CN109626886A - Steel Fiber Reinforced Self-compacting Concrete mixing proportion design method based on mortar rheological behavior - Google Patents
Steel Fiber Reinforced Self-compacting Concrete mixing proportion design method based on mortar rheological behavior Download PDFInfo
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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
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- G—PHYSICS
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- 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
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00198—Characterisation or quantities of the compositions or their ingredients expressed as mathematical formulae or equations
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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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Abstract
The invention discloses a kind of Steel Fiber Reinforced Self-compacting Concrete mixing proportion design methods based on mortar rheological behavior, including establish steel fiber reinforced concrete divergence SF prediction model；It is required to determine water-cement ratio, cementitious material ratio according to strength grade of concrete, and determines self-compaction concrete mortar match ratio；Using yield stress, the plastic viscosity of rotation ball test mortar, the mortar yield stress of actual measurement is updated to the divergence etc. that steel fiber reinforced concrete divergence SF surveys prediction steel fiber reinforced concrete in model；It is higher to design precision, closer to reality, optimization and Properties Control to component can be preferably being completed in material selection process, master-plan step and clear thinking, it is easy to operate rationally, it avoids the blindness in prior art operation, reduce because trial adjustment brings time, manpower, material and energy waste repeatedly, thus there is better operability and practicability.
Description
Technical field
The present invention relates to architectural engineering technical field of concrete, in particular to the steel fibre based on mortar rheological behavior is from close
Real concrete mixing proportion design method.
Background technique
Steel Fiber Reinforced Self-compacting Concrete is a kind of composite material, has very high mobility, without vibrating the case where
Lower to rely on self gravity filling template gap, the Steel Fiber Reinforced Self-compacting Concrete after hardening can use the enhancing increasing of steel fibre
Tough effect improves the intensity of concrete, therefore Steel Fiber Reinforced Self-compacting Concrete has excellent workability and tough characteristic.At present
For Steel Fiber Reinforced Self-compacting Concrete mixing proportion design method there is no clearly stipulate that in the prior art, to steel fibre self-compaction
The research of concrete mixing proportion design method is relatively fewer, Steel Fiber Reinforced Self-compacting Concrete mixing proportion design method used, certainly
It is isometric or specific surface areas is waited to replace coarse aggregate method that steel fibre, steel fibre are directly incorporated on the basis of air-free concrete.This method
In the steel fibre that can satisfy certain parameter, but the coarse aggregate that replaces can make the mechanical property of concrete change.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of Steel Fiber Reinforced Self-compacting Concretes based on mortar rheological behavior
Mixing proportion design method can preferably complete optimization and Properties Control to component in material selection process, totally set
Step counting is suddenly and clear thinking, easy to operate reasonable, avoids the blindness in prior art operation, reduces because of trial tune repeatedly
It is whole to bring time, manpower, material and energy waste, thus there is better operability and practicability.
A kind of Steel Fiber Reinforced Self-compacting Concrete mixing proportion design method based on mortar rheological behavior of the invention, including with
Lower step:
A. steel fiber reinforced concrete divergence SF prediction model is established, model is as follows:
Wherein, ξ≤1 indicates folding
Subtract coefficient；A, b and c is constant, indicates to be fitted the relation value being superimposed between rheology and working performance；L and D respectively indicates steel fibre
The length and diameter of dimension；The impact factor of A expression steel fibre；τmIndicate mortar yield stress；φ indicates that the volume of steel fibre is mixed
Amount；
B. it is required to determine water-cement ratio, cementitious material ratio according to strength grade of concrete, and determines self-compaction concrete mortar
Match ratio；
C. using yield stress, the plastic viscosity of rotation ball test mortar, the mortar yield stress of actual measurement is updated to
Steel fiber reinforced concrete divergence SF surveys in model the divergence for predicting steel fiber reinforced concrete；
D. the steel fiber reinforced concrete divergence of prediction, mortar plastic viscosity and the Steel Fiber Reinforced Self-compacting Concrete of setting are expanded
Minimum plastic viscosity needed for latitude of emulsion threshold range, mortar is compared, if the steel fiber reinforced concrete divergence of prediction is being set
Steel Fiber Reinforced Self-compacting Concrete divergence threshold range in and mortar plastic viscosity meet the requirements, then enter in next step, if
The steel fiber reinforced concrete divergence of prediction is then readjusted outside the Steel Fiber Reinforced Self-compacting Concrete divergence threshold range of setting
Match ratio configures sharp sand slurry, and in return step b, until steel fibre self-compaction coagulation of the concrete divergence of prediction in setting
In native divergence threshold range；
Further, in step a, the value range of ξ is 0.9-1；
Further, the minimum plastic viscosity of mortar meets formula requirement:
In formula: ρ is the density of aggregate, and g is acceleration of gravity, and Δ ρ is the density contrast to gather materials with slurry, and X is coarse aggregate
Maximum mortar film thickness；
Further, in step b, self-compaction concrete mortar match ratio is obtained by following manner:
b1Concrete divergence SF1 prediction model is established, model is as follows:
SF 1=(l × Tm-m)×τSharp sand slurry+ n, wherein l, m, n respectively sift out mortar yield stress and sharp sand slurry surrender is answered
Power fit correlation sifts out mortar yield stress and the resulting relation value of concrete divergence fit correlation arrangement, TmFor mortar film
Thickness, τSharp sand slurryYield value of stress is starched for sharp sand；
b2Yield stress, the plastic viscosity of rotation ball test sharp sand slurry are starched and used by certain match ratio configuration sharp sand,
The sharp sand slurry yield stress of actual measurement, the mortar film thickness drafted (are wrapped in it using the calculating of coarse aggregate specific surface area is resulting
The mortar film thickness on surface) it is updated to the divergence that concrete is predicted in concrete divergence prediction model；
b3By the concrete divergence of prediction, the self-compacting concrete divergence threshold value of sharp sand slurry plastic viscosity and setting
Minimum plastic viscosity needed for range, sharp sand slurry is compared, if the concrete divergence of prediction is in the self-compaction coagulation of setting
In native divergence threshold range and sharp sand slurry plastic viscosity is met the requirements, then is entered in next step, if the concrete extension of prediction
Degree then readjusts match ratio configuration sharp sand slurry, and return step f outside the self-compacting concrete divergence threshold range of setting
In, until the concrete divergence of prediction is in the self-compacting concrete divergence threshold range of setting；
b4The cooperation of the sharp sand slurry using concrete divergence in the self-compacting concrete divergence threshold range of setting
Than, and according to total dosage V of mortar under gradation of coarse aggregate unit of account volume coarse aggregate dosagem1, wherein mortar film thickness Tm≥
2.1mm；
b5Unit volume coarse aggregate and mortar total amount are scaled mix parameters of high-strength self-compacting concrete；
Further, step b4In, utilize gradation of coarse aggregate, actual measurement apparent density ρsd, actual measurement bulk density ρpd, by formula 1
The accumulation gap V of unit of account volume coarse aggregatev1, by the surface area A of 2 unit of account volume coarse aggregate of formulac1:
Formula 1,
Formula 2,
In formula: KiFor the mass fraction of total aggregate shared by i-stage partial size aggregate；Simplify partial size, meter for i-stage coarse aggregate
Calculate formula are as follows:Wherein Di+1、Di-1Indicate adjacent screen size；
Further, step b4In, utilize the accumulation gap V of unit volume coarse aggregatev1, surface area Ac1It is calculated by formula 3
The volume V of mortar needed for wrapping up unit insulation product coarse aggregatee1, pass through required sand under 4 unit of account volume coarse aggregate dosage of formula
Starch total volume Vm1:
Formula 3, Ve1=Tm·Ac1；
Formula 4, Vm1=Ve1+Vv1；
Further, step b5In, utilize mortar total volume V required under unit volume coarse aggregate dosagem1, counted by formula 5
Calculate coarse aggregate volume V in unit volume self-compacting concreteg, pass through mortar in 6 unit of account volume self-compacting concrete of formula
Volume Vm:
Formula 5,
Formula 6,
Beneficial effects of the present invention: the Steel Fiber Reinforced Self-compacting Concrete match ratio of the invention based on mortar rheological behavior is set
Meter method, design precision is higher, closer to reality, can preferably complete in material selection process to the excellent of component
Change and Properties Control, master-plan step and clear thinking, it is easy to operate rationally, avoid the blindness in prior art operation
Property, reduce because the adjustment of trial repeatedly brings time, manpower, material and energy waste, thus have better operability and
Practicability.
Specific embodiment
A kind of Steel Fiber Reinforced Self-compacting Concrete mixing proportion design method based on mortar rheological behavior of the invention, including with
Lower step:
A. steel fiber reinforced concrete divergence SF prediction model is established, model is as follows:
Wherein, ξ≤1 indicates folding
Subtract coefficient, reflection is difference between Steel Fiber Reinforced Self-compacting Concrete calculated value and actual value, the major diameter with steel fibre
Than related, draw ratio is bigger, and reduction coefficient is smaller, and preferably value range is 0.9-1；A, b and c is constant, indicate rheology with
It is fitted the relation value of superposition between working performance: can be optimized according to a large amount of test accumulation, the variation of data does not influence this
The essence of invention:
τSFM=A × φ+τm
Wherein, the length and diameter of L, D-expression steel fibre；A-expression steel fibre impact factor；YSFSteel fiber reinforced concrete divergence；τSFSCCSift out the yield shear stress of steel fibre mortar；τSFMSteel fibre
Mortar yield stress；τmMortar yield stress；φ-expression steel fibre volume；.τmIndicate mortar yield stress；B. according to mixed
Solidifying soil strength grade requires to determine water-cement ratio, cementitious material ratio, and determines self-compaction concrete mortar match ratio:
Self-compaction concrete mortar match ratio is obtained by following manner:
b1Concrete divergence SF1 computation model is established, model is as follows:
SF 1=(l × Tm-m)×τSharp sand slurry+ n, wherein l, m, n respectively sift out mortar yield stress and sharp sand slurry surrender is answered
Power fit correlation sifts out mortar yield stress and the resulting relation value of concrete divergence fit correlation arrangement, TmFor mortar film
Thickness, τSharp sand slurryYield value of stress is starched for sharp sand；
b2Yield stress, the plastic viscosity of rotation ball test sharp sand slurry are starched and used by certain match ratio configuration sharp sand,
And the sharp sand of actual measurement slurry yield stress, the mortar film thickness drafted (are calculated into resulting be wrapped in using coarse aggregate specific surface area
The mortar film thickness on its surface) it is updated to the divergence that concrete is predicted in concrete divergence prediction model；According to concrete
Intensity requirement carries out pure Mortar Mixing Ratio Design and Experiment in conjunction with experience and makes corresponding sharp sand slurry, then passes through rotary rheology
Instrument tests the yield stress of sharp sand slurry, plastic viscosity, will test in resulting sharp sand slurry yield stress substitution model and predict coagulation
Native divergence, (when with coarse aggregate maximum settlement distance being a mortar film thickness, minimum plastic viscosity control needed for sharp sand slurry is from close
Real agent on crack resistance of concrete isolates performance, that is, the threshold value for preventing fresh concrete mix from isolating) utilize the minimum plasticity of mortar
Viscosity requirement, and consider to sift out the reduction relationship of mortar and sharp sand slurry, calculate minimum plastic viscosity needed for sharp sand slurry:
Formula 1,
In formula: ηminMinimum plastic viscosity needed for being starched for sharp sand；β is that sharp sand slurry declines relative to mortar plastic viscosity is sifted out
Coefficient, recommendation are taken as 0.79；DmaxFor maximum size of coarse aggregate；ρpdFor coarse aggregate apparent density；ρmSharp sand pulp density；
b3By the concrete divergence of prediction, the self-compacting concrete divergence threshold value of sharp sand slurry plastic viscosity and setting
Range, sharp sand are starched minimum plastic viscosity and are compared, if the concrete divergence of prediction expands in the self-compacting concrete of setting
In latitude of emulsion threshold range and sharp sand slurry plastic viscosity is met the requirements, then is entered in next step, if the concrete divergence of prediction exists
The self-compacting concrete divergence threshold range of setting is outer or sharp sand slurry plastic viscosity is less than threshold value, then readjusts match ratio
Configure sharp sand slurry, and return step b2In, until self-compacting concrete divergence threshold of the concrete divergence of prediction in setting
It is worth in range；If predicting, divergence meets defined self-compacting concrete divergence and requires (that is: self-compacting concrete divergence threshold
Value) and sharp sand slurry plastic viscosity be greater than threshold value, then carry out next step mortar total amount calculate；Conversely, then readjusting mortar
Match ratio carries out the test of mortar rheological parameter until meeting the requirements；
b4The cooperation of the sharp sand slurry using concrete divergence in the self-compacting concrete divergence threshold range of setting
Than the total dosage V for calculating mortarm1, wherein setting mortar film thickness Tm≥2.1mm；Specifically:
Pass through the accumulation gap V of 1 unit of account volume coarse aggregate of formula using gradation of coarse aggregatev1, list is calculated by formula 2
The surface area A of position volume coarse aggregatec1:
Formula 1,
Formula 2,
In formula: KiFor the mass fraction of total aggregate shared by i the partial size aggregate, %；Simplify grain for i-stage coarse aggregate
Diameter, calculation formula are as follows:Wherein Di+1、Di-1Indicate adjacent screen size.
Utilize the specific surface area A in the accumulation gap of unit volume coarse aggregatec1It is thick that package unit insulation product is calculated by formula 3
The volume V of mortar needed for aggregatee1, pass through required mortar total volume V under 4 unit of account volume coarse aggregate dosage of formulam1:
Formula 3, Ve1=Tm·Ac1,
Formula 4, Vm1=Ve1+Vv1。
b5Pass through various source material mixture ratios in the total dosage unit of account volume self-compacting concrete of mortar；Specifically: benefit
With mortar total volume V required under unit volume coarse aggregate dosagem1, by thick in 5 unit of account volume self-compacting concrete of formula
Volume of gathering materials Vg, mortar volume V in unit of account volume self-compacting concrete is calculated by formula 6m:
Formula 5,
Further according to pure mortar mix ratio, unit volume coarse aggregate and mortar total amount are scaled self-compacting concrete cooperation
Than.
B. using yield stress, the plastic viscosity of rotation ball test mortar, the mortar yield stress of actual measurement is updated to
Steel fiber reinforced concrete divergence SF1 surveys in model the divergence for predicting steel fiber reinforced concrete:
The smallest plastic viscosity formula of mortar are as follows:
In formula: ρ is the density of aggregate, g/cm3, g is acceleration of gravity, m/S2；Δ ρ is the density contrast to gather materials with slurry, g/
cm3；Maximum mortar film thickness of the X for coarse aggregate, cm, meanwhile, it also needs according to the plastic viscosity folding sifted out between mortar and mortar
Subtract relationship to be modified.
One, slurry THICKNESS CALCULATION is wrapped up in about steel fibre:
The specific surface area of steel fibre differs smaller compared with the specific surface area of coarse aggregate with the specific surface area of sand, therefore by steel fibre
It is considered as fine aggregate, by calculating the mistake net slurry thickness of the mortar sand used in self-compacting concrete, calculation formula is as follows:
1. the net slurry film thickness of sand:
According to the gradation of fine aggregate, the specific surface area A of sandc:
In formula: ρsFor fine aggregate apparent density；KiFor the mass fraction of total aggregate shared by i the partial size aggregate, %；For
The average grain diameter of i-stage partial size coarse aggregate, Di+1, Di-1For adjacent two screen size；
Net slurry film thickness T is calculated using formula using following specific surface area methodm:
In formula: VeFor net slurry volume used in unit mortar, mSandFor the quality of sand used in unit volume mortar.
2. steel fibre specific surface area calculates are as follows:
The quality m of single fiberiAre as follows: mi=π (R/2)2·l·ρ
The surface area S of single fiberiAre as follows: si=π Rl+2 × π × (R/2)2
The specific surface area of fiber:
In formula: R is the diameter of fiber, and l is the length of fiber, and ρ is the density of fiber.
3. steel fibre volume increases a% in steel fibre mortar, net slurry answers incrementss are as follows:
mNet slurry increment=mSF×ASF×Tm×ρNet slurry
In formula: mSFThe steel fibre quality for being a% for volume fraction, ρNet slurryFor net slurry density.
Two, about water-cement ratio and cementitious material ratio
Water-cement ratio and gel material content are calculated all in accordance with the application technology regulatory requirements of self-compacting concrete.
1) corresponding concrete strength is prepared according to requirement of engineering, determines the water-cement ratio formula of concrete are as follows:
In formula: mb- for the quality of cementitious material in unit concrete；mw- for the use of cementitious material in unit concrete
Amount；fce- it is cement 28d compression strength (MPa)；γ-is the cementitious coefficient of mineral admixture；β≤0.3 flyash () it is desirable
0.4, β≤0.4 miberal powder () desirable 0.9.
2) cementitious material quality in every cubic metre of self-compacting concrete are as follows:
In formula: introducing the volume of air in the concrete of Va-every cube, for the self-compacting concrete of non-research work of air entrained type, Va can
Take 10-20L.ρwThe density of mixing water, usually takes 1000kg/m in-every cube concrete3。
3) the apparent density ρ of cementitious materialbIt is true according to the relative amount and respective apparent density of mineral admixture and cement
It is fixed, its calculation formula is:
In formula: ρm- be mineral admixture apparent density, (kg/m3)；ρe- be cement apparent density, (kg/m3)；
The concrete Minerals admixture of β-every cube accounts for the mass fraction of cementitious material, (%).
Three, about the yield stress τ for determining mortarmWith plastic viscosity ηm
Under glue when cementitious material certain situation, the volume point of adjustable sand and the volume of water-reducing agent, the body of sand
Fraction is with referring to specification value, between 0.42-0.46, the volume of water-reducing agent should be according to the yield stress and modeling of matched mortar
Property viscosity determine that i.e. yield stress answers as small as possible, make the yield stress of base concrete and Steel Fiber Reinforced Self-compacting Concrete
Minimum, but must satisfy the stability of mortar, minimum plastic viscosity should meet:
In formula: ρ is the density of aggregate, and g/cm3, g are acceleration of gravity, m/S2；Δ ρ is the density contrast to gather materials with slurry,
g/cm3；X is the maximum mortar film thickness of coarse aggregate, cm.
Meanwhile the reduction relationship for considering to sift out mortar and sharp sand slurry plastic viscosity also being needed to be modified.
Four, about the mortar film thickness and constant c for determining coarse aggregate.
According to the mix parameters of high-strength self-compacting concrete based on mortar rheology, the value suggestion based on finite data sample is
2.5mm-2.9mm, c=760.The data relationship variation that mass data sample generates, does not influence the essence of this fermentation.
Five, the influence coefficient A of steel fibre is determined, steel fibre wraps up net slurry thickness, the draw ratio of steel fibre
After determining the yield stress of mortar, according to the following formula between steel fibre mortar yield stress and mortar yield stress
Relationship wraps up net slurry thickness according to sand and determines that steel fibre wraps up net slurry thickness.Steel fibre is determined by steel fibre mortar rheological test
The influence coefficient A of dimension.The draw ratio of steel fibre can be obtained by the morphometry of steel fibre.
Six, about constant a, b
The relation value being superimposed, a=- in the present invention are fitted between rheology and working performance in constant a, b in formula
0.011, b=0.066, a large amount of data sample can bring the optimization of data, not influence essence of the invention.
C. the steel fiber reinforced concrete divergence of prediction, mortar plastic viscosity and the Steel Fiber Reinforced Self-compacting Concrete of setting are expanded
Minimum plastic viscosity needed for latitude of emulsion threshold range, mortar is compared, if the steel fiber reinforced concrete divergence of prediction is being set
Steel Fiber Reinforced Self-compacting Concrete divergence threshold range in and mortar plastic viscosity meet the requirements, then enter in next step, if
The steel fiber reinforced concrete divergence of prediction is then readjusted outside the Steel Fiber Reinforced Self-compacting Concrete divergence threshold range of setting
Match ratio configures sharp sand slurry, and in return step b, until steel fibre self-compaction coagulation of the concrete divergence of prediction in setting
In native divergence threshold range；Steel Fiber Reinforced Self-compacting Concrete can be regarded as to be carried out by self-compacting concrete and steel fibre net slurry
Secondary mix-design forms.Determination for mix parameters of high-strength self-compacting concrete can be set using match ratio in the prior art
Meter method, it is preferred to use the MIX PROPORTION DESIGN OF SELF-COMPACTING CONCRETE method recorded in the present invention, for steel fibre net slurry, when only examining
When considering net slurry and steel fibre, conglomeration easily occurs for steel fibre, therefore should be considered using steel fibre mortar.In steel fibre mortar mix ratio
When design, the volume fraction of water-cement ratio used, sand should all be remained unchanged.Due to the addition of steel fibre, cementitious material should be adjusted
Dosage, and pass through the rheological parameter of rotational rheometer measurement steel fibre mortar.
Calculated examples:
By taking C50 Steel Fiber Reinforced Self-compacting Concrete mix-design as an example, determine that water-cement ratio is 0.28, cementitious material is common
Portland cement and flyash, flyash account for the 30% of gel material content.
The mix-design of mortar are as follows:
The minimum plastic viscosity of plastic viscosity lower limit mortar according to claim 3 require to be calculated (.
1 Mortar Mixing Ratio Design and Experiment of table and rheological parameter
Original concrete match ratio are as follows:
Predict divergence according to (the MIX PROPORTION DESIGN OF SELF-COMPACTING CONCRETE method based on mortar rheological behavior calculates)
2. original concrete mix-design of table
Divergence meets self-compacting concrete requirement.The morphological parameters of steel fibre:
3. steel fibre parameter of table
4 unit mass steel fibre of table should increase net slurry slurry amount
Mix Proportion of Melt-extracted Steel Fiber Reinforced Concrete:
Annotation: such as test number SF-0.5%, indicate that the volume of steel fibre is the 0.5% of original concrete volume
Divergence prediction, the results are shown in Table 5:
YSF=0.99 × (- 75.69 × φ+753)
5. steel fiber reinforced concrete theory divergence of table and actual measurement divergence
Error=(theoretical value-measured value)/theoretical value × 100
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this
In the scope of the claims of invention.
Claims (7)
1. a kind of Steel Fiber Reinforced Self-compacting Concrete mixing proportion design method based on mortar rheological behavior, it is characterised in that: including
Following steps:
A. steel fiber reinforced concrete divergence SF prediction model is established, model is as follows:
Wherein, ξ≤1 indicates reduction system
Number；A, b and c is constant, indicates to be fitted the relation value being superimposed between rheology and working performance；L and D respectively indicate steel fibre
Length and diameter；The impact factor of A expression steel fibre；τmIndicate mortar yield stress；The volume volume of φ expression steel fibre；
B. it is required to determine water-cement ratio, cementitious material ratio according to strength grade of concrete, and determines self-compaction concrete mortar cooperation
Than；
C. using yield stress, the plastic viscosity of rotation ball test mortar, the mortar yield stress of actual measurement is updated to steel fibre
It ties up concrete divergence SF and surveys in model the divergence for predicting steel fiber reinforced concrete；
D. by the steel fiber reinforced concrete divergence of prediction, mortar plastic viscosity and the Steel Fiber Reinforced Self-compacting Concrete divergence of setting
Minimum plastic viscosity needed for threshold range, mortar is compared, if the steel fiber reinforced concrete divergence of prediction is in the steel of setting
In fiber self-dense concrete divergence threshold range and mortar plastic viscosity is met the requirements, then is entered in next step, if prediction
Steel fiber reinforced concrete divergence outside the Steel Fiber Reinforced Self-compacting Concrete divergence threshold range of setting, then readjust cooperation
Than configuration sharp sand slurry, and in return step b, until the concrete divergence of prediction expands in the Steel Fiber Reinforced Self-compacting Concrete of setting
In latitude of emulsion threshold range.
2. the Steel Fiber Reinforced Self-compacting Concrete mixing proportion design method according to claim 1 based on mortar rheological behavior,
It is characterized by: the value range of ξ is 0.9-1 in step a.
3. the Steel Fiber Reinforced Self-compacting Concrete mixing proportion design method according to claim 1 based on mortar rheological behavior,
It is characterized by: the plastic viscosity minimum value of mortar meets formula requirement:
In formula: ρ is the density of aggregate, and g is acceleration of gravity, and Δ ρ is the density contrast to gather materials with slurry, and X is the maximum of coarse aggregate
Mortar film thickness.
4. the Steel Fiber Reinforced Self-compacting Concrete mixing proportion design method according to claim 1 based on mortar rheological behavior,
It is characterized by: self-compaction concrete mortar match ratio is obtained by following manner in step b:
b1Concrete divergence SF1 prediction model is established, model is as follows:
SF 1=(l × Tm-m)×τSharp sand slurry+ n, wherein l, m, n respectively sift out mortar yield stress and sharp sand slurry yield stress is quasi-
Conjunction relationship sifts out mortar yield stress and the resulting relation value of concrete divergence fit correlation arrangement, TmFor mortar film thickness,
τSharp sand slurryYield value of stress is starched for sharp sand；
b2Yield stress, the plastic viscosity that rotation ball test sharp sand slurry is starched and used by certain match ratio configuration sharp sand, will be real
The sharp sand slurry yield stress of survey, the mortar film thickness drafted are updated to the expansion that concrete is predicted in concrete divergence prediction model
The latitude of emulsion；
b3By the concrete divergence of prediction, sharp sand slurry plastic viscosity and setting self-compacting concrete divergence threshold range,
Minimum plastic viscosity needed for sharp sand slurry is compared, if the concrete divergence of prediction is extended in the self-compacting concrete of setting
In degree threshold range and sharp sand slurry plastic viscosity is met the requirements, then is entered in next step, if the concrete divergence of prediction is being set
Outside fixed self-compacting concrete divergence threshold range, then match ratio configuration sharp sand slurry, and return step b are readjusted2In, directly
To prediction concrete divergence in the self-compacting concrete divergence threshold range of setting；
b4The match ratio of the sharp sand slurry using concrete divergence in the self-compacting concrete divergence threshold range of setting, and
According to total dosage V of mortar under gradation of coarse aggregate unit of account volume coarse aggregate dosagem1, wherein mortar film thickness Tm≥2.1mm；
b5Unit volume coarse aggregate and mortar total amount are scaled mix parameters of high-strength self-compacting concrete.
5. the Steel Fiber Reinforced Self-compacting Concrete mixing proportion design method according to claim 4 based on mortar rheological behavior,
It is characterized by: step b4In, utilize gradation of coarse aggregate, actual measurement apparent density ρsd, actual measurement bulk density ρpd, calculated by formula 1
The accumulation gap V of unit volume coarse aggregatev1, by the surface area A of 2 unit of account volume coarse aggregate of formulac1:
Formula 1,
Formula 2,
In formula: KiFor the mass fraction of total aggregate shared by i-stage partial size aggregate；Simplify partial size for i-stage coarse aggregate, calculates public
Formula are as follows:Wherein Di+1、Di-1Indicate adjacent screen size.
6. the Steel Fiber Reinforced Self-compacting Concrete mixing proportion design method according to claim 5 based on mortar rheological behavior,
It is characterized by: step b4In, utilize the accumulation gap V of unit volume coarse aggregatev1, surface area Ac1It is calculated and is wrapped up by formula 3
The volume V of mortar needed for unit insulation product coarse aggregatee1, total by required mortar under 4 unit of account volume coarse aggregate dosage of formula
Volume Vm1:
Formula 3, Ve1=Tm·Ac1；
Formula 4, Vm1=Ve1+Vv1。
7. the Steel Fiber Reinforced Self-compacting Concrete mixing proportion design method according to claim 5 based on mortar rheological behavior,
It is characterized by: step b5In, utilize mortar total volume V required under unit volume coarse aggregate dosagem1, list is calculated by formula 5
Coarse aggregate volume V in the volume self-compacting concrete of positiong, pass through mortar volume in 6 unit of account volume self-compacting concrete of formula
Vm:
Formula 5,
Formula 6,
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| CN112035930A (en) * | 2020-09-01 | 2020-12-04 | 兰州理工大学 | Medium-fluidity concrete mix proportion design method based on mortar rheological characteristics |
| CN116359450A (en) * | 2023-05-31 | 2023-06-30 | 道生天合材料科技(上海)股份有限公司 | Comprehensive evaluation method for adhesive liquid precipitation behavior |
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