CN105863147B - A kind of nano modification high durability concrete material and preparation method thereof - Google Patents
A kind of nano modification high durability concrete material and preparation method thereof Download PDFInfo
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- CN105863147B CN105863147B CN201610200387.4A CN201610200387A CN105863147B CN 105863147 B CN105863147 B CN 105863147B CN 201610200387 A CN201610200387 A CN 201610200387A CN 105863147 B CN105863147 B CN 105863147B
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C1/00—Building elements of block or other shape for the construction of parts of buildings
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/16—Structures made from masses, e.g. of concrete, cast or similarly formed in situ with or without making use of additional elements, such as permanent forms, substructures to be coated with load-bearing material
Abstract
The invention discloses a kind of nano modification high durability concrete materials and preparation method thereof, belong to architecture engineering material technical field.The concrete material of the present invention includes high-densit concrete cover A, normal concrete layer B and normal concrete dabbing process layer C；The high-densit concrete cover A is located at the top of normal concrete layer B；The normal concrete dabbing process layer C is between high-densit concrete cover A and normal concrete layer B.The present invention carries out hierarchical design on the basis of traditional normal concrete, to concrete, realizes that material system is uniform excessive in performance, and then constitute the concrete structure of endurance enhancing, to realize structure-function integration.The design of the protective layer structure can both resist the erosion of external environment harmful substance, can also reduce the huge waste on the material property and cost brought due to preparing high-performance homogenization structural material.
Description
Technical field
The present invention relates to a kind of construction material more particularly to a kind of nano modified concrete material that durability is fabulous and its
Preparation method.
Background technology
Cement material is that current purposes is most wide, the maximum cementitious material of dosage, and being played in infrastructure construction can not
The effect of replacement, China's cement output is larger, and in the past 10 years, China's cement output accounts for about the 60% of world's cement total output.With
National basis facility closely puts into increase, higher and higher with the demand of cement, concrete, and especially key project is to the durability long-life
Demand increasingly increase.At the same time, due to the influence of environment, every year because the deterioration of cement-based material performance results in huge warp
Ji loss and the wasting of resources, and endurance issues cause a hidden trouble to the safety of structure, therefore improve the durable of cement-based material
Property is of great significance.
The durability of cement-based material is by physical action（Frozen-thawed cycled, alternation of wetting and drying and temperature change etc.）Make with chemistry
With（The carbonization of surrounding medium burn into, alkali-aggregate reaction, steel bar corrosion etc.）Combined influence, be substantially due to cement matrix
The structural homogeneity difference and compactness of material are low.It therefore, be to the closely knit processing of the structure of cement-based material, so as to improve cement matrix
The durability of material.
The modified concrete of hypotonicity is studied, it is an effective and feasible method to be modified using nano material, closely
Nian Lai, nano modified concrete are widely used, and achieve good effect.Such as yellow work(, Xie little Peng is in text
It offers《Nano-meter SiO_22Experimental study is influenced on hydroconcrete durability》In describe the preparation process of nano modified concrete, and
It was found that proper amount of nano silica is added in concrete for hydraulic structure can improve concrete microcellular structure, the hole in blocking concrete
Gap improves the compaction rate of concrete, enhances impervious, freeze proof, the chemical resistance of concrete ability of concrete, to improve water conservancy project coagulation
The durability of soil.Saloma is in document《Improvement of Concrete Durability by Nanomaterials》
In describe the preparation process of nano-silicon dioxide modified cement-based material in detail, mix nanometer in concurrent cement-based material now
Silica will effectively improve the freezing and thawing performance of cement-based material.Although in above-mentioned hypotonicity concrete preparation process
Nano modification cement-based material can promote materials ' durability, but because the whole cost mistake for leading to finished product using nano material
It is high, it is difficult to realize engineer application.
In general, the damage of cement-based material performance pernicious gas in by environment, liquid medium is influenced to be from outward appearance to inner essence
Process, the partial degradation contacted with environment is fast, and internal structure change is slow, so as to cause structural behaviour variation in apparent ladder
Spend distribution characteristics.Therefore, the performance on cement-based material surface layer is improved, the compactness extent of surface layer cement-based material is especially improved,
There is remarkable effect to improving structure entirety resistance against environmental influences.
In recent years, the application of concrete cover is increasingly paid attention to by numerous researchers, in order to improve cement base
The surface performance of material coats organic and inorganic protective materials frequently on its surface, and the weatherability of organic protection coating is poor, protects
Sheath is easy to fall off；Inorganic protective layer has higher dependence, alkali metal ion contained therein that can increase material property environment
The risk of deterioration.Such as king letter just, Ma Baoguo, Chen Li and《The ion transmission performance and microstructure of gradient-structure concrete》
In devise 2 kinds of high-impermeables protective layer material LPC and MIF, and carry out experimental study.The experimental results showed that using protective layer structure
HPC endurance qualities promoted, but promote effect unobvious, and without research shows that MIF has with LPC and normal concrete
Preferable cooperative work performance.
Invention content
For problems of the prior art, the present invention provides a kind of nano modification high durability concrete materials.
For the concrete material on the basis of traditional normal concrete, the part material for keeping structure different using gradient-structure has difference
Major function, to realize structure-function integration.The design of the gradient-structure can both resist external environment harmful substance
It corrodes, the huge wave on the material property and cost brought due to preparing high-performance homogenization structural material can also be reduced
Take.
The present invention also provides the preparation methods of above-mentioned concrete material.
The present invention uses following technical scheme：
A kind of nano modification high durability concrete material, which is characterized in that it include high-densit concrete cover A,
Normal concrete layer B and normal concrete dabbing process layer C；The high-densit concrete cover A is located at normal concrete layer B
Top；The normal concrete dabbing process layer C is between high-densit concrete cover A and normal concrete layer B；Institute
It states B layers of normal concrete to be made of C40 concrete materials, material mixture ratio is：Water 8.3%, cement 20.4%, sand 24.3%, stone
47.0%；
The high-densit concrete cover A is made of the raw material of following weight percent：Cement 20.63 ~ 20.75%,
Flyash 5.25 ~ 5.28%, slag 7.51 ~ 7.55%, silicon ash 4.13 ~ 4.15%, nano silicon dioxide 0.38% ~ 0.75%, sand
52.53% ~ 52.83%, water-reducing agent 0.75% ~ 0.94%, water 8.26 ~ 8.31%.
Preferably, the thickness of the high-densit concrete cover A is 5mm-15mm.
Preferably, the nano silicon dioxide is Aladdin hydrophilic meteorology Nano-meter SiO_22, grain size 7-40nm, average grain
Diameter 25nm.
A kind of preparation method of above-mentioned nano modification high durability concrete material, it includes the following steps：
（1）It is spare that water, cement, sand, stone according to weight proportion are mixed and made into normal concrete slurry；
（2）Cement, flyash, slag, silicon ash, nano silicon dioxide, sand are added to blender stirring according to proportioning
Dry mixing 3min in bucket, makes each basis material be uniformly dispersed, then is stirred mixing to be added in agitator dissolved with the half water of water-reducing agent
The other half water is mixed and stirring 4min is added by 4min, is formed the preferably high-densit concrete cover of uniform flow and is poured slurry
Body material is spare；
（3）By concrete slurry casting in template, using shock club vibration moulding, 5-15mm is reserved in order to which height causes
Close concrete cover pours；
（4）The normal concrete of vibration moulding was conserved to 3d ages, with cutting axe in the normal concrete knot completed
Several dents are dug out in structure face, form normal concrete dabbing process layer C；
（5）In step（4）By step above the dabbing process layer obtained after processing（3）The high-densit concrete protective prepared
The slurry of layer is poured into mold to full of entire mold；
（6）It is got product after concrete structure in above-mentioned mold is conserved according to conventional maintenance method.
The step（4）Dent surrounding spacing is 10 ~ 15cm on middle normal concrete dabbing process layer C, and indenture size is wanted
Ask for：Horizontal size 4cm, depth 3cm.
Housing industrialization had been increasingly becoming the essential development of building industry in recent years, implements housing industrialization and is not only
Change construction industry development mode, promote industry restructuring, promote the needs of industry science and technology content, and is advantageously implemented civilization
Construction ensures that construction quality, construction industry authorities at different levels have put into effect a series of economic policy and technical policy, to realize
Good basis has been established in the sound development of housing industrialization.Currently, house and town and country construction portion are studying and defining propulsion building
Industry modernization development outline and 13 development of housing industry planning and using city as the national housing industrialization of carrier
The associated documents such as the management method of experimental city and base enterprise.The research that overall assembled builds with component will greatly promote
The paces of residence industrialization, present invention can apply to the promotions of prefabricated components durability, are conducive to the implementation and development of housing industrialization.
The present invention is formed by two kinds of cement-based material layered combinations, structural feature：It is modified cement-based with high density nano
Material replaces normal concrete as external protection, and internal structure layer is still normal concrete, and uses special interface processing
Even transition of the material system in performance is realized in measure, and the thickness of protective layer is 5mm-15mm.
The beneficial effects of the invention are as follows：On the basis of traditional normal concrete, hierarchical design is carried out to concrete, is used
It is still common C40 concrete that high-densit nano modified concrete, which replaces portion of external C40 concrete, principal structural layer, is used
Dabbing treatment technology realizes even transition of the material system in performance, and then constitutes the concrete knot of endurance enhancing
Structure, to realize structure-function integration.The design of the protective layer structure can both resist the erosion of external environment harmful substance,
Especially its Anti-Chloride Ion Penetration can also reduce the material brought due to preparing high-performance homogenization structural material
It can be with the huge waste in cost.
Description of the drawings
Fig. 1 is concrete material structural schematic diagram of the present invention.
Fig. 2 is that the drying shrinkage of the high-densit concrete cover A of the embodiment of the present invention becomes at any time with autogenous shrinkage rate
Change figure.
In Fig. 1, A is high density nano modified concrete protective layer, and B is common C40 concrete layers, and C is normal concrete
Dabbing process layer.
Specific implementation mode
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.
Embodiment 1
A kind of nano modification high durability concrete material, it includes high-densit concrete cover A, normal concrete layer
B and normal concrete dabbing process layer C；The high-densit concrete cover A is located at the top of normal concrete layer B；It is described
Normal concrete dabbing process layer C is between high-densit concrete cover A and normal concrete layer B；
The weight ratio of the above-mentioned high-densit each component of concrete cover A raw materials be cement 20.75%, flyash 5.28%,
Slag 7.55%, silicon ash 4.15%, nano silicon dioxide 0.38%, sand 52.83%, water-reducing agent 0.75%, water 8.31%.
Above-mentioned normal concrete layer B is made of C40 concrete materials, and material mixture ratio is：Water 8.3%, cement 20.4%, sand
24.3%, stone 47.0%；
The above-mentioned specific preparation method of nano modification high durability concrete material is as follows：
（1）It is spare that water, cement, sand, stone according to weight proportion are mixed and made into normal concrete slurry；
（2）Cement, flyash, slag, silicon ash, nano silicon dioxide, sand are added to blender stirring according to proportioning
Dry mixing 3min in bucket, makes each basis material be uniformly dispersed, then is stirred mixing to be added in agitator dissolved with the half water of water-reducing agent
The other half water is mixed and stirring 4min is added by 4min, is formed the preferably high-densit concrete cover of uniform flow and is poured slurry
Body material is spare；
（3）By concrete slurry casting in template, using shock club vibration moulding, 10mm is reserved in order to high-densit
Concrete cover pours；
（4）The normal concrete of vibration moulding was conserved to 3d ages, with cutting axe in the normal concrete knot completed
Several dents are dug out in structure face, form normal concrete dabbing process layer C；
（5）In step（4）By step above the dabbing process layer obtained after processing（3）The high-densit concrete protective prepared
The slurry of layer is poured into mold to full of entire mold；
（6）It is got product after concrete structure in above-mentioned mold is conserved according to conventional maintenance method.
Embodiment 2
A kind of nano modification high durability concrete material, it includes high-densit concrete cover A, normal concrete layer
B and normal concrete dabbing process layer C；The high-densit concrete cover A is located at the top of normal concrete layer B；It is described
Normal concrete dabbing process layer C is between high-densit concrete cover A and normal concrete layer B；
The weight ratio of the above-mentioned high-densit each component of concrete cover A raw materials be cement 20.63%, flyash 5.25%,
Slag 7.51%, silicon ash 4.13%, nano silicon dioxide 0.75%, sand 52.53%, water-reducing agent 0.94%, water 8.26%.
The above-mentioned specific preparation method of nano modification high durability concrete material is as follows：
（1）It is spare that water, cement, sand, stone according to weight proportion are mixed and made into normal concrete slurry；
（2）Cement, flyash, slag, silicon ash, nano silicon dioxide, sand are added to blender stirring according to proportioning
Dry mixing 3min in bucket, makes each basis material be uniformly dispersed, then is stirred mixing to be added in agitator dissolved with the half water of water-reducing agent
The other half water is mixed and stirring 4min is added by 4min, is formed the preferably high-densit concrete cover of uniform flow and is poured slurry
Body material is spare；
（3）By concrete slurry casting in template, using shock club vibration moulding, 10mm is reserved in order to high-densit
Concrete cover pours；
（4）The normal concrete of vibration moulding was conserved to 3d ages, with cutting axe in the normal concrete knot completed
Several dents are dug out in structure face, form normal concrete dabbing process layer C；
（5）In step（4）By step above the dabbing process layer obtained after processing（3）The high-densit concrete protective prepared
The slurry of layer is poured into mold to full of entire mold；
（6）It is got product after concrete structure in above-mentioned mold is conserved according to conventional maintenance method.
Test case
The performance of high-densit concrete cover in Example 1 and Example 2 of the present invention concrete material is surveyed
Examination, wherein F1 are the protective layer material proportioning in embodiment 1, and F2 is the protective layer material proportioning in embodiment 2.Concrete outcome is shown in
Table 1, table 2 and Fig. 2.Wherein table 1 is the pressure-proof and snap-resistent strength test data of high-densit concrete cover, and table 2 is high-densit mixed
The adhesive bending strength and fluidity test data of solidifying protective soil layer mortar and normal concrete.
The pressure-proof and snap-resistent intensity of 1 high-densit concrete protective layer material of table and fluidity test data
Data can be seen that higher in nano silicon dioxide volume from table 1, and the pressure-proof and snap-resistent strength enhancing of test specimen is more,
28 days compression strength of F2 reach 68.58MPa, and the promotion of intensity has reacted the promotion of inside concrete compactness, shown nanometer
The incorporation of silica increases the compactness of material.The fluidity of F1 is 233.0mm, and F2 fluidities are 203.4mm, workability
It can be good.
2 high-densit mortar of table and the anti-folded knotting strength experimental result of normal concrete
Table 2 is the product after the concrete structure prepared by the embodiment of the present invention 1 and 2 conserves 28 days, texas,U.S requirement
Adhesive bending strength >=3MPa of patching material.China《Distress in concrete epoxide resin grouting material》Code requirement is dry viscous
Knotting strength >=3.0MPa.Experiment shows that high-densit concrete and the adhesive bending strength of C40 concrete are more than 3MPa, reaches use
It is required that.
It can be seen that, increasing with the volume of nano material from Fig. 2 data, autogenous shrinkage aggravates with dry shrink, and 28
Its contract with dry rate reaches 0.62% × 10-3, autogenous shrinkage rate is 0.2 % × 10-3, under normal circumstances, 28 days of C40 normal concretes
Drying shrinkage is 0.3 × 10-3%~0.4%×10-3, the shrinking percentage of protective layer and the shrinking percentage of normal concrete are in same quantity
Grade, it may be possible to because the incorporation of flyash inhibits the contraction of mortar.This illustrates that protective layer and normal concrete have good association
Same working performance.
The chlorion of present invention nano modification high durability concrete material also made to embodiment 1 and embodiment 2 is anti-
Permeance property is tested, and the results are shown in Table 3.Wherein C40 is single layer structure normal concrete, and F1, F2 are corresponding respectively to be implemented
Concrete protective layer material and 10mmF1+40mmC40,10mmF2+40mmC40 in example 1,2 are respectively Examples 1 and 2 institute
Product after the concrete structure maintenance 56d ages of preparation.
3 chlorion transmission performance test result of table
It can be seen that the Cl of single layer structure (C40, F1, F2) from the data in table 3–Diffusion coefficient D rcm and 6h are led
Electricity Q declines successively.Compared with the Drcm of C40 normal concretes, the Drcm of F1, F2 have dropped 1 order of magnitude, with C40
Q compare, the Q of F1 and F2 have dropped 2 orders of magnitude.Compared with the high-densit structure of single layer, with protective layer structure
10mmF1+40mmC40,10mmF2+40mmC40 group Cl–Diffusion coefficient D rcm and 6 h electric conduction quantities Q are slightly improved.With it is common
The Drcm of C40 concrete is compared, and carries the 10mmF1+40mmC40 of protective layer structure, and 10mmF2+40mmC40 groups Drcm has dropped
1 order of magnitude, Q have dropped 2 orders of magnitude.According to ASTM C1556-04（Standard Test Method for
Determining the Apparent Chloride Diffusion Coefficient of Cementitious
Mixtures by Bulk Diffusion, 2004）The Cl of single layer structure (C40, F1, F2)-Permeance property be respectively "high",
" extremely low " and " extremely low " carries the Cl of protective layer structure test specimen-Permeance property is " extremely low ".According to ASTM C1202-05
（Standard Test Method for Electrical Indication of Concrete’s Ability to
Resist Chloride Ion Penetration, 2005）, the Cl of single layer structure (F1, F2) and protective layer structure-It oozes
Permeability can be " very low ".This illustrates that the high durability concrete material prepared by the present invention has good durability, real
It is uniform excessive in performance to have showed material system, and then has constituted the concrete structure of endurance enhancing, to realize structure
Function integration.Thus, concrete material prepared by the present invention can both resist the erosion of external environment harmful substance, can be with
Reduce the huge waste on the material property and cost brought due to preparing high-performance homogenization structural material.
Claims (3)
1. a kind of nano modification high durability concrete material, which is characterized in that it includes high-densit concrete cover A, general
Logical concrete layer B and normal concrete dabbing process layer C；The high-densit concrete cover A is located at normal concrete layer B's
Top；The normal concrete dabbing process layer C is between high-densit concrete cover A and normal concrete layer B；It is described
B layers of normal concrete is made of C40 concrete materials, and material mixture ratio is：Water 8.3%, cement 20.4%, sand 24.3%, stone
47.0%；
The high-densit concrete cover A is made of the raw material of following weight percent：Cement 20.63 ~ 20.75%, fine coal
Ash 5.25 ~ 5.28%, slag 7.51 ~ 7.55%, silicon ash 4.13 ~ 4.15%, nano silicon dioxide 0.38% ~ 0.75%, sand 52.53%
~ 52.83%, water-reducing agent 0.75% ~ 0.94%, water 8.26 ~ 8.31%；
The preparation method of the nano modification high durability concrete material includes the following steps：
（1）It is spare that water, cement, sand, stone according to weight proportion are mixed and made into normal concrete slurry；
（2）Cement, flyash, slag, silicon ash, nano silicon dioxide, sand are added to according to proportioning in blender agitator
Dry mixing 3min makes each basis material be uniformly dispersed, then stirs 4min by mixing to be added in agitator dissolved with the half water of water-reducing agent,
The other half water is mixed, stirring 4min is added, it is standby that the formation preferably high-densit concrete cover of uniform flow pours slurry material
With；
（3）By concrete slurry casting in template, using shock club vibration moulding, 5-15mm is reserved in order to high-densit mixed
Solidifying protective soil layer pours；
（4）The normal concrete of vibration moulding was conserved to 3d ages, with cutting axe in the normal concrete structural plane completed
Several dents are dug out, normal concrete dabbing process layer C is formed；Dent surrounding spacing is 10 ~ 15cm on dabbing process layer C, recessed
Trace size requires：Horizontal size 4cm, depth 3cm；
（5）In step（4）By step above the dabbing process layer obtained after processing（3）The high-densit concrete cover prepared
Slurry is poured into mold to full of entire mold；
（6）It is got product after concrete structure in above-mentioned mold is conserved according to conventional maintenance method.
2. concrete material according to claim 1, which is characterized in that the thickness of the high-densit concrete cover A
Degree is 5mm-15mm.
3. concrete material according to claim 1, which is characterized in that the nano silicon dioxide is Aladdin hydrophilic
Meteorological Nano-meter SiO_22, grain size 7-40nm, average grain diameter 25nm.
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| CN106946512A (en) * | 2017-03-27 | 2017-07-14 | 浙江大学 | A kind of preparation method of high water-tight concrete |
| CN108439911A (en) * | 2018-05-11 | 2018-08-24 | 安徽砼宇特构科技有限公司 | A kind of high durability concrete component and preparation method thereof |
| CN108609952B (en) * | 2018-05-21 | 2021-04-09 | 济南大学 | Composite modified concrete and method for testing interface transition zone thereof |
| CN110218054A (en) * | 2019-06-19 | 2019-09-10 | 西安建筑科技大学 | A kind of nano clay modified high performance concrete and the preparation method and application thereof |
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| CN103195260A (en) * | 2013-04-01 | 2013-07-10 | 中交四航工程研究院有限公司 | Reinforcing structure capable of ensuring new and old concrete structures to be stressed together and reinforcing construction method thereof |
| CN203462588U (en) * | 2013-08-09 | 2014-03-05 | 燕兰 | Novel wear-resisting nano-concrete protecting layer |
| CN105294006A (en) * | 2015-10-23 | 2016-02-03 | 上海建工集团股份有限公司 | C100-C120 graded ultrahigh-strength concrete having high workability |
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| CN102092993A (en) * | 2010-11-25 | 2011-06-15 | 浙江大学 | Nano reinforcing method for recycled aggregate concrete |
| CN102518275A (en) * | 2011-12-20 | 2012-06-27 | 南京倍立达实业有限公司 | Nano self-cleaning fiber reinforced cement product and production method for same |
| CN102731046A (en) * | 2012-07-13 | 2012-10-17 | 阳泉昌达混凝土搅拌站 | Preparation method for nano concrete |
| CN104628335A (en) * | 2015-02-09 | 2015-05-20 | 沈阳大学 | Method for preparing nanometer silicon dioxide high-performance concrete |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103195260A (en) * | 2013-04-01 | 2013-07-10 | 中交四航工程研究院有限公司 | Reinforcing structure capable of ensuring new and old concrete structures to be stressed together and reinforcing construction method thereof |
| CN203462588U (en) * | 2013-08-09 | 2014-03-05 | 燕兰 | Novel wear-resisting nano-concrete protecting layer |
| CN105294006A (en) * | 2015-10-23 | 2016-02-03 | 上海建工集团股份有限公司 | C100-C120 graded ultrahigh-strength concrete having high workability |
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Inventor after: Zhang Xiuzhi Inventor after: Hou Pengkun Inventor after: You Ziyang Inventor after: Zhang Rui Inventor after: Zhou Zonghui Inventor after: Cheng Xin Inventor before: Zhang Xiuzhi Inventor before: Hou Pengkun Inventor before: The inventor has waived the right to be mentioned Inventor before: Zhang Rui Inventor before: Zhou Zonghui Inventor before: Cheng Xin |
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Effective date of registration: 20200930 Address after: Tai'an City, Shandong province 271222 East Town Xintai City Patentee after: POWER CHINA SHANDONG PIPELINE ENGINEERING Corp.,Ltd. Address before: The central nanxinzhuang Ji'nan Road, No. 336 of 250022 cities in Shandong Province Patentee before: University of Jinan |
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