CN110240447A - A kind of control method of faced concrete surface stomata - Google Patents
A kind of control method of faced concrete surface stomata Download PDFInfo
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- CN110240447A CN110240447A CN201910525565.4A CN201910525565A CN110240447A CN 110240447 A CN110240447 A CN 110240447A CN 201910525565 A CN201910525565 A CN 201910525565A CN 110240447 A CN110240447 A CN 110240447A
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- clear
- water
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- control method
- water concrete
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
-
- 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
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a kind of control methods of faced concrete surface stomata, it is 2%-3% including using defoaming agent to adjust the initial air content of clear-water concrete slurry, it the use of the coefficient of plastic viscosity that water-reducing agent adjusts clear-water concrete slurry is 0.45-0.98Pas, yield stress is 100-200Pa, and the particle size range for screening coarse aggregate is 5-25mm.The method of the apparent mass of clear concrete of Practical Project adjustment at present is mostly empirical method, is not adjusted targetedly, wastes a lot of manpower and material resources.The present invention is not under conditions of changing existing construction technology, by adjusting the parameter of clear-water concrete slurry, repeat it is stable prepare the excellent clear-water concrete of apparent mass, better economy has good directive significance to Practical Project.
Description
Technical field
The invention belongs to clear-water concrete controlling of quality technologies, more particularly to a kind of faced concrete surface stomata
Control method.
Background technique
Clear-water concrete refers to one-pass molding, directly pours surface with concrete original or does protectiveness with transparency protected dose
Treated special concrete of the concrete surface as facing, smooth surface, without obvious color difference, corner angle are clearly demarcated, nothing
The technical requirements of clear-water concrete " the outer beauty of interior reality " are realized in damage and other issues by itself texture.
Clear-water concrete is increasingly becoming a kind of development trend, it has the advantages that very much, for example can be avoided building and repairs
Exterior material pollution on the environment, has concise, simple, true Appearance of Architecture effect etc., but the table of clear-water concrete
Face quality problems are still insoluble practical problem in engineering, and for stomata problem, current processing method has very much,
But mostly it is rule of thumb to be handled, there is very big randomness, therefore, need the table for proposing clear-water concrete from mechanism
The control method of face stomata repeats stable to make the excellent clear-water concrete of apparent mass.
Summary of the invention
Goal of the invention: it is directed to above-mentioned technical problem of the existing technology, the present invention provides a kind of clear-water concrete tables
The control method of face stomata, this method is different from blindly adjusting raw material and match ratio reaches the method for clear water effect, is biased to
In the surface pores for regulating and controlling clear-water concrete in terms of mechanism, apparent mass of clear concrete is targetedly solved the problems, such as.
Technical solution: the control method of faced concrete surface stomata of the present invention includes the following steps:
Step 1: screening coarse aggregate, obtains the coarse aggregate that particle size range is 5-25mm；Clear water is made according to routine techniques
Concrete mortar；
Step 2: weighing water-reducing agent, volume is the 0.5%-2% of cementitious material quality, adjusts clear-water concrete slurry
Coefficient of plastic viscosity be 0.45-0.98Pas, yield stress be 100-200Pa range；
Step 3: weighing defoaming agent, volume is the 0-5 ‰ of cementitious material quality, adjusts the first of clear-water concrete slurry
Beginning air content is 2%-3% range；
Step 4: raw material are added in blender, clear-water concrete is stirred to get, is poured into mold, is put after vibrating
Enter concrete standard fog room to be conserved.
The other configurations of clear-water concrete involved in the application use conventional method, wherein the gel rubber material is at this
Patent middle finger cement, flyash, slag powders quality summation.
The present invention from clear-water concrete generate surface pores generate mechanism, guarantee raw material be same producer,
Same batch, in parameters of construction technology (vibrating time, frequency of vibrating, position of vibrating) identical and reasonable situation, by adjusting
The rheological parameters (initial air content, viscosity coefficient, yield stress etc.) of clear-water concrete slurry, targetedly regulation is clear
The surface pores of water coagulation soil obtains the more excellent clear-water concrete of apparent mass.The surface quality problems of clear-water concrete
It is still insoluble practical problem in engineering, current processing method has very much, for example continuously adjusts raw material and match
Composition and division in a proportion, attempt unlike material template and different types of release agent, then make a large amount of template and be compared, finally
According to apparent mass, more excellent template selects parameter, and it is rule of thumb to be handled that these are mostly, with very big random
Property, and take time and effort, once raw material are changed, it is necessary to repeated work.
Further, the initial air content of clear-water concrete slurry can be surveyed by concrete 's air-containing analyzer
It is fixed, air content number can be adjusted by defoaming agent and air entraining agent.
Further, the coefficient of plastic viscosity of clear-water concrete slurry can by concrete rheological characteristic tester into
Row measurement, the coefficient of plastic viscosity of slurry can be adjusted by water-reducing agent.
Further, measure viscosity coefficient when need by clear-water concrete slurry coarse aggregate reject, prevent rotor and
Coarse aggregate collision, damaging rotor and influence test data.
Further, when measuring viscosity coefficient, concrete rheological characteristic tester is programmed to four-stage: 1)
Slow phase run: revolving speed 0.1-0.5RPM, duration 50-60s；2) boost phase: duration 100-150s, revolving speed
It is divided into 10 gradients, each gradient speedup 10-15RPM, duration 10-15s；3) constant velocity stage: duration 50-
60s, revolving speed 100-150RPM；4) decelerating phase: duration 100-150s, revolving speed are divided into 10 gradients, and each gradient is slowed down
10-15RPM, duration 10-15s.
Further, data fitting is carried out using the parameter that concrete rheological characteristic tester obtains, model of fit is guest
Durham model, obtains yield stress.
The utility model has the advantages that compared with the existing methods, remarkable advantage of the invention are as follows: from clear-water concrete slurry surface gas
The mechanism that hole generates is set out, and the superficial phenomenon that raw material and match ratio bring fluidity of slurry can change is had ignored, and attacks this directly
Matter proposes series of parameters range, and the more excellent clear water coagulation of apparent mass can be obtained in this parameter area
Soil.It is convenient that the invention is that the research and development of clear-water concrete are brought, and what research staff and construction personnel can be purposive goes to adjust
The series of parameters of whole clear-water concrete slurry, so that the more excellent clear-water concrete of apparent mass is obtained, it is mixed for clear water
Solidifying geotechnique's journey has directive significance.
Specific embodiment
Technical solution of the present invention is described in further detail below with reference to specific embodiment.
The basic proportion for the conventional clear-water concrete that following embodiments use: water 154kg, cement 326kg, flyash
56kg, mine quarrel powder 86kg, sand 712kg, stone 1068kg.Wherein, gel rubber material (cement, flyash, mine quarrel powder) quality summation is
468kg。
Used in embodiment is portland cement, is the ordinary portland cement marked as 42.5, and with a collection of test specimen
Cement must assure that it is identical；
The coarse aggregate of table one and table three is continuous grading stone, and color is uniform, surface cleaning, partial size 5-25mm, clay content
≤ 1.0%, clod content≤0.5%, elongated particles≤15%；
The coarse aggregate of table five is continuous grading stone, and color is uniform, surface cleaning, clay content≤1.0%, clod content≤
0.5%, elongated particles≤15%；
Fine aggregate is middle sand, fineness modulus 2.5-3.0, clay content≤1.5%, clod content≤1.0%；
Admixture is II grade of flyash；
Water-reducing agent must be adapted with cement type, guarantee concrete workability, the feature of environmental protection, must not there is pernicious gas；
Water uses daily drinking water, it is necessary to colorless and odorless；
Template is the detachable plank sheathing of self-control of 50 × 10 × 50CM.
When measuring viscosity coefficient, concrete rheological characteristic tester is programmed to four-stage: 1) slowly operating rank
Section: revolving speed 0.1RPM, duration 60s；2) boost phase: duration 100s, revolving speed are divided into 10 gradients, each gradient
Speedup 10RPM, duration 10s；3) constant velocity stage: duration 60s, revolving speed 100RPM；4) decelerating phase: when continuing
Between 100s, revolving speed is divided into 10 gradients, each gradient deceleration 10RPM, duration 10s.
Embodiment 1
Embodiment 1-8 is a kind of clear-water concrete that strength grade is C40, and specific raw material composition is as shown in the table:
Table 1
The preparation step of clear-water concrete is as follows in embodiment 1-8:
Weighing: portland cement, water, flyash, slag powders, sand, stone, water-reducing agent are weighed according to the proportion of table 1；
Siccative mixing: concrete mixer is added in portland cement, flyash, slag powders, sand, stone, is stirred evenly；
Clear-water concrete mixing: the siccative stirred evenly is added in load weighted water and water-reducing agent, stirs evenly, obtains
Clear-water concrete, and by the air content of the air entraining agent of different addition quantity and defoaming agent control clear-water concrete slurry, it obtains just
The embodiment 1-8 of beginning air content in gradient；
Clear-water concrete vibrates: obtained clear-water concrete slurry being poured into homemade clear-water concrete mold and (is used
Release agent brushing is uniform) in, it pours, every layer pours and all vibrates, and guarantees the work of vibrating in embodiment 1-8 point two layers
Skill parameter (vibrating time, frequency of vibrating, position of vibrating) is consistent；
Clear-water concrete maintenance: vibrating and finish, and the upper surface of test specimen is carried out overlay film, is placed in concrete standard maintenance
Room maintenance；
Apparent mass of clear concrete compares: after demoulding, carrying out processing of taking pictures to the surface of test specimen and template contacts, so
Image procossing is used afterwards, compares its apparent mass.
Table two
Table second is that embodiment 1-8 apparent mass comparing result, as can be seen from the table when the range of initial air content exists
When 2%-3%, the apparent mass of clear-water concrete test specimen is preferable；When wherein initial air content is 1%, clear-water concrete slurry
Mobile performance it is poor, so apparent mass is poor.
Based on the result that this is tested, follow-up test guarantees the initial air content of clear-water concrete slurry in 2%-
In 3% range.
Embodiment 9-16 is a kind of clear-water concrete that strength grade is C40, changes the volume of water-reducing agent, specific
Raw material composition is as shown in the table:
Table three
The preparation step of clear-water concrete is as follows in embodiment 9-16:
Weighing: portland cement, water, flyash, slag powders, sand, stone, water-reducing agent are weighed according to the proportion of table 3；
Siccative mixing: concrete mixer is added in portland cement, flyash, slag powders, sand, stone, is stirred evenly；
Clear-water concrete mixing: the water-reducing agent of load weighted water and different addition quantity is added to the siccative stirred evenly, stirring
Uniformly, clear-water concrete is obtained, and controls the gassiness of clear-water concrete slurry by the air entraining agent of different addition quantity and defoaming agent
Amount is in 2%-3%；
Mixture parametric measurement: different groups of clear-water concrete slurry is taken respectively, uses concrete rheological characteristic tester
Measure the coefficient of plastic viscosity and yield stress of clear-water concrete slurry；
Clear-water concrete vibrates: obtained clear-water concrete slurry being poured into homemade clear-water concrete mold and (is used
Release agent brushing is uniform) in, it pours, every layer pours and all vibrates, and guarantees the work of vibrating in embodiment 9-16 point two layers
Skill parameter (vibrating time, frequency of vibrating, position of vibrating) is consistent；
Clear-water concrete maintenance: vibrating and finish, and the upper surface of test specimen is carried out overlay film, is placed in concrete standard maintenance
Room maintenance；
Apparent mass of clear concrete compares: after demoulding, carrying out processing of taking pictures to the surface of test specimen and template contacts, so
Image procossing is used afterwards, compares its apparent mass.
Table four
Table fourth is that embodiment 9-16 apparent mass comparing result, as can be seen from the table when water-reducing agent volume exists
When 1.0%-1.2% range, when coefficient of plastic viscosity is within the scope of 0.45-0.98Pas, yield stress is in 100-200Pa model
When enclosing interior, the apparent mass of clear-water concrete test specimen is preferable.
Table five
The preparation step of clear-water concrete is as follows in embodiment 17-25:
Weighing: portland cement, water, flyash, slag powders, sand, water-reducing agent are weighed according to the proportion of table five, wherein stone
Son is weighed according to the ratio of different-grain diameter；
Siccative mixing: concrete mixer is added in portland cement, flyash, slag powders, sand, stone, is stirred evenly；
Clear-water concrete mixing: the siccative stirred evenly is added in load weighted water and water-reducing agent, stirs evenly, obtains
Clear-water concrete, and the air content of clear-water concrete slurry is controlled in 2%- by the air entraining agent of different addition quantity and defoaming agent
3%；
Clear-water concrete vibrates: obtained clear-water concrete slurry being poured into homemade clear-water concrete mold and (is used
Release agent brushing is uniform) in, it pours, every layer pours and all vibrates, and guarantees the work of vibrating in embodiment 9-16 point two layers
Skill parameter (vibrating time, frequency of vibrating, position of vibrating) is consistent；
Clear-water concrete maintenance: vibrating and finish, and the upper surface of test specimen is carried out overlay film, is placed in concrete standard maintenance
Room maintenance；
Apparent mass of clear concrete compares: after demoulding, carrying out processing of taking pictures to the surface of test specimen and template contacts, so
Image procossing is used afterwards, compares its apparent mass.
Table six
Table sixth is that embodiment 17-25 apparent mass comparing result, as can be seen from the table when coarse aggregate size range exists
When 5-25mm, the apparent mass of clear-water concrete test specimen is preferable.
In summary test result can obtain: the initial air content of clear-water concrete slurry is in 2%-3% range, clearly
In 0.45-0.98Pas range, the yield stress of clear-water concrete slurry exists the coefficient of plastic viscosity of water coagulation soil paste body
When 100-200Pa range, the particle size range of coarse aggregate is 5-25mm, and water-reducing agent volume, can be in 1.0%-1.2% range
Obtain the more excellent clear-water concrete of apparent mass.
Claims (8)
1. a kind of control method of faced concrete surface stomata, which is characterized in that diminishing is added in clear-water concrete slurry
The coefficient of plastic viscosity that agent adjusts clear-water concrete slurry is 0.45-0.98Pas, yield stress 100-200Pa；Addition disappears
The initial air content that infusion adjusts clear-water concrete slurry is 2%-3%.
2. the additional amount of the water-reducing agent is the 0.5-2% of cementitious material quality, the additional amount of the defoaming agent is cementitious material
The 0-5 ‰ of quality, wherein the cementitious material quality refer to cement, flyash, slag powders quality summation.
3. the control method of faced concrete surface stomata according to claim 1, it is characterised in that: the water-reducing agent is
One or more of esters polycarboxylate water-reducer, ethers polycarboxylic acid water reducing agent, naphthalene series high-efficiency water-reducing agent.
4. the control method of faced concrete surface stomata according to claim 1, it is characterised in that: the defoaming agent is
One or more of organosiloxane defoaming agent, polyethers defoaming agent, higher alcohols defoaming agent.
5. the control method of faced concrete surface stomata according to claim 1, it is characterised in that: clear-water concrete slurry
The coefficient of plastic viscosity of body is measured by concrete rheological characteristic tester, starches clear-water concrete when measuring viscosity coefficient
Coarse aggregate in body is rejected, and prevents rotor and coarse aggregate from colliding, damaging rotor and influence test data.
6. the control method of faced concrete surface stomata according to claim 5, it is characterised in that: measurement viscosity coefficient
When, concrete rheological characteristic tester is programmed to four-stage: 1) slow phase run: revolving speed 0.1-0.5RPM is held
Continuous time 50-60s；2) boost phase: duration 100-150s, revolving speed are divided into 10 gradients, each gradient speedup 10-
15RPM, duration 10-15s；3) constant velocity stage: duration 50-60s, revolving speed 100-150RPM；4) it the decelerating phase: holds
Continuous time 100-150s, revolving speed are divided into 10 gradients, each gradient deceleration 10-15RPM, duration 10-15s.
7. the control method of faced concrete surface stomata according to claim 1, it is characterised in that: yield stress passes through
The parameter that concrete rheological characteristic tester obtains carries out data and is fitted to obtain.
8. the control method of faced concrete surface stomata according to claim 1, it is characterised in that: coarse aggregate is according to grain
The range of diameter 5-25mm weighs.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112525768A (en) * | 2020-12-25 | 2021-03-19 | 武汉三源特种建材有限责任公司 | Method for detecting defoaming rate of cement base material defoaming agent |
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| JPH11116312A (en) * | 1997-10-09 | 1999-04-27 | Fujita Corp | Concrete for refractory coating and concrete molded product |
| CN101284721A (en) * | 2007-04-11 | 2008-10-15 | 上海建工材料工程有限公司 | Cement concrete composition for divergence-controlled pouring construction and construction method |
| CN108545988A (en) * | 2018-05-10 | 2018-09-18 | 北京市蓝宝新技术股份有限公司 | Clear-water concrete special additive and preparation method thereof and the clear-water concrete comprising it and application |
-
2019
- 2019-06-18 CN CN201910525565.4A patent/CN110240447A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11116312A (en) * | 1997-10-09 | 1999-04-27 | Fujita Corp | Concrete for refractory coating and concrete molded product |
| CN101284721A (en) * | 2007-04-11 | 2008-10-15 | 上海建工材料工程有限公司 | Cement concrete composition for divergence-controlled pouring construction and construction method |
| CN108545988A (en) * | 2018-05-10 | 2018-09-18 | 北京市蓝宝新技术股份有限公司 | Clear-water concrete special additive and preparation method thereof and the clear-water concrete comprising it and application |
Non-Patent Citations (3)
| Title |
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| 尉洪利: "砂浆塑性粘度对自密实清水混凝土表观性能的影响", 《汉斯土木工程》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112525768A (en) * | 2020-12-25 | 2021-03-19 | 武汉三源特种建材有限责任公司 | Method for detecting defoaming rate of cement base material defoaming agent |
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