CN104591664A - Long-service-life concrete for steel-concrete composite beam hogging moment area and preparation method long-service-life concrete - Google Patents
Long-service-life concrete for steel-concrete composite beam hogging moment area and preparation method long-service-life concrete Download PDFInfo
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Abstract
The invention discloses long-service-life concrete for a steel-concrete composite beam hogging moment area and a preparation method of the long-service-life concrete, and relates to the field of long-service-life concrete preparation. The long-service-life concrete comprises, in parts by mass, 456-520 parts of a cementing material, 1748-1813 parts of aggregates, 0.80-1.50 parts of imitation steel fibres, 2.05-2.86 parts of a toughening material, 4.10-5.72 parts of a water reducer and 142-148 parts of water; the 28-d compressive strength of the long-service-life concrete is not less than 69.0MPa, the 28-d breaking strength of the long-service-life concrete is not less than 7.0MPa, the 28-d splitting tensile strength of the long-service-life concrete is not less than 5.0MPa, the 28-d elasticity modulus of the long-service-life concrete is not less than 36.0GPa, the 56-d chloride ion diffusion coefficient of the long-service-life concrete is less than 4.0*10<-12>m<2>/s, the cracking resistance rank of the long-service-life concrete achieves L-IV rank, and the 28-d bend ductility index I20 of the long-service-life concrete is not less than 8. The flexural strength, bend ductility and crack resistance of the long-service-life concrete are high, the fragility of the concrete is changed, and the concrete is good in structure durability, long in service life, low in cost, and convenient to massively use.
Description
Technical field
The present invention relates to long lifetime concrete preparation field, be specifically related to a kind of long lifetime concrete for steel-mixed compound beam hogging moment area and preparation method thereof.
Background technology
Along with the development of society, steel-mixed compound beam (i.e. girder steel and concrete slab combination) is widely used in large bridge, and combined beam structure is compared with the bridge of other structure formations, in construction, safeguards and in work-ing life, has many good qualities.Compared with general steel-mixed compound beam, the concrete work under bad environment of the steel under ocean environment-mixed compound beam, not only will be subject to the repeated action of traffic loading, also will to be subject in temperature variation, alternation of wetting and drying, salt fog the effects such as Chloride Attack.Therefore, the concrete of the steel under ocean environment-mixed compound beam needs to have excellent toughness and structure durability; For the bridge deck concrete of steel-mixed compound beam hogging moment area, larger difference is there is in bridge deck concrete and steel girder in the characteristics such as Young's modulus, deflection deformation, fatigue property and toughness, cause bridge deck concrete Working environment more severe, require higher to the drawing property of bending resistance of bridge deck concrete, toughness, splitting resistance and structure durability.
Below the method for existing raising crack-resistant performance of concrete and structure durability is introduced.
One, concrete resistance to cleavage is improved
At present, generally improve concrete toughness and ductility by admixture steel fiber or organic polymer fiber (such as polyacrylonitrile and polypropylene) both at home and abroad, prepare the concrete compared with high cracking resistance energy, but there is following defect respectively in admixture steel fiber or organic polymer fiber:
(1) steel fiber itself easily corrosion, cannot meet the life requirement under ocean environment, and the cost of steel fiber (such as Cu coated fibre) is higher, inconvenience uses in a large number.
(2) tensile strength of organic polymer fiber self and Young's modulus lower, be difficult to the splitting resistance problem of the composite beam bridge panel under solution specific environment, when the bridge deck concrete of steel-mixed compound beam hogging moment area adopts organic polymer fiber to prepare, can because of bending resistance draw and toughness not enough and occur structure deteriorate, and then make work-ing life shorter.
Two, concrete structure durability is improved
At present, concrete improves concrete density mainly through Adding Mineral Admixtures (such as flyash, ground slag powder and silica flour etc.) and high efficiency water reducing agent, and then improves the resistance of concrete to chloride ion penetration.But a large amount of engineering practice shows, Adding Mineral Admixtures is while improving concrete work performance and Anti-Chloride Ion Penetration, concrete autogenous shrinkage can be increased, and then make concrete easily produce crack, passage is provided to aggressiveness chlorion and carbonic acid gas, accelerate harmful ion erosion rate, cause concrete deterioration, reduce concrete structure durability.
Summary of the invention
For the defect existed in prior art, the object of the present invention is to provide a kind of long lifetime concrete for steel-mixed compound beam hogging moment area and preparation method thereof.Long lifetime of the present invention concrete 28d ultimate compression strength>=69.0MPa, 28d folding strength>=7.0MPa, 28d tensile splitting strength>=5.0MPa, 28d Young's modulus>=36.0GPa, 56d chloride diffusion coefficient < 4.0 × 10
-12m
2/ s, cracking resistance grade reach L-IV grade, 28d Bending toughness index I
20>=8.Long lifetime concrete bending tensile strength, bend ductility and splitting resistance are all higher, change concrete fragility, and not only structure durability is good, long service life, and cost is lower, are convenient to a large amount of use.
For reaching above object, long lifetime concrete for steel-mixed compound beam hogging moment area provided by the invention, by mass parts, comprise 456 ~ 520 parts of gelling material, 1748 ~ 1813 parts gather materials, 0.80 ~ 1.50 part of imitative steel fiber, 2.05 ~ 2.86 parts of toughening materials, 4.10 ~ 5.72 parts of water reducers and 142 ~ 148 parts of water; Concrete 28d ultimate compression strength>=69.0MPa, 28d folding strength>=7.0MPa, 28d tensile splitting strength>=5.0MPa, 28d Young's modulus>=36.0GPa of described long lifetime, cracking resistance grade reach L-IV grade, 56d chloride diffusion coefficient < 4.0 × 10
-12m
2/ s, 28d Bending toughness index I
20>=8.
On the basis of technique scheme, by mass parts, comprise 487 parts of gelling material, 1782 parts gather materials, 1.00 parts of imitative steel fibers, 2.44 parts of toughening materials, 4.87 parts of water reducers and 146 parts of water.
On the basis of technique scheme, described gelling material, by mass parts, comprises 0.65 part of cement, 0.15 part of flyash and 0.20 part of slag powders; Described cement adopts 52.5 grades of silicate cements, and described flyash adopts I grade of flyash, and described slag powders adopts S95 grade slag powder.
On the basis of technique scheme, described in gather materials by mass parts, comprise 1 part of coarse aggregate and 0.64 part of fine aggregate; Described coarse aggregate adopts particle diameter to be 5 ~ 20mm graded broken stone, and described fine aggregate adopts nature medium sand.
On the basis of technique scheme, described imitative steel fiber is the vimentin filament of employing 100% polypropylene machine-shaping, diameter 0.8 ~ 1.2mm, length 30 ± 2mm, proportion 0.91 ~ 0.93g/cm
3, tensile strength>=500MPa.
On the basis of technique scheme, described toughening material is organic polymer water-dispersion micro Nano material, and its key structure is the polyurethane ester structure of double bond end-blocking, 28d energy-to-break loss-rate > 160%.
On the basis of technique scheme, described water reducer is polycarboxylate high performance water-reducing agent, water-reducing rate >=25%.
Long lifetime concrete preparation method for above-mentioned steel-mixed compound beam hogging moment area provided by the invention, comprises the following steps:
S1: 456 ~ 520 parts of gelling material and 1748 ~ 1813 parts to be gathered materials by mass parts and add stirrer, by gelling material and the uniform stirring 30s that gathers materials, forwards step S2 to;
S2: be sprinkled into 0.80 ~ 1.50 part of imitative steel fiber in stirrer, by gelling material, to gather materials and imitative steel fiber stirs 30s jointly, forwards step S3 to;
S3: 4.10 ~ 5.72 parts of water reducers and 142 ~ 148 portions of aqueous fusions are closed and forms mixed solution; Successively mixed solution and 2.05 ~ 2.86 parts of toughening materials are added in stirrer, by gelling material, gather materials, imitative steel fiber, mixed solution and toughening material stir 3min jointly, obtains the pumpable concrete mix that the slump is 180 ~ 220mm.
Compared with prior art, the invention has the advantages that:
(1) add toughening material in concrete of the present invention, toughening material can absorb the part calcium ion that hydrated cementitious produces, and then reduces the calcium ion in concrete hole solution.The calcium silicon of the C-S-H gel that the minimizing of calcium ion makes hydrated cementitious generate, than reducing, can not only improve the intensity of C-S-H gel component, and the cohesive strength of concrete substrate and interfacial transition zone is promoted all to some extent.
Meanwhile, toughening material of the present invention can by suppressing the germinating of tiny crack with the spacial framework of cement matrix, the present invention imitates steel fiber can by slowly extracting the energy discharging resisting crack extending gradually, the interface structure between imitative steel fiber-cement matrix, aggregate-cement matrix is improved while slowing down stress concentration, and then make imitative steel fiber need to overcome larger cohesive force in withdrawal process, obtain the long lifetime concrete with anti-fatigue performance, high tenacity and high cracking resistance with this.
Long lifetime of the present invention concrete 28d ultimate compression strength>=69.0MPa, 28d folding strength>=7.0MPa, 28d tensile splitting strength>=5.0MPa, 28d Young's modulus>=36.0GPa, cracking resistance grade reach L-IV grade, 56d chloride diffusion coefficient < 4.0 × 10
-12m
2/ s, 28d Bending toughness index I
20>=8.
(2) toughening material of the present invention absorb in concrete hydrated cementitious produce part calcium ion define the polymeric film with high-elastic high powerful feature, not only improve and gather materials-microscopic appearance of the interfacial transition zone of hardened cement paste and degree of compactness, and improve the cohesive strength of interfacial transition zone, make original in interfacial transition zone enrichment and the hydrolysis product of cement Ca (OH) of oriented growth
2the orientation of crystal weakens, grain-size refinement, and then plays the effect improving interface region degree of compactness.
(3) compared with steel fiber in prior art, the present invention adopts imitative steel fiber, and under same volume volume, imitative steel fiber weight is only 1/8 of steel fiber weight, and its cost is lower, is convenient to widely apply.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.
The long lifetime concrete for steel-mixed compound beam hogging moment area in the embodiment of the present invention, by mass parts, comprise 456 ~ 520 parts of gelling material, 1748 ~ 1813 parts gather materials, 0.80 ~ 1.50 part of imitative steel fiber, 2.05 ~ 2.86 parts of toughening materials, 4.10 ~ 5.72 parts of water reducers and 142 ~ 148 parts of water.
L-IV grade, 56d chloride diffusion coefficient < 4.0 × 10 is reached for steel-long lifetime concrete 28d ultimate compression strength>=69.0MPa, 28d folding strength>=7.0MPa, 28d tensile splitting strength>=5.0MPa, 28d Young's modulus>=36.0GPa of mixed compound beam hogging moment area, cracking resistance grade in the embodiment of the present invention
-12m
2/ s, 28d Bending toughness index I
20>=8.
Long lifetime concrete in the present embodiment, by mass parts, specifically comprise 487 parts of gelling material, 1782 parts gather materials, 1.00 parts of imitative steel fibers, 2.44 parts of toughening materials, 4.87 parts of water reducers and 146 parts of water.
Gelling material in the present embodiment, by mass parts, comprises 0.65 part of cement, 0.15 part of flyash and 0.20 part of slag powders; Cement adopts 52.5 grades of silicate cements, and flyash adopts I grade of flyash, and slag powders adopts S95 grade slag powder.
Gather materials by mass parts in the present embodiment, comprise 1 part of coarse aggregate and 0.64 part of fine aggregate; Coarse aggregate adopts particle diameter to be 5 ~ 20mm graded broken stone, and fine aggregate adopts nature medium sand.
Imitative steel fiber in the present embodiment is the vimentin filament of employing 100% polypropylene machine-shaping, diameter 0.80 ~ 1.2mm, length 30 ± 2mm, proportion 0.91 ~ 0.93g/cm
3, elongation at break 15% ~ 25%, tensile strength>=500MPa; Toughening material is a kind of organic polymer water-dispersion micro Nano material, and its key structure is the polyurethane ester structure of double bond end-blocking, 28d energy-to-break loss-rate > 160%; Water reducer adopts polycarboxylate high performance water-reducing agent, water-reducing rate>=25%; Hydromining tap water.
The long lifetime concrete preparation method for above-mentioned steel-mixed compound beam hogging moment area in the embodiment of the present invention, comprises the following steps:
S1: 456 ~ 520 parts of gelling material and 1748 ~ 1813 parts to be gathered materials by mass parts and add stirrer, by gelling material and the uniform stirring 30s that gathers materials, forwards step S2 to.
S2: be sprinkled into 0.80 ~ 1.50 part of imitative steel fiber in stirrer, by gelling material, to gather materials and imitative steel fiber stirs 30s jointly, forwards step S3 to.
S3: 4.10 ~ 5.72 parts of water reducers and 142 ~ 148 portions of aqueous fusions are closed and forms mixed solution; Successively mixed solution and 2.05 ~ 2.86 parts of toughening materials are added in stirrer, by gelling material, gather materials, imitative steel fiber, mixed solution and toughening material stir 3min jointly, obtains the pumpable concrete mix that the slump is 180 ~ 220mm.
Long lifetime concrete for steel-mixed compound beam hogging moment area of the present invention and preparation method thereof is illustrated below by 7 embodiments and 1 comparative example (embodiment 0 is that admixture does not imitate the comparative example of steel fiber and toughening material).
In embodiment 0 ~ 7, the quality proportioning of each component is as shown in table 1, embodiment 1 ~ 7 is the long lifetime concrete for steel-mixed compound beam hogging moment area in the present invention, embodiment 4 is for being applied to the theoretical proportioning of bridge deck concrete of ocean bridge construction entity steel-mixed compound beam hogging moment area, prediction can meet 120 years design service lifes, and all the other embodiments are the test proportioning of research.
The constituent mass proportioning table of table 1 embodiment 0 ~ 7
Gelling material in embodiment 1 ~ 7, by mass parts, comprises 0.65 part of China Resources cement (Pingnan County) company limited P II 52.5 silicate cement, F class I grade of flyash of 0.15 part of Zhenjiang type material branch office of Hua Yuan group, the S95 grade slag powder of 0.20 part of Tangshan Cao Fei Dian Dunshi building material company limited.
Gather materials by mass parts in embodiment 1 ~ 7, comprise 1 part of coarse aggregate and 0.64 part of fine aggregate.Coarse aggregate adopt Jiangmen newly continuous grading rubble that plain boiled water band stone field particle diameter is 5 ~ 20mm; Fine aggregate adopts the natural river sand in the Xijiang River, and fineness modulus is 2.9.
Imitative steel fiber in embodiment 1 ~ 7 adopts Tai'an companion's fiber company limited TB-30 organic synthesis vimentin filament, diameter 0.81mm, length 30mm, proportion 0.91g/cm
3, elongation at break 15.2%, tensile strength 503MPa; Toughening material adopts Jiangsu Subotexin Material Co., Ltd liquid
concrete in-situ toughening material, 28d energy-to-break loss-rate 179%; Water reducer adopts Shandong Huawei Jiancai Building Material Co., Ltd. NOF-AS polycarboxylate high performance water-reducing agent, water-reducing rate 29%; Hydromining tap water.
Carry out performance test to the concrete in embodiment 0 ~ 7 according to following test method standard below, the properties data drawn are as shown in table 2.
(1) ultimate compression strength: detect concrete crushing strength according to " standard for test methods of mechanical properties of ordinary concrete " GB/T50081-2002, sample dimensions is the cubes of 150mm × 150mm × 150mm.
(2) folding strength: detect concrete flexural strength according to " standard for test methods of mechanical properties of ordinary concrete " GB/T50081-2002, sample dimensions is the girder test specimen of 150mm × 150mm × 550mm.
(3) tensile splitting strength: detect concrete splitting tensile strength according to " standard for test methods of mechanical properties of ordinary concrete " GB/T50081-2002, sample dimensions is the cubes of 150mm × 150mm × 150mm.
(4) Young's modulus: detect modulus of elasticity of concrete according to " standard for test methods of mechanical properties of ordinary concrete " GB/T50081-2002, sample dimensions is the prism of 150mm × 150mm × 300mm.
(5) chloride diffusion coefficient: detect Chloride Diffusion Coefficient in Concrete according to " Standard for test methods of longterm performance and durability of ordinary concrete standard " GB/T50082-2009, sample dimensions is the right cylinder of Φ 100 × 50mm.
(6) Bending toughness index: detect concrete Bending toughness index according to " fibrous concrete test method standard " CECS13:2009, sample dimensions is the girder test specimen of 150mm × 150mm × 550mm.
(7) cracking resistance grade: evaluate cracking resistance grade according to " Standard for test methods of longterm performance and durability of ordinary concrete standard " GB/T50082-2009 and " concrete durability check evaluation criterion " JGJ/T193-2009, sample dimensions is the flat thin template test specimen of 800mm × 600mm × 100mm.
Table 2 embodiment 0 ~ 7 performance test data table
Can find out, embodiment 0 is compared with embodiment 1 ~ 7, the result data of 28d ultimate compression strength, 28d Young's modulus and 56d chloride diffusion coefficient is close, but the 28d folding strength in embodiment 1 ~ 7,28d tensile splitting strength, 28d Bending toughness index and cracking resistance grade are all far away higher than embodiment 0, embodiment 1 ~ 7 long lifetime, concrete bending tensile strength was high, resistance to cleavage and good toughness.
The present invention is not limited to above-mentioned embodiment, and for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications are also considered as within protection scope of the present invention.The content be not described in detail in this specification sheets belongs to the known prior art of professional and technical personnel in the field.
Claims (8)
1. the long lifetime concrete for steel-mixed compound beam hogging moment area, it is characterized in that: by mass parts, comprise 456 ~ 520 parts of gelling material, 1748 ~ 1813 parts gather materials, 0.80 ~ 1.50 part of imitative steel fiber, 2.05 ~ 2.86 parts of toughening materials, 4.10 ~ 5.72 parts of water reducers and 142 ~ 148 parts of water; Concrete 28d ultimate compression strength>=69.0MPa, 28d folding strength>=7.0MPa, 28d tensile splitting strength>=5.0MPa, 28d Young's modulus>=36.0GPa of described long lifetime, cracking resistance grade reach L-IV grade, 56d chloride diffusion coefficient < 4.0 × 10
-12m
2/ s, 28d Bending toughness index I
20>=8.
2. as claimed in claim 1 for the long lifetime concrete of steel-mixed compound beam hogging moment area, it is characterized in that: by mass parts, specifically comprise 487 parts of gelling material, 1782 parts gather materials, 1.00 parts of imitative steel fibers, 2.44 parts of toughening materials, 4.87 parts of water reducers and 146 parts of water.
3., as claimed in claim 1 or 2 for the long lifetime concrete of steel-mixed compound beam hogging moment area, it is characterized in that: described gelling material, by mass parts, comprises 0.65 part of cement, 0.15 part of flyash and 0.20 part of slag powders; Described cement adopts 52.5 grades of silicate cements, and described flyash adopts I grade of flyash, and described slag powders adopts S95 grade slag powder.
4., as claimed in claim 1 or 2 for the long lifetime concrete of steel-mixed compound beam hogging moment area, it is characterized in that: described in gather materials by mass parts, comprise 1 part of coarse aggregate and 0.64 part of fine aggregate; Described coarse aggregate adopts particle diameter to be 5 ~ 20mm graded broken stone, and described fine aggregate adopts nature medium sand.
5. as claimed in claim 1 or 2 for the long lifetime concrete of steel-mixed compound beam hogging moment area, it is characterized in that: described imitative steel fiber is the vimentin filament of employing 100% polypropylene machine-shaping, diameter 0.8 ~ 1.2mm, length 30 ± 2mm, proportion 0.91 ~ 0.93g/cm
3, tensile strength>=500MPa.
6. as claimed in claim 1 or 2 for the long lifetime concrete of steel-mixed compound beam hogging moment area, it is characterized in that: described toughening material is organic polymer water-dispersion micro Nano material, its key structure is the polyurethane ester structure of double bond end-blocking, 28d energy-to-break loss-rate > 160%.
7., as claimed in claim 1 or 2 for the long lifetime concrete of steel-mixed compound beam hogging moment area, it is characterized in that: described water reducer is polycarboxylate high performance water-reducing agent, water-reducing rate >=25%.
8., for the long lifetime concrete preparation method for steel-mixed compound beam hogging moment area described in any one of claim 1 to 7, it is characterized in that, comprise the following steps:
S1: 456 ~ 520 parts of gelling material and 1748 ~ 1813 parts to be gathered materials by mass parts and add stirrer, by gelling material and the uniform stirring 30s that gathers materials, forwards step S2 to;
S2: be sprinkled into 0.80 ~ 1.50 part of imitative steel fiber in stirrer, by gelling material, to gather materials and imitative steel fiber stirs 30s jointly, forwards step S3 to;
S3: 4.10 ~ 5.72 parts of water reducers and 142 ~ 148 portions of aqueous fusions are closed and forms mixed solution; Successively mixed solution and 2.05 ~ 2.86 parts of toughening materials are added in stirrer, by gelling material, gather materials, imitative steel fiber, mixed solution and toughening material stir 3min jointly, obtains 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 |
| CN108147734A (en) * | 2016-12-06 | 2018-06-12 | 北京新桥技术发展有限公司 | A kind of high tenacity deck paving fiber concrete and preparation method thereof |
| CN108546030A (en) * | 2018-04-23 | 2018-09-18 | 中铁大桥局集团有限公司 | The high-strength concrete and preparation method thereof that a kind of gel material content is low, easily pumps |
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