CN108164213A - A kind of filling layer self-compacting concrete frozen for severe cold area anti-ice with dynamic load coupling - Google Patents
A kind of filling layer self-compacting concrete frozen for severe cold area anti-ice with dynamic load coupling Download PDFInfo
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- CN108164213A CN108164213A CN201711376516.6A CN201711376516A CN108164213A CN 108164213 A CN108164213 A CN 108164213A CN 201711376516 A CN201711376516 A CN 201711376516A CN 108164213 A CN108164213 A CN 108164213A
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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
- 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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a kind of for severe cold area anti-ice jelly and the filling layer self-compacting concrete of dynamic load coupling.The filling layer self-compacting concrete is by Portland cement, complex mineral blending material, deformation regulation and control component, workability improves component, durability ensures that component, water, sandstone aggregate component are formed, and the strength grade of 56d is C40.After 300 Frozen-thawed cycleds act on, compression strength loss rate is less than or equal to 40%, mass loss rate no more than 25%, Determination of Dynamic Elastic Modulus loss late and is less than or equal to 2.3% the filling layer self-compacting concrete；For the filling layer self-compacting concrete after 100,000 times freeze bending load coupling, loss rate of flexural strength is less than or equal to 10%.Self-compacting concrete of the present invention freezes for severe cold area anti-ice and has good resistance Frozen-thawed cycled under the conditions of dynamic loading and freeze the ability of curved drawing fatigue load coupling, the damage of severe cold and frost region freeze injury and load coupling to concrete structures such as high-speed railway filling layers can effectively be mitigated, the service life of ballastless track structure is improved, Technological Economy effect is notable.
Description
Technical field
The invention belongs to civil engineering material technical fields, and in particular to one kind is frozen for severe cold area anti-ice and dynamic load is made
Ballastless track of high-speed railway filling layer self-compacting concrete under the conditions of.
Background technology
China Railway High-speed is quickly grown in last decade, by the end of the year 2016, high-speed railway total kilometrage up to 2.2 ten thousand kilometers,
The 65% of world's total kilometrage is accounted for, the CRTS type III platy ballastless track structures with independent intellectual property right have evolved into
It is as filling layer material using self-compacting concrete for one of the primary trace structural shape of China Railway High-speed, distinguishing feature
Material, plays support adjustment, limiting control, and the ride comfort and safety to high speed rail train operation are most important [1].I
State is vast in territory, and the rapid development of high-speed rail technology makes it gradually extend to the seasonal frost such as Northeast China, northwest and salt
Frozen ground area.In these areas, reachable -20 DEG C of temperature in winter, and periods of months [2], while China express railway also by
It gradually goes abroad, particularly builds not click high ferro in Russia, these region temperatures are extremely low.High speed railway track it is very much
Crucial concrete member, such as self-compacting concrete filling layer, all can by the frost action of the dynamic load and subzero temperature environment of train,
The endurance quality of component to high-speed railway including self-compacting concrete filling layer is caused shadow by this harsh environmental conditions
It rings.Therefore, research and development are highly desirable to mix with the filling layer self-compaction that can resist subzero temperature frost and DYNAMIC LOADING OF DRIVING TRAIN ON BRIDGES coupling
Solidifying soil.
At present, although there are many domestic and foreign scholars to carry out numerous studies to the frost resistance of concrete, show Frozen-thawed cycled
Effect causes to seriously affect to concrete durability；In ice conditions, it due to the internal water freezing filling pore of concrete soil, mixes
Though the static mechanical property of solidifying soil material can obtain certain raising [3-6], under dynamic load and Frozen-thawed cycled effect, mix
The mechanical property for coagulating soil will appear significantly deterioration [7-12], bigger than the degradation speed under single Frozen-thawed cycled effect.Some
Researcher also attempts to recycle the performance [13- destroyed using the methods of adding of fiber, air entraining agent to improve the freeze thawing resistance of concrete
, but effect or limited 14]；Particularly, under long-time frost-dynamic load coupling, endurance performance of concrete is ground
Study carefully and also have not been reported substantially, from the point of view of the existing practice in China, concrete has occurred in a short time under frost-Under Dynamic Load
Apparent surface layer peeling destroys (such as Fig. 1), how to improve severe cold area subzero temperature frost-lower concrete of Train induced load effect
Endurance quality has become a major challenge that China express railway construction faces.
In consideration of it, the present invention intends on the basis of correlative study, for high-speed railway CRTSIII plate-type non-fragment orbit knots
Structure feature and severe cold area Service Environment condition have developed a kind of be used for excellent anti-severe cold area frost and dynamic load work
Filling layer self-compacting concrete.
Leading reference
[1]Yuan Q,Long G,Liu Z,et al.Sealed-space-filling SCC:A special SCC
applied in high-speed rail of China[J].Construction&Building Materials,2016,
124:167-176.
[2]Zhang X,Wang L,Zhang J.Mechanical behavior and chloride
penetration of high strength concrete under freeze-thaw attack[J].Cold
Regions Science&Technology,2017.
[3] Zhang Nan, Li Jingfang, Zhang Zhiming wait ultra-low temperature surroundings concrete research and application summary [J] concrete,
2012(12):27-29.
[4] Jiang Zhengwu, Li Xiongying, high-strength mortar strength development [J] silicate journals under nanmu ultralow temperature, 2011,39
(4):703-707.
[5]Montejo L A,Asce S M,Sloan J E,et al.Cyclic Response of Reinforced
Concrete Members at Low Temperatures[J].Journal of Cold Regions Engineering,
2008,22(3):79-102.
[6]Xie J,Li X,Wu H.Experimental study on the axial-compression
performance of concrete at cryogenic temperatures[J].Construction&Building
Materials,2014,72(72):380-388.
[7] influence [J] civil engineering journals that scholar rises Freezing-thawing Cycles On Mechanical Properties of Concrete, 1997 (4) are applied:35-
42.
[8] Zhang Shiping, Deng Min, Tang Ming state concrete Frozen-thawed cycleds damage study progress [J] Materials Science and Engineerings
Report, 2008 (6):990-994.
[9]Li W,Sun W,Jiang J.Damage of concrete experiencing flexural
fatigue load and closed freeze/thaw cycles simultaneously[J].Construction&
Building Materials,2011,25(5):2604-2610.
[10]Qiao Y,Sun W,Jiang J.Damage process of concrete subjected to
coupling fatigue load and freeze/thaw cycles[J].Construction&Building
Materials,2015,93:806-811.
[11] Tian Lizong, Lu Jing Zhou, Zhu Kongfeng wait Frozen-thawed cycleds to be studied with concrete damage under Fatigue Load
Institute of [J] Changjiang Academy of sciences reports, and 2017.
[12]Gong F,Ueda T,Wang Y,et al.Mesoscale simulation of fatigue
behavior of concrete materials damaged by freeze-thaw cycles[J].Construction&
Building Materials,2017,144:702-716.
[13]Jang J G,Kim H K,Kim T S,et al.Improved flexural fatigue
resistance of PVA fiber-reinforced concrete subjected to freezing and thawing
cycles[J].Construction&Building Materials,2014,59(59):129-135.
[14] Zhao Xiaolong, Wei Jun, topaz be full of Freeze-thaw Durability of Concrete deterioration with pore structure variation relationship [J] Wuhan
Polytechnics's journal, 2002,24 (12):14-17.
Invention content
The technical problem to be solved in the present invention is to provide one kind in severe cold frost region, have excellent resistance frost and dynamic
Load coupling, the filling layer self-compacting concrete for meeting the operation of High Speed Railway Trains safety and steady.
A kind of filling layer self-compacting concrete frozen for severe cold area anti-ice with dynamic load coupling of the present invention,
The strength grade of the filling layer self-compacting concrete 56d is C40；And 56d flexural strengths are more than or equal to 6.0MPa；
After 300 Frozen-thawed cycleds act on, compression strength loss rate is less than or equal to the filling layer self-compacting concrete
25%th, it is preferably less than and is equal to 22%；Determination of Dynamic Elastic Modulus loss late is less than or equal to 30%, is preferably less than equal to 15%, quality damage
Mistake rate is less than or equal to 3%, is preferably less than equal to 2.3%；During 300 Frozen-thawed cycleds effect, freezing temperature is -20 DEG C；
After 100,000 times freeze fatigue test, loss rate of flexural strength is less than or equal to the filling layer self-compacting concrete
10%.
A kind of filling layer self-compacting concrete frozen for severe cold area anti-ice with dynamic load coupling of the present invention, it is described
The strength grade of filling layer self-compacting concrete 56d ages is C40, and mixture divergence is 600~660mm, T500Time is 4
~8s, J rings height difference is less than 20mm, air content is 5~9%.
Preferably, the present invention is a kind of freezes and the filling layer of dynamic load coupling is from close for severe cold area anti-ice
Real concrete, every cube of concrete is raw materials used to be：
Cement 340-360Kg, preferably 350kg；
Complex mineral blending material 110-130Kg, preferably 120kg；
Deformation regulation and control component 42-46Kg, preferably 45kg；
Workability improves component 5-7Kg, preferably 6kg；
Durability ensures component 4-6Kg, preferably 5kg；
Water 170-180Kg, preferably 175kg；
River sand 830-870Kg, preferably 850kg；
Lime stone 800-830Kg；Preferably 810kg；
The complex mineral blending material is by I grades of Class F fly ash, S95 slag powders, metakaolin is compound forms；
The deformation regulation and control component is made of II types swelling agent, polyoxyethylene alkyl ether class economization agent；
The workability improves component and is made of High Efficient Diswater, carboxymethyl cellulose, calcium-base montmorillonite；
The durability ensures that component is composed of lignin, rubber grain, air entraining agent, the siliceous powder of nanometer.
Using the filling layer self-compacting concrete of above-mentioned technical proposal, worked according to filling layer autodensing concrete almixture
Property, the 3 aspect requirements such as morphotropism and durability set out, it is micro- from raw material compositional optimization compatibility and inside with holism method
Microscopical structure drag is promoted angularly, and with reference to experimental test result, and preferred development characteristic component is molded work by " self-compaction "
Skill technology designs the phase of gathering materials, slurry phase and a slurry interfacial transition zone phase of gathering materials of concrete, so as to fulfill concrete anti-ice
Freeze and the guarantee of dynamic load coupling performance, thus invention are suitable for the filling layer of severe cold area anti-ice jelly-dynamic loading
Self-compacting concrete.
Preferably, the present invention is a kind of freezes and the filling layer of dynamic load coupling is from close for severe cold area anti-ice
Real concrete, the filling layer self-compacting concrete are made of slurry system and system of gathering materials, slurry and collection in folk prescription concrete
It is 0.37 to expect volume ratio：0.40 preferably 0.38：0.62, the slurry is by cement, complex mineral blending material, deformation regulation and control group
Part, workability improve component, durability ensures component, water is formed；System of gathering materials is made of river sand and lime stone.
Preferably, the present invention is a kind of freezes and the filling layer of dynamic load coupling is from close for severe cold area anti-ice
Real concrete,
The cement is 42.5 Portland cements of P.O；
The river sand is the river sand of II areas grading that fineness modulus is 2.5~3.0；
The grain size of the lime stone is 5~16mm.
Preferably, the present invention is a kind of freezes and the filling layer of dynamic load coupling is from close for severe cold area anti-ice
Real concrete, the complex mineral blending material are pressed by I grades of Class F fly ash, S95 slag powders and 1000-1200 mesh metakaolins
Mass ratio is 40:40:20 compositions.
Preferably, the present invention is a kind of freezes and the filling layer of dynamic load coupling is from close for severe cold area anti-ice
Real concrete, the deformation regulation and control component are 98 in mass ratio by II types swelling agent and polyoxyethylene alkyl ether class economization agent:2 groups
Into.
Preferably, the present invention is a kind of freezes and the filling layer of dynamic load coupling is from close for severe cold area anti-ice
Real concrete, the workability improve component by powder type High Efficient Diswater of the water-reducing rate for 35%, carboxymethyl cellulose
Element, calcium-base montmorillonite are 50 in mass ratio:10:40 compositions.
Preferably, the present invention is a kind of freezes and the filling layer of dynamic load coupling is from close for severe cold area anti-ice
Real concrete, the durability ensure component by lignin, 100-120 mesh waste and old rubber particle, air entraining agent, the siliceous powder of nanometer
It is 10 in mass ratio:60:1:30 compositions.
The application process of the present invention：Each raw material are weighed according to proportioning, by river sand, lime stone rubble, cement, compound
Mineral admixture, deformation regulation and control component and workability improve component, durability ensures the siccatives such as component input forced mixer
In, then premixing 30 seconds adds in the liquid compositions such as water, continue stir about 150 seconds, and mixture goes out machine, examine mixture " from close
Reality " (including slump flow test, T500 times, J ring height differences etc.), confirmation meet corresponding performance, are then molded corresponding property
Test specimen can be tested and carry out corresponding application practice.
The present invention is based on the heightened awareness to frost and dynamic load Under Concrete material damage degradation mechanism, is based on
Anatomy to the composition of concrete material, structure and property relationships principle is mixed with reference to each organic and inorganic component in self-compaction
Effect and correlation in solidifying this special system of soil, by adjusting admixture and admixture dosage, and using " self-compaction into
Type technique " is without passing through tradition machinery vibration compacting technique so that each component is uniformly distributed in systems, forms lime stone, sand
The skeletal support system of composition, the filling system of hardened paste, the stress buffer system of micro/nano level dead-end pore optimize certainly
Air-free concrete forms and micropore structure, so as to obtain with excellent construction working, higher force intensity, excellent anti-ice
Freeze and the filling layer self-compacting concrete of dynamic load Europe cooperation, formation are of the invention.Thus the scientific basis of the present invention is abundant.
During researching and developing this and freezing the filling layer self-compacting concrete with dynamic loading for severe cold area anti-ice, into
It has gone a large amount of Test And Research Work, by the adjustment to different key components, has been finally obtained the filling with target capabilities
Layer self-compacting concrete.It is matched with reference to type testing as shown in Table 1, according to related specifications method, prepares corresponding test specimen, respectively
Test intensity (150mm × 150mm × 150mm cube specimens), anti-freezing property (100mm × 100mm × 300mm prisms
Test specimen (for freezing and thawing test, subzero temperature frost-dynamic load fatigue test and flexural strength experiment), is compared based on analysis of experiments
Normal concrete, traditional self-compacting concrete, the self-compacting concrete for mixing swelling agent and filling layer self-compaction of the invention mix
Coagulate the mechanical property after the working performance, compression strength, Frozen-thawed cycled of soil, the mechanical property after frost fatigue；On this basis
The present invention is obtained for severe cold area anti-ice to freeze and the best raw material of the filling layer self-compacting concrete of dynamic loading composition.
Therefore, the present invention has sufficient experimental study basis and foundation, validity and feasibility are good, it is effectively guaranteed that filling layer from
The anti-ice of air-free concrete is frozen and dynamic load coupling makees have being obviously improved for performance.
In order to solve the above technical problems, filling layer self-compacting concrete provided by the invention, it is characterized in that：By P.O 42.5
Portland cement, complex mineral blending material, deformation regulation and control component and workability improve component, durability ensures component, mixes
The components structures such as the lime stone rubble of Heshui, the II areas grading river sand, grain size that fineness modulus is 2.5~3.0 between 5~16mm
Into.Material utilization amount is 350kg cement in every cube of concrete, 120kg complex mineral blending materials, 45kg deformation regulate and control component, 6kg
Workability improves component, 5kg durabilities ensure component, 175kg mixing waters, 850kg river sands and 810kg lime stone rubbles.This hair
Bright filling layer self-compacting concrete strength grade is C40 (56d ages), and mixture divergence is in (630 ± 30) mm, T500Time
It is less than 20mm, air content between (7 ± 2) % in (6 ± 2) s, J- ring height difference.
The advantages and positive effects of the present invention：
1. filling layer self-compacting concrete provided by the invention meet mix working performance and basic mechanical performance will
While asking, there is the excellent performance for resisting Frozen-thawed cycled, frost and dynamic load, ensure that high-speed railway plate type ballastless track
Military service of the filling layer in severe cold and seasonal freezing region is safe, extends the service life of self-compaction filling layer.
2. filling layer self-compacting concrete provided by the invention is using self-compaction moulding process, construction technology is simple, operates
Conveniently, reliability is high, good with green and economic traits, comprehensive benefit.
It is to sum up shown, the present invention be it is a kind of can significantly improve agent on crack resistance of concrete frost and dynamic load coupling performance from close
Real concrete can meet the performance requirement of the high-speed railway filling layer in severe cold and frost region military service, have fine well
Technological Economy effect.
Description of the drawings
Fig. 1 is the concrete deterioration photo runed under frost-DYNAMIC LOADING OF DRIVING TRAIN ON BRIDGES effect 4 years.
Fig. 2 is that (a) slump extension of filling layer autodensing concrete almixture prepared by embodiment and (b) J ring tests shine
Piece.
Fig. 3 is the fatigue loading photo and schematic diagram of concrete prepared by specific embodiment in ice conditions.
Fig. 4 is the Protonation constant schematic diagram of concrete frost fatigue prepared by specific embodiment.
Fig. 5 is NC concrete prepared by comparative example in room temperature (20 DEG C), frost (- 20 DEG C) and freezes anti-under fatigue condition
Roll over stress-strain diagram (note：Strain stress tension is positive value, is pressurized as negative value).
Fig. 6 is SCC1 concrete prepared by comparative example under room temperature (20 DEG C), frost (- 20 DEG C) and frost fatigue condition
Anti- folding stress-strain diagram (note：Strain stress tension is positive value, is pressurized as negative value).
Fig. 7 is SCC2 concrete prepared by comparative example under room temperature (20 DEG C), frost (- 20 DEG C) and frost fatigue condition
Anti- folding stress-strain diagram (note：Strain stress tension is positive value, is pressurized as negative value).
Fig. 8 is SCC3 concrete prepared by the embodiment of the present invention in room temperature (20 DEG C), frost (- 20 DEG C) and the tired item of frost
Anti- folding stress-strain diagram (note under part：Strain stress tension is positive value, is pressurized as negative value).
Fig. 9 is stress-strain diagram of the NC concrete after Frozen-thawed cycled prepared by comparative example.
Figure 10 is stress-strain diagram of the SCC1 concrete after Frozen-thawed cycled prepared by comparative example.
Figure 11 is stress-strain diagram of the SCC2 concrete after Frozen-thawed cycled prepared by comparative example.
Figure 12 is stress-strain diagram of the SCC3 concrete after Frozen-thawed cycled prepared by the embodiment of the present invention.
Figure 13 is the dynamic modulus of elasticity of each concrete of gained after Frozen-thawed cycled in the specific embodiment of the invention
Loss late figure.
Figure 14 is mass loss rate figure of each concrete of gained after Frozen-thawed cycled in the specific embodiment of the invention.
Specific embodiment
Following embodiment is intended to illustrate invention rather than limitation of the invention further.
In the embodiment of the present invention and comparative example：
The complex mineral blending material is pressed for I grades of Class F fly ash, S95 slag powders and 1000-1200 mesh metakaolins
Mass ratio 40:40:20 are formed；
The deformation regulation and control component is by II types swelling agent and polyoxyethylene alkyl ether class economization agent in mass ratio 98:2 are formed；
It is 35% High Efficient Diswater, carboxymethyl cellulose, calcium that described and workability, which improves component by water-reducing rate,
Base montmorillonite in proportion 50:10:40 are formed；
The durability ensures component by lignin, 100-120 mesh waste and old rubber particle, air entraining agent, the siliceous powder of nanometer
In mass ratio 10:60:1:30 are formed；
Filling layer self-compacting concrete is made of slurry system and system of gathering materials, slurry and volume of gathering materials in folk prescription concrete
Than being 0.38：0.62, slurry is by cement, complex mineral blending material, deformation regulation and control component, workability improves component, durability is protected
Hinder component, mixing water is formed；System of gathering materials is made of high-quality II areas river sand and 5~16mm continuous grading fat lime stone rubbles.
It is raw materials used with Example and comparative example by the ingredient that table 1 is set；Using NC, SCC1；SCC2, SCC3 to its into
Row number, wherein NC are normal concrete, SCC1 is No. 1 traditional self-compacting concrete, SCC2 be No. 2 tradition for mixing swelling agent from
The filling layer self-compacting concrete that air-free concrete, SCC3 are developed by the embodiment of the present invention, SCC4 and SCC5 are mixed for filling layer
Coagulate two groups of comparative examples of soil.
Match ratio example (the unit of the different concrete of table 1：kg/m3)
As shown in table 1, in the present embodiment, it is C40 that each concrete sample component parameter, which is chosen by design strength grade,
Carry out, NC normal concretes are normal pump concrete, and the design slump is 130 ± 20mm, SCC1 for it is traditional do not consider it is swollen
Bulging deformation and the self-compacting concrete for reaching I grade filling performances of Frost Resistance requirement, SCC2 are consideration dilatancy but not
Consider the self-compacting concrete for reaching I grades of filling layer performances of Frost Resistance, considered based on the requirement of filling layer performance design perpendicular
To dilatancy, Frost Resistance requirement and design tri- groups of SCC3~SCC5, wherein SCC3 be optimum ratio, every cube of coagulation
Material utilization amount is 350kg cement in soil, 120kg complex mineral blending materials, 45kg deformation regulate and control component, 6kg workability improvement groups
Part, 5kg durabilities ensure component, (170-180) kg mixing waters, 860kg river sands and 810kg lime stone rubbles, SCC4 and SCC5
For comparative example, influence of the variation of glue material, aggregate quantity and key component material to performance is considered.Filling layer of the present invention is from close
Real strength grade of concrete is C40 (56d ages), and mixture divergence is in (630 ± 30) mm, T500Time is in (6 ± 2) s, J-
Ring height difference is less than 20mm, air content between (7 ± 2) %.
Preparation method is：Each number sample prepares raw material and and other preparations by the amount of 30L.
By river sand, lime stone rubble, cement, complex mineral blending material, deformation regulation and control component and workability improve component,
Durability ensures in the siccatives such as component input forced mixer then premixing 30 seconds adds in the liquid compositions such as water, water-reducing agent,
Continue stir about 150 seconds, the mixture stirred evenly is gone out into machine, test mixture working performance (including " self compacting ability ") is full
After sufficient workability requirement, it is molded the test specimen of corresponding size.The test specimen of forming is first quiet under normal environment conditions, and to stop maintenance 24 small
When, then form removal, and test specimen is moved in standard curing room, maintenance is to 28d or 56d under standard environment disposed within, and test is often
The indexs such as corresponding concrete crushing strength, flexural strength under warm (20 DEG C).Test result is as shown in table 2.Corresponding test specimen is satisfied
Water-ice freezes 3d, takes out test frost and the Frozen-thawed cycled under dynamic load and the mechanical property after frost fatigue, test result such as table 3
It is shown.Filling layer autodensing concrete almixture photo is as shown in Fig. 2, the fatigue loading photo of each concrete in ice conditions
((a), (b)) and schematic diagram (c) are as shown in Figure 3.Concrete freezes the Protonation constant of fatigue as shown in figure 3, each concrete is normal
As viewed in figures 5-8, each concrete passes through anti-folding stress-strain diagram under warm (20 DEG C), frost (- 20 DEG C) and frost fatigue condition
As shown in figs9-12, each concrete is through different freezing-thawing cycles for dynamic modulus of elasticity loss late after different freezing-thawing cycles
Mass loss rate afterwards is as shown in figure 13.
Table 2 surveys the mix physical performance of above-mentioned each concrete sample and mark supports lower 56d intensity results
By the result in table 2 it is found that prepared NC normal concretes have reached the design slump and design compression strength
Class requirement, but due to not mixing expansion component, the vertical expansion ratio tested is negative, that is, shows as shrinking.SCC1 is also full
The required mixture workability requirement of foot design and compression strength requirement, but its vertical expansion ratio is also negative, and air content is only
It is 4.5%.SCC2 meets the mix physical performance of design and compression strength requirement, and vertical expansion ratio 0.9%, air content reaches
5.6%.The mix physical performance and compression strength of SCC3 filling layer samples are satisfied by design requirement, and especially flexural strength reaches
6.5MPa, higher than other groups, and vertical expansion ratio is 0.7%, air content 7.2%.And SCC4 groups are due to expansion component volume
It is relatively low, and sand content is higher etc. so that its vertical expansion ratio is smaller, and flexural strength is relatively low, SCC5 groups due to with it is easy
Property improve that component is less, water consumption is larger, and expansion component is more so that its divergence is bigger than normal, vertical expansion ratio is bigger than normal, it is difficult to
Meet filling layer pouring construction quality requirement.
Table 3 surveys the results of property after above-mentioned each concrete Frozen-thawed cycled and frost fatigue
Table 3 is tested obtained results of property and is shown：NC, SCC1 and SCC2 group, the resistance to compression after 300 Frozen-thawed cycleds act on
Loss of strength rate is more than 25%, and mass loss rate is also bigger than normal, can not meet the performance for resisting 300 Frozen-thawed cycled effects, SCC4
It is also bigger than normal with compression strength loss rate of the two groups of samples of SCC5 after 300 Frozen-thawed cycleds act on and dynamic modulus loss late,
Loss rate of flexural strength particularly after 100,000 frosts-load coupling uses the present invention (SCC3 also greater than 10%
Match ratio) loss of strength rate of the self-compacting concrete after 300 Frozen-thawed cycleds, Determination of Dynamic Elastic Modulus loss late, mass loss rate,
Loss of strength rate after 100,000 frost fatigue is equal and significantly better than normal concrete and other self-compacting concretes, while from
From the point of view of the 56 days compression strength surveyed, filling layer self-compacting concrete strength of the invention, flexural strength up to 40MPa and
6.5MPa meets the intensity requirement of ballastless track of high-speed railway filling layer self-compacting concrete, while it can also meet well
In the performance requirement of high-speed railway filling layer that severe cold and frost region are on active service.
Claims (10)
1. a kind of filling layer self-compacting concrete frozen for severe cold area anti-ice with dynamic load coupling, it is characterised in that；
The strength grade of the filling layer self-compacting concrete 56d is C40；And 56d flexural strengths are more than or equal to 6.0MPa；
The filling layer self-compacting concrete after 300 Frozen-thawed cycleds act on, compression strength loss rate is less than or equal to 25%,
Determination of Dynamic Elastic Modulus loss late is less than or equal to 30%, mass loss rate and is less than or equal to 3.0%；When 300 freeze thawing follow effect, frost
Temperature is -20 DEG C, 3 hours Frozen-thawed cycled cycle time；
After 100,000 times freeze fatigue test, loss rate of flexural strength is less than or equal to the filling layer self-compacting concrete
10%.
2. a kind of severe cold area anti-ice that is used for according to claim 1 is frozen with the curved filling layer for pulling load coupling certainly
Air-free concrete, it is characterised in that；The strength grade of the filling layer self-compacting concrete 56d ages is C40, and mixture extends
It spends for 600~660mm, T500Time is 4~8s, J rings height difference is less than 20mm, air content is 5~9%.
3. a kind of filling layer self-compaction frozen for severe cold area anti-ice with dynamic load coupling according to claim 1
Concrete, it is characterised in that；Every cube of concrete is raw materials used to be：
Portland cement 340-360Kg；
Complex mineral blending material 110-130Kg；
Deformation regulation and control component 42-46Kg；
Workability improves component 5-7Kg；
Durability ensures component 4-6Kg；
Water 170-180Kg；
River sand 830-870Kg；
Lime stone 800-830Kg；
The complex mineral blending material is by I grades of Class F fly ash, S95 slag powders, metakaolin is compound forms；
The deformation regulation and control component is made of II types swelling agent, polyoxyethylene alkyl ether class economization agent；
The workability improves component and is made of High Efficient Diswater, carboxymethyl cellulose, calcium-base montmorillonite；
The durability ensures that component is composed of lignin, rubber grain, air entraining agent, the siliceous powder of nanometer.
4. a kind of filling layer self-compaction frozen for severe cold area anti-ice with dynamic load coupling according to claim 3
Concrete, it is characterised in that；
Every cube of concrete is raw materials used to be：
Portland cement 350kg；
Complex mineral blending material 120kg；
Deformation regulation and control component 45kg；
Workability improves component 6kg；
Durability ensures component 5kg；
Water 175kg；
River sand 850kg；
Lime stone 810kg；
The complex mineral blending material is by I grades of Class F fly ash, S95 slag powders, metakaolin is compound forms；
The deformation regulation and control component is made of II types swelling agent, polyoxyethylene alkyl ether class economization agent；
The workability improves component and is made of High Efficient Diswater, carboxymethyl cellulose, calcium-base montmorillonite；
The durability ensures that component is composed of lignin, rubber grain, air entraining agent, the siliceous powder of nanometer.
5. a kind of filling layer self-compaction frozen for severe cold area anti-ice with dynamic load coupling according to claim 3
Concrete, it is characterised in that；
The filling layer self-compacting concrete is made of slurry system and system of gathering materials, slurry and volume of gathering materials in folk prescription concrete
Than for 0.37-0.40：0.63-0.60, the slurry are improved by cement, complex mineral blending material, deformation regulation and control component, workability
Component, durability ensure that component, water are formed；System of gathering materials is made of river sand and lime stone.
6. a kind of according to the claim 3-5 any one is frozen for severe cold area anti-ice and dynamic load coupling is filled
Packing course self-compacting concrete, it is characterised in that；
The cement is 42.5 Portland cements of P.O；
The river sand is the river sand of II areas grading that fineness modulus is 2.5~3.0；
The grain size of the lime stone is 5~16mm.
7. a kind of according to the claim 3-5 any one is frozen for severe cold area anti-ice and dynamic load coupling is filled
Packing course self-compacting concrete, it is characterised in that：The complex mineral blending material by I grades of Class F fly ash, S95 slag powders and
1000-1200 mesh metakaolin in mass ratio 40:40:20 compositions.
8. a kind of according to the claim 3-5 any one is frozen for severe cold area anti-ice and dynamic load coupling is filled
Packing course self-compacting concrete, it is characterised in that；The deformation regulation and control component is subtracted by II types swelling agent and polyoxyethylene alkyl ether class
Contracting agent is 98 in mass ratio:2 compositions.
9. a kind of according to the claim 3-5 any one is frozen for severe cold area anti-ice and dynamic load coupling is filled
Packing course self-compacting concrete, it is characterised in that；It is high by the powder type carboxylic serials that water-reducing rate is 35% that the workability improves component
Imitate water-reducing agent, carboxymethyl cellulose, calcium-base montmorillonite in mass ratio 50:10:40 compositions.
It is 10. a kind of for severe cold area anti-ice jelly and dynamic load coupling according to claim 3-5 any one
Filling layer self-compacting concrete, it is characterised in that；The durability ensures component by lignin, 100-120 mesh waste olds
The siliceous powder of grain, air entraining agent, nanometer in mass ratio 10:60:1:30 compositions.
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| CN115947577A (en) * | 2023-02-14 | 2023-04-11 | 南通市建设混凝土有限公司 | Self-compacting anti-freezing concrete and preparation process thereof |
| CN115947577B (en) * | 2023-02-14 | 2023-11-14 | 南通市建设混凝土有限公司 | Self-compacting anti-freezing concrete and preparation process thereof |
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