step one, preparing a framework cage;
step two, uniformly mixing the medium sand, the broken stone 1, the broken stone 2 and water, then adding cement, mineral powder, silica fume, microbead fly ash and an additive, and uniformly stirring to obtain concrete slurry;
step three, placing the framework cage prepared in the step one into a mould, then feeding the concrete slurry obtained in the step two, and obtaining a C105 non-autoclaved tubular pile semi-finished product after pre-stress tensioning;
and step four, carrying out centrifugal forming on the C105 non-autoclaved tubular pile semi-finished product obtained in the step three, discharging centrifugal residual slurry, standing, heating to 90-100 ℃ for 2-2.5 h, carrying out constant-temperature curing, demoulding, naturally cooling to room temperature, and carrying out natural curing to obtain the C105 non-autoclaved tubular pile.
The preparation method of the C105 non-autoclaved pipe pile is simple, the designed strength can be achieved without autoclaving, and the application range of the C105 non-autoclaved pipe pile is expanded.
The method is characterized in that the time for stirring uniformly in the step two is 180-240 s. The time ensures that all the components are fully and uniformly stirred.
The method is characterized in that the centrifugal molding system in the fourth step is as follows: firstly centrifuging at the speed of 100 r/min-140 r/min for 3 min-5 min, then centrifuging at the speed of 280 r/min-320 r/min for 5 min-7 min, and then centrifuging at the speed of 400 r/min-440 r/min for 8 min-10 min. The centrifugal forming system enables the semi-finished product of the C105 non-autoclaved tubular pile to fully form a compact structure, effectively prevents the layering phenomenon, and improves the quality of the C105 non-autoclaved tubular pile.
The method is characterized in that the standing temperature in the fourth step is 33-37 ℃, and the standing time is 1.5 h; in the constant-temperature maintenance process, when the daily average temperature is higher than 20 ℃, the constant-temperature maintenance time is 4 hours, and when the daily average temperature is not higher than 20 ℃, the constant-temperature maintenance time is 7 hours; the natural curing time is 7 days, in the natural curing process, when the daily average temperature is higher than 20 ℃, the curing is carried out in a wet spraying mode until the surface of the C105 non-autoclaved tubular pile semi-finished product is fully wetted, and the wet spraying frequency is 3 times per day. The standing time ensures that all components in the C105 non-autoclaved tubular pile semi-finished product are sufficiently stable after centrifugation; the constant-temperature maintenance time ensures the effective increase of the strength of the C105 non-autoclaved pipe pile; the natural curing process further promotes the stability of each component in the C105 non-autoclaved tubular pile, and simultaneously avoids the crack of the C105 non-autoclaved tubular pile caused by drying.
The method is characterized in that the strength of the C105 non-autoclaved pipe pile in the fourth step is larger than 105 MPa. The C105 non-autoclaved tubular pile with the strength can be applied to the conditions with ultrahigh strength requirements or complex construction geological environment, and the application range of the C105 non-autoclaved tubular pile is further expanded.
Compared with the prior art, the invention has the following advantages:
1. on the basis of the preparation components of the existing C80 tubular pile, the invention adopts cement, mineral powder, silica fume and micro-bead fly ash to form a cementing material system, and the silica fume has high-activity SiO2Reacts with water to form silica sol, forms a network structure through dehydration reaction, provides higher early strength, SiO2The C105 non-autoclaved tubular pile has the advantages that the C105 non-autoclaved tubular pile is further promoted to be subjected to the volcanic ash reaction with CH, mineral powder plays a filling role among silicon ash, micro-bead fly ash and cement particles, the workability of concrete mixtures is effectively improved, the later strength and durability of the C105 non-autoclaved tubular pile are improved, and SiO in the micro-bead fly ash2And Al2O3Ca (OH) released by hydration reaction with cement2Calcium silicate and ettringite hydrate are formed by reaction, gaps of a cement structure are filled, the strength and durability of the C105 non-autoclaved tubular pile are further improved, and the water-cement ratio and the viscosity of concrete slurry are reduced, so that the C105 non-autoclaved tubular pile can have high strength without being autoclaved, and energy consumption required by autoclaved curing is avoidedThe energy consumption and the cost are reduced, and the method is suitable for cold areas.
2. The cementing material system of the C105 non-autoclaved pipe pile consists of cement, mineral powder, micro-bead fly ash and silica fume, the four components respectively play different roles in the early stage and the later stage of the hydration of the C105 non-autoclaved pipe pile concrete, and the strength and the compactness of the C105 non-autoclaved pipe pile are improved, so that the strength required by design is quickly achieved in a short period on the premise of ensuring the durability of the C105 non-autoclaved pipe pile, autoclaved curing is not needed, the production efficiency is improved, the equipment investment is reduced, the energy consumption is reduced, and the potential safety hazard is reduced.
3. The C105 non-autoclaved tubular pile disclosed by the invention does not need autoclaved curing, avoids the phenomenon that the concrete brittleness is increased due to the fact that the forming speed of the internal structure of the concrete is too high due to autoclaved oxidation and the crystal-to-rubber ratio is larger because a large number of coarse crystals are formed in the crystal structure, and improves the service performance of the C105 non-autoclaved tubular pile.
4. The C105 non-autoclaved tubular pile disclosed by the invention does not need autoclaved curing, avoids the generation of cracks on a pile body caused by temperature difference in the cooling process after autoclaved curing, improves the durability of the tubular pile, saves the autoclaved curing and cooling time, and further improves the production efficiency.
5. The preparation method of the C105 non-autoclaved tubular pile is simple and easy to implement.
The present invention will be described in further detail with reference to examples.
Detailed Description
Example 1
The C105 non-autoclaved tubular pile for the cold region is prepared from the following components in parts by mass: 410 parts of P & O52.5R cement, 125 parts of water, 90 parts of S95-grade mineral powder, 35 parts of silica fume, 40 parts of microbead fly ash, 650 parts of medium sand, 1740 parts of broken stone, 2480 parts of broken stone and 12 parts of early-strength polycarboxylic acid high-performance water reducing agent; the particle size of the broken stone 1 is 5-16 mm, and the particle size of the broken stone 2 is larger than 16mm and not more than 31.5 mm.
The preparation method of the C105 non-autoclaved tubular pile for the cold region in the embodiment comprises the following steps:
step one, preparing a framework cage;
step two, uniformly mixing 650 parts of medium sand, 740 parts of crushed stone 1, 480 parts of crushed stone 2 and 125 parts of water, then adding 410 parts of P. O52.5R cement, 90 parts of S95-grade mineral powder, 35 parts of silica fume, 40 parts of micro-bead fly ash and 12 parts of early-strength polycarboxylic acid high-performance water reducing agent, and uniformly stirring for 180S to obtain concrete slurry;
step three, placing the framework cage prepared in the step one into a mould, then feeding the concrete slurry obtained in the step two, and obtaining a C105 non-autoclaved tubular pile semi-finished product after pre-stress tensioning;
step four, carrying out centrifugal forming on the C105 non-autoclaved tubular pile semi-finished product obtained in the step three, discharging centrifugal residual slurry, standing for 1.5 hours at 33-37 ℃, then heating to 90 ℃ within 2 hours for constant-temperature curing for 4 hours, demoulding, naturally cooling to room temperature, and then carrying out natural curing for 7 days, wherein a wet spraying mode is adopted for curing in the natural curing process until the surface of the C105 non-autoclaved tubular pile semi-finished product is fully wetted, and the wet spraying frequency is 3 times/day, so as to obtain the C105 non-autoclaved tubular pile; the centrifugal molding system comprises the following steps: firstly, centrifuging at a speed of 100r/min for 3min, then centrifuging at a speed of 300r/min for 5min, and then centrifuging at a speed of 440r/min for 8 min.
Comparative example 1
This comparative example differs from example 1 in that: and (3) curing the C105 tubular pile semi-finished product subjected to constant-temperature curing and demolding in the fourth step for 6 hours under the conditions that the steam pressure is 0.95-1 MPa and the temperature is 170-180 ℃ to obtain the C105 tubular pile.
Example 2
The C105 non-autoclaved tubular pile for the cold region is prepared from the following components in parts by mass: 420 parts of P O52.5R cement, 120 parts of water, 85 parts of S95-grade mineral powder, 40 parts of silica fume, 45 parts of microbead fly ash, 680 parts of medium sand, 1760 parts of broken stone, 2450 parts of broken stone and 13 parts of an early-strength polycarboxylic acid high-performance water reducing agent; the particle size of the broken stone 1 is 5-16 mm, and the particle size of the broken stone 2 is larger than 16mm and not more than 31.5 mm.
The preparation method of the C105 non-autoclaved tubular pile for the cold region in the embodiment comprises the following steps:
step one, preparing a framework cage;
step two, uniformly mixing 680 parts of medium sand, 760 parts of crushed stone 1, 450 parts of crushed stone 2 and 120 parts of water, then adding 420 parts of P. O52.5R cement, 85 parts of S95-grade mineral powder, 40 parts of silica fume, 45 parts of microbead fly ash and 13 parts of early strength type polycarboxylic acid high-performance water reducing agent, and uniformly stirring for 190 seconds to obtain concrete slurry;
step three, placing the framework cage prepared in the step one into a mould, then feeding the concrete slurry obtained in the step two, and obtaining a C105 non-autoclaved tubular pile semi-finished product after pre-stress tensioning;
step four, carrying out centrifugal forming on the C105 non-autoclaved tubular pile semi-finished product obtained in the step three, discharging centrifugal residual slurry, standing for 1.5 hours at 33-37 ℃, then heating to 95 ℃ within 2 hours for constant-temperature curing for 4 hours, demoulding, naturally cooling to room temperature, and then carrying out natural curing for 7 days, wherein a wet spraying mode is adopted for curing in the natural curing process until the surface of the C105 non-autoclaved tubular pile semi-finished product is fully wetted, and the wet spraying frequency is 3 times/day, so as to obtain the C105 non-autoclaved tubular pile; the centrifugal molding system comprises the following steps: firstly, centrifuging at the speed of 140r/min for 4min, then centrifuging at the speed of 280r/min for 7min, and then centrifuging at the speed of 400r/min for 10 min.
Example 3
The C105 non-autoclaved tubular pile for the cold region is prepared from the following components in parts by mass: 420 parts of P & O52.5R cement, 130 parts of water, 80 parts of S95-grade mineral powder, 30 parts of silica fume, 30 parts of microbead fly ash, 700 parts of medium sand, 1750 parts of broken stone, 2500 parts of broken stone and 11 parts of an early-strength polycarboxylic acid high-performance water reducing agent; the particle size of the broken stone 1 is 5-16 mm, and the particle size of the broken stone 2 is larger than 16mm and not more than 31.5 mm.
The preparation method of the C105 non-autoclaved tubular pile for the cold region in the embodiment comprises the following steps:
step one, preparing a framework cage;
step two, uniformly mixing 700 parts of medium sand, 750 parts of crushed stone 1, 500 parts of crushed stone 2 and 130 parts of water, then adding 420 parts of P. O52.5R cement, 80 parts of S95-grade mineral powder, 30 parts of silica fume, 30 parts of microbead fly ash and 12 parts of early strength type polycarboxylic acid high-performance water reducing agent, and uniformly stirring for 200S to obtain concrete slurry;
step three, placing the framework cage prepared in the step one into a mould, then feeding the concrete slurry obtained in the step two, and obtaining a C105 non-autoclaved tubular pile semi-finished product after pre-stress tensioning;
step four, carrying out centrifugal forming on the C105 non-autoclaved tubular pile semi-finished product obtained in the step three, discharging centrifugal residual slurry, standing for 1.5h at 33-37 ℃, heating to 90 ℃ within 2.5h, carrying out constant-temperature curing for 7h, demoulding, naturally cooling to room temperature, and carrying out natural curing for 7 days to obtain a C105 non-autoclaved tubular pile; the centrifugal molding system comprises the following steps: firstly centrifuging at the speed of 120r/min for 5min, then centrifuging at the speed of 320r/min for 6min, and then centrifuging at the speed of 410r/min for 9 min.
Example 4
The C105 non-autoclaved tubular pile for the cold region is prepared from the following components in parts by mass: 430 parts of P & O52.5R cement, 135 parts of water, 95 parts of S95-grade mineral powder, 50 parts of silica fume, 50 parts of microbead fly ash, 600 parts of medium sand, 1720 parts of broken stone, 2520 parts of broken stone and 14 parts of an early-strength polycarboxylic acid high-performance water reducing agent; the particle size of the broken stone 1 is 5-16 mm, and the particle size of the broken stone 2 is larger than 16mm and not more than 31.5 mm.
The preparation method of the C105 non-autoclaved tubular pile for the cold region in the embodiment comprises the following steps:
step one, preparing a framework cage;
step two, uniformly mixing 600 parts of medium sand, 720 parts of crushed stone 1, 520 parts of crushed stone 2 and 135 parts of water, then adding 430 parts of P. O52.5R cement, 95 parts of S95-grade mineral powder, 50 parts of silica fume, 50 parts of micro-bead fly ash and 14 parts of early-strength polycarboxylic acid high-performance water reducer, and uniformly stirring for 210S to obtain concrete slurry;
step three, placing the framework cage prepared in the step one into a mould, then feeding the concrete slurry obtained in the step two, and obtaining a C105 non-autoclaved tubular pile semi-finished product after pre-stress tensioning;
step four, carrying out centrifugal forming on the C105 non-autoclaved tubular pile semi-finished product obtained in the step three, discharging centrifugal residual slurry, standing for 1.5h at 33-37 ℃, heating to 100 ℃ within 2.5h, carrying out constant-temperature curing for 4h, demoulding, naturally cooling to room temperature, and then carrying out natural curing for 7 days, wherein a wet spraying manner is adopted for curing in the natural curing process until the surface of the C105 non-autoclaved tubular pile semi-finished product is sufficiently wetted, and the wet spraying frequency is 3 times per day, so that the C105 non-autoclaved tubular pile is obtained; the centrifugal molding system comprises the following steps: firstly centrifuging at the speed of 110r/min for 3min, then centrifuging at the speed of 290r/min for 7min, and then centrifuging at the speed of 420r/min for 8 min.
Example 5
The C105 non-autoclaved tubular pile for the cold region is prepared from the following components in parts by mass: 440 parts of P O52.5R cement, 140 parts of water, 100 parts of S95-grade mineral powder, 55 parts of silica fume, 40 parts of microbead fly ash, 630 parts of medium sand, 1710 parts of broken stone, 2490 parts of broken stone and 10 parts of early-strength polycarboxylic acid high-performance water reducing agent; the particle size of the broken stone 1 is 5-16 mm, and the particle size of the broken stone 2 is larger than 16mm and not more than 31.5 mm.
The preparation method of the C105 non-autoclaved tubular pile for the cold region in the embodiment comprises the following steps:
step one, preparing a framework cage;
step two, uniformly mixing 630 parts of medium sand, 710 parts of crushed stone 1, 490 parts of crushed stone 2 and 140 parts of water, then adding 440 parts of P. O52.5R cement, 100 parts of S95-grade mineral powder, 55 parts of silica fume, 40 parts of micro-bead fly ash and 10 parts of early-strength polycarboxylic acid high-performance water reducer, and uniformly stirring for 220S to obtain concrete slurry;
step three, placing the framework cage prepared in the step one into a mould, then feeding the concrete slurry obtained in the step two, and obtaining a C105 non-autoclaved tubular pile semi-finished product after pre-stress tensioning;
step four, carrying out centrifugal forming on the C105 non-autoclaved tubular pile semi-finished product obtained in the step three, discharging centrifugal residual slurry, standing for 1.5 hours at 33-37 ℃, heating to 95 ℃ within 2.4 hours, carrying out constant-temperature curing for 7 hours, demoulding, naturally cooling to room temperature, and carrying out natural curing for 7 days to obtain a C105 non-autoclaved tubular pile; the centrifugal molding system comprises the following steps: firstly, the mixture is centrifuged at a speed of 130r/min for 4min, then at a speed of 310r/min for 6min, and then at a speed of 430r/min for 10 min.
Example 6
The C105 non-autoclaved tubular pile for the cold region is prepared from the following components in parts by mass: 450 parts of P & O52.5R cement, 140 parts of water, 100 parts of S95-grade mineral powder, 60 parts of silica fume, 60 parts of microbead fly ash, 640 parts of medium sand, 1700 parts of broken stone, 2550 parts of broken stone and 15 parts of early-strength polycarboxylic acid high-performance water reducing agent; the particle size of the broken stone 1 is 5-16 mm, and the particle size of the broken stone 2 is larger than 16mm and not more than 31.5 mm.
The preparation method of the C105 non-autoclaved tubular pile for the cold region in the embodiment comprises the following steps:
step one, preparing a framework cage;
step two, uniformly mixing 640 parts of medium sand, 700 parts of crushed stone 1, 550 parts of crushed stone 2 and 140 parts of water, then adding 450 parts of P. O52.5R cement, 100 parts of S95-grade mineral powder, 60 parts of silica fume, 60 parts of microbead fly ash and 15 parts of early strength type polycarboxylic acid high-performance water reducing agent, and uniformly stirring for 230S to obtain concrete slurry;
step three, placing the framework cage prepared in the step one into a mould, then feeding the concrete slurry obtained in the step two, and obtaining a C105 non-autoclaved tubular pile semi-finished product after pre-stress tensioning;
step four, carrying out centrifugal forming on the C105 non-autoclaved tubular pile semi-finished product obtained in the step three, discharging centrifugal residual slurry, standing for 1.5 hours at 33-37 ℃, then heating to 100 ℃ within 2 hours for constant-temperature curing for 4 hours, demoulding, naturally cooling to room temperature, and then carrying out natural curing for 7 days, wherein a wet spraying mode is adopted for curing in the natural curing process until the surface of the C105 non-autoclaved tubular pile semi-finished product is fully wetted, and the wet spraying frequency is 3 times/day, so as to obtain the C105 non-autoclaved tubular pile; the centrifugal molding system comprises the following steps: firstly, the mixture is centrifuged at the speed of 100r/min for 5min, then at the speed of 330r/min for 5min, and then at the speed of 400r/min for 8 min.
Example 7
The C105 non-autoclaved tubular pile for the cold region is prepared from the following components in parts by mass: 400 parts of P O52.5R cement, 130 parts of water, 95 parts of S95-grade mineral powder, 70 parts of silica fume, 70 parts of microbead fly ash, 620 parts of medium sand, 1800 parts of crushed stone, 2510 parts of crushed stone and 13 parts of early-strength polycarboxylic acid high-performance water reducing agent; the particle size of the broken stone 1 is 5-16 mm, and the particle size of the broken stone 2 is larger than 16mm and not more than 31.5 mm.
The preparation method of the C105 non-autoclaved tubular pile for the cold region in the embodiment comprises the following steps:
step one, preparing a framework cage;
step two, uniformly mixing 620 parts of medium sand, 720 parts of crushed stone 1, 510 parts of crushed stone 2 and 130 parts of water, then adding 400 parts of P. O52.5R cement, 95 parts of S95-grade mineral powder, 70 parts of silica fume, 70 parts of microbead fly ash and 13 parts of early strength type polycarboxylic acid high-performance water reducing agent, and uniformly stirring for 240S to obtain concrete slurry;
step three, placing the framework cage prepared in the step one into a mould, then feeding the concrete slurry obtained in the step two, and obtaining a C105 non-autoclaved tubular pile semi-finished product after pre-stress tensioning;
step four, carrying out centrifugal forming on the C105 non-autoclaved tubular pile semi-finished product obtained in the step three, discharging centrifugal residual slurry, standing for 1.5 hours at 33-37 ℃, then heating to 95 ℃ within 2 hours, carrying out constant-temperature curing for 7 hours, demoulding, naturally cooling to room temperature, and carrying out natural curing for 7 days to obtain a C105 non-autoclaved tubular pile; the centrifugal molding system comprises the following steps: firstly centrifuging at the speed of 120r/min for 4min, then centrifuging at the speed of 300r/min for 7min, and then centrifuging at the speed of 420r/min for 9 min.
The compressive strength of the C105 non-autoclaved tubular piles prepared in examples 1 to 7 of the present invention and the compressive strength of the C105 tubular pile prepared in comparative example 1 were measured, and the appearance of the core sample of each tubular pile was observed, and the results are shown in table 1 and table 2 below.
Table 1 compressive strength of C105 non-autoclaved pipe pile prepared in examples 1 to 7 and C105 pipe pile prepared in comparative example 1
As can be seen from table 1, the C105 non-autoclaved tubular piles prepared in embodiments 1 to 7 of the present invention all have a 7d compressive strength of more than 105MPa, up to 115MPa, a 28d compressive strength of more than 110MPa, up to 125MPa, and all meet the requirements of GB13476-2009 pretensioned prestressed concrete tubular piles; comparing example 1 with comparative example 1, it can be seen that the compressive strength of C105 non-autoclaved tubular piles at 7d and 28d prepared by the invention is close to the level of the C105 tubular pile prepared by the prior art of comparative example 1 by two-stage curing, i.e. steam curing and autoclave curing.
Table 2 core appearance of C105 non-autoclaved pipe piles prepared in examples 1 to 7 and C105 pipe pile prepared in comparative example 1
As can be seen from table 2, the core appearance of the C105 non-autoclaved tubular pile prepared in examples 1 to 7 of the present invention is even better than that of the C105 tubular pile prepared in the prior art of comparative example 1 by two-stage curing, i.e., steam curing and autoclave curing.
In conclusion, the C105 non-autoclaved pipe pile has excellent compressive strength and core appearance, can meet the actual use requirement, does not need an autoclaved curing process, reduces the preparation cost, and is suitable for cold regions.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (9)
1. The C105 non-autoclaved tubular pile for the cold region is characterized by being prepared from the following components in parts by mass: 400-450 parts of cement, 120-140 parts of water, 80-100 parts of mineral powder, 30-70 parts of silica fume, 30-70 parts of microbead fly ash, 600-700 parts of medium sand, 1700-800 parts of crushed stone, 2450-550 parts of crushed stone and 10-15 parts of an additive; the particle size of the broken stone 1 is 5-16 mm, and the particle size of the broken stone 2 is larger than 16mm and not more than 31.5 mm.
2. The C105 non-autoclaved tubular pile used in the cold region according to claim 1 is characterized by being prepared from the following components in parts by mass: 400-440 parts of cement, 120-130 parts of water, 80-90 parts of mineral powder, 30-50 parts of silica fume, 30-50 parts of microbead fly ash, 600-650 parts of medium sand, 1700-750 parts of broken stone, 2450-500 parts of broken stone and 11-14 parts of an additive.
3. The C105 non-autoclaved tubular pile used in the cold region as claimed in claim 1, wherein the cement is P-O52.5R cement, and the ore powder is S95 grade ore powder.
4. The C105 non-autoclaved tubular pile for the cold regions as claimed in claim 1, wherein the admixture is an early strength type polycarboxylic acid high performance water reducing agent.
5. A method for preparing the C105 non-autoclaved tubular pile used in the cold region according to any one of claims 1 to 4, which is characterized by comprising the following steps:
step one, preparing a framework cage;
step two, uniformly mixing the medium sand, the broken stone 1, the broken stone 2 and water, then adding cement, mineral powder, silica fume, microbead fly ash and an additive, and uniformly stirring to obtain concrete slurry;
step three, placing the framework cage prepared in the step one into a mould, then feeding the concrete slurry obtained in the step two, and obtaining a C105 non-autoclaved tubular pile semi-finished product after pre-stress tensioning;
and step four, carrying out centrifugal forming on the C105 non-autoclaved tubular pile semi-finished product obtained in the step three, discharging centrifugal residual slurry, standing, heating to 90-100 ℃ for 2-2.5 h, carrying out constant-temperature curing, demoulding, naturally cooling to room temperature, and carrying out natural curing to obtain the C105 non-autoclaved tubular pile.
6. The method according to claim 5, wherein the stirring in the second step is performed for 180 to 240 seconds.
7. The method of claim 5, wherein the centrifuge molding protocol in step four is: firstly centrifuging at the speed of 100 r/min-140 r/min for 3 min-5 min, then centrifuging at the speed of 280 r/min-320 r/min for 5 min-7 min, and then centrifuging at the speed of 400 r/min-440 r/min for 8 min-10 min.
8. The method according to claim 5, wherein the temperature of the standing in the fourth step is 33-37 ℃ and the time is 1.5 h; in the constant-temperature maintenance process, when the daily average temperature is higher than 20 ℃, the constant-temperature maintenance time is 4 hours, and when the daily average temperature is not higher than 20 ℃, the constant-temperature maintenance time is 7 hours; the natural curing time is 7 days, in the natural curing process, when the daily average temperature is higher than 20 ℃, the curing is carried out in a wet spraying mode until the surface of the C105 non-autoclaved tubular pile semi-finished product is fully wetted, and the wet spraying frequency is 3 times per day.
9. The method according to claim 5, wherein the strength of the C105 non-autoclaved pipe pile in the fourth step is more than 105 MPa.
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| CN111574185A (en) * | 2020-04-15 | 2020-08-25 | 福建省大地管桩有限公司 | Acid corrosion resistant concrete pipe pile and preparation method thereof |
| CN114853404A (en) * | 2022-05-23 | 2022-08-05 | 惠州市三环构件有限公司 | Early-strength PHC tubular pile concrete and PHC tubular pile |
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| CN105818265A (en) * | 2016-04-22 | 2016-08-03 | 东南大学 | Steam-curing-free prestressed high-strength concrete centrifugal pipe pile material and preparing method thereof |
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Application publication date: 20200414 |