CN110054456A - A kind of cement base surface material with high-temperature damage self-repair function - Google Patents
A kind of cement base surface material with high-temperature damage self-repair function Download PDFInfo
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- CN110054456A CN110054456A CN201910347587.6A CN201910347587A CN110054456A CN 110054456 A CN110054456 A CN 110054456A CN 201910347587 A CN201910347587 A CN 201910347587A CN 110054456 A CN110054456 A CN 110054456A
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- Prior art keywords
- cement
- calcium carbonate
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- aggregate
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/26—Carbonates
- C04B14/28—Carbonates of calcium
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/383—Whiskers
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention relates to building material technical fields, and in particular to a kind of cement base surface material with high-temperature damage self-repair function.It is characterized by: mainly including micron-sized calcium carbonate crystal whisker, nanometer calcium carbonate, cement slurry and aggregate；Wherein the mass ratio of both calcium carbonate crystal whisker and nanometer calcium carbonate is 1:1~5；Cement slurry is made of cement, admixture, water and water-reducing agent；Maximum aggregate size is 2mm；Mass ratio between cement, micro-nano calcium carbonate, aggregate, admixture, water and water-reducing agent is 1:0.1~0.3:0~1:0.1~0.4:0.36~0.7:0.004~0.009, and water-reducing agent can also require appropriate addition according to the application property of mixture.Cement-base composite material of the invention due to joined micro-nano calcium carbonate have resistance well split and high temperature it is impaired after self-repair function, while the aesthetics of cement matrix surface material can be improved.Therefore, there is good market popularization value.
Description
Technical field
The invention belongs to building material technical fields, are related to a kind of cement foundation base with high-temperature damage self-repair function
Material.
Background technique
Currently, some nano materials, such as: nano silica, nano-titanium dioxide, nano zirconium dioxide, nano-sized carbon
Sour calcium, graphene and carbon nanotube etc. are used as reinforcing material and are added in cement matrix.These nano materials can pass through
Microcosmic modification and humidification improve the macro property of cement-based material.But the cost of the above nano material is higher, hinders
Its popularization in engineer application.In contrast, nanometer calcium carbonate cost is minimum and raw material sources are extensive, has higher sexual valence
Than, be it is current it is most potential can nano material of the large-scale application in cement-based material.
Fire belongs to high frequency disaster and very disruptive, especially for high-rise, super high rise building and deep big underground
Buildings or structures, fire often result in huge economic loss and casualties.Fire often results in construction material
The sharply deterioration of energy, the buildings or structures surface layer especially directly contacted with open fire.Repair after the calamity of buildings or structures needs
A series of complex and the cumbersome processes such as impaired detection, security evaluation and recovery scenario formulation are undergone, this will put into largely
Time and manpower and material resources；And the repair process after calamity often occupies a large amount of place space, to people's lives and production band
It is inconvenient to come.Similarly, the special buildings or structures being chronically in hot environment also face the danger of its construction material performance deterioration
Evil, such as: steel-making workshop, boiler room, brickkiln, chimney etc..For common buildings or structures, these special build (structures) are built
It is longer scarce often to there is higher constructional difficulties, construction risk, construction poor operability and duration in the repair of object plane layer
Point.In addition, usually requiring to be completed by special work post for the patch work of special buildings or structures, it will increase some volumes
Outer operating cost, higher cost.
Summary of the invention
For overcome the deficiencies in the prior art, the invention proposes a kind of cement bases with high-temperature damage self-repair function
Surface material can not only realize the selfreparing in situ of cement foundation base after high temperature is impaired, also have both high temperature resistant, low cost and good
The characteristics of good decorative effect.
The present invention adopts the following technical scheme:
A kind of cement-base composite material with high-temperature damage self-repair function, including micro-nano calcium carbonate, cement slurry
And aggregate；The micro-nano calcium carbonate includes micron-sized calcium carbonate crystal whisker and nano-calcium carbonate particles；Wherein calcium carbonate is brilliant
Must be raphioid fiber, 20 μm -30 μm of length, 0.5 μm -2 μm of diameter, draw ratio 10-60；Nanometer calcium carbonate partial size is 10nm-
100nm；Mass ratio between the two is 1:1~5；The cement slurry is made of cement, admixture and water；The aggregate is most
Big partial size is 2mm.Cement, micro-nano calcium carbonate, aggregate, admixture and water mass ratio be 1:0.1~0.3:0~1:0.1~
0.4:0.36~0.7；Water-reducing agent can require appropriate addition according to the application property of mixture.
The cement is common portland cement.
The admixture is level-one flyash.
The aggregate is fine aggregate.
The water-reducing agent is high efficiency water reducing agent.
The above-mentioned cement base surface material preparation method with high-temperature damage self-repair function, comprising the following steps:
(1) by after raw material proportioning, micro-nano calcium carbonate is added in the mixed solution of 1/2 water-reducing agent and 1/2 water, is quickly stirred
120s is mixed, keeps micro-nano calcium carbonate evenly dispersed in the aqueous solution of water-reducing agent；
(2) above-mentioned micro-nano calcium carbonate suspension ultrasonic treatment is carried out using ultrasonic equipment to be not less than after 6h for use；
(3) agitated kettle, uniform stirring 60s is added in common portland cement, aggregate and admixture；
(4) mixed solution of remaining 1/2 water-reducing agent and 1/2 water is added in above-mentioned dry mix, is mixed slowly
120s；
(5) continue to mix slowly 60s, during which the micro-nano calcium carbonate suspension after ultrasonic treatment is divided 2~3 times and is added to
In cement mortar；
(6) last quickly stirring 120s, pouring molding, is suitably conserved later, obtains self-repair function after having high temperature
Micro-nano calcium carbonate enhance cement base surface material.
Micron-sized calcium carbonate crystal whisker and nano-calcium carbonate particles are added in cement matrix, can not only play two jointly
Filling effect of the person on different scale, the two can also play respective advantage respectively.On the one hand, the highly resistance of calcium carbonate crystal whisker
Tensile strength, high elastic modulus and microfibre can be played the role of in cement matrix compared with big L/D ratio, by whiosker pullout,
Three kinds of main mechanisms of crack deflection and crackle bridging effectively inhibit the generation of microcrack in cement matrix, realize to cement
The activeness and quietness of matrix.On the other hand, nanometer calcium carbonate have nucleation, can make hydrated calcium silicate (C-S-H) gel and
The hydrated products such as calcium hydroxide (CH) are grown on its surface, therefore accelerate Silicon in Cement acid tricalcium (C3S hydration rate), contracting
Short C3The induction period of S aquation；Meanwhile the presence of nanometer calcium carbonate, C-S-H gel can be increased in Behavior of Hardened Cement Paste-aggregate interface
Content, improve aligning for wherein CH, optimize interface performance；Secondly, nanometer calcium carbonate can be with the aluminium phase in cement
Reaction forms carboaluminates, increases the volume of hydrated product, while entringite (AFt) being inhibited to convert to single sulfur type product (AFm),
To significantly improve the mechanical property of cement base surface material.
Under high temperature action, at 400 DEG C -600 DEG C crystal transfer can occur for micro-nano calcium carbonate, be transformed into surely by aragonite
Fixed calcite improves the mechanical property of cement matrix after high temperature to improve its combination degree with cement mortar matrix.When
Temperature reaches 800 DEG C, and almost all of hydrated product has all decomposed in cement matrix, therefore the performance of cement-base composite material is anxious
Play deterioration.At this point, conserving again to the cement base surface material progress water drenching after impaired, it is damaged micro-nano calcium carbonate high temperature in surface layer
Normal hydrolysis product of cement can be formed with flyash therein generation pozzolanic reaction by decomposing the calcium oxide generated, while can be had
Effect alleviates volume expansion caused by calcium oxide rehydration.Also, flyash gelling through high-temperature activation is promoted, then while conserving is raw
At a large amount of C-S-H gel, the fault of construction generated in surface layer by high temperature action can be repaired, the microcosmic of cement base surface material is made
Structure, macro property and durability are restored, and reparation degree is obviously improved compared with ordinary cement based composites.
In addition, the plumpness, finish and durability of cement foundation base also can be improved in the addition of micro-nano calcium carbonate.Cause
This, the super high rise building, deep big underground buildings or structures and high temperature resistant that can be applied to higher fire protection requirement are built (structure) and are built
The surface layer structure of object.Meanwhile the raw material sources of micro-nano calcium carbonate are extensive, can be the extensive of China's calcium carbonate mineral resources
Open up new approach.
Detailed description of the invention
Fig. 1 is the heating schedule of sample in case study on implementation 1；
Fig. 2 is 800 DEG C of high temperature front and back in case study on implementation 1 and conserves samples pictures again；
Wherein: (a) sample before high-temperature process (AT)；(b) sample after high-temperature process (AE)；
(c) sample (AR) conserved again after high temperature.
Fig. 3 is 1 high temperature of case study on implementation front and back and conserves sample flexural strength result again.
Fig. 4 is 1 high temperature of case study on implementation front and back and conserves sample compression strength result again.
Specific embodiment
Illustrate the embodiment of the present invention with reference to the accompanying drawings and examples.
[embodiment 1]
The present invention uses the weight proportion component of raw material are as follows: 5 parts of micro-nano calcium carbonate, 50 parts of common portland cements, 5
Part admixture, 24 parts of water and 0.2 part of water-reducing agent.Firstly, 5 parts of micro-nano calcium carbonate are added to 12 parts of water and 0.1 part of diminishing
In the uniform mixed liquor of agent, quickly stirring 120s keeps micro-nano calcium carbonate evenly dispersed；It then, will be above-mentioned using ultrasonic equipment
It is stand-by after micro-nano calcium carbonate suspension ultrasonic treatment 8h；Agitated kettle is added in the common portland cement of weighing and admixture,
Uniform stirring 60s；And then the uniform mixed liquor of remaining 12 parts of water and 0.1 part of water-reducing agent is added to above-mentioned dry mix
In, mix slowly 120s；Continue to mix slowly 60s, is during which added three times the micro-nano calcium carbonate suspension after ultrasonic treatment
Into cement mixing material, 120s, the test sample of last pouring molding 40mm × 40mm × 160mm are quickly stirred later；In temperature
20 DEG C ± 1 DEG C is spent, maintenance obtained the micro-nano with high-temperature damage self-repair function to 28 days in 95% environment above of relative humidity
Rice calcium carbonate enhances cement base surface material.
Similarly, according to above-mentioned whipping procedure, the test specimen that identical quantity does not add nanometer calcium carbonate is prepared, as a comparison sample
This.
Above-mentioned sample is put into high temperature furnace, carries out high-temperature process according to heating schedule as shown in Figure 1.High-temperature process
Sample takes out from high temperature furnace after being cooled to room temperature, and carries out water drenching and conserves again.
Conserve exterior appearance such as Fig. 2 of (AR) sample before high-temperature process after (AT), high-temperature process after (AE), high-temperature process again
It is shown.AT compared to Fig. 2 (a), it can be clearly seen that serious deterioration occurs in the AE sample surface of Fig. 2 (b), is covered with netted split
Seam.The AR sample surface crack of Fig. 2 (c) is reduced after water drenching conserves again, illustrates sample through structure caused by high temperature action
Deterioration is alleviated.
According to the regulation of GB/T 17671, supported again after (AE), high-temperature process after (AT), high-temperature process before test high-temperature process
The flexural strength and compression strength of (AR) sample are protected, test result is as shown in Figure 3 and Figure 4.As can be seen that relative to AE, AR sample
This flexural strength and compression strength obtains promotion largely, which has fully demonstrated the cement foundation base
Intensity self-repair function of the material after undergoing high-temperature damage.
Cement-base composite material of the invention due to joined micro-nano calcium carbonate have well resistance split and high temperature by
Self-repair function after damage, while the aesthetics of cement matrix surface material can be improved.Therefore, there are good market prospects.
Claims (6)
1. a kind of cement base surface material with high-temperature damage self-repair function, feature is in including micro-nano calcium carbonate, water
Slurry body and aggregate；The micro-nano calcium carbonate includes micron-sized calcium carbonate crystal whisker and nano-calcium carbonate particles；Wherein carbon
Sour calcium pyroborate be raphioid fiber, 20 μm -30 μm of length, 0.5 μm -2 μm of diameter, draw ratio 10-60；Nano-calcium carbonate particles it is straight
Diameter is 10nm-100nm；Mass ratio between the two is 1:1~5；The cement slurry is made of cement, admixture, water；Institute
Stating maximum aggregate size is 2mm；Cement, micro-nano calcium carbonate, aggregate, admixture, the mass ratio between water are 1:0.1~0.3:
0~1:0.1~0.4:0.36~0.7.
2. a kind of cement base surface material with high-temperature damage self-repair function according to claim 1, feature exist
In the cement is common portland cement.
3. a kind of cement base surface material with high-temperature damage self-repair function according to claim 1 or 2, feature
It is, the admixture is level-one flyash.
4. a kind of cement base surface material with high-temperature damage self-repair function according to claim 1 or 2, feature
It is, the aggregate is fine aggregate.
5. a kind of cement base surface material with high-temperature damage self-repair function according to claim 3, feature exist
In the aggregate is fine aggregate.
6. a kind of any cement-base composite material preparation side with high-temperature damage self-repair function claim 1-5
Method, it is characterised in that the following steps are included:
(1) by after raw material proportioning, micro-nano calcium carbonate is added in the mixed solution of 1/2 water-reducing agent and 1/2 water, is quickly stirred
120s keeps micro-nano calcium carbonate evenly dispersed in the aqueous solution of water-reducing agent；
(2) above-mentioned micro-nano calcium carbonate suspension ultrasonic treatment is carried out using ultrasonic equipment to be not less than after 6h for use；
(3) agitated kettle, uniform stirring 60s is added in common portland cement, aggregate and admixture；
(4) mixed solution of remaining 1/2 water-reducing agent and 1/2 water is added in above-mentioned dry mix, mixes slowly 120s；
(5) continue to mix slowly 60s, during which the micro-nano calcium carbonate suspension after ultrasonic treatment is divided 2~3 times and is added to cement
In mortar；
(6) last quickly stirring 120s, pouring molding, is suitably conserved later, and obtaining has high-temperature damage self-repair function
Micro-nano calcium carbonate enhances cement base surface material.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113024217A (en) * | 2021-04-09 | 2021-06-25 | 嘉华特种水泥股份有限公司 | Self-repairing cement for heat damage tunnel |
| CN113620674A (en) * | 2021-09-10 | 2021-11-09 | 中南林业科技大学 | Green and economical high-ductility cement-based composite material and preparation method thereof |
| CN114988737A (en) * | 2022-06-02 | 2022-09-02 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Composite material for improving crack resistance of concrete and preparation method and application thereof |
| CN115594467A (en) * | 2022-11-21 | 2023-01-13 | 湖南大学（Cn） | Self-leveling self-compacting wear-resistant floor material and preparation method thereof |
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Application publication date: 20190726 |