CN107311497A - Maintaining swelling agent and preparation method thereof in a kind of concrete - Google Patents
Maintaining swelling agent and preparation method thereof in a kind of concrete Download PDFInfo
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- CN107311497A CN107311497A CN201611216596.4A CN201611216596A CN107311497A CN 107311497 A CN107311497 A CN 107311497A CN 201611216596 A CN201611216596 A CN 201611216596A CN 107311497 A CN107311497 A CN 107311497A
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
-
- 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
- C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
-
- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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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 discloses maintaining swelling agent in a kind of concrete and preparation method thereof.Maintaining swelling agent is made up of expansive clinker and porous micro medium in concrete of the present invention, swelling agent plays compensation contraction, porous micro medium reaches that the effect of swelling agent Hydration is reduced and optimized in interior maintenance by humidity regulation, functions simultaneously as the dispersible carrier of expansive clinker.Maintaining swelling agent takes full advantage of the cooperative effect of the two in prepared concrete, concrete self-shrinkage can be effectively reduced, dries and shrinks, and the temperature drop stage reduction temperature shrinkage after concrete temperature rise, simultaneously the degree of hydration of concrete can be improved, overcome in mix swelling agent reduction intensity the drawbacks of.
Description
Technical field
The invention belongs to building material field, and in particular to maintaining swelling agent and preparation method thereof in a kind of concrete.
Background technology
The concrete structure for actually pouring shaping is in the environment of aquation-temperature-humidity-constraint multi- scenarios method effect,
Concrete can be caused to produce contraction distortion and internal stress in the presence of this multi- scenarios method, when the tensile strength of concrete is not enough
When receiving stress to resist concrete, concrete will cracking phenomenon.This cracking phenomena is with cement fineness and early water
Change speed raising and more serious, the generally existing in the structures such as continuous sidewall structure, bottom plate, middle plate and top plate.Crack
Produce to be on active service to durability and structure safely and bring threat and challenge, follow-up crack repairing also brings along larger cost.Cause
This, takes appropriate action to control critical eigenvalue and seems particularly necessary.
The reason for causing concrete to produce early-age shrinkage strain cracking mainly has two kinds：(1) humidity is deformed, and is mainly reflected in
Self-constriction and dry contraction；(2) temperature deformation, be mainly reflected in concrete hydrating temperature rise and with surrounding environment heat exchange produce
Expand with heat and contract with cold.Therefore, can also be by way of filling functional material, to compensate in addition to carrying out the maintenance of construction time heat and moisture preserving
Volume change of concrete reduces concrete shrinkage deformation to reduce concrete structure cracking risk by humidity regulation, especially
The cracking risk in temperature drop stage.
Publication number CN101774777B, CN102219422B, CN102745933B discloses a kind of related to calcium oxide
Swelling agent, the expansion performance of such swelling agent is very fast, has often been played substantially before the actual casting concrete temperature drop stage,
Effective compensation can not be produced in the temperature drop stage to shrink, expansion course control is poor, thus has cracking degree improvement
Limit, and interior mix often reduces concrete strength.
Publication number CN104671688A discloses a kind of modified oxidized calcium class expansive clinker, its preparation method and its application.
The calcium carbonate of densification is formed on expansive clinker surface using the reaction between carbon dioxide and expansive clinker, and in dispersible carrier
It is mixed with and obtains modified calcium oxide swelling agent.Although such swelling agent is by modified in terms of swell increment and expansion course
Optimization lifting has been obtained, but it is still limited in the compensation contractility in temperature drop stage, and concrete still can be reduced when mixing inside
Intensity.
Publication number CN103342494B disclose a kind of heat of hydration suppressive concrete expansion material and preparation method thereof with
Using such expanding material is compounded with swelling agent, hydration inhibitors and interior sealing compound, make use of the compensation of swelling agent to shrink and makees
Concrete is reduced to the Optimum Regulation effect of temperature history and the interior maintenance action of high hydroscopic resin with, hydration inhibitors
Cracking risk.But in fact, interior maintenance high hydroscopic resin used still suffers from problem in practical engineering application, such expands
High hydroscopic resin does not absorb water in advance when being mixed in material, and interior maintenance effect is limited, and additionally water suction forms colloid to high hydroscopic resin when mixing outside,
This colloid often skewness when mixing building has production to stir, easily in inside concrete formation hole defect, reduction is strong
Degree.In addition heat of hydration regulating effect is possible to be fluctuated by concrete raw material, (construction seasons are influenceed for construction factor and seasonal factor
Concrete molding temperature) influence, actual use before need to carry out a large amount of system tests so that such expanding material application
Cost is higher, and universality is not strong.
Publication number CN102674738B discloses a kind of Multifunctional anti-crack additive and preparation method thereof, swollen using calcium oxide
The anti-crack additive that swollen quantity, dextrin and flyash combined grinding are prepared is realized to be gone through to Concrete Structure Temperature and expansion
The regulation and control of journey, to reduce cracking resistance risk to greatest extent.But the anti-crack additive still suffers from expansion performance soon, expands course adjustability
The problem of limited and reduction intensity.
Publication number CN105130335A discloses a kind of lower shrinkage cracking resistance C60 shunk based on interior maintenance, compensation with toughness reinforcing
Level self-compaction bridge tower concrete and preparation method thereof, it is mainly for C60 grades of self-compaction Tower Bridge concrete, to urban track traffic
Engineering and basement wall slab structural concrete are not applied to simultaneously.
In the above art, it is related to expansive clinker, interior sealing compound, heat of hydration controlled material, compensation is played respectively and is received
Contracting effect, interior humidity regulation and control decrement effect and heat of hydration regulating and controlling effect.At present, practical engineering application it is more or with fill
The compensation contraction that swelling agent is brought reduces concrete cracking risk, and it is limited in the compensation contractive effect in temperature drop stage,
Can not effective control critical eigenvalue generation, while also because substitution partial gelation material causes concrete strength to reduce.Accordingly, it would be desirable to pin
To above mentioned problem, the validity of convenience and cracking resistance decrement based on construction considers, prepares a kind of novel and multifunctional swelling agent.
The content of the invention
In view of the deficiencies of the prior art, the present invention provides maintaining swelling agent in a kind of concrete, with interior maintenance
The porous micro medium of effect is as the dispersible carrier of expansive clinker, and swelling agent, which is played, compensates contraction, and porous micro medium passes through
Humidity regulation conserves decrement and the effect of optimization swelling agent Hydration in playing, and reaches and is included in the concrete temperature drop stage
Compensation is shunk, the later stage continue in maintenance humidity regulation and control decrement purpose, and then reduce in whole construction and concrete service phase
Cracking risk, while hydrated cementitious degree can also be improved, overcome in the drawbacks of mix swelling agent reduction concrete strength.
For achieving the above object, the technical solution adopted in the present invention is：
Maintaining swelling agent in a kind of concrete, including expansive clinker and porous micro medium, wherein, matter shared by expansive clinker
Amount is than being 20%~60%, and mass ratio shared by porous micro medium is 40%~80%；
The expansive clinker be calcium oxide expansive clinker, including free calcium oxide, aluminium sulfate and anhydrous gypsum and its
Mixture；
The porous micro medium is that any one or two kinds of rice hull ash and levigate porous light-weight aggregate are compounded with arbitrary proportion
Mixture；
The rice hull ash average grain diameter is 5 μm~80 μm, and the levigate porous light-weight aggregate particle diameter is 5 μm~160 μm.
The levigate porous light-weight aggregate by porous light-weight aggregate carry out it is levigate be made, levigate preceding 24h water absorption rates be 8%~
25%.
Preferably, 700 grades~900 grades shale light-weight aggregates may be selected in the levigate porous light-weight aggregate.
The preparation method of maintaining swelling agent, comprises the following steps in the concrete：
(1) prepared by expansive clinker powder：It is 200~400m by expansive clinker grinding to specific surface area2/ kg, is expanded
Clinker powder；
(2) prepared by porous micro medium：Handle and screen the satisfactory rice hull ash of particle diameter or levigate porous light-weight aggregate or two
The mixture of person's arbitrary proportion；
(3) expansive clinker powder is mixed with porous micro medium according to quantity, obtains maintaining swelling agent in the concrete.
Present invention also offers the application process of maintaining swelling agent in the concrete, maintaining is swollen in the concrete
Swollen dose can using substitute binder materials in mix by the way of use, can also be used by the way of mixing outside；The mode mixed within recommendation
Admixture, its volume is calculated with the total binder materials mass percent of concrete, recommends optimum adding quantity of pulverized to be 4~6% for plate structure,
Sidewall structure recommends optimum adding quantity of pulverized to be 8~10%.
Maintaining swelling agent in the concrete, tackles coagulation local prescription water consumption and is adjusted, according to list when in use
Square concrete porous micro medium consumption and 24h water absorption rates, calculating obtain the additional water consumptions of 24h, then the extra increased use of concrete
Water is 0.8 times of the additional water consumptions of 24h.
Beneficial effects of the present invention：
(1) maintaining swelling agent in the concrete prepared based on the present invention, can have larger cracking in concrete structure
The temperature drop stage of risk plays decrement effect, effectively reduces cracking risk, while can continue to play interior maintenance humidity regulation and control decrement
Effect, degree of hydration can also be improved while concrete shrinkage deformation is reduced, and making up interior swelling agent of mixing reduces concrete strength
Defect.
(2) maintaining swelling agent in a kind of concrete that the present invention is provided, method of preparation and use is simple, convenient construction,
Comprehensive Crack-Resistance cost is low.
Brief description of the drawings
Fig. 1 is the temperature history after certain city track traffic engineering underground side wall concrete is poured.
Fig. 2 is self-constriction test result under the normal temperature condition of embodiment 1.
Fig. 3 is the temperature match curing conditions lower volume deformation test result of embodiment 1.
Fig. 4 is self-constriction test result under the normal temperature condition of embodiment 2.
Fig. 5 is the temperature match curing conditions lower volume deformation test result of embodiment 2.
Fig. 6 is self-constriction test result under the normal temperature condition of embodiment 3.
Fig. 7 is the temperature match curing conditions lower volume deformation test result of embodiment 3.
Embodiment
For a better understanding of the present invention, with reference to embodiment the present invention is furture elucidated content, but the present invention is not only
Following example is limited only to, in the present invention, except there is special instruction, all percentage compositions are mass percent.
Embodiment 1
Commercially available calcium oxide expansive clinker is broken into specific surface area 200m2/ kg powder, is 20 μm from average grain diameter
Rice hull ash, is sufficiently mixed in rear concrete batching according to the ratio of calcia linker 40%, rice hull ash 60% and conserves swelling agent
IEA-I 10kg。
Certain railway traffic engineering subway station side wall concrete match ratio according to table 1 prepares concrete, wherein base
Quasi- group is is not spiked with any swelling agent, and EA groups fill commercially available calcium oxide expansion agents, prepared by the IEA-I groups admixture present invention
Interior maintaining swelling agent IEA-I, the mode that substitution binder materials is mixed within two kinds of expanding materials are equal is spiked into concrete, is filled
Measure as 8%, wherein, it is 11% according to rice hull ash 24h water absorption rates, calculates folk prescription water consumption and increase 1.6kg.According to《It is common mixed
Solidifying soil mechanics method for testing performance standard》GB/T50081-2002 tests the compression strength of concrete, according to《Normal concrete is long
Phase performance and endurance quality test method standard》GB/T50082-2009 test concrete self-shrinkage deformations, according to《Concrete is swollen
Swollen dose》GB23439-2009 tests EA and IEA-I limited expansion rate.In order to further evaluate interior maintaining swelling agent in coagulation
Soil temperature depression of order section compensation contractive effect, according to station side wall concrete solid temperature monitoring curve (as shown in figure 1, setting for convenience
Alternating temperature program is put, smoothing processing has been carried out to entity monitoring curve), it can be seen that coagulation from the entity monitoring result shown in Fig. 1
Native molding temperature is 35 DEG C, in the temperature rise of 1.5d inner concretes to 71 DEG C, then starts cooling, coagulation with about 6.5 DEG C/d speed
The native too fast gesture of the temperature drop rate temperature drop shrinkage stress more larger than that can produce, easily produces vertical temperature and splits under the constraint such as ground
Seam.Set and become incubator alternating temperature course, carry out the deformation test under temperature match curing conditions, concreting is entered in pvc pipe before test, buried
Enter after poor group of formula strain gauge, whole test specimen is sealed with aluminium-foil paper.
Concrete mix (the kg/m of table 13)
Concrete crushing strength and limited expansion rate test result as shown in table 2, as a result show, commercially available calcium oxide is swollen
Maintaining swelling agent IEA-I meets II type requirements, the EA that admixture mass ratio is 8% in concrete prepared by swollen dose of EA and the present invention
Afterwards, concrete different larval instar intensity decreases about 8%~10% or so, admixture IEA-I after, concrete morning age strength substantially not by
Influence, and later strength gets a promotion.
The mechanical property of table 2 and limited expansion rate test result
The normal temperature laboratory Under Concrete self-constriction test result according to as defined in standard is mixed as shown in Fig. 2 as a result show
Plus after EA and IEA-I, concrete self-shrinkage can be effectively eliminated, and bring considerable expansion, it should be pointed out that after admixture EA, mix
Solidifying soil expansion performance after 20d ages is played totally, is started afterwards after the trend for occurring shrinking, admixture IEA-I, concrete is rear
Phase still shows prolonged expansion, shows that it integrates expansion performance and is better than EA.
As a result deformation test under the alternating temperature course monitored based on entity as shown in figure 3, show, in temperature rise stage, IEA-I
The swell increment brought slightly above EA, in the temperature drop stage, 5 μ ε have been compensated only for after filling EA compared with benchmark, and are filled IEA-I and then mended
36 μ ε are repaid, it can thus be seen that compensation Reduce shrinkage effects of the IEA-I in whole concrete temperature course excursion is better than EA, especially
It is the compensation contraction in the temperature drop stage, can effectively reduce the cracking risk of concrete.
Embodiment 2
Commercially available calcium oxide expansive clinker is broken into specific surface area 400m2/ kg powder, from 700 grades of shale light-weight aggregates,
It is 5~80 μm to be crushed to particle size range, and its 24h liquid absorbency rate is 23.5%, according to calcia linker 40%, levigate light collection
The ratio of material 60% is sufficiently mixed maintenance swelling agent IEA-II 10kg in rear concrete batching.
Certain railway traffic engineering subway station side wall concrete match ratio according to table 3 prepares concrete, wherein base
Quasi- group is is not spiked with any swelling agent, and EA groups fill commercially available calcium oxide expansion agents, and IEA-II groups are prepared for the admixture present invention
Interior maintaining swelling agent IEA-II, mixed within two kinds of expanding materials are equal substitution binder materials mode be spiked into concrete,
Fill as 9%.Wherein, it is 23.5% according to light-weight aggregate 24h water absorption rates, calculates folk prescription water consumption and increase 3.8kg.According to《It is general
Logical mechanical performance of concrete test method standard》GB/T50081-2002 tests the compression strength of concrete, according to《Common coagulation
Native long-term behaviour and endurance quality test method standard》GB/T50082-2009 test concrete self-shrinkage deformations, according to《Coagulation
Soil expansion agent》GB23439-2009 tests EA and IEA-II limited expansion rate.The temperature history according to Fig. 1 is become simultaneously
Deformation test under the conditions of temperature.
Concrete mix (the kg/m of table 33)
Concrete crushing strength and limited expansion rate test result as shown in table 4, as a result show, commercially available calcium oxide is swollen
Maintaining swelling agent IEA-II meets II type requirements in concrete prepared by swollen dose of EA and the present invention, and admixture mass ratio is 9%
After EA, concrete different larval instar intensity decreases about 10%~12% or so are filled after IEA-II, and concrete morning age strength is basic
It is unaffected, and later strength gets a promotion.
The mechanical property of table 4 and limited expansion rate test result
The normal temperature laboratory Under Concrete self-constriction test result according to as defined in standard is mixed as shown in figure 4, as a result show
Plus after IEA-II, its early expansion efficiency is suitable with EA, and prolonged expansion is still shown in the later stage, and bring bigger expansion
Amount, shows that it integrates expansion performance and is better than EA.
As a result deformation test under the alternating temperature course monitored based on entity as shown in figure 5, show, in temperature rise stage, IEA-
The swell increment that II is brought helps to form expansion compression in armored concrete apparently higher than EA.In the temperature drop stage, with benchmark
Compare, compensated only for 5 μ ε after admixture EA, the compensation effect in temperature drop stage is limited, and fills IEA-II and then compensate for 53 μ ε, thus
It can be seen that compensation Reduce shrinkage effects of the IEA-II in whole concrete temperature course excursion is better than EA, especially in temperature drop rank
The compensation contraction of section, can effectively reduce the cracking risk of concrete.
Embodiment 3
Commercially available calcium oxide expansive clinker is broken into specific surface area 300m2/ kg powder, from 900 grades of shale light-weight aggregates,
Particle size range is crushed to for 80~160 μm, its 24h liquid absorbency rate is 15.6%, according to calcia linker 30%, levigate light
70% ratio of gathering materials is sufficiently mixed maintenance swelling agent IEA-III10kg in rear concrete batching.
Certain railway traffic engineering subway station underplate concrete match ratio according to table 5 prepares concrete, wherein base
Quasi- group is is not spiked with any swelling agent, and EA groups fill commercially available calcium oxide expansion agents, and IEA-III groups are admixture according to the present invention
Maintaining swelling agent IEA-III in the concrete of preparation, the mode that substitution binder materials is mixed within two kinds of expanding materials are equal is filled
Into concrete, admixture mass ratio is 6%.Wherein, it is 15.6% according to light-weight aggregate 24h water absorption rates, calculates folk prescription water
Amount increases 2.0kg.According to《Standard for test methods of mechanical properties of ordinary concrete》GB/T 50081-2002 test the resistance to compression of concrete
Intensity, according to《Standard for test methods of longterm performance and durability of ordinary concrete standard》GB/T50082-2009 tests concrete is certainly
Contraction distortion, according to《Cement expansive material》GB23439-2009 tests EA and IEA-III limited expansion rate.Become simultaneously
Deformation test under the conditions of temperature.
Concrete mix (the kg/m of table 53)
Concrete crushing strength and limited expansion rate test result as shown in table 6, as a result show, commercially available calcium oxide is swollen
Maintaining swelling agent IEA-III meets II type requirements in concrete prepared by swollen dose of EA and the present invention, and admixture mass ratio is 6%
After EA, concrete different larval instar intensity decreases about 8%~10% or so are filled after IEA-III, and concrete morning age strength is basic
It is unaffected, and later strength gets a promotion.
The mechanical property of table 6 and limited expansion rate test result
The normal temperature laboratory Under Concrete self-constriction test result according to as defined in standard is mixed as shown in fig. 6, as a result show
Plus after EA, concrete expansion performance after 10d ages is played totally, is started the trend for occurring shrinking afterwards, is filled IEA-III
Afterwards, its early expansion efficiency is suitable with EA, and still shows in the later stage prolonged expansion, and brings bigger swell increment, shows
It integrates expansion performance and is better than EA.
As a result deformation test under the alternating temperature course monitored based on entity as shown in fig. 7, show, in temperature rise stage, IEA-
The swell increment that III is brought helps to form expansion compression in armored concrete, in the temperature drop stage, with base apparently higher than EA
Standard after admixture EA compared to 4 μ ε have been compensated only for, and the compensation effect in temperature drop stage is limited, and fills IEA-III and then compensate for 38 μ ε, by
This can be seen that compensation Reduce shrinkage effects of the IEA-III in whole concrete temperature course excursion is better than EA, especially in temperature
The compensation contraction of depression of order section, can effectively reduce the cracking risk of concrete.
Obviously, above-described embodiment is only intended to clearly illustrate made example, and the not limitation to embodiment.It is right
For those of ordinary skill in the art, can also make on the basis of the above description it is other it is various forms of change or
Change.There is no necessity and possibility to exhaust all the enbodiments.And the obvious change or change therefore amplified
Move within still in the protection domain of the invention.
Claims (6)
1. maintaining swelling agent in a kind of concrete, it is characterised in that：Including expansive clinker and porous micro medium, wherein, expansion
Mass ratio shared by clinker is 20% ~ 60%, and mass ratio shared by porous micro medium is 40% ~ 80%；
The expansive clinker is calcium oxide expansive clinker, including free calcium oxide, aluminium sulfate and anhydrous gypsum and its mixing
Thing；The porous micro medium is any one or two kinds of mixing compounded with arbitrary proportion of rice hull ash and levigate porous light-weight aggregate
Thing；
The rice hull ash average grain diameter is 5 μm ~ 80 μm, and the levigate porous light-weight aggregate particle diameter is 5 μm ~ 160 μm.
2. maintaining swelling agent in a kind of concrete according to claim 1, it is characterised in that the levigate porous light collection
Material is made by the progress of porous light-weight aggregate is levigate, and levigate preceding 24 h water absorption rates are 8% ~ 25%.
3. maintaining swelling agent in a kind of concrete according to claim 2, it is characterised in that the levigate porous light collection
700 grades ~ 900 grades shale light-weight aggregates may be selected in material.
4. the preparation method of maintaining swelling agent in a kind of concrete described in any one of claims 1 to 3, it is characterised in that
Comprise the following steps：
（1）It is prepared by expansive clinker powder：It is 200 ~ 400 m by expansive clinker grinding to specific surface area2/ kg, obtains expansive clinker powder
Body；
（2）It is prepared by porous micro medium：Handle and screen the satisfactory rice hull ash of particle diameter levigate porous light-weight aggregate or the two appoint
The mixture of meaning ratio；
（3）Expansive clinker powder is mixed with porous micro medium according to quantity, maintaining swelling agent in the concrete is obtained.
5. the application process of maintaining swelling agent in a kind of concrete described in any one of claims 1 to 3, it is characterised in that
The swelling agent is used by the way of can mixing or mix outside in；Within the mode mixed fill, its volume is always gelled material with concrete
Expect that mass percent is calculated, be 4 ~ 6% for plate structure volume, sidewall structure volume is 8 ~ 10%.
6. the application process of maintaining swelling agent in a kind of concrete according to claim 5, it is characterised in that described swollen
Coagulation local prescription water consumption is tackled when in use for swollen dose to be adjusted, inhaled according to folk prescription concrete porous micro medium consumption and 24 h
Water rate, calculating obtains the additional water consumptions of 24 h, then the extra increased water consumption of concrete is 0.8 times of the additional water consumptions of 24 h.
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| CN108733968A (en) * | 2018-02-05 | 2018-11-02 | 贵州省水利水电勘测设计研究院 | The implementation method of magnesium oxide concrete micro-expansibility stress compensation mathematical model |
| CN109856374A (en) * | 2018-12-26 | 2019-06-07 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | A kind of concrete self-shrinkage test method |
| CN110950603A (en) * | 2019-12-17 | 2020-04-03 | 中建商品混凝土有限公司 | High-strength anti-crack concrete and preparation method thereof |
| CN112142357A (en) * | 2020-08-21 | 2020-12-29 | 中交第二航务工程局有限公司 | Shrinkage inhibitor suitable for marine ultra-high performance concrete |
| CN116947399A (en) * | 2023-09-20 | 2023-10-27 | 上海建工集团股份有限公司 | Low-shrinkage low-energy-consumption ultra-high-performance concrete and preparation method thereof |
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