CN106995301A - C30 high performance concretes and preparation method thereof - Google Patents
C30 high performance concretes and preparation method thereof Download PDFInfo
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- CN106995301A CN106995301A CN201710242973.XA CN201710242973A CN106995301A CN 106995301 A CN106995301 A CN 106995301A CN 201710242973 A CN201710242973 A CN 201710242973A CN 106995301 A CN106995301 A CN 106995301A
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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
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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
- 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)
- 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 present invention relates to a kind of C30 high performance concretes, count by weight, its raw material includes：220~240 parts of PO42.5 class g cements, S95 grades of 90~110 parts of miberal powders, 85~95 parts of F (I) flyash, 810~836 parts of sand, 5 965~995 parts of 20mm Stones, 160~180 parts of water, 7.7~9.1 parts of additive.This kind of concrete not only has good mobile performance and meets the intensity of C30 concrete, while the heat inside horizontal floor is consumed in time, horizontal floor internal-external temperature difference reduces, and concrete surface crack in hardening process there's almost no.
Description
Technical field
The present invention relates to high performance concrete field, in particular, it is related to a kind of C30 high performance concretes and its system
Preparation Method.
Background technology
The concrete for constituting skyscraper usually requires possess higher strength grade, and good pump-conveying property, i.e.,
Mobile performance, but during practice of construction, the horizontal floor of skyscraper generally uses strength criterion for C30 concrete
Poured and can reach use intensity, reduce construction cost.
But the concrete poured is during hydrated cementitious, because the horizontal floor area poured is larger, horizontal building
The temperature drop of plate surface is very fast, and the temperature inside horizontal floor is steeply risen, and the heat of inside concrete can not be consumed, and tires out
Product is in inside concrete.With the hydration process of cement, horizontal floor internal-external temperature difference is increased, and the larger temperature difference is caused in concrete
Portion is different from outside shrinkage factor, concrete surface is produced crack, potential safety hazard occurs.
The content of the invention
It is an object of the invention to provide a kind of C30 high performance concretes, the concrete flowability can be good, and intensity reaches
C30 concrete strength standards, while the heat poured inside the horizontal floor of shaping is gradually consumed, the inside and outside temperature of horizontal floor
Difference difference reduces, and concrete free from flaw in hardening process is produced.
The present invention above-mentioned purpose technical scheme is that：A kind of C30 high performance concretes, by weight
Measure number meter, its raw material include 220~240 parts of PO42.5 class g cements, S95 grades of 90~110 parts of miberal powders, F (I) flyash 85~
95 parts, 810~836 parts of sand, 965~995 parts of 5-20mm Stones, 160~180 parts of water, 7.7~9.1 parts of additive.
It is preferred that, count by weight, its raw material includes：230 parts of PO42.5 class g cements, S95 grades of 100 parts of miberal powders, F
(I) 90 parts of flyash, 823 parts of sand, 980 parts of 5-20mm Stones, 170 parts of water, 8.4 parts of additive.
By using above-mentioned technical proposal, the water-cement ratio of the ultra-high pump concrete prepared is 0.4, and intensity reaches
C30 concrete strength standards；The content of fine aggregate and coarse aggregate is strict controlled according to the consumption of the binder materials such as cement
In the range of 0.81-0.87, fine aggregate is used cooperatively with coarse aggregate with cement, miberal powder, flyash, is ensureing that concrete reaches
While C30 intensity, it is ensured that the workability of concrete, the long distance pumping ability of high performance concrete is realized.
It is preferred that, the additive be amphoteric polycarboxylate water-reducer, dispersant, sodium alginate, poly- N- alkyl acrylics,
Ethanol.
It is preferred that, the amphoteric polycarboxylate water-reducer, dispersant, sodium alginate, poly- N- alkyl acrylics, the weight of ethanol
Measuring ratio is：2.5∶1∶0.5∶1∶2.
By using above-mentioned technical proposal, poly- N- alkyl acrylamides are cross-linked polymer, in poly- N- alkyl acrylamides
N atoms on lone pair electrons and ethanol between form hydrogen bond, ethanol is combined with poly- N- alkyl acrylamides, and enter poly- N- alkane
The cross-linked network of base acrylamide, now ethanol be stored between poly- N- alkyl acrylamides cross-linked network.Concrete is in hardening
During, hydrated cementitious heat release, concrete system temperature rise causes ethanol slowly to be separated out from poly- N- alkyl acrylamides, ethanol
During precipitation, the segment on poly- N- alkyl acrylamides is close to each other, makes the cross-linked network of poly- N- alkyl acrylamides
It is even closer, further promote the precipitation of ethanol.Ethanol heat gasification after precipitation, ethanol absorbs heat during gasification,
Heat inside horizontal floor is gradually consumed.
It is preferred that, the poly- N- alkyl acrylamides are poly-N-isopropyl acrylamide and poly-N-vinylcaprolactam
Mixture.
It is preferred that, the weight ratio of the poly-N-isopropyl acrylamide and poly-N-vinylcaprolactam is 1: 2.
By using above-mentioned technical proposal, the lower critical solution temperature of poly-N-vinylcaprolactam is than poly-N-isopropyl third
Acrylamide is high, and concrete is cooled in the ethanol that heating early stage can be discharged by poly-N-isopropyl acrylamide, works as coagulation
Native internal temperature reaches the lower critical solution temperature of poly-N-isopropyl acrylamide, and N- caprolactams start to separate out second
Alcohol, cools to inside concrete, and both use cooperatively can persistently be cooled in course of hardening.
It is preferred that, the amphoteric polycarboxylate water-reducer is maleic anhydride-monoethanolamine polycarboxylate water-reducer and acrylic acid-the third
The mixture of base sulfonic acid polycarboxylate water-reducer.
By using above-mentioned technical proposal, maleic anhydride-monoethanolamine polycarboxylate water-reducer and the poly- carboxylic of acrylic acid-propyl sulfonic acid
Sour water reducer is used cooperatively, and can adjust the content of the cation and anion in polycarboxylate water-reducer, make cation with it is cloudy from
Sub- content reaches balance, will not be because excessive cation exists and influences aggregation and the polycarboxylate water-reducer of anionic group
Charge density, separated out while nor affecting on ethanol from poly- N- alkyl acrylamides.
It is preferred that, the dispersant is the mixture of tetrapropylene benzene sodium sulfonate and sodium cetanesulfonate.
By using above-mentioned technical proposal, the hydrophobic side on tetrapropylene benzene sodium sulfonate and sodium cetanesulfonate is adsorbed
In poly- N- alkyl acrylamides molecular surface, the partial adsorbates of its water-wet side make poly- N- alkyl acryls in concrete system
Amine is preferably dispersed in concrete.
Another object of the present invention is to provide the preparation method of C30 high performance concretes described above.
The present invention above-mentioned purpose technical scheme is that：A kind of system of C30 high performance concretes
Preparation Method, comprises the following steps：
S1：Weigh and be stirred in sand, 5-20mm rubbles addition mixer by predetermined weight, mixing time is 10s, is mixed
Thing；
S2：PO42.5 class g cements, high-performance mineral admixture, S95 miberal powders, which are weighed, by predetermined weight adds obtained in S1 mixed
In compound, mixing time is 10s, obtains mixture；
S3：Amphoteric polycarboxylate water-reducer, water are weighed by predetermined weight, after both are mutually mixed, the mixture that S2 is obtained is added
In, mixing time is 60s, obtains mixture；
S4：Poly- N- alkyl acrylamides are weighed by predetermined weight, ethanol is added in pony mixer, stirred while adding sea
Mosanom, stirs 2min, and backward its adds dispersant, continues to stir 1min, obtains mixture；
S5：The mixture that S4 is obtained is added in the mixture that S3 is obtained, and is stirred 30s, is obtained finished product concrete.
By using above-mentioned technical proposal, ethanol is combined with poly- N- alkyl acrylamides first, into poly- N- alkyls
In the cross-linked network of acid amides, poly- N- alkyl acrylamides are scattered in cement slurry afterwards, after concreting, poly- N- alkyl third
Ethanol in acrylamide rises with concrete system temperature and gradually separated out, and the ethanol of precipitation absorbs heat in gasification, consumption
Heat inside horizontal floor, reduces concrete inside and outside temperature difference in hardening process.
In summary, the invention has the advantages that：
1st, the combination using ethanol in poly- N- alkyl acrylamides cross-linked network, ethanol is temporarily fixed to poly- N- alkyl third
In acrylamide, with the hardening process of concrete, the rise of concrete system temperature, ethanol inside poly- N- alkyl acrylamides by
Gradually separate out, the ethanol of precipitation consumes the internal heat of a part of horizontal floor in gasification, makes concrete internal temperature
It is unlikely to too high.
2nd, the use of amphoteric polycarboxylate water-reducer balances the quantity of cation and anion, when it adds concrete bodies
In system, the positive charge and negative electrical charge on cement can be adsorbed simultaneously, with good dispersion effect, while not influenceing poly- N- alkyl
Precipitation of the acrylamide to ethanol is acted on, and effectively increases the mobile performance and anti-freezing property of concrete.
Embodiment
Involved all substances are commercially available in the embodiment of the present invention.
The specification of used sample is as shown in table 1 in each embodiment.
The specification of used sample in the following embodiment of table 1
Raw material proportioning used is as shown in table 2 in each embodiment.
Constituent content in each embodiment of table 2
The preparation method of C30 high performance concretes in various embodiments above is as follows：
S1：Weigh and be stirred in sand, 5-20mm rubbles addition mixer by predetermined weight, mixing time is 10s, is mixed
Thing；
S2：PO42.5 class g cements, high-performance mineral admixture, S95 miberal powders, which are weighed, by predetermined weight adds obtained in S1 mixed
In compound, mixing time is 10s, obtains mixture；
S3：Amphoteric polycarboxylate water-reducer, water are weighed by predetermined weight, after both are mutually mixed, the mixture that S2 is obtained is added
In, mixing time is 60s, obtains mixture；
S4：Poly- N- alkyl acrylamides are weighed by predetermined weight, ethanol is added in pony mixer, stirred while adding sea
Mosanom, stirs 2min, and backward its adds dispersant, continues to stir 1min, obtains mixture；
S5：The mixture that S4 is obtained is added in the mixture that S3 is obtained, and is stirred 30s, is obtained finished product concrete.
The evaluation index and detection method that C30 high performance concretes prepared by various embodiments above are used are as follows：
The slump, divergence and T500：According to GB/T 50080《Standard for test methods of properties of ordinary concrete mixture standard》In rule
Model measures the slump when C30 high performance concretes prepared in each embodiment go out machine, slump flow test；
Anti-Chloride Ion Penetration：According to GB/T 50082《Standard for test methods of longterm performance and durability of ordinary concrete standard》
In quick chloride ion transport Y-factor method Y test the chlorions of the C30 high performance concrete reference blocks prepared in each embodiment
Penetration depth；
Water resistant permeance property：According to GB/T 50082《Standard for test methods of longterm performance and durability of ordinary concrete standard》In
Pressurization tests the infiltration depth of the C30 high performance concrete reference blocks prepared in each embodiment step by step；
Freezing and thawing performance：According to GB/T 50082《Standard for test methods of longterm performance and durability of ordinary concrete standard》In it is fast
Jelly method tests the mass loss rate of the C30 high performance concrete reference blocks prepared in each embodiment；
Anti-carbonation properties：According to GB/T 50082《Standard for test methods of longterm performance and durability of ordinary concrete standard》In carbon
Change carbonation depth of the C80 ultra-high pump concretes reference block prepared in each embodiment of experiment test at the 28th day；
Apparent property：The C30 high performance concretes prepared in each embodiment are carried out using SEM microcosmic
Detection；Compression strength：According to GB/T 50010《Code for design of concrete structures》In specification detection concrete standard test block exist
The compression strength with 100% fraction measured at the 7th day, the 14th day, the 28th day, the 56th day；
Temperature：According to GB/T 50108《Water-proof technology of underground projects code》C30 high performance concretes after to pouring are in 7 days
The maximum temperature of maximum temperature difference and inside concrete inside and outside uninterrupted detection, test concrete.
The performance indications of various embodiments above are as shown in table 3.
The performance test results of C30 high performance concretes prepared by each embodiment of table 3
As can be seen that present invention accomplishes the finger of the mobile performance of C30 high performance concretes and strength character from above-mentioned table
Mark, and surveyed by Anti-Chloride Ion Penetration test, the test of water resistant permeance property, anti-carbonation properties and freezing and thawing performance
Examination, the impermeabilisation ability of concrete standard test block is stronger, and almost free from flaw is produced concrete surface, meanwhile, the coagulation after pouring
Native internal-external temperature difference meets concrete construction code requirement.
Raw material proportioning used is as shown in table 4 in each comparative example.
Constituent content in each comparative example of table 4
The preparation method of each comparative example is consistent with embodiment 1.
The performance indications of each comparative example are as shown in table 5 above.
The performance test results of concrete prepared by each comparative example of table 5
| The performance test results | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | Comparative example 6 | Comparative example 7 |
| The slump/mm | 190 | 185 | 180 | 195 | 180 | 175 | 170 |
| Chloride permeability depth/mm | 4.0 | 4.3 | 4.8 | 3.9 | 3.7 | 3.7 | 3.8 |
| Seep water depth/mm | 10 | 11 | 13 | 10 | 10 | 10 | 11 |
| Carbonation depth/mm | 1.5 | 1.5 | 1.8 | 1.4 | 1.5 | 1.4 | 1.6 |
| Mass loss rate/% | 2.9 | 3.0 | 3.2 | 2.5 | 2.6 | 2.5 | 2.7 |
| Apparent property | Free from flaw | Free from flaw | There is crack | Free from flaw | Free from flaw | Free from flaw | Free from flaw |
| 56th day compression strength/MPa | 38.2 | 37.6 | 37.2 | 38.3 | 38.4 | 37.1 | 37.4 |
| Maximum temperature difference/DEG C | 26.8 | 27.2 | 27.9 | 25.3 | 25.7 | 26.3 | 25.8 |
| Maximum temperature/DEG C | 38.9 | 40.6 | 41.8 | 38.2 | 38.4 | 39.6 | 39.4 |
As can be seen from the above table, it is used alone poly-N-isopropyl acrylamide in comparative example 1, concrete phase poly- N- upon hardening
Ethanol in N-isopropylacrylamide is all separated out, and causes later concrete cooling slow；Poly N-ethylene is used alone in comparative example 2
Base caprolactam, the substantial amounts of heat of accumulation of concrete phase upon hardening, as concrete internal temperature is raised, poly N-vinyl oneself
Lactams largely separates out ethanol, and concrete temperature, which drastically declines, causes inside concrete to shrink comparatively fast.Therefore, comparative example 1 with it is right
The crack for the concrete that ratio 2 is prepared is more than the concrete prepared in embodiment 1.
Sodium alginate is added without in comparative example 3, poly-N-isopropyl acrylamide is with poly-N-vinylcaprolactam to temperature
Susceptibility increase, phase ethanol is all released concrete upon hardening, causes later concrete not cooled, concrete
Internal temperature rise causes temperature difference between inside and outside concrete is larger to cause the crack produced to be more than embodiment 1.Comparative example 4 and comparative example 5
In be separately added into the dispersant of one-component, the simple scattered effect using tetrapropylene benzene sodium sulfonate and sodium cetanesulfonate
Fruit is less than the collective effect of the two, and the crack that concrete is produced is more when being used in conjunction with compared with the two.
Comparative example 6 and the amphoteric polycarboxylate water-reducer that one-component is separately added into comparative example 7, maleic anhydride-ethanol
All there is anion and cation group in amine polycarboxylate water-reducer and acrylic acid-propyl sulfonic acid polycarboxylate water-reducer, compared to reality
Example 1 is applied, it is difficult to adjust that maleic anhydride-monoethanolamine polycarboxylate water-reducer is used alone with acrylic acid-propyl sulfonic acid polycarboxylate water-reducer
Save the ratio of internal anionic and cation group, it is impossible to cement is reached optimal dispersion effect, while ethanol can be influenceed
Precipitation rate.
This specific embodiment is only explanation of the invention, and it is not limitation of the present invention, people in the art
Member can make the modification without creative contribution to the present embodiment as needed after this specification is read, but as long as at this
All protected in the right of invention by Patent Law.
Claims (9)
1. a kind of C30 high performance concretes, it is characterized in that, count by weight, its raw material includes：
2. C30 high performance concretes according to claim 1, it is characterized in that, count by weight, its raw material includes：
3. C30 high performance concretes according to claim 1 or 2, it is characterized in that, the additive is amphoteric polycarboxylic acids
Water reducer, dispersant, sodium alginate, poly- N- alkyl acrylics, ethanol.
4. C30 high performance concretes according to claim 3, it is characterized in that, the amphoteric polycarboxylate water-reducer disperses
Agent, sodium alginate, poly- N- alkyl acrylics, the weight ratio of ethanol is：2.5∶1∶0.5∶1∶2.
5. C30 high performance concretes according to claim 3, it is characterized in that, the poly- N- alkyl acrylamides are poly- N-
The mixture of N-isopropylacrylamide and poly-N-vinylcaprolactam.
6. C30 high performance concretes according to claim 5, it is characterized in that, the poly-N-isopropyl acrylamide and poly-
The weight ratio of N- caprolactams is 1: 2.
7. C30 high performance concretes according to claim 3, it is characterized in that, the amphoteric polycarboxylate water-reducer is horse
Carry out the mixture of acid anhydrides-monoethanolamine polycarboxylate water-reducer and acrylic acid-propyl sulfonic acid polycarboxylate water-reducer.
8. C30 high performance concretes according to claim 3, it is characterized in that, the dispersant is tetrapropylene benzene sulphur
The mixture of sour sodium and sodium cetanesulfonate.
9. a kind of method for preparing C30 high performance concretes as claimed in claim 3, it is characterized in that, comprise the following steps：
S1：Weigh and be stirred in sand, 5-20mm rubbles addition mixer by predetermined weight, mixing time is 10s, is mixed
Thing；
S2：PO42.5 class g cements, high-performance mineral admixture, S95 miberal powders, which are weighed, by predetermined weight adds obtained in S1 mixed
In compound, mixing time is 10s, obtains mixture；
S3：Amphoteric polycarboxylate water-reducer, water are weighed by predetermined weight, after both are mutually mixed, the mixture that S2 is obtained is added
In, mixing time is 60s, obtains mixture；
S4：Poly- N- alkyl acrylamides are weighed by predetermined weight, ethanol is added in pony mixer, stirred while adding sea
Mosanom, stirs 2min, and backward its adds dispersant, continues to stir 1min, obtains mixture；
S5：The mixture that S4 is obtained is added in the mixture that S3 is obtained, and is stirred 30s, is obtained finished product concrete.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103803884A (en) * | 2014-01-20 | 2014-05-21 | 北京奥润开元环保科技研究院有限公司 | C30 regenerated high-performance concrete with low cement content |
| CN105174855A (en) * | 2015-09-01 | 2015-12-23 | 重庆建工住宅建设有限公司 | C30 micro-expansive self-compacting concrete |
-
2017
- 2017-04-13 CN CN201710242973.XA patent/CN106995301B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103803884A (en) * | 2014-01-20 | 2014-05-21 | 北京奥润开元环保科技研究院有限公司 | C30 regenerated high-performance concrete with low cement content |
| CN105174855A (en) * | 2015-09-01 | 2015-12-23 | 重庆建工住宅建设有限公司 | C30 micro-expansive self-compacting concrete |
Non-Patent Citations (1)
| Title |
|---|
| 张晶晶等: "C60 高性能混凝土的研究与施工应用", 《商品混凝土》 * |
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