CN106517856A - WHDF-N type viscosity modifier applicable to self-compacting concrete - Google Patents
WHDF-N type viscosity modifier applicable to self-compacting concrete Download PDFInfo
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- CN106517856A CN106517856A CN201611010459.5A CN201611010459A CN106517856A CN 106517856 A CN106517856 A CN 106517856A CN 201611010459 A CN201611010459 A CN 201611010459A CN 106517856 A CN106517856 A CN 106517856A
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- whdf
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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
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/44—Thickening, gelling or viscosity increasing agents
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a WHDF-N type viscosity modifier applicable to self-compacting concrete. The WHDF-N type viscosity modifier comprises components in percentage by weight as follows: 15%-25% of a crystallization excitation component, 7%-13% of an activity excitation component, 10%-15% of a tricalcium aluminate inhibition component, 6%-14% of a workability regulation component, 2%-6% of an anti-microbe component and 30%-40% of water. Under actions of promoting cement hydration degree, optimizing a hydration product, inhibiting early rapid hydration of tricalcium aluminate, reducing early hydration heat and the like, the WHDF-N type viscosity modifier has the advantages that gel of a system is increased, pores are reduced, an aggregate interface structure and early hydration heat are improved, and the workability and self-compacting performance of a concrete mixture are improved effectively while the crack resistance, impermeability and durability of the concrete are improved remarkably.
Description
Technical field
The invention belongs to self-compacting concrete field, relates particularly to a kind of WHDF-N types viscosity modifier.
Background technology
With the concrete works amounts such as the great development of western part of China, road and bridge, water conservancy project dam, rail facility, building it is fast
Speed increases, and self-compacting concrete will be more widely used.But up to the present, both at home and abroad to self-compacting concrete
It is in terms of research also has focused largely on the investigations of materials such as the preparation of mixture, less to self-compacting concrete mechanical property research,
Not system, existing data are not enough, and discreteness is big.For this purpose, the test for systematically carrying out self-compacting concrete mechanical property is ground
Study carefully and be very important, it will provide foundation to improve Code for design of concrete structures from now on.Self-compacting concrete is referred to certainly
Under body action of gravity, can flow, it is closely knit, even if there is fine and close reinforcing bar can also be filled up completely with template, while obtaining fine homogenizing
Property, and do not need the concrete of extraneous vibration.Its self-compacting ability mainly includes mobility, education resistance and fillibility.
Normal practice is all selection and collocation and the meticulous mix-design by cementing material and coarse-fine aggregate on the market at present, is not had
Have what mobility, education resistance and three big problem of fillibility can be solved by a kind of good additive in the lump.And self-compacting concrete
The yield stress of concrete can be reduced to and be enough to, by because the shear stress that deadweight is produced overcomes, make to mix by the birth of viscosity modifier
Solidifying soil mobility increase, while and with enough plastic viscosities, make aggregate be suspended in cement mortar, occur without isolation and bleeding
Problem, can freely trickle and be sufficient filling with the space in template, form closely knit and uniform jelling structure.
The content of the invention
The technical problem to be solved is that a kind of WHDF-N types viscosity proposed for above-mentioned prior art changes
Property agent, be effectively improved hardening after concrete mechanical property and deformation performance, with good workability and self-compacting ability.
The present invention solves the technical scheme that adopted of above-mentioned technical problem：
Suitable for the WHDF-N type viscosity modifiers of self-compacting concrete, its component is as follows, each component content by weight hundred
Fraction is calculated as：Crystallization excites component 15-25%；Activity excitation component 7-13%；Tricalcium aluminate constituents for suppressing 10-15%；With it is easy
Adjust component 6-14%；Preventing microorganism component 2-6%；Water 30-40%.
Described crystallization excites component for Alumen or sodium hexameta phosphate.
Described activity excitation component is semi-hydrated gypsum or Melanteritum.
Described tricalcium aluminate constituents for suppressing is boric acid or ardealite.
The described and easy component that adjusts is sodium naphthalene sulfonate or sulfamic acid sodium.
Described preventing microorganism component is carbamide or waterglass.
The present invention WHDF-N type viscosity modifiers using volume be：(post-cast strip is the 1%-2% of concrete cement amount
Concrete cement amount 2.5%).
The dominant response mechanism of the present invention and the effect of each ingredient are：Crystallization in powder excite component and water and
Calcium silicates in clinker react, and form modified calcium silicate hydrate (M-C-S-H) and plug-hole deposit；Activity excitation
Component excites active addition (free calcium, SiO in concrete in flyash2And Al2O3Deng) activity, make them
With Ca (OH)2Secondary hydration is carried out, hydrated calcium silicate (C-S-H) and calcium aluminosilicate hydrate mineral (C is generated3AS2Hn)；Tricalcium aluminate
Constituents for suppressing forms a kind of complex at the aquation initial stage with part tricalcium aluminate in concrete, and (this complex is a kind of non-stable
Compound, with Ca (OH) in system2Increase and gradually decompose so that tricalcium aluminate is gradually able to aquation in the aquation later stage),
Optionally inhibit the fast hydration of aquation early stage tricalcium aluminate to react, both ensure that the abundant of dicalcium silicate and tricalcium silicate
Aquation, reduces the heat of hydration and drying shrinkage in earlier systems again；Workability adjusts component on the premise of water consumption is reduced, and improves
The mobility and caking property of concrete, it is ensured that its service behaviour；Preventing microorganism component Main Function is to allow microorganism not colonize in
The surface of concrete and weather.
Above-mentioned effect is to increase the gel (C-S-H and M-C-S-H) in concrete system, density increase, under porosity
The cohesive force and density of drop, Behavior of Hardened Cement Paste and its aggregate interface strengthens, and produces good interfacial effect.Meanwhile, the water of early stage
Change heat and drying shrinkage decline, the service behaviour of concrete also be improved significantly.Therefore, make concrete that there is good self compacting ability
Energy.
The beneficial effects of the present invention is：The WHDF-N types viscosity modifier of the present invention passes through to promote hydrated cementitious degree,
Optimization hydrated product, suppresses tricalcium aluminate early stage fast hydration, reduces the effect such as early hydration heat, and the system gel of making increases, hole
Gap declines, and aggregate interfacial structure and the early stage heat of hydration are improved, significantly improve concrete anticracking, impervious and durability it is same
When, it is effectively improved the workability and self-compacting ability of concrete mix.
Description of the drawings
Fig. 1 is the figure of the cement paste divergence after mixing the WHDF-N type viscosity modifiers prepared by the embodiment of the present invention
Piece；
Fig. 2 is the picture of the cement paste divergence for being not incorporated into WHDF-N type viscosity modifiers；
Fig. 3 is the scanning electron microscope (SEM) photograph of the interface fracture sample after mixing WHDF-N type viscosity modifiers；
Fig. 4 is the scanning electron microscope of the interface fracture sample of the cement paste divergence for being not incorporated into WHDF-N type viscosity modifiers
Figure；
Fig. 5 is that the concrete test block after mixing WHDF-N type viscosity modifiers soaks exterior view after 90d；
Fig. 6 is exterior view after the concrete test block immersion 90d for being not incorporated into WHDF-N type viscosity modifiers.
Specific embodiment
Detailed specific description is done to the present invention with reference to specific embodiment, but protection scope of the present invention not office
It is limited to following examples.
WHDF-N type viscosity modifiers provided in the present invention, WH- technological invention units " Wuhan Institute of Chemical Technology " is (now more
Name " Wuhan Engineering Univ ") English alphabet abbreviation, DF- water blockoff waterproof material codes, during-N is characterized for self-compacting concrete,
Hereinafter referred to as WHDF-N.
Embodiment 1
The component and its percentage by weight of WHDF-N be：
Wherein, it is sodium hexameta phosphate that crystallization excites component, and activity excitation component is Melanteritum, and tricalcium aluminate constituents for suppressing is phosphorus
Gypsum Fibrosum, and component is easily adjusted for sodium naphthalene sulfonate, preventing microorganism component is carbamide.
WHDF-N is to form said components hybrid reaction, and its using method is together with glue during concrete-agitating
Gel material is added together.
Embodiment 2
The component and its percentage by weight of WHDF-N be：
Wherein, it is Alumen that crystallization excites component, and activity excitation component is semi-hydrated gypsum, and tricalcium aluminate constituents for suppressing is boron
Acid, it is sulfamic acid sodium that workability adjusts component, and preventing microorganism component is waterglass, and using method is with embodiment 1.
Embodiment 3
The component and its percentage by weight of WHDF-N be：
Wherein, it is sodium hexameta phosphate that crystallization excites component, and activity excitation component is Melanteritum, and tricalcium aluminate constituents for suppressing is phosphorus
Gypsum Fibrosum, and component is easily adjusted for sodium naphthalene sulfonate, preventing microorganism component is carbamide, and using method is with embodiment 1.
Embodiment 4
The component and its percentage by weight of WHDF-N be：
Wherein, it is Alumen that crystallization excites component, and activity excitation component is semi-hydrated gypsum, and tricalcium aluminate constituents for suppressing is boron
Acid, and component is easily adjusted for sulfamic acid sodium, preventing microorganism component is carbamide, and using method is with embodiment 1.
Embodiment 5
The component and its percentage by weight of WHDF-N be：
Wherein, it is sodium hexameta phosphate that crystallization excites component, and activity excitation component is Melanteritum, and tricalcium aluminate constituents for suppressing is phosphorus
Gypsum Fibrosum, and component is easily adjusted for sodium naphthalene sulfonate, preventing microorganism component is carbamide, and using method is with embodiment 1.
Embodiment 6
The component and its percentage by weight of WHD-N be：
Wherein, it is Alumen that crystallization excites component, and activity excitation component is semi-hydrated gypsum, and tricalcium aluminate constituents for suppressing is boron
Acid, and component is easily adjusted for sulfamic acid sodium, preventing microorganism component is waterglass, and using method is with embodiment 1.
Experimental result
With the WHDF-N type viscosity modifiers of embodiment 1-6, the contrast of self-compacting concrete bleeding quantity and the slump is carried out
Experiment, experimental result are as follows：
1. each embodiment working performance of concrete test is carried out
1 each embodiment working performance of concrete experimental result of table
| Embodiment | The slump/mm | Divergence/s | Final divergence/mm | V-type funnel/s | Comprcssive strength/MPa |
| Benchmark | 251 | 6 | 590 | 5 | 43.8 |
| 1 | 261 | 5 | 640 | 4 | 49.5 |
| 2 | 256 | 4 | 605 | 3 | 48.9 |
| 3 | 260 | 5 | 625 | 4 | 50.1 |
| 4 | 258 | 4 | 620 | 3 | 49.7 |
| 5 | 257 | 4 | 615 | 3 | 49.2 |
| 6 | 260 | 5 | 635 | 4 | 48.6 |
Test shows：The benchmark sample slump and divergence for not mixing WHDF-N reaches the requirement of standard, but with mix WHDF-
The concrete of N is compared, and the slump and divergence have obvious gap, and is mixed the concrete strength ratio of WHDF-N and do not mixed WHDF-N
Concrete strength improve 10-15%, caused by this is the mechanism of action of WHDF-N, hydrated cementitious speed accelerate, the gel of generation
Increase, the pore and aggregate interface in filling concrete stone, intensity is improved；Bleeding speed is moderate, concrete mix water conservation, guarantor
Performance of collapsing is good, and occurs without segregation phenomenon, and the plastic viscosity of fresh concrete is moderate, therefore, mix WHDF-N and improve concrete
While mixture intensity, the slump and divergence are also significantly improved.
2. carry out each embodiment concrete peak strain to test with limiting strain
2 each embodiment concrete peak strain of table and limiting strain experimental result
Test shows：Peak strain meansigma methodss and limiting strain meansigma methodss after mixing WHDF-N, during concrete axial compression
Respectively lower than the peak strain meansigma methodss of normal concrete and limiting strain meansigma methodss, this is also in that WHDF-N improves cement
Degree of hydration, in system, gel increases, and aggregate interface is improved, and early hydration heat drop is low so that the deformation performance of concrete
Improved.
Fig. 1 and Fig. 2 are the comparison diagram mixed with do not mix WHDF-N type viscosity modifier cement paste divergences (when 5 days)；Fig. 1
Show：After mixing WHDF-N type viscosity modifiers, mix water conservation function of slump protection is good, and bleeding is moderate, does not isolate, and does not also produce and splits
Seam；Fig. 2 shows：Do not mix the mix of WHDF-N type viscosity modifiers and not only bleeding but also isolated, and produce crack.
Fig. 3 and Fig. 4 are scanning electron microscope (SEM) comparison diagram mixed with do not mix WHDF-N type viscosity modifiers interface fracture sample；
Fig. 3 shows, after mixing WHDF-N type viscosity modifiers, the transition zone loose structure of concrete and microcrack are effectively improved；Fig. 4
Show, the concrete interface fracture for not mixing WHDF-N type viscosity modifiers has obvious microcrack and pore.
Fig. 5 and Fig. 6 are to mix to soak table after 90d with the super high-rise pumping concrete test block for not mixing WHDF-N type viscosity modifiers
Compare in face；Fig. 5 shows that after mixing WHDF-N type viscosity modifiers, concrete surface is smooth, and Fig. 6 shows, does not mix WHDF-N types
There is corrosion and peels off in the concrete surface of viscosity modifier.
Claims (6)
1. suitable for the WHDF-N type viscosity modifiers of self-compacting concrete, it is characterised in that its component is as follows, each component content
Percentage is：Crystallization excites component 15-25%；Activity excitation component 7-13%；Tricalcium aluminate constituents for suppressing 10-
15%；With easily regulation component 6-14%；Preventing microorganism component 2-6%；Water 30-40%.
2. WHDF-N type viscosity modifiers suitable for self-compacting concrete according to claim 1, it is characterised in that：Institute
The crystallization stated excites component for Alumen or sodium hexameta phosphate.
3. WHDF-N type viscosity modifiers suitable for self-compacting concrete according to claim 1, it is characterised in that：Institute
The activity excitation component stated is semi-hydrated gypsum or Melanteritum.
4. WHDF-N type viscosity modifiers suitable for self-compacting concrete according to claim 1, it is characterised in that：Institute
The tricalcium aluminate constituents for suppressing stated is boric acid or ardealite.
5. WHDF-N type viscosity modifiers suitable for self-compacting concrete according to claim 1, it is characterised in that：Institute
The component that adjusts state and easy is sodium naphthalene sulfonate or sulfamic acid sodium.
6. WHDF-N type viscosity modifiers suitable for self-compacting concrete according to claim 1, it is characterised in that：Institute
The preventing microorganism component stated is carbamide or waterglass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611010459.5A CN106517856A (en) | 2016-11-17 | 2016-11-17 | WHDF-N type viscosity modifier applicable to self-compacting concrete |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611010459.5A CN106517856A (en) | 2016-11-17 | 2016-11-17 | WHDF-N type viscosity modifier applicable to self-compacting concrete |
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| CN106517856A true CN106517856A (en) | 2017-03-22 |
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| CN201611010459.5A Pending CN106517856A (en) | 2016-11-17 | 2016-11-17 | WHDF-N type viscosity modifier applicable to self-compacting concrete |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108516753A (en) * | 2018-06-25 | 2018-09-11 | 武汉德毅环保新材料有限公司 | A kind of additives for Dry-Mixed Mortar and dry-mixed mortar and preparation method |
| CN112299758A (en) * | 2019-08-02 | 2021-02-02 | 安徽凯越电力杆塔有限公司 | High-strength self-compacting concrete and preparation method thereof |
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| CN1537821A (en) * | 2003-04-18 | 2004-10-20 | 张东辉 | Water-proof acid resistant heat resistant light heat insulating casting material and its manufacturing method |
| CN101234868A (en) * | 2007-12-10 | 2008-08-06 | 闫炳润 | Bitumen-base infiltration crystallization type cement concrete waterproof antiseptic agent |
| CN102491670A (en) * | 2011-11-22 | 2012-06-13 | 武汉工程大学 | WHDF-type water-reducing, seepage-proof and crack-resistant agent for concrete |
| CN102503214A (en) * | 2011-11-22 | 2012-06-20 | 武汉工程大学 | WHDF type concrete inorganic crack-resisting permeability-educing agent |
-
2016
- 2016-11-17 CN CN201611010459.5A patent/CN106517856A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1537821A (en) * | 2003-04-18 | 2004-10-20 | 张东辉 | Water-proof acid resistant heat resistant light heat insulating casting material and its manufacturing method |
| CN101234868A (en) * | 2007-12-10 | 2008-08-06 | 闫炳润 | Bitumen-base infiltration crystallization type cement concrete waterproof antiseptic agent |
| CN102491670A (en) * | 2011-11-22 | 2012-06-13 | 武汉工程大学 | WHDF-type water-reducing, seepage-proof and crack-resistant agent for concrete |
| CN102503214A (en) * | 2011-11-22 | 2012-06-20 | 武汉工程大学 | WHDF type concrete inorganic crack-resisting permeability-educing agent |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108516753A (en) * | 2018-06-25 | 2018-09-11 | 武汉德毅环保新材料有限公司 | A kind of additives for Dry-Mixed Mortar and dry-mixed mortar and preparation method |
| CN112299758A (en) * | 2019-08-02 | 2021-02-02 | 安徽凯越电力杆塔有限公司 | High-strength self-compacting concrete and preparation method thereof |
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Effective date of registration: 20180416 Address after: 430205, 16 floor, science and technology incubator building, Wuhan Institute of Technology, Wuhan, Hubei. Applicant after: Wuhan Tianyi new materials Co. Ltd. Address before: 430418 Wangji street, Wangji street, Xinzhou District, Wuhan, Hubei Applicant before: Wuhan Tianyi Group Co., Ltd. |
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Application publication date: 20170322 |