CN104591664B - Long-life concrete for steel-mixed combination beam hogging moment area and preparation method thereof - Google Patents
Long-life concrete for steel-mixed combination beam hogging moment area and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of long-life concrete for steel reinforced concrete combination beam hogging moment area and preparation method thereof, relate to long-life concrete preparation field.Long-life concrete in parts by mass, including 456～520 parts of Binder Materials, 1748～1813 parts gather materials, 0.80～1.50 part of imitative steel fibre, 2.05～2.86 parts of toughening materials, 4.10～5.72 parts of water reducers and 142～148 parts of water；28 days d comprcssive strength >=69.0MPa, 28d rupture strength >=7.0MPa, 28d tensile splitting strength >=5.0MPa, 28d elastic modelling quantity >=36.0GPa, 56d chloride diffusion coefficient ＜ 4.0 × 10 of described long-life concrete‑12m2/ s, cracking resistance grade reach L IV grade, 28d Bending toughness index I20≥8.The bending tensile strength of long-life concrete, bent toughness and crack resistance are the highest, change concrete fragility, and not only structure durability is good, and service life is long, and cost is relatively low, it is simple to use in a large number.
Description
Technical field
The present invention relates to long-life concrete preparation field, be specifically related to a kind of negative for steel-mixed combination beam
The long-life concrete in moment of flexure district and preparation method thereof.
Background technology
Along with the development of society, steel-mixed combination beam (i.e. girder steel and concrete slab combination) is widely used in
Large bridge, combined beam structure is compared with the bridge of other versions, in construction, safeguards and uses
Life-span aspect, has many good qualities.Compared with general steel-mixed combination beam, the steel under marine environment-mixed group
Close the work under bad environment of the concrete of beam, to be not only also subject to by the repeated action of traffic loading
The effect such as Chloride Attack in variations in temperature, alternation of wetting and drying, salt fog.Therefore, under marine environment
The concrete of steel-mixed combination beam needs have excellent toughness and structure durability；For steel-mixed combination
For the bridge deck concrete of negative moment section of beam, bridge deck concrete and steel girder at elastic modelling quantity, scratch
There is larger difference in the characteristic aspects such as bent deformation, fatigue behaviour and toughness, causes bridge deck concrete work
Make environment more severe, resistance to drawing property of bending resistance, toughness, splitting resistance and the structure of bridge deck concrete
Property requires higher for a long time.
Below the method for existing raising crack-resistant performance of concrete and structure durability is introduced.
One, the cracking resistance of concrete is improved
At present, the most typically by admixture steel fibre or organic polymer fiber (such as polyacrylonitrile
And polypropylene) improve toughness and the ductility of concrete, prepare relatively high cracking resistance can concrete, but
It is admixture steel fibre or organic polymer fiber is respectively present following defect:
(1) steel fibre itself easily corrosion, it is impossible to meet the life requirement under marine environment, and
And steel fibre (such as Cu coated fibre) is relatively costly, inconvenience is a large amount of to be used.
(2) tensile strength and the elastic modelling quantity of organic polymer fiber self are relatively low, it is difficult to solve spy
Determining the crack resistance problem of composite beam bridge panel under environment, the floorings of steel-mixed combination beam hogging moment area mix
When solidifying soil uses organic polymer fiber to prepare, can draw because of bending resistance and toughness is not enough and occur that structure is broken
Bad, and then make service life shorter.
Two, concrete structure durability is improved
At present, concrete mainly by Adding Mineral Admixtures (such as flyash, ground slag powder and
Silica flour etc.) and high efficiency water reducing agent improve the density of concrete, and then improve chloride-penetration resistance energy
Power.But a large amount of engineering practices show, Adding Mineral Admixtures is being improved working performance of concrete and is being resisted
While chloride permeability performance, the autogenous shrinkage of concrete can be increased, and then make concrete easy
Produce crack, provide passage to aggressivity chloride ion and carbon dioxide, accelerate harmful ion and corrode
Speed, causes concrete deterioration, reduces concrete structure durability.
Summary of the invention
For defect present in prior art, it is an object of the invention to provide a kind of for steel-mixed group
Close long-life concrete of negative moment section of beam and preparation method thereof.The long-life concrete of the present invention
28d comprcssive strength >=69.0MPa, 28d rupture strength >=7.0MPa, 28d tensile splitting strength >=
5.0MPa, 28d elastic modelling quantity >=36.0GPa, 56d chloride diffusion coefficient ＜ 4.0 × 10-12m2/s、
Cracking resistance grade reaches L-IV grade, 28d Bending toughness index I20≥8.The bending resistance of long-life concrete is drawn
Intensity, bent toughness and crack resistance are the highest, change concrete fragility, not only structure durability
Good, service life is long, and cost is relatively low, it is simple to use in a large number.
For reaching object above, the long-life for steel-mixed combination beam hogging moment area that the present invention provides mixes
Solidifying soil, in parts by mass, including 456～520 parts of Binder Materials, 1748～1813 parts gather materials, 0.80～
1.50 parts of imitative steel fibres, 2.05～2.86 parts of toughening materials, 4.10～5.72 parts of water reducers and 142～148
Part water；28d comprcssive strength >=69.0MPa, 28d rupture strength of described long-life concrete >=
7.0MPa, 28d tensile splitting strength >=5.0MPa, 28d elastic modelling quantity >=36.0GPa, cracking resistance grade
Reach L-IV grade, 56d chloride diffusion coefficient ＜ 4.0 × 10-12m2/ s, 28d Bending toughness index I20
≥8。
On the basis of technique scheme, in parts by mass, including 487 parts of Binder Materials, 1782
Part gather materials, 1.00 parts of imitative steel fibres, 2.44 parts of toughening materials, 4.87 parts of water reducers and 146 parts of water.
On the basis of technique scheme, described Binder Materials in parts by mass, including 0.65 part of water
Mud, 0.15 part of flyash and 0.20 part of slag powders；Described cement uses 52.5 grades of portland cements,
Described flyash uses I grade of flyash, and described slag powders uses S95 grade slag powder.
On the basis of technique scheme, described in gather materials in parts by mass, including 1 part of coarse aggregate and
0.64 part of fine aggregate；Described coarse aggregate uses particle diameter to be 5～20mm graded broken stones, described fine aggregate
Use nature medium sand.
On the basis of technique scheme, described imitative steel fibre is processed into for using 100% polypropylene
The vimentin filament of type, diameter 0.8～1.2mm, length 30 ± 2mm, proportion 0.91～0.93g/cm3,
Tensile strength >=500MPa.
On the basis of technique scheme, described toughening material is that organic polymer is water-dispersible micro-nano
Material, its key structure is the polyurethane ester structure of double bond end-blocking, 28d energy to failure loss-rate ＞
160%.
On the basis of technique scheme, described water reducer is polycarboxylate high performance water-reducing agent, subtracts
Water rate >=25%.
The preparation of the long-life concrete for above-mentioned steel-mixed combination beam hogging moment area that the present invention provides
Method, comprises the following steps:
S1: 456～520 parts of Binder Materials and 1748～1813 parts are gathered materials addition stirring by mass parts
Machine, by Binder Materials and the uniform stirring 30s that gathers materials, forwards step S2 to；
S2: be sprinkled into 0.80～1.50 part of imitative steel fibre in blender, by Binder Materials, gathers materials and imitates
Steel fibre is stirred together for 30s, forwards step S3 to；
S3: 4.10～5.72 parts of water reducers and 142～148 portions of aqueous fusions are closed and form mixed liquor；Successively
Mixed liquor and 2.05～2.86 parts of toughening materials are added in blenders, by Binder Materials, gather materials, imitative
Steel fibre, mixed liquor and toughening material are stirred together for 3min, and obtaining the slump is 180～220mm
Pumpable concrete mix.
Compared with prior art, it is an advantage of the current invention that:
(1) adding toughening material in the concrete of the present invention, toughening material can absorb cement water
Change the part calcium ion produced, and then reduce the calcium ion in concrete hole solution.The minimizing of calcium ion
Make the calcium silicon of the C-S-H gel that hydrated cementitious generates than reducing, C-S-H gel can not only be improved
The intensity of component, and the adhesion strength of concrete substrate and interfacial transition zone has been promoted.
Meanwhile, the toughening material of the present invention can be pressed down by the spacial framework with cement matrix
The germinating of micro-crack processed, the present invention imitates steel fibre and can expand by slowly extracting gradually release opposing crack
The energy of exhibition, improves imitative steel fibre-cement matrix, aggregate-cement slowing down while stress is concentrated
Interfacial structure between matrix, and then make imitative steel fibre need to overcome bigger bonding in withdrawal process
Power, the long-life concrete obtaining there is anti-fatigue performance, high tenacity and high cracking resistance with this.
28d comprcssive strength >=69.0MPa, 28d rupture strength of the long-life concrete of the present invention >=
7.0MPa, 28d tensile splitting strength >=5.0MPa, 28d elastic modelling quantity >=36.0GPa, cracking resistance grade
Reach L-IV grade, 56d chloride diffusion coefficient ＜ 4.0 × 10-12m2/ s, 28d Bending toughness index I20
≥8。
(2) toughening material of the present invention absorbs the part calcium ion that hydrated cementitious produces in concrete
Define the polymeric film with high-elastic high powerful feature, not only improve-the boundary of hardened cement paste that gathers materials
The microscopic appearance of face transition region and degree of compaction, and improve the adhesion strength of interfacial transition zone so that
Originally at interfacial transition zone enrichment the hydrolysis product of cement Ca (OH) of oriented growth2The orientation of crystal
Weakening, crystallite dimension refines, and then plays the effect improving boundary zone degree of compaction.
(3) compared with steel fibre in prior art, the present invention uses imitative steel fibre, at same volume
Under volume, imitative steel fibre weight is only the 1/8 of steel fibre weight, and its cost is relatively low, it is simple to great Liang Ying
With.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail.
The long-life concrete for steel-mixed combination beam hogging moment area in the embodiment of the present invention, by quality
Part meter, including 456～520 parts of Binder Materials, 1748～1813 parts gather materials, 0.80～1.50 part imitate
Steel fibre, 2.05～2.86 parts of toughening materials, 4.10～5.72 parts of water reducers and 142～148 parts of water.
The 28d of the long-life concrete for steel-mixed combination beam hogging moment area in the embodiment of the present invention
Comprcssive strength >=69.0MPa, 28d rupture strength >=7.0MPa, 28d tensile splitting strength >=5.0MPa,
28d elastic modelling quantity >=36.0GPa, cracking resistance grade reach L-IV grade, 56d chloride diffusion coefficient ＜
4.0×10-12m2/ s, 28d Bending toughness index I20≥8。
Long-life concrete in the present embodiment, in parts by mass, specifically include 487 parts of Binder Materials,
1782 parts gather materials, 1.00 parts of imitative steel fibres, 2.44 parts of toughening materials, 4.87 parts of water reducers and 146 parts
Water.
Binder Materials in the present embodiment in parts by mass, including 0.65 part of cement, 0.15 part of flyash
With 0.20 part of slag powders；Cement uses 52.5 grades of portland cements, and flyash uses I grade of flyash,
Slag powders uses S95 grade slag powder.
The present embodiment gather materials in parts by mass, including 1 part of coarse aggregate and 0.64 part of fine aggregate；Slightly
The employing particle diameter that gathers materials is 5～20mm graded broken stones, and fine aggregate uses nature medium sand.
Imitative steel fibre in the present embodiment is the vimentin filament using 100% polypropylene machine-shaping, directly
Footpath 0.80～1.2mm, length 30 ± 2mm, proportion 0.91～0.93g/cm3, elongation at break
15%～25%, tensile strength >=500MPa；Toughening material is a kind of water-dispersible micro-nano of organic polymer
Rice material, its key structure is the polyurethane ester structure of double bond end-blocking, 28d energy to failure loss-rate ＞
160%；Water reducer uses polycarboxylate high performance water-reducing agent, water-reducing rate >=25%；Hydromining tap water.
The long-life concrete for above-mentioned steel-mixed combination beam hogging moment area in the embodiment of the present invention
Preparation method, comprises the following steps:
S1: 456～520 parts of Binder Materials and 1748～1813 parts are gathered materials addition stirring by mass parts
Machine, by Binder Materials and the uniform stirring 30s that gathers materials, forwards step S2 to.
S2: be sprinkled into 0.80～1.50 part of imitative steel fibre in blender, by Binder Materials, gathers materials and imitates
Steel fibre is stirred together for 30s, forwards step S3 to.
S3: 4.10～5.72 parts of water reducers and 142～148 portions of aqueous fusions are closed and form mixed liquor；Successively
Mixed liquor and 2.05～2.86 parts of toughening materials are added in blenders, by Binder Materials, gather materials, imitative
Steel fibre, mixed liquor and toughening material are stirred together for 3min, and obtaining the slump is 180～220mm
Pumpable concrete mix.
Below by 7 embodiments and 1 comparative example, (embodiment 0 is for being not spiked with imitative steel fibre and increasing
The comparative example of tough material) long-life for steel-mixed combination beam hogging moment area of illustrating the present invention mixes
Solidifying soil and preparation method thereof.
In embodiment 0～7, the quality proportioning of each component is as shown in table 1, and embodiment 1～7 is the present invention
In long-life concrete for steel-mixed combination beam hogging moment area, embodiment 4 is for being applied to ocean bridge
The bridge deck concrete theory match ratio of engineering entity steel-mixed combination beam hogging moment area, it was predicted that can meet
120 years design service lifes, remaining embodiment is the test match ratio of research.
The constituent mass proportioning table of table 1 embodiment 0～7
Binder Materials in embodiment 1～7 in parts by mass, including 0.65 part of China Resources cement (Pingnan County)
Company limited P II 52.5 portland cement, the F of 0.15 part of Zhenjiang new material branch company of Hua Yuan group
I grade of flyash of class, the S95 grade slag powder of 0.20 part of Tangshan Cao Fei Dian Dunshi building material company limited.
Embodiment 1～7 gather materials in parts by mass, including 1 part of coarse aggregate and 0.64 part of fine aggregate.
Coarse aggregate use Jiangmen newly continuous grading rubble that plain boiled water band stone field particle diameter is 5～20mm；Fine aggregate
Using the natural river sand in the Xijiang River, modulus of fineness is 2.9.
Imitative steel fibre in embodiment 1～7 uses the organic conjunction of TB-30 of Tai'an companion's fiber company limited
Become vimentin filament, diameter 0.81mm, length 30mm, proportion 0.91g/cm3, elongation at break 15.2%,
Tensile strength 503MPa；Toughening material uses Jiangsu Subotexin Material Co., Ltd's liquidConcrete in-situ toughening material, 28d energy to failure loss-rate 179%；Water reducer uses Shandong
Hua Weiyin triumphant building materials Science and Technology Co., Ltd. NOF-AS polycarboxylate high performance water-reducing agent, water-reducing rate
29%；Hydromining tap water.
Below the concrete in embodiment 0～7 is carried out performance test according to tests below method standard,
The properties data drawn are as shown in table 2.
(1) comprcssive strength: according to " standard for test methods of mechanical properties of ordinary concrete " GB/T
50081-2002 detects concrete crushing strength, and sample dimensions is 150mm × 150mm × 150mm
Cube.
(2) rupture strength: according to " standard for test methods of mechanical properties of ordinary concrete " GB/T
50081-2002 detects concrete flexural strength, and sample dimensions is 150mm × 150mm × 550mm
Girder test specimen.
(3) tensile splitting strength: according to " standard for test methods of mechanical properties of ordinary concrete " GB/T
50081-2002 detects concrete splitting tensile strength, sample dimensions be 150mm × 150mm ×
The cube of 150mm.
(4) elastic modelling quantity: according to " standard for test methods of mechanical properties of ordinary concrete " GB/T
50081-2002 detects modulus of elasticity of concrete, and sample dimensions is 150mm × 150mm × 300mm
Prism.
(5) chloride diffusion coefficient: according to " normal concrete long-term behaviour and endurance quality test
Method standard " GB/T50082-2009 detects Chloride Diffusion Coefficient in Concrete, and sample dimensions is Φ 100
The cylinder of × 50mm.
(6) Bending toughness index: according to " fiber concrete test method standard " CECS13:2009
The Bending toughness index of detection concrete, sample dimensions is the little of 150mm × 150mm × 550mm
Beam test specimen.
(7) cracking resistance grade: according to " Standard for test methods of longterm performance and durability of ordinary concrete mark
Accurate " GB/T50082-2009 and " concrete durability check evaluation criterion " JGJ/T193-2009 comments
Valency cracking resistance grade, sample dimensions is the flat thin template test specimen of 800mm × 600mm × 100mm.
Table 2 embodiment 0～7 performance test data table
It can be seen that embodiment 0 is compared with embodiment 1～7,28d comprcssive strength, 28d springform
The result data of amount and 56d chloride diffusion coefficient is close, but the 28d in embodiment 1～7 resists
Folding intensity, 28d tensile splitting strength, 28d Bending toughness index and cracking resistance grade are all significantly larger than real
Executing example 0, the bending tensile strength of embodiment 1～7 long-life concrete is high, cracking resistance and good toughness.
The present invention is not limited to above-mentioned embodiment, comes for those skilled in the art
Saying, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these change
Enter and within retouching is also considered as protection scope of the present invention.The content not being described in detail in this specification
Belong to prior art known to professional and technical personnel in the field.
Claims (4)
1. the long-life concrete for steel-mixed combination beam hogging moment area, it is characterized in that: in parts by mass, including 456～520 parts of Binder Materials, 1748～1813 parts gather materials, 0.80～1.50 part of imitative steel fibre, 2.05～2.86 parts of toughening materials, 4.10～5.72 parts of water reducers and 142～148 parts of water；The 28d comprcssive strength of described long-life concrete >=69.0MPa, 28d rupture strength >=7.0MPa, 28d tensile splitting strength >=5.0MPa, 28d elastic modelling quantity >=36.0GPa, cracking resistance grade reach L-IV grade, 56d chloride diffusion coefficient ＜ 4.0 × 10-12m2/ s, 28d Bending toughness index I20≥8；Described imitative steel fibre is the vimentin filament using 100% polypropylene machine-shaping, diameter 0.8～1.2mm, length 30 ± 2mm, proportion 0.91～0.93g/cm3, tensile strength >=500MPa；Described Binder Materials in parts by mass, including 0.65 part of cement, 0.15 part of flyash and 0.20 part of slag powders；Described cement uses 52.5 grades of portland cements, and described flyash uses I grade of flyash, and described slag powders uses S95 grade slag powder；Described gather materials in parts by mass, including 1 part of coarse aggregate and 0.64 part of fine aggregate；Described coarse aggregate uses particle diameter to be 5～20mm graded broken stones, and described fine aggregate uses nature medium sand；Described toughening material is the water-dispersible micro Nano material of organic polymer, and its key structure is the polyurethane ester structure of double bond end-blocking, 28d energy to failure loss-rate ＞ 160%.
2. the long-life concrete for steel-mixed combination beam hogging moment area as claimed in claim 1, it is characterized in that: in parts by mass, specifically include 487 parts of Binder Materials, 1782 parts gather materials, 1.00 parts of imitative steel fibres, 2.44 parts of toughening materials, 4.87 parts of water reducers and 146 parts of water.
3. the long-life concrete for steel-mixed combination beam hogging moment area as claimed in claim 1 or 2, it is characterised in that: described water reducer is polycarboxylate high performance water-reducing agent, water-reducing rate >=25%.
4. the preparation method for the long-life concrete for steel-mixed combination beam hogging moment area described in claim 1, it is characterised in that comprise the following steps:
S1: 456～520 parts of Binder Materials and 1748～1813 parts are gathered materials addition blender by mass parts, by Binder Materials and the uniform stirring 30s that gathers materials, forward step S2 to；
S2: be sprinkled into 0.80～1.50 part of imitative steel fibre in blender, by Binder Materials, gathering materials and imitating steel fibre is stirred together for 30s, forwards step S3 to；
S3: 4.10～5.72 parts of water reducers and 142～148 portions of aqueous fusions are closed and form mixed liquor；Successively mixed liquor and 2.05～2.86 parts of toughening materials are added in blenders, by Binder Materials, gather materials, imitative steel fibre, mixed liquor and toughening material are stirred together for 3min, obtain the pumpable concrete mix that the slump is 180～220mm.
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| CN106958197A (en) * | 2017-02-24 | 2017-07-18 | 南京航空航天大学 | Composite bridge and its construction method that floorings longitudinal elasticity is not waited |
| CN108546030B (en) * | 2018-04-23 | 2020-09-29 | 中铁大桥局集团有限公司 | High-strength concrete with low consumption of cementing materials and easy pumping and preparation method thereof |
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| CN102086101A (en) * | 2009-12-08 | 2011-06-08 | 西安万达工程科技有限公司 | Composite fiber for bridge |
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