CN102010147A - Cracking-resisting compacting agent for concrete - Google Patents
Cracking-resisting compacting agent for concrete Download PDFInfo
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- CN102010147A CN102010147A CN201010517355XA CN201010517355A CN102010147A CN 102010147 A CN102010147 A CN 102010147A CN 201010517355X A CN201010517355X A CN 201010517355XA CN 201010517355 A CN201010517355 A CN 201010517355A CN 102010147 A CN102010147 A CN 102010147A
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a cracking-resisting compacting agent for concrete. The cracking-resisting compacting agent comprises siliceous dust, triethanolamine and an air entraining agent, wherein the doping ratio of the siliceous dust to the triethanolamine to the air entraining agent is 1.5 percent: (0.015-0.045 percent): (0.015-0.030 percent). The cracking-resisting compacting agent is well compatible with other additives (such as a water reducing agent); good collapse protecting effect on freshly mixed concrete can be achieved by adding the cracking-resisting compacting agent; the using of the cracking-resisting compacting agent does not influence the strength of the concrete but increases the early strength of the concrete; and the content of internally-doped cracking-resisting compacting agent is low, so that the increase of engineering cost is small. The cracking-resisting compacting agent does not prolong the condensing time of the concrete; and the concrete does not newly produce calcium-containing matters in the early period of hydration when the cracking-resisting compacting agent is doped into the concrete, so that the low carbon development requirement of the concrete is met. The defects in the aspects of durability, energy consumption and environmental friendliness of C3S, C3A and the like are reduced, and the green degree of gelled materials is improved.
Description
Technical field
The present invention relates to the concrete technology field, relate in particular to a kind of concrete anticracking compact agent.
Background technology
At present, the crack to occur be universal phenomenon to high performance concrete.Strict says, fissureless structure does not almost have, but key is how to control harmful crack (Japanese scholar is: outdoorly be subjected to the rainwater effect and when tanning by the sun harmful fissured definition, consider that inner reinforcing bar is subjected under certain situation of corrosive, harmful fracture width of this moment is 0.3mm, and indoor harmful fracture width is more than the 0.6mm.The definition precondition be: the shrinkage cracking with connectivity is an object) appearance.If can not better controlled and prevents that it from will bring huge harm to engineering in harmful crack.Because high performance concrete has the preparation characteristics of high gel material content, low water binder ratio, under the special climate condition, as the few water of arid, strong wind, summer high temperature, winter low temperature, round the clock with the big mal-conditions such as Gobi desert environment of the temperature difference in season under, can accelerate concrete in the sclerosis stage in construction stage and later stage shrinkage strains such as plastic shrinkage, self-constriction, dry shrinkage, temperature contraction take place, these factors will cause the early stage volume stability of concrete poor, very easily produce various cracks.In case generation crack, concrete structure is in the operational phase in later stage, concrete crack has just become the environmental attack medium to invade the passage of inside configuration, will seriously slacken the weather resistance of concrete structure, makes concrete structure can't satisfy the work-ing life of design period.Therefore, how guaranteeing that high performance concrete does not produce cracking in the operational phase in construction stage, sclerosis stage and later stage, guarantee the weather resistance of concrete structure, is one of difficult problem of facing of current high performance concrete.Research and analyse and show: high performance concrete rimose type is mainly chemical shrinkage cracking, plastic shrinkage cracking, self-constriction cracking, dry shrinkage cracking, temperature shrinkage cracking, the carbonization cracking etc. that shrinks, endures cold in early days.
Under the special climate envrionment conditions, how to improve concrete workability, make that concrete pumpability in construction is strong, good stability, denseness are suitable etc.Though through a large amount of engineering practice, rich experience has been arranged in this respect, under special environmental conditions, how satisfy construction requirement under adverse weather condition by optimizing adulterant, become urgent problem.The requirement of the splitting resistance of high performance concrete, frost resistance in addition is starved of concrete admixture is optimized research, to satisfy engineering construction, design, service requirements.
Many significant explorations have been done at concrete cracking and the Chinese scholars such as workability, weather resistance that improve high performance concrete, as economization agent for concrete, concrete anticracking, impervious reinforcing agent, the super plasticizing of JY-HR type composite water-proof agent, HEA anti-crack water-proof agent for concrete etc., important effect has been brought into play in these significant research and inventions in different concrete workses.But when the newly-built Lan-xing Railway second two-wire, because special climate condition: the big temperature difference, arid, lack of water etc., this harsh climate condition has proposed new test to high performance concrete, how to prevent and control concrete cracking, how to improve the workability of concrete self, how to satisfy the high performance concrete high performance requirements and become a new difficult problem, under this condition, the present invention is according to a large amount of theoretical analysises, shop experiment research, outdoor checking, confirmation cracking resistance compact agent can effectively be controlled concrete cracking, improve its workability, make durability index raisings such as concrete impermeability.
Prior art one: economization agent for concrete: adopt the polycarboxylic acid series preparation of raw material, can not produce negatively influencing to drying shrinkage on the coagulation.From microcosmic angle as can be known economization agent concrete shrinkage is had restraining effect, the result shows: mix an amount of economization agent and can improve concrete contraction situation largely, dominant mechanism be economization agent improve aggregate and cement stone in the concrete combine the contraction of contained expansion component compensating concrete.As shown in Table 1 and Table 2:
The part kind of table 1 economization agent
| No? | Chemical constitution | Explanation |
| 1? | HO(C 3H 6O) 4H | Polytrimethylene glycol |
| 2? | CH 3O(C 2H 4O) 3H | Oxyethane methyl alcohol annexation |
| 3? | C 2H 5O(C 2H 4O) 4(C 3H 6O) 4H | Oxyethane propylene oxide block polymkeric substance |
| 4? | H(C 2H 4O) 15(C 3H 6O) 5H | The oxyethane propylene oxide is with organic polymer |
| 5? | HO(C 2H 4O) 4H | Oxyethane cycloalkyl annexation |
| 6? | CH 3O(C 2H 4O)CH 3 | Oxyethane methyl annexation |
| 7? | O(C 2H 4O) 2H | Oxyethane phenyl annexation |
| 8? | CH 3O(C 2H 4O) 2(C 3H 6O) 6H | Oxyethane propylene oxide block polymkeric substance aminomethyl phenyl annexation |
| 9? | [CH 3O(C 2H 4O) 2] 2CH 2 | Two ends additional ring oxidative ethane methyl alcohol |
[0008]?
| 10? | (CH 3) 2N(C 2H 4O) 3H | Oxyethane dimethylin annexation |
The Partial Physical Property of table 2 economization agent
There is following shortcoming in prior art one:
1, economization agent and other admixture (as water reducer) consistency are relatively poor, and the final effect after the use makes the performance separately of original two kinds of admixtures all be subjected to failing to some extent;
2, after economization agent, polycarboxylate water-reducer, sodium sulfate mix, may make slump-loss excessive using, not match with other admixture sometimes based on the economization agent of alcohol ether;
3, the use of economization agent will cause concrete strength to reduce, and each age concrete intensity is along with the increase of volume when using economization agent separately, and fall will reach more than 10%:
4, mix economization agent in and exist volume big, increase engineering cost.
Prior art two: concrete anticracking, impervious reinforcing agent, fresh concrete is had the good guarantor effect of collapsing, do not have slump-loss behind the concrete mixing in 2 hours substantially, and be acted upon by temperature changes hardly.The volume of concrete distortion is little.Mix 6～8% concrete anticracking, impervious reinforcing agent in the concrete, it has the microdilatancy characteristic in early days, and the 28d concrete does not have contraction substantially.Crack resistance is strong.
On the one hand, the efficient water reducing ability of JM-III modified version toughener makes the concrete W/C of high flowability drop to about 0.30, thereby reduces effectively to shrink; On the other hand, the hydration of JM-III modified version toughener makes concrete produce a large amount of ettringite in early days, and concrete produces little swollen account, thereby has compensated concrete contraction.Experiment showed, to be mixed with the follow-on concrete of JM-III, 28d does not have contraction substantially, and the shrinking percentage of 42d only has 1.2 * 10
-4, cause the deformation values of concrete cracking much smaller than meeting.
1, the slow setting time long, should not be applied in the demanding concrete works of early strength, the slow setting time is long for the special climate area, brings difficulty to maintenance etc.;
Can make concrete at a large amount of ettringite of the early stage generation of hydration when 2, mixing concrete anticracking, impervious reinforcing agent in the concrete, this does not meet concrete low carbon development.There is C
3S and C
3Defective aspect weather resistance, energy consumption and environmental protection such as A, the greenness of shortage gelling material.
Summary of the invention
Technical problem to be solved by this invention is at the deficiencies in the prior art, and a kind of concrete anticracking compact agent is provided.
The present invention adopts following technical scheme:
A kind of concrete anticracking compact agent comprises silicon ash, trolamine, air entrapment agent.
Described concrete anticracking compact agent, silicon ash, trolamine, the air entrapment agent addition ratio in concrete is: silicon ash: trolamine: air entrapment agent=1.5%: (0.015%-0.045%): (0.015%-0.030%).
The usage of described concrete anticracking compact agent is mixed described silicon ash, trolamine, air entrapment agent in the concrete.
The usage of described concrete anticracking compact agent, silicon ash, trolamine, the air entrapment agent addition ratio in concrete is: silicon ash: trolamine: air entrapment agent=1.5%: (0.015%-0.045%): (0.015%-0.030%).
The cracking resistance compact agent is the compound additive that is composited by multiple organic and inorganic materials.By filling effect, volcanic ash effect, the super synergistic effect of compoundization, surfactivity effect, make and formed rational hole grating in the concrete, can reduce surface tension, the concrete various stress of buffering of solid-liquid phase in the concrete, improve concrete density, improve the workability of concrete mix; Can effectively reduce the capillary porosity duct that is communicated with in the concrete, improve concrete impermeability.Add the cracking resistance compact agent in the concrete and can not only make concrete intensity steady-state growth, compactness, erosion resistance etc. significantly improves, and can effectively prevent and suppress crack on concrete.
Beneficial effect: 1, cracking resistance compact agent and other admixture (as water reducer) consistency are better;
2, add the cracking resistance compact agent fresh concrete is had the good guarantor effect of collapsing;
3, the use of cracking resistance compact agent does not influence concrete strength, and can increase concrete early strength;
4, it is little to mix cracking resistance compact agent volume in, and engineering cost increases little.
5, the cracking resistance compact agent can not delay concrete coagulating time;
Can not make concrete at the early stage new material that contains calcium that produces of hydration when 6, mixing the cracking resistance compact agent in the concrete, meet concrete low carbon development.Reduce the defectives aspect weather resistance, energy consumption and environmental protection such as C3S and C3A, improve the greenness of gelling material.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
Embodiment 1
(1) purpose: prepared L (beam) type, D (pier) type and Z (stake) type concrete that concrete is mixed the cracking resistance compact agent, and made intensity, the chloride-penetration resistance test specimen has carried out maintenance under standard conditions, tested the intensity level of 7d, 28d and 56d and the displacement flux of 28d and 56d respectively; And test-results and the concrete of not mixing after the optimization of concrete anticracking compact agent compared, analyze of the influence of cracking resistance compact agent to concrete strength, density and splitting resistance.
(2) scheme: test used material technology index and see Table 3～table 7, mix in L type, D type and the Z type concrete mix employing table 8 of cracking resistance compact agent in LYC, the table 9 table ZYC proportioning among the DYC and table 10, the volume of concrete anticracking compact agent is 1.5%.
The physical and mechanical property index of table 3 cement
The main performance index of table 4 slag and flyash
Table 5 polycarboxylate water-reducer main performance index value
The main performance index value of table 6 rubble
The main performance index of table 7 sand
Table 8 water-cement ratio is 0.30 mix proportion parameter (a L type concrete)
| Project | JC? | LFC? | LKC? | LYC? |
| Water-cement ratio | 0.30? | 0.30? | 0.30? | 0.30? |
| Unit consumption of water/(kg/m3) | 145? | 145? | 145? | 145? |
| Sand coarse aggregate ratio/% | 40? | 40? | 40? | 40? |
| Sand consumption/kg | 717? | 717? | 717? | 717? |
| Stone consumption/kg | 1075? | 1075? | 1075? | 1075? |
| High efficiency water reducing agent volume/% | 1.6? | 1.4? | 1.2? | 1.3? |
Table 9 water-cement ratio is 0.34 mix proportion parameter (a D type concrete)
| Project | JC? | DFC? | DKC? | DYC? |
| Water-cement ratio | 0.34? | 0.34? | 0.34? | 0.34? |
| Unit consumption of water/(kg/m3) | 145? | 145? | 145? | 145? |
| Sand coarse aggregate ratio/% | 42? | 42? | 42? | 42? |
| Sand consumption/kg | 768? | 768? | 768? | 768? |
| Stone consumption/kg | 1061? | 1061? | 1061? | 1061? |
| High efficiency water reducing agent volume/% | 1.7? | 1.5? | 1.4? | 1.4? |
Table 10 water-cement ratio is 0.38 mix proportion parameter (a Z type concrete)
| Project | JC? | ZFC? | ZKC? | ZYC? |
| Water-cement ratio | 0.38? | 0.38? | 0.38? | 0.38? |
| Unit consumption of water/(kg/m3) | 145? | 145? | 145? | 145? |
[0057]?
| Sand coarse aggregate ratio/% | 44? | 44? | 44? | 44? |
| Sand consumption/kg | 815? | 815? | 815? | 815? |
| Stone consumption/kg | 1038? | 1038? | 1038? | 1038? |
| High efficiency water reducing agent volume/% | 1.8? | 1.5? | 1.4? | 1.4? |
Wherein JC represents normal concrete: the FC representative is the concrete of main adulterant with flyash; The KC representative is the coagulation ten of main adulterant with breeze; YC represents the concrete after fly ash, breeze are optimized, and L represents the beam body concrete, and D represents the pier concrete, and Z represents the pile foundation concrete.
(3) test-results
1) intensity and displacement flux test-results
One) L type concrete strength and displacement flux test-results
Table 11 is difference L type concrete strength in the length of time and displacement flux test value, and wherein ZLYC represents the optimization L type concrete of admixture concrete anticracking compact agent.
Table 11 L type concrete strength in the different length of time and displacement flux test value
| Project | LYC? | ZLYC? |
| 7d intensity/MPa | 37.2? | 40.2? |
| 28d intensity/MPa | 57.5? | 62.3? |
| 56d intensity/MPa | 64.2? | 68.9? |
| 28d displacement flux/C | 1096? | 990? |
| 56d displacement flux/C | 694? | 635? |
Two) D type concrete strength and displacement flux test-results
Table 12 is difference D type concrete strength in the length of time and displacement flux test value, and wherein DLYC represents the optimization D type concrete of admixture concrete anticracking compact agent.
Table 12 D type concrete strength in the different length of time and displacement flux test value
| Project | DYC? | DLYC? |
[0069]?
| 7d intensity/MPa | 33.2? | 35.8? |
| 28d intensity/MPa | 48.6? | 52.3? |
| 56d intensity/MPa | 57.8? | 63.5? |
| 28d displacement flux/C | 1120? | 1103? |
| 56d displacement flux/C | 783? | 732? |
Three) Z type concrete strength and displacement flux test-results
Table 13 is difference Z type concrete strength in the length of time and displacement flux test value, and wherein ZZYC represents the optimization Z type concrete of admixture concrete anticracking compact agent.
Table 13 Z type concrete strength in the different length of time and displacement flux test value
| Project | ZYC? | ZZYC? |
| 7d intensity/MPa | 30.1? | 33.4? |
| 28d intensity/MPa | 44.0? | 47.8? |
| 56d intensity/MPa | 50.1? | 53.9? |
| 28d displacement flux/C | 1230? | 1035? |
| 56d displacement flux/C | 820? | 761? |
(4) cracking test result
1) mixes the L type concrete anticracking test-results of cracking resistance compact agent
Table 14 be admixture concrete anticracking compact agent and not the L type mineral admixture of admixture concrete anticracking compact agent optimize the distress in concrete development condition.
Table 14 Different L type is optimized the contrast of concrete crack
2) mix the D type concrete anticracking test-results of cracking resistance compact agent
Table 15 be admixture concrete anticracking compact agent and not the D type mineral admixture of admixture concrete anticracking compact agent optimize the distress in concrete development condition.
The different D types of table 15 are optimized the contrast of concrete crack
3) mix the Z type concrete anticracking test-results of cracking resistance compact agent
Table 16 be admixture concrete anticracking compact agent and not the Z type mineral admixture of admixture concrete anticracking compact agent optimize the distress in concrete development condition.
The different Z types of table 16 are optimized the contrast of concrete crack
(5) conclusion
The concrete ratio of admixture concrete anticracking compact agent not each age strength of concrete of admixture concrete anticracking compact agent is improved, increase rate about 10%, displacement flux all decreases, the reduction amplitude is 10%, this mainly is because the cracking resistance compact agent contains thinner grain fraction, because these fine grain micro aggregates effects, make the inside concrete that mixes the cracking resistance compact agent more closely knit, so its intensity and resistance of chloride ion penetration are greatly improved.
(6) main component of cracking resistance compact agent is: silicon ash, trolamine, air entrapment agent.
Below list the technical requirements of three kinds of composition materials when combination:
The technical requirements of silicon ash
| Sequence number | Test item | Technical indicator |
| 1? | Specific surface area | ≥18000m 2/kg |
| 2? | Cl-? | ≤0.02％? |
| 3? | SiO2 content | ≥90％? |
| 4? | The 28d activity index | ≥85％? |
| 5? | Loss on ignition | ≤6％? |
| 6? | Water ratio | ≤3.0％? |
| 7? | Water requirement | ≤125％? |
| 8? | Median size | ＜0.1μm? |
The technical requirements of trolamine: effective constituent reaches more than 95%;
The technical requirements of air entrapment agent
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.
Claims (4)
1. a concrete anticracking compact agent is characterized in that, comprises silicon ash, trolamine, air entrapment agent.
2. concrete anticracking compact agent according to claim 1, it is characterized in that silicon ash, trolamine, the air entrapment agent addition ratio in concrete is: silicon ash: trolamine: air entrapment agent=1.5%: (0.015%～0.045%): (0.015%～0.030%).
3. the usage of the described concrete anticracking compact agent of claim 1 is characterized in that, described silicon ash, trolamine, air entrapment agent are mixed in the concrete.
4. the usage of concrete anticracking compact agent according to claim 2, it is characterized in that silicon ash, trolamine, the air entrapment agent addition ratio in concrete is: silicon ash: trolamine: air entrapment agent=1.5%: (0.015%～0.045%): (0.015%～0.030%).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102320774A (en) * | 2011-07-19 | 2012-01-18 | 孙建志 | Anticorrosive, antirust, anti-seepage and anti-cracking composite additive special for concrete |
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| CN101168480A (en) * | 2006-10-23 | 2008-04-30 | 浙江合力新型建材有限公司 | High-performance concrete corrosion-resistant anti-cracking agent and producing method thereof |
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| US5112405A (en) * | 1989-01-24 | 1992-05-12 | Sanchez Michael A | Lightweight concrete building product |
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| CN1792982A (en) * | 2005-11-25 | 2006-06-28 | 华南理工大学 | Silicate cement of precenting chlorate corrosion |
| CN101168480A (en) * | 2006-10-23 | 2008-04-30 | 浙江合力新型建材有限公司 | High-performance concrete corrosion-resistant anti-cracking agent and producing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102320774A (en) * | 2011-07-19 | 2012-01-18 | 孙建志 | Anticorrosive, antirust, anti-seepage and anti-cracking composite additive special for concrete |
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Application publication date: 20110413 |