CN107487998A - Prestressed high-strength concrete pile additive - Google Patents
Prestressed high-strength concrete pile additive Download PDFInfo
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- CN107487998A CN107487998A CN201710714566.4A CN201710714566A CN107487998A CN 107487998 A CN107487998 A CN 107487998A CN 201710714566 A CN201710714566 A CN 201710714566A CN 107487998 A CN107487998 A CN 107487998A
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- Prior art keywords
- additive
- pile tube
- concrete pile
- strength concrete
- strength
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
-
- 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
- E02D5/58—Prestressed concrete piles
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Paleontology (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a kind of prestressed high-strength concrete pile additive, belongs to building material field, and the additive is the mixture of microcrystalline white mica powder and polycarboxylate, preferably also contains oyster shell powder；Add the additive of the present invention, it is equipped with appropriate admixture and preparation technology, the compression strength of gained finished product pile tube reaches more than 95MPa, compression strength homogeneity is significantly improved, the standard deviation of compression strength can be reduced to below 2MPa, accordingly, anti-freezing property, anti-bending strength and cracking resistance are also significantly improved.
Description
Technical field
The present invention relates to building material field, more particularly to a kind of prestressed high-strength concrete pile additive.
Background technology
Prestressed high-strength concrete pile, i.e. PHC stakes, also known as pretensioned-prestressed tube pile, in advance should using pre-tensioning system
A kind of hollow cylinder elongate concrete prefabricated components made of power technique and centrifugal casting, GB13476-2009 regulations PHC's
Strength grade of concrete is not less than C80, i.e. compression strength should be more than 80MPa, and in actual applications, if to adapt to complexity
Landform just must be in more than C90.
Due to be centrifuging process shaping, aggregate skewness, coarse aggregate more integrated distribution in tube wall
Outside, inner side coarse aggregate is less, so as to cause following shortcoming：First, the uniform intensity of pile tube is poor, using current coagulation
Native test block experiment, in the radial and axial sampling of pile tube, sample size more than 20, the standard deviation of intensity is generally higher than
10Mpa；Two be due to shaping pile tube material it is uneven, concrete density is uneven, so as to cause the durability of pile tube compared with
Difference, its resistance of chloride ion penetration are poor.
At present, in order to solve these problems, general to be solved using the method for adding additive, the additive of addition is general
It is naphthalene water reducer, or polycarboxylic acid salt's water reducer；Such as publication number CN 101962280A Chinese patent application, add
High-efficiency water-reducing agent of poly-carboxylic acid is entered, its intensity reaches more than 95Mpa, and frost resistance reaches more than F700, but the standard of its intensity
Deviation reaches 10.26MPa；The such as A of Publication No. CN 103641397 Chinese patent application again, adds lignosulfonates
And polycarboxylate, the freeze proof grade of last pile tube is F400, and the standard deviation of its intensity is even more to reach 15.03MPa.
In addition, current research shows, autoclave curing can also reduce the durability of pile tube, so being related to exempt from present
The research of steam pressure prestressed concrete pipe pile, such as Publication No. CN105130308A, it uses atmospheric steam curing, during demoulding
Intensity reaches 85MPa up to 80MPa, natural curing after 1-3 days, still, the standard deviation of the intensity of this pile tube also reaches
More than 10Mpa, its durability is also poor, and its frost resistance only has F500 or so, and this is for north cold area and southeastern coast
Area, its useful life longevity is with regard to poor.
That is, current prestressed high-strength concrete pile, due to existing strength test method, generally
It is larger to there is compressive strength standard deviation, anti-bending strength and cracking resistance there is also it is similar the problem of, so as to cause intensity and tough
Property " is captured " from weaker so that durability is poor.
A kind of intensity height is badly in need of in this area, and uniform intensity is good, the prestressed concrete with excellent durability energy
Native pile tube.
The content of the invention
The purpose of the present invention, which is that, provides a kind of prestressed high-strength concrete pile additive, to solve the above problems.
To achieve these goals, the technical solution adopted by the present invention is such：
A kind of prestressed high-strength concrete pile additive, the additive are the mixing of microcrystalline white mica powder and polycarboxylate
Thing.
As preferable technical scheme：The mass ratio of microcrystalline white mica powder and polycarboxylate is in the additive（2-3）：
（0.5-1.0）.
As preferable technical scheme：The particle diameter of microcrystalline white mica powder is 3000-5000 mesh in the additive.
The microcrystalline white mica powder of appropriate particle size, it is more beneficial for playing the collective effect with other compositions, improves the equal of material
One property and the intensity of finished product, freeze proof cracking resistance.
As preferable technical scheme：Also contain oyster shell powder in the additive.
As further preferred technical scheme：The particle diameter of the oyster shell powder is the mesh of 500 mesh -1000.
As further preferred technical scheme：In the additive, microcrystalline white mica powder, polycarboxylate and oyster shell powder
Mass ratio be（1-1.5）：（0.5-1.0）：（1-1.5）.
The additive of the present invention, add in concrete：
The concrete include following weight than component composition：
Portland cement 10%-15%
Aggregate 45%-65%
Admixture 10%-15%
Additive 1-2%
Surplus is water；
Wherein, the aggregate is river sand and cobblestone；The admixture is flyash, slag micropowder, land plaster and silica flour
Mixture；
The preparation method for adding the prestressed high-strength concrete pile of additive of the present invention is to comprise the following steps：
（1）Each component is weighed according to described mass ratio, additive first is added into water with admixture stirs, at least 30min
Afterwards, portland cement and aggregate are added, is stirred, obtains material；
（2）By step（1）The material feeding mould of gained, then tensioning；
（3）Centrifugal forming：Rotary process is three phases:Pipe die speed is respectively 60-80 revs/min of low speed, 2-3 minutes；
200-260 revs/min of middling speed, 2.0-3.5 minutes；400-430 revs/min of high speed, 5-6 minutes, obtain semi-finished product；
（4）Normal pressure is steam-cured：By step（3）It is 0.5- that gained semi-finished product are quickly ramped up to 95-100 DEG C of heating-up time by room temperature
1.5h, 95-100 DEG C of 5-6h is kept, then natural cooling；
（5）Maintenance：The demoulding, natural curing 3-5 days, is produced.
Present inventor, by many experiments, special formula is employed, especially special additive, this is outer
Add agent and other components, especially admixture together, interact, and be aided with special preparation technology, can make material from
During the heart, keep as far as possible uniform so that the material of various particle diameters is as few as possible to be acted on by centrifugal force, existing so as to solve
The problem of some prestressed concrete pipe pile " more integrated distribution are less in the outside of tube wall, inner side coarse aggregate for coarse aggregate "；
Concrete density is significantly increased, and the probability of generation alkali-aggregate reaction is almost nil during use, and cracking pressure improves, and opens
Split temperature reduction；So that the intensity increase of finished product pile tube, uniform intensity are significantly improved, the standard deviation of compression strength
Difference can be reduced to below 2MPa, and accordingly, anti-freezing property, anti-bending strength and cracking resistance are also significantly improved.
In addition, using the component and preparation method of the present invention, atmospheric steam curing can be used, so as to avoid high-pressure curing
The problem of being brought to intensity, cracking resistance etc., further increase its durability.
Microcrystal muscovite of the present invention, is a kind of new nonmetallic mineral resource, and main mineral constituent is big 2M1
Type muscovite, submember is a small amount of quartz, micro chlorite and trace potassium feldspar, by the prosperous torch mining industry in Sichuan in 1997
Find first at home.It is noteworthy characterized by：Genetic type is new, crystallizable mineral fine size, and ore muscovite content is high, quality
Good, deposit scale is big.Current microcrystal muscovite ore deposit has carried out scale mining and powder processing, microcrystalline white mica powder product
Insulating（Insulating pouring sealant）, paint（Anticorrosive paint）, plastics, rubber（PVC material）, the field extensive use such as ceramics,
To substitute traditional sericite mineral material.But the report of application is had no in concrete；
The polycarboxylate of the present invention, it is preferred to use modified polycarboxylic acid salt XT-2000, it is that acrylic acid-acrylic ester-sulfonate is common
Polymers, it is a kind of high-effect dirt dispersion agent, is usually used in water process, in the market can be directly commercially available.
As preferable technical scheme：The mass ratio of river sand and cobblestone is 1 in the aggregate：（1-2）.
As further preferred technical scheme：In the cobblestone, particle diameter 0.2-1.0cm, 1.0-1.5cm and 1.5-
2.5cm mass ratio is respectively 1:（1-2）:（2-3）.
Suitable river sand and the ratio of cobblestone, suitable different size of cobblestone proportioning is equipped with, can aid in centrifuging
When material it is as far as possible uniform, reduce centrifugal force for different-grain diameter distribution influence.
As preferable technical scheme：Flyash in the admixture, slag micropowder, the mass ratio of land plaster and silica flour
For（1-2）：（1-2）：（0.5-1.0）：（1.5-2.0）.
Compared with prior art, the advantage of the invention is that：The present invention employs due to adding special additive
Special preparation technology, material can be made in centrifugal process, as keep uniform as possible so that the material of various particle diameters is as far as possible
Few to be acted on by centrifugal force, the compression strength of gained finished product pile tube reaches more than 95MPa, and compression strength homogeneity is significantly carried
Rising, the standard deviation of compression strength can be reduced to below 2MPa, accordingly, anti-freezing property, anti-bending strength and cracking resistance
It is significantly improved, frost resistance reaches more than F795；Finally cause PHC piles in north cold area
And southeastern coast environment expected service life was up to more than 50 years.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
Embodiment 1：
A kind of prestressed high-strength concrete pile, including concrete and reinforcing bar, the concrete include following weight than component
Composition：
Portland cement 120kg
Aggregate 550kg
Admixture 100kg
Additive 12kg
Suitable quantity of water；
Wherein, the aggregate is river sand and cobblestone, and the mass ratio of river sand and cobblestone is 1 in the aggregate：1.5, the goose
In cobble, particle diameter 0.2-1.0cm, 1.0-1.5cm and 1.5-2.5cm mass ratio are respectively 1:,1.5:2.5；
The admixture is the mixture of flyash, slag micropowder, land plaster and silica flour, flyash, ore deposit in the admixture
The mass ratio of slag micro mist, land plaster and silica flour is 1：1：0.5：1.5；
The additive is the mixture of microcrystalline white mica powder and polycarboxylate, microcrystalline white mica powder and poly- carboxylic in the additive
The mass ratio of hydrochlorate is 2：0.5, the particle diameter of microcrystalline white mica powder is 5000 mesh；
Its preparation method is to comprise the following steps：
（1）Each component is weighed according to described mass ratio, additive first is added into water with admixture stirs, after 60min, then
Portland cement and aggregate are added, stirs, obtains material；
（2）By step（1）The material feeding mould of gained, then tensioning；
（3）Centrifugal forming：Rotary process is three phases:Pipe die speed is respectively low speed 65 revs/min, 2 minutes；Middling speed
210 revs/min, 3.5 minutes；430 revs/min at a high speed, 5- minutes, obtain semi-finished product；
（4）Normal pressure is steam-cured：By step（3）It is 0.5h that gained semi-finished product are quickly ramped up to 95-100 DEG C of heating-up time by room temperature, is protected
95-100 DEG C of 6h is held, then natural cooling；
（5）Maintenance：The demoulding, natural curing 5 days, produces, obtains " pile tube A ", internal diameter 600mm, length 10m.
Embodiment 2：
A kind of prestressed high-strength concrete pile, including concrete and reinforcing bar, the concrete include following weight than component
Composition：
Portland cement 120kg
Aggregate 550kg
Admixture 100kg
Additive 12kg
Suitable quantity of water；
Wherein, the aggregate is river sand and cobblestone, and the mass ratio of river sand and cobblestone is 1 in the aggregate：1.5, the goose
In cobble, particle diameter 0.2-1.0cm, 1.0-1.5cm and 1.5-2.5cm mass ratio are respectively 1:,1.5:2.5；
The admixture is the mixture of flyash, slag micropowder, land plaster and silica flour, flyash, ore deposit in the admixture
The mass ratio of slag micro mist, land plaster and silica flour is 1：1：0.5：1.5；
The additive is the mixture of microcrystalline white mica powder, polycarboxylate and oyster shell powder, crystallite white clouds in the additive
Female powder, polycarboxylate, the mass ratio of oyster shell powder are 2：0.5：1, the particle diameter of microcrystalline white mica powder is 5000 mesh, the oyster shell
The particle diameter of powder is 800 mesh；
Its preparation method is to comprise the following steps：
（1）Each component is weighed according to described mass ratio, additive first is added into water with admixture stirs, after 60min, then
Portland cement and aggregate are added, stirs, obtains material；
（2）By step（1）The material feeding mould of gained, then tensioning；
（3）Centrifugal forming：Rotary process is three phases:Pipe die speed is respectively low speed 65 revs/min, 2 minutes；Middling speed
210 revs/min, 3.5 minutes；430 revs/min at a high speed, 5- minutes, obtain semi-finished product；
（4）Normal pressure is steam-cured：By step（3）It is 0.5h that gained semi-finished product are quickly ramped up to 95-100 DEG C of heating-up time by room temperature, is protected
95-100 DEG C of 6h is held, then natural cooling；
（5）Maintenance：The demoulding, natural curing 5 days, produces, obtains " pile tube B ", internal diameter 600mm, length 10m.
Comparative example 1：
In the present embodiment, the microcrystalline white mica powder that is added without in embodiment 1, remaining is same as Example 1, obtains " contrast pile tube
A ", internal diameter 600mm, length 10m.
Comparative example 2
The method recorded using the specification embodiment 2 of the A of Publication No. CN 105130308 Chinese patent application, preparation pair
Than pile tube, " contrast pile tube 2 ", internal diameter 600mm, length 10m are obtained.
Performance test：
1. intensity test：
Method according to GB/T 50081-2016 carry out after demoulding and maintenance 5 days after intensity test, using current mixed
Solidifying native test block experiment, as a result, the intensity after pile tube A, pile tube B, contrast pile tube 1 and the contrast demoulding of pile tube 2 is respectively 85 MPa, 89
MPa, 78 MPa and 80 MPa；Intensity after pile tube A, pile tube B, contrast pile tube 1 and contrast pile tube 2 conserve 5 days is respectively 95
MPa, 97 MPa, 82 MPa and 86 MPa.
2. compression strength homogeneity is tested
Tested using current concrete test block, in the radial and axial sampling of each pile tube, 30 samples of sample size, pile tube
A, pile tube B, contrast pile tube 1 and the contrast compression strength of pile tube 2 standard deviation are respectively 1.96Mpa, 1.52 Mpa, 10.21
Mpa and 11.32MPa, it is seen that in terms of uniform intensity, the present invention achieve less than technique effect.
3. Anti-idiotypic vaccine
According to GB 50164-2011 related request, the anti-freezing property of pile tube is tested, as a result, pile tube A, pile tube B, contrast pile tube 1
It is respectively F795, F812, F635 and F366 with contrast 2 freeze proof grade of pile tube；
Using age 28d test block after the saturation that absorbs water, multigelation circulation is born, is declined with compression strength no more than 25%, and
And mass loss when being no more than 5% the maximum freezing-thawing cycles that can bear the freeze proof grade that determines, pile tube A, pile tube B,
It is respectively D390, D430, D290 and D250 to contrast pile tube 1 and contrast 2 freeze proof grade of pile tube.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
All any modification, equivalent and improvement made within principle etc., should be included in the scope of the protection.
Claims (6)
- A kind of 1. prestressed high-strength concrete pile additive, it is characterised in thatThe additive is the mixture of microcrystalline white mica powder and polycarboxylate.
- 2. prestressed high-strength concrete pile additive according to claim 1, it is characterised in that：It is micro- in the additive The mass ratio of brilliant white mica powder and polycarboxylate is (2-3)：(0.5-1.0).
- 3. prestressed high-strength concrete pile additive according to claim 1, it is characterised in that：It is micro- in the additive The particle diameter of brilliant white mica powder is 3000-5000 mesh.
- 4. prestressed high-strength concrete pile additive according to claim 1, it is characterised in that：In the additive also Contain oyster shell powder.
- 5. prestressed high-strength concrete pile according to claim 4, it is characterised in that：The particle diameter of the oyster shell powder is The mesh of 500 mesh -1000.
- 6. prestressed high-strength concrete pile according to claim 4, it is characterised in that：In the additive, crystallite is white The mass ratio of mica powder, polycarboxylate and oyster shell powder is (1-1.5)：(0.5-1.0)：(1-1.5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710714566.4A CN107487998A (en) | 2017-08-18 | 2017-08-18 | Prestressed high-strength concrete pile additive |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710714566.4A CN107487998A (en) | 2017-08-18 | 2017-08-18 | Prestressed high-strength concrete pile additive |
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| CN107487998A true CN107487998A (en) | 2017-12-19 |
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ID=60645308
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1919924A (en) * | 2005-08-26 | 2007-02-28 | 建筑技术研究有限公司 | Powdery polymer composition based on polyether carboxylate |
| CN101962280A (en) * | 2010-09-20 | 2011-02-02 | 中交第一航务工程局有限公司 | Prestress high-strength concrete tubular pile |
| CN103641397A (en) * | 2013-11-21 | 2014-03-19 | 江苏东浦管桩有限公司 | Prestressed concrete high-strength anticorrosive pipe pile and production method thereof |
| CN105130308A (en) * | 2015-08-31 | 2015-12-09 | 河南双建管桩股份有限公司 | Prestress concrete tubular pile free of steaming and pressing |
| CN105777008A (en) * | 2016-03-15 | 2016-07-20 | 东南大学 | Autoclaving-free prestressed high-strength tube pile concrete and tube pile manufacturing method |
-
2017
- 2017-08-18 CN CN201710714566.4A patent/CN107487998A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1919924A (en) * | 2005-08-26 | 2007-02-28 | 建筑技术研究有限公司 | Powdery polymer composition based on polyether carboxylate |
| CN101962280A (en) * | 2010-09-20 | 2011-02-02 | 中交第一航务工程局有限公司 | Prestress high-strength concrete tubular pile |
| CN103641397A (en) * | 2013-11-21 | 2014-03-19 | 江苏东浦管桩有限公司 | Prestressed concrete high-strength anticorrosive pipe pile and production method thereof |
| CN105130308A (en) * | 2015-08-31 | 2015-12-09 | 河南双建管桩股份有限公司 | Prestress concrete tubular pile free of steaming and pressing |
| CN105777008A (en) * | 2016-03-15 | 2016-07-20 | 东南大学 | Autoclaving-free prestressed high-strength tube pile concrete and tube pile manufacturing method |
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