CN103922669B - Prepare the concrete of PHC piles and the preparation method of pile tube - Google Patents
Prepare the concrete of PHC piles and the preparation method of pile tube Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 103
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 64
- 239000002893 slag Substances 0.000 claims abstract description 25
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 22
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 20
- 239000004576 sand Substances 0.000 claims abstract description 19
- 239000011398 Portland cement Substances 0.000 claims abstract description 16
- 238000012423 maintenance Methods 0.000 claims description 29
- 238000003756 stirring Methods 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 13
- 239000011372 high-strength concrete Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 230000015271 coagulation Effects 0.000 claims description 9
- 238000005345 coagulation Methods 0.000 claims description 9
- 239000002689 soil Substances 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 8
- 239000004744 fabric Substances 0.000 claims description 7
- 239000004927 clay Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 claims description 6
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical group [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 4
- 239000007832 Na2SO4 Substances 0.000 claims description 4
- 239000001110 calcium chloride Substances 0.000 claims description 4
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 4
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 3
- 230000003628 erosive effect Effects 0.000 abstract description 10
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 40
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 17
- 239000013505 freshwater Substances 0.000 description 12
- 239000000243 solution Substances 0.000 description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 10
- 238000009792 diffusion process Methods 0.000 description 10
- 230000007613 environmental effect Effects 0.000 description 9
- 239000002994 raw material Substances 0.000 description 8
- 238000010257 thawing Methods 0.000 description 8
- 238000007654 immersion Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 6
- 238000007710 freezing Methods 0.000 description 6
- 239000013535 sea water Substances 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 239000004568 cement Substances 0.000 description 5
- WBZKQQHYRPRKNJ-UHFFFAOYSA-L disulfite Chemical compound [O-]S(=O)S([O-])(=O)=O WBZKQQHYRPRKNJ-UHFFFAOYSA-L 0.000 description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 description 5
- 239000002609 medium Substances 0.000 description 5
- 239000011707 mineral Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 239000011780 sodium chloride Substances 0.000 description 5
- 238000010025 steaming Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000008014 freezing Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 235000011194 food seasoning agent Nutrition 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 238000004448 titration Methods 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000008239 natural water Substances 0.000 description 2
- 230000003204 osmotic effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 235000011158 Prunus mume Nutrition 0.000 description 1
- 244000018795 Prunus mume Species 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 125000001624 naphthyl group Chemical group 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a kind of concrete preparing PHC piles, in this concrete, every cube of concrete is composed of the following components: portland cement: 360 500kg；S95 breeze: 50 150kg；Super finely ground slag: 0 50kg；Sand: 700 750kg；Rubble: 1150 1250kg；Water: 115 151kg；Water reducer: 3.68 5.4kg；Exciting agent: 9.2 10.8kg.This Cost of Concrete is cheap, and has good intensity and corrosion-resistant property.Also providing for the preparation method of this PHC piles, this preparation method is simple to operation simultaneously, advantageously reduces preparation cost, and improves the erosion resistance of pile tube.
Description
Technical field
The present invention relates to a kind of prestressed concrete goods, it particularly relates to one prepares prestressed high strength coagulation
The concrete of soil pile tube and the preparation method of pile tube.
Background introduction
(English full name is prestressed high strength concrete: Prestressed High Strength Concrete Pipe
Piles, is called for short PHC in literary composition) pile tube refers to through the one that the techniques such as pre-tensioned prestressing, centrifugal forming and high-pressure steaming and cultivating produce
Hollow circular uiform section concrete upper member.Compared with other capital construction material, PHC pile tube have excellent in mechanical performance,
Short construction period, cost performance are high and execution conditions limit the advantages such as few, are therefore used widely in building trade.State at present
Inside and outside major part PHC pile tube produces and uses steam curing and the secondary maintenance method of steam press maintenance, and steam press maintenance can improve pipe
Stake production efficiency, is rapidly achieved the performance requirement dispatched from the factory, but this maintenance method energy consumption is big, holding time length and easily cause matter
Amount problem.Under current energy-conserving and environment-protective background, increasing scholar sets about researching and producing and exempts to press steaming PHC pile tube.
Along with the continuous expansion of PHC pile tube range of application, Service Environment weather and in the past had difference more, environment resistance to pile tube
Erosion performance also has more requirement.PHC pile tube applies region, south at first, and in the environment of south, PHC pile tube is generally faced with underground
The erosion of water, and in inclined central and west regions, subsoil water is easily generated chemical erosion material rich in sulfate etc., resistance to PHC pile tube
Performance impact is the biggest for a long time.PHC pile tube is widely used in the ocean engineering such as harbour, Oversea bridge equally in recent years, and PHC pile tube is in sea
Under the environment of ocean, durability obtains the concern of people day by day.PHC pile tube is later in northern areas application, and within 2011, PHC pile tube starts
Use in some northern ports such as Dalian, Yingkou are built.In the north, anti-freezing property requires the highest, the currently used amount of PHC pile tube
Also little, reason is to suspect its freeze proof and anti-ice weight bearing power.
Summary of the invention
Technical problem: the technical problem to be solved is: provide one to prepare prestressed high strength concrete pipe
The concrete of stake, this Cost of Concrete is cheap, and has good intensity and corrosion-resistant property.Also provide for this prestressing force high simultaneously
The preparation method of strength concrete pile tube, this preparation method is simple to operation, advantageously reduces preparation cost, and improves pile tube
Erosion resistance.
Technical scheme: for solving above-mentioned technical problem, the technical solution used in the present invention is:
A kind of concrete preparing PHC piles, in this concrete, every cube of concrete is by following
Component forms:
Further, described super finely ground slag refers to that specific surface area is more than or equal to 800m2/ kg, and the ore deposit of particle diameter≤4 μm
Powder；The specific surface area of S95 breeze is 400 500m2/kg。
Further, the modulus of fineness of described sand is 2.4, and clay content is less than 0.8%.
Further, described exciting agent is inorganic salts.
Further, described exciting agent is CaCl2, or NaSO4。
Further, the solid content of described water reducer is 20%-30%, and water-reducing rate is more than or equal to 25%.
A kind of preparation method utilizing above-mentioned concrete to prepare PHC piles, this preparation method bag
Include procedure below:
The first step: prepare concrete: sand, portland cement, super finely ground slag, exciting agent and S95 breeze are added blender
Middle stirring, after mixing time 0.5-1 minute, adds rubble stirring, adds water, form mixing during stirring rubble
Thing, adds water reducer and water, is stirred 2-3 minute, forms concrete；
Second step: prepare PHC piles: the concrete first step made is put in mould, carry out
Cloth stretch-draw, Shi Hanzhang, then by concrete tubular pile centrifuge to concrete centrifugal molding, obtain prestressed high strength
Concrete tubular pile；
3rd step: carry out maintenance for the first time: use atmospheric steam curing, the prestressed high strength coagulation prepared by second step
Soil pile tube is placed in steam-cured pond, quiet stop 1-2 hour after, be warmed up to 75 80 DEG C with 25 DEG C/h, constant temperature 68 hours, then 1
Room temperature is cooled in hour；
4th step: by PHC piles form removal；
5th step: carry out second time maintenance: naturally watered by the PHC piles after the 4th step form removal
Water curing or water are supported.
Further, in the 5th described step, the curing time of maintenance for the second time is 3 10 days.
Beneficial effect: compared with prior art, technical scheme has the advantages that
(1) durability is good.The PHC pile tube of the present invention, compared with existing PHC pile tube, with the addition of S95 ore deposit in terms of composition
Powder, super finely ground slag and exciting agent.The environment resistant erosiveness of the PHC pile tube of the present invention is higher, freeze-thaw cycle under fresh water environment
Not destroying for several more than 350 times, under brine media, freeze-thaw resistance is more than F300.Within 30 days, chloride diffusion coefficient is less than 1.02 × 10- 12m2/ s, wherein in the NaCl solution of mass fraction 5%, 3 months chloride permeability degree of depth are less than 25mm, mass fraction 10%
Na2SO4In solution, the relative expansion in 180 days of natural immersion test specimen is less than 0.2%.
(2) intensity is good.The PHC pile tube manufacturing process of the present invention, compared with original preparation method, uses atmospheric steam to support
Protecting and be combined maintenance method with natural water seasoning or water sample, the strength character exempting from pressure steaming PHC pile tube produced meets specification
Various requirement.
(3) economy is good.The PHC pile tube manufacturing process of the present invention, compared with original preparation method, eliminates steam pressure and supports
Protect step, investment reduction cost, simplify production process, decrease human resources and consume, save many energy loss simultaneously,
Compared with the PHC pile tube that tradition steam pressure produces, produce one meter of PHC pile tube cost and to lack close to 10.3 yuan.
Detailed description of the invention
Introduce technical scheme in detail below, and in conjunction with the embodiments, what the present invention was had technology effect is described
Really.
A kind of concrete preparing PHC piles of the present invention, every cube of concrete is by following components
Composition:
In above-mentioned concrete, super finely ground slag refers to that specific surface area is more than or equal to 800m2/ kg, and the ore deposit of particle diameter≤4 μm
Powder.The specific surface area of S95 breeze is 400 500m2/kg.Existing breeze can be divided into two kinds of levels of S95 and S105 by activity index
Not.Select S95 breeze good economy performance.Super finely ground slag is selected and is mainly coordinated portland cement and S95 breeze to use, and makes powder shape
Become tightly packed.
In above-mentioned concrete, the modulus of fineness of sand is 2.4, and clay content is less than 0.8%.Exciting agent is inorganic salts.As
Preferably, exciting agent is CaCl2, or Na2SO4.The exciting agent of existing mineral admixture breeze, flyash etc. has strong acid, alkali, nothing
Machine salt.Acid, alkali are effective but use complexity as exciting agent, and expensive.Inorganic salt can directly make with breeze mixing incorporation
With, technique is the most workable, and raw material is easy to get.The solid content of water reducer is 20%-30%, and water-reducing rate is more than or equal to
The early strength and high effect water reduction agent of 25%.PHC tubular pile concrete ratio of mud ratio is relatively low, and generally below 0.3, add the efficient of high water reducing rate
Water reducer, in the case of concrete can ensure workability, promotes the intensity of PHC tubular pile concrete.
In above-mentioned concrete, when only mixing S95 breeze, mineral admixture is S95 breeze.S95 ore deposit is mixed when simultaneously
When powder and super finely ground slag, mineral admixture is the mixture of S95 breeze and super finely ground slag.S95 breeze mixes with super finely ground slag to be mixed
Fashionable, S95 breeze is 3-5:1 with the mass ratio of super finely ground slag.Binder Materials is portland cement, S95 breeze and super finely ground slag
Mixture.Mineral admixture accounts for the 5%-20% of Binder Materials gross mass.Portland cement is class 5 2.5I or 52.5 II type silicon
Acid salt cement.
The preparation method of above-mentioned PHC piles, including procedure below:
The first step: prepare concrete: sand, portland cement, super finely ground slag, exciting agent and S95 breeze are added blender
Middle stirring, after mixing time 0.5 1 minutes, adds rubble stirring, adds water, form mixing during stirring rubble
Thing, adds water reducer and water, is stirred 23 minutes, forms concrete.
Second step: prepare PHC piles: the concrete first step made is put in mould, carry out
Cloth stretch-draw, Shi Hanzhang, then by concrete tubular pile centrifuge to concrete centrifugal molding, obtain prestressed high strength
Concrete tubular pile.
In second step, exempting from pressure and steam in PHC tubular pile concrete forming process, working performance of concrete is had the biggest by ambient temperature
Impact, ambient temperature is the lowest, and identical match ratio concrete flowability diminishes, and the slump reduces, and needs suitably regulation water reducer to use
Amount.
3rd step: carry out maintenance for the first time: use atmospheric steam curing, the prestressed high strength coagulation prepared by second step
Soil pile tube is placed in steam-cured pond, quiet stop 1-2 hour after, be warmed up to 75 80 DEG C with 25 DEG C/h, constant temperature 68 hours, then 1
Room temperature is cooled in hour.
In 3rd step, atmospheric steam curing includes quiet stopping, heats up, constant temperature and cooling four-stage, and major parameter has quiet stopping
Time, heating-up time, constant temperature time, thermostat temperature and temperature fall time, the change of these parameters is to mechanical performance of concrete and resistance to
Property has a significant impact for a long time.
4th step: by PHC piles form removal；
5th step: carry out second time maintenance: naturally watered by the PHC piles after the 4th step form removal
Water curing or water are supported.The curing time of maintenance for the second time is 3 10 days.
In 5th step, ambient temperature is the highest, and required curing time is the shortest.Water curing PHC pile tube with naturally water
Maintenance PHC pile tube, intensity aspect remains basically stable, but in terms of durability and toughness, water curing is better than nature water seasoning.
In the concrete of the present invention, S95 breeze and super finely ground slag are under exciting agent effect, with silicate cement hydration product
Ca(OH)2Reaction, fill concrete hole further, improves pore structure, reduces porosity, thus reaches the work of resistance to environmental attack
With.Meanwhile, portland cement, S95 breeze and three kinds of materials of super finely ground slag are used together, and are formed between solid particle tightly packed,
Reducing porosity, durability is promoted accordingly.The PHC pile tube of present invention intensity after second time maintenance reach 83MPa with
On, portland cement is fast hydration when atmospheric steam curing, and hydrated product and the aggregate such as rubble, sand are combined closely to harden and improved
Pile tube intensity.
In the preparation method of the present invention, use two sections of maintenance sides that atmospheric steam curing and natural water seasoning or water are supported
Formula, eliminate tradition PHC pile tube produce in use steam press maintenance mode, reduce fire coal consume, decrease production cost and
Simplify production stage, improve PHC pile tube performance, the most resistance to environmental attack ability simultaneously.The pile tube preparation method of the present invention
In, mineral admixture is S95 breeze and super finely ground slag；Exciting agent is inorganic salts；Water reducer is that polycarboxylic acid early-strength is efficient
Water reducer, dispensing stirring prepares concrete, and after moulding, prestressed stretch-draw, centrifugal forming and maintenance, 3 days mean compressive strengths can
Reaching more than 83MPa, maximum intensity can reach 95MPa.
Enumerate specific embodiment below.The pile tube preparing each embodiment carries out Mechanics Performance Testing and resistance to environmental attack
Performance test.Mechanics Performance Testing includes comprcssive strength and tensile splitting strength test, and test method is with reference to JTJ270-1998
" marine traffic engineering concrete test code ".The test of resistance to environmental attack performance includes the test of resistance to chloride erosion, resistance to sulfate attack
Property test and freeze-thaw resistance test.
The test of resistance to chloride erosion includes being numbered GB/T50082-2009 " normal concrete long-term behaviour and resistance to according to state
For a long time method for testing performance " the quick chloride diffusion coefficient test that carries out, and according to what generation admire in " Dalian University of Technology's structure
Engineering " on deliver the method disclosed in thesis for the doctorate " armored concrete endurance quality experimental study under chloride environment " and carry out
Naturally osmotic is tested.The naturally osmotic test simulation actual Service Environment of PHC pile tube.
Resistance to sulfate aggressivity tests natural immersion under the metabisulfite solution and light water using mass fraction to be 10%, examination
Part expands and surface damage results is as resistance to sulfate aggressivity height judgment basis.Under light water, whether natural immersion is as
Producing the contrast of delayed ettringite formation, PHC pile tube steam curing under constant-pressure and high-temperature (75-80 DEG C), entringite decomposes water
Change in product, in Service Environment, when external environmental condition is suitable, again reacting generation entringite, during mention increasing rapidly
Add, whole PHC pile tube stability is had considerable influence.
Freeze-thaw resistance test uses freshwater soaking and sea water immersion two ways.Freeze-thaw resistance testing experiment method is with reference to state
It is numbered " the Standard for test methods of longterm performance and durability of ordinary concrete standard " of GB/T50082-2009.Freeze-thaw resistance is tested
Evaluation methodology mainly has three: 1) appearance change, freezing-thawing cycles increases certain infringement to surface topography；2) quality
Loss rate, test specimen mass loss rate under certain freezing-thawing cycles is qualified less than 5%；3) relative dynamic elastic modulus retention, reaches
Evil spirit of moving under certain cycle-index amount is by for original more than 60%.
Embodiment 1
A) raw material selects standby: portland cement cement selection 52.5 II type portland cement.S95 breeze is that Nanjing prunus mume (sieb.) sieb.et zucc. treasured produces
S95 breeze.Sand be modulus of fineness be the fluvial sand of 2.4, and clay content is 0.6%.It is broken that rubble is that the continuous skill of 5-25mm joins basalt
Stone, clay content is less than 0.3%.Water reducer selects polycarboxylic acid early-strength high efficiency water reducing agent.Exciting agent is CaCl2.Water is the most certainly
Water.
In the concrete of one cube of the present embodiment, the quality of each component is as shown in table 1.
Table 1(unit: kg)
B) PHC piles is prepared:
The first step: prepare concrete: sand, portland cement and S95 breeze are added in blender and stir, when stirring
Between after 1 minute, add rubble stirring, stirring rubble during add 3/4ths water, formed mixture, add diminishing
Agent and remaining water, be stirred 2 minutes, forms concrete.
Second step: prepare PHC piles: the concrete first step made is put in mould, carry out
Cloth stretch-draw, Shi Hanzhang, then by concrete tubular pile centrifuge to concrete centrifugal molding, obtain prestressed high strength
Concrete tubular pile.
3rd step: carry out maintenance for the first time: use atmospheric steam curing, the prestressed high strength coagulation prepared by second step
Soil pile tube be placed in steam-cured pond, quiet stop 2 hours after, be warmed up to 80 DEG C with 25 DEG C/h, constant temperature 8 hours, then in 1 hour drop
Temperature is to room temperature；
4th step: by PHC piles form removal；
5th step: carry out second time maintenance: naturally watered by the PHC piles after the 4th step form removal
Water curing or water are supported.
C) pile tube to embodiment 1 preparation carries out Mechanics Performance Testing and the test of resistance to environmental attack performance.
(1) mechanical property of embodiment 1 pile tube:
The comprcssive strength of embodiment 1 pile tube is as shown in table 2.
Table 2
3 days intensity of embodiment 1 pile tube is more than 80MPa as can be seen from Table 2, reaches the PHC pipe that GB13476-2009 specifies
Stake is dispatched from the factory requirement of strength.Tensile splitting strength is more than 4.5MPa, averagely reaches 4.61MPa.
(2) endurance quality of embodiment 1 pile tube:
Resistance to chloride erosion is tested: 7 days chloride diffusion coefficients of embodiment 1 pile tube are 3.1 × 10-10m2/ s, 30 days chlorine from
Sub-diffusion coefficient is 9.4 × 10-13m2/s.Villaumite soak under under (mass fraction is 5%NaCl solution) pile tube different depth chlorine from
Sub-content is shown in Table 3.As can be seen from Table 3: under soaking at 90 days, the internal 40mm chloride ion of test block accounts for weight concrete only
0.003%。
Table 3
Resistance to sulfate aggressivity test: concrete tubular pile test specimen in the metabisulfite solution that mass fraction is 10% 180 days swollen
Swollen it is less than 0.2%, fresh water expands less than 0.1%.
Freezing and thawing performance is tested: the pile tube of embodiment 1 is freeze-thaw cycle 350 times in fresh water medium, and mass loss rate exists
Within 0.5%, dynamic modulus of elasticity is original about 70%, and freeze proof grade has reached more than F350.Same proportioning concrete tubular pile
Freeze-thaw cycle 300 times in Seawater, mass loss rate is below 1%, and dynamic modulus of elasticity is more than original 70%.
Embodiment 2
A) raw material selects standby: the choosing of the present embodiment raw material is standby same as in Example 1, except for the difference that, adds in the present embodiment
Super finely ground slag, and the specific surface area of super finely ground slag is 700m2/ kg, and the breeze that particle diameter is 3 μm；Exciting agent is Na2SO4。
The match ratio of the PHC tubular pile concrete of the present embodiment is as shown in table 4.
Table 4
B) PHC piles is prepared:
The first step: prepare concrete: sand, portland cement, super finely ground slag and S95 breeze are added in blender and stir,
After mixing time 0.5 minute, add rubble stirring, during stirring rubble, add the water of 3/4ths, form mixing
Thing, adds water reducer and remaining water, is stirred 3 minutes, forms concrete.
Second step: prepare PHC piles: the concrete first step made is put in mould, carry out
Cloth stretch-draw, Shi Hanzhang, then by concrete tubular pile centrifuge to concrete centrifugal molding, obtain prestressed high strength
Concrete tubular pile.
3rd step: carry out maintenance for the first time: use atmospheric steam curing, the prestressed high strength coagulation prepared by second step
Soil pile tube be placed in steam-cured pond, quiet stop 1 hour after, be warmed up to 75 DEG C with 25 DEG C/h, constant temperature 6 hours, then in 1 hour drop
Temperature is to room temperature；
4th step: by PHC piles form removal；
5th step: carry out second time maintenance: naturally watered by the PHC piles after the 4th step form removal
Water curing or water are supported.
The pile tube of embodiment 2 preparation is carried out Mechanics Performance Testing and the test of resistance to environmental attack performance.Test result is as follows:
(1) mechanical property of embodiment 2 pile tube:
The intensity test result of embodiment 2 pile tube is as shown in table 5.
Table 5
As can be seen from Table 5: 3 days intensity of embodiment 2 pile tube is more than 85MPa, and mean intensity reaches 86.2MPa, 7 days intensity
More than 90MPa, reach far away the PHC pile tube that GB13476-2009 specifies and dispatch from the factory requirement of strength.Tensile splitting strength 4.6MPa with
On, averagely reach 4.73MPa.
(2) endurance quality of embodiment 2 pile tube:
Resistance to chloride erosion is tested: 7 days chloride diffusion coefficients of the PHC tubular pile concrete of embodiment 2 are 1.08 × 10- 10m2/ s, within 30 days, chloride diffusion coefficient is 0.76 × 10-12m2/s.Under villaumite immersion, (mass fraction is
The NaCl solution of 5%) chloride ion content titration results is as shown in table 6 under concrete different depth.Can from table 6
Go out: within 90 days, soak at the lower internal 40mm of test block still without chloride ion occurs.
Table 6
Sulphate-corrosion resistance is tested, and concrete sample expands little in 180 days in the metabisulfite solution that mass fraction is 10%
In 0.15%, fresh water expands less than 0.08%.
Freezing and thawing performance is tested: freeze-thaw cycle 500 times in fresh water medium of the PHC tubular pile concrete of embodiment 2, and quality is damaged
Mistake rate is within 0.5%, and relative dynamic elastic modulus is original more than 75%, and freeze proof grade has reached more than F500.Join equally
Freeze-thaw cycle 350 times in Seawater of the PHC tubular pile concrete of ratio, mass loss rate below 1%, relative dynamic elastic modulus
More than original 70%.
Embodiment 3
A) raw material selects standby: the raw material of embodiment 2 is same as in Example 1, except that: sand is that modulus of fineness is
The fluvial sand of 2.4, and clay content is 0.3%.
In the concrete of one cube of the present embodiment, the quality of each component is as shown in table 7.
Table 7
B) PHC piles is prepared:
The first step: prepare concrete: sand, portland cement and S95 breeze are added in blender and stir, when stirring
Between after 0.8 minute, add rubble stirring, stirring rubble during add 3/4ths water, formed mixture, add and subtract
Water preparation and remaining water, be stirred 2.6 minutes, forms concrete.
Second step: prepare PHC piles: the concrete first step made is put in mould, carry out
Cloth stretch-draw, Shi Hanzhang, then by concrete tubular pile centrifuge to concrete centrifugal molding, obtain prestressed high strength
Concrete tubular pile.
3rd step: carry out maintenance for the first time: use atmospheric steam curing, the prestressed high strength coagulation prepared by second step
Soil pile tube be placed in steam-cured pond, quiet stop 1.5 hours after, be warmed up to 78 DEG C with 25 DEG C/h, constant temperature 7 hours, then in 1 hour
Cool to room temperature；
4th step: by PHC piles form removal；
5th step: carry out second time maintenance: naturally watered by the PHC piles after the 4th step form removal
Water curing or water are supported.
C) pile tube to embodiment 1 preparation carries out Mechanics Performance Testing and the test of resistance to environmental attack performance.
(1) mechanical property of embodiment 3 pile tube:
The intensity test result of embodiment 3 pile tube is as shown in table 8.
Table 8
3 days intensity of embodiment 3 pile tube is more than 80MPa as can be seen from Table 8, reaches the PHC pipe that GB13476-2009 specifies
Stake is dispatched from the factory requirement of strength.Tensile splitting strength is more than 4.71MPa, averagely reaches 4.76MPa.
(2) endurance quality of embodiment 3 pile tube:
Resistance to chloride erosion is tested: 7 days chloride diffusion coefficients of the PHC tubular pile concrete of embodiment 3 are 2.12 × 10- 10m2/ s, within 30 days, chloride diffusion coefficient is 1.56 × 10-12m2/s.Under villaumite immersion, (mass fraction is
The NaCl solution of 5%) chloride ion content titration results is as shown in table 9 under concrete different depth.From table 9 permissible
Finding out: under soaking at 90 days, the internal 40mm chloride ion of test block accounts for weight concrete and is only 0.006%.
Table 9
Resistance to sulfate aggressivity test: concrete tubular pile test specimen in the metabisulfite solution that mass fraction is 10% 180 days swollen
Swollen it is less than 0.13%, fresh water expands less than 0.07%.
Freezing and thawing performance is tested: the pile tube of embodiment 3 is freeze-thaw cycle 350 times in fresh water medium, and mass loss rate exists
Within 0.5%, dynamic modulus of elasticity is original 90%, and freeze proof grade has reached more than F350.Same proportioning concrete tubular pile is in sea
Freeze-thaw cycle 300 times in aqueous medium, mass loss rate is below 0.9%, and dynamic modulus of elasticity is more than original 75%.
Comparative example
A) raw material selects standby: the choosing of this comparative example raw material is standby same as in Example 1, and except for the difference that, cement is P II 42.R water
Mud, water reducer is naphthalene series high-efficiency water-reducing agent, without S95 breeze and exciting agent.
In the concrete of one cube of comparative example, the quality of each component is as shown in table 10.
Table 10
| Numbering | Cement | Sand | Rubble | Water | Water reducer |
| Comparative example | 460 | 740 | 1210 | 119.6 | 4.14 |
B) manufacturing process of comparative example is as follows:
The first step: prepare concrete: sand, cement are added stirring in blender, after mixing time 0.5 minute, adds
Enter rubble stirring, during stirring rubble, add the water of 3/4ths, form mixture, add water reducer and remaining
Water, is stirred 3 minutes, forms concrete.
Second step: prepare PHC piles: the concrete first step made is put in mould, carry out
Cloth stretch-draw, Shi Hanzhang, then by concrete tubular pile centrifuge to concrete centrifugal molding, obtain prestressed high strength
Concrete tubular pile.
3rd step: carry out maintenance for the first time: use atmospheric steam curing, the prestressed high strength coagulation prepared by second step
Soil pile tube be placed in steam-cured pond, quiet stop 1 hour after, be warmed up to 80 DEG C with 25 DEG C/h, constant temperature 6 hours, then in 1 hour drop
Temperature is to room temperature；
4th step: by PHC piles form removal；
5th step: carry out second time maintenance: the PHC piles after the 4th step form removal is put into steam pressure
Maintenance 4 hours in still.
The pile tube preparing comparative example carries out Mechanics Performance Testing and the test of resistance to environmental attack performance.Test result is as follows:
(1) mechanical property of comparative example pile tube:
The intensity test result of comparative example pile tube is as shown in table 11.
Table 11
3 days intensity of embodiment 1 pile tube is more than 80MPa as can be seen from Table 2, reaches the PHC pipe that GB13476-2009 specifies
Stake is dispatched from the factory requirement of strength.
(2) endurance quality of comparative example pile tube:
7 days chloride diffusion coefficients of comparative example tubular pile concrete are 6.34 × 10-10m2/ s, 30 days chloride diffusion coefficients
It is 5.56 × 10-11m2/s.Chloride ion content under (mass fraction is the NaCl solution of 5%) concrete different depth under villaumite immersion
Titration results is as shown in table 12.
Table 12
Sulphate-corrosion resistance is tested, and comparative example tubular pile concrete test specimen is in the metabisulfite solution that mass fraction is 10%
Within 180 days, expand close to 0.3%, fresh water expands close to 0.15%.
Freezing and thawing performance is tested: comparative example tubular pile concrete is freeze-thaw cycle 150 times in fresh water medium, and mass loss rate exists
Within 5%, but relative dynamic elastic modulus reduces to original more than 65%, and freeze proof grade has reached below F150.In Seawater
Freeze-thaw cycle 50 times, mass loss rate is more than 5%, and relative dynamic elastic modulus is less than original 70%.
By comparing three embodiments and the comparative example test result in endurance quality: the freeze thawing resistance of three embodiments
Property fresh water medium be issued to more than F350, in Seawater freeze-thaw cycle arrive do not destroy for 300 times.Comparative example pile tube freeze-thaw resistance
Being inferior to embodiment, fresh water and Seawater lower surface and degrade seriously, freeze thawing resistance cycle-index is few.
In sum, what the embodiment of the present invention used exempts from pressure steaming PHC tubular pile concrete, uses with comparative example in mechanical property
The concrete of steam press maintenance all reach C80 rank.What the embodiment of the present invention produced exempts to press steaming PHC pile tube to meet product specification
Requirement.But in terms of environment resistant aggressivity, pressure that what the embodiment of the present invention used exempt from steams pile tube that PHC pile tube prepared than comparative example more
Good, particularly in terms of anti-freezing property.The concrete sample freeze-thaw resistance of embodiment 2 is more than F350, and the pressure of comparative example is steamed
Rear PHC tubular pile concrete test specimen freeze-thaw resistance is less than F250.Meanwhile, the preparation process of the present invention is similarly obtained simplification, and manpower provides
Source consumes reduces, and saves the much energy, and economic benefit is improved substantially.
Claims (7)
1. the concrete preparing PHC piles, it is characterised in that in this concrete, every cube of coagulation
Soil is composed of the following components:
Portland cement: 360-500kg；
S95 breeze: 50-150kg；
Super finely ground slag: 10-50kg；
Sand: 700-750kg；
Rubble: 1150-1250kg；
Water: 115-151kg；
Water reducer: 3.68-5.4kg；
Exciting agent: 9.2-10.8kg；
Described super finely ground slag refers to that specific surface area is more than or equal to 800m2/ kg, and the breeze of particle diameter≤4 μm；The ratio of S95 breeze
Surface area is 400 500m2/kg；
Described S95 breeze is 3-5:1 with the mass ratio of super finely ground slag.
2. according to the concrete preparing PHC piles described in claim 1, it is characterised in that described
The modulus of fineness of sand is 2.4, and clay content is less than 0.8%.
3. according to the concrete preparing PHC piles described in claim 1, it is characterised in that described
Exciting agent is inorganic salts.
4. according to the concrete preparing PHC piles described in claim 3, it is characterised in that described
Exciting agent is CaCl2, or Na2SO4。
5. according to the concrete preparing PHC piles described in claim 1, it is characterised in that described
The solid content of water reducer is 20%-30%, and water-reducing rate is more than or equal to 25%.
6. utilizing the concrete described in claim 1 to prepare a preparation method for PHC piles, it is special
Levying and be, this preparation method includes procedure below:
The first step: prepare concrete: sand, portland cement, super finely ground slag, exciting agent and S95 breeze are added in blender and stir
Mix, after mixing time 0.5-1 minute, add rubble stirring, during stirring rubble, add water, form mixture, then
Add water reducer and water, be stirred 2-3 minute, form concrete；
In this concrete, every cube of concrete is composed of the following components:
Portland cement: 360-500kg；
S95 breeze: 50-150kg；
Super finely ground slag: 10-50kg；
Sand: 700-750kg；
Rubble: 1150-1250kg；
Water: 115-151kg；
Water reducer: 3.68-5.4kg；
Exciting agent: 9.2-10.8kg；
Described super finely ground slag refers to that specific surface area is more than or equal to 800m2/ kg, and the breeze of particle diameter≤4 μm；The ratio of S95 breeze
Surface area is 400 500m2/kg；
Described S95 breeze is 3-5:1 with the mass ratio of super finely ground slag；
Second step: prepare PHC piles: the concrete first step made is put in mould, carry out cloth
Stretch-draw, Shi Hanzhang, then by concrete tubular pile centrifuge to concrete centrifugal molding, obtain prestressed high strength coagulation
Soil pile tube；
3rd step: carry out maintenance for the first time: use atmospheric steam curing, the prestressed high strength concrete pipe prepared by second step
Stake be placed in steam-cured pond, quiet stop 1-2 hour after, be warmed up to 75 80 DEG C with 25 DEG C/h, constant temperature 68 hours, then 1 hour
Inside cool to room temperature；
4th step: by PHC piles form removal；
5th step: carry out second time maintenance: naturally water foster by the PHC piles after the 4th step form removal
Protect or water is supported.
7. according to the preparation method of the PHC piles described in claim 6, it is characterised in that described
In five steps, the curing time of maintenance for the second time is 3 10 days.
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| CN104211353A (en) * | 2014-08-29 | 2014-12-17 | 江苏奥莱特新材料有限公司 | Concrete for non-autoclaved PHC tubular pile |
| CN104386965A (en) * | 2014-11-03 | 2015-03-04 | 连云港艾可新型建材有限公司 | Sulfate-resistant and corrosion-resistant impervious non-autoclaved C80P12 concrete pipe pile |
| CN106673551A (en) * | 2016-12-23 | 2017-05-17 | 宁波金美亚池州管桩有限公司 | Concrete pipe pile and preparation method thereof |
| 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 |
| CN113334565A (en) * | 2021-05-08 | 2021-09-03 | 广东三和管桩股份有限公司 | Preparation method of diamond pile |
| CN117069424B (en) * | 2023-07-03 | 2024-06-11 | 广东粤海珠三角供水有限公司 | Prestressed lining concrete and preparation method and construction method thereof |
| CN117142827B (en) * | 2023-10-31 | 2024-02-23 | 北京慕湖外加剂有限公司 | Corrosion-resistant concrete and high-corrosion-resistance prestressed concrete pipe pile and application |
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| JPH04193751A (en) * | 1990-11-27 | 1992-07-13 | Hitachi Cement Kk | High-strength concrete formed article |
| JP2000211956A (en) * | 1999-01-25 | 2000-08-02 | Mitsubishi Materials Corp | Cement composition |
| JP4593412B2 (en) * | 2005-09-14 | 2010-12-08 | 電気化学工業株式会社 | Centrifugal concrete product and manufacturing method thereof |
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