CN106830828A - C40~C50 high performance concretes and cooperation stirring means - Google Patents
C40~C50 high performance concretes and cooperation stirring means Download PDFInfo
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- CN106830828A CN106830828A CN201710049978.0A CN201710049978A CN106830828A CN 106830828 A CN106830828 A CN 106830828A CN 201710049978 A CN201710049978 A CN 201710049978A CN 106830828 A CN106830828 A CN 106830828A
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0032—Controlling the process of mixing, e.g. adding ingredients in a quantity depending on a measured or desired value
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Abstract
A kind of C40~C50 high performance concretes and cooperation, stirring means.Traditional mix Design follows Bolomey's formula, i.e. concrete strength and ratio of mud relational expression, and in the match ratio, the ratio of mud is obtained by theoretical calculation.Present invention composition includes：Coarse aggregate, fine aggregate, cement, additive, mineral admixture and mixing water, described mix-design and stirring means is divided into four steps to be carried out：（1）The match ratio preparatory stage；（2）Each composition material quality requirement of match ratio；（3）Determine the folk prescription material usage stage according to match ratio；（4）The match ratio trial mix stage.The present application relates to civil engineering compounding art, more particularly to it is applied to C40~C50 high performance concretes and coordinates, stirs.
Description
Technical field：
The present application relates to a kind of civil engineering compounding art, more particularly to a kind of C40~C50 high performance concretes and cooperation, stir
Mix method.
Background technology：
Traditional mix Design follows Bolomey's formula, i.e. concrete strength and ratio of mud relational expression,
In the match ratio, the ratio of mud is obtained by theoretical calculation, and this is also the core of early concrete match ratio, and the match ratio sets
Meter trial process is extremely cumbersome, and success rate is very low, in the urgent need to one kind has high fluidity, high volume stability, suitable in construction
Suitable intensity and the concrete of high-durability.The concrete is by cement, mineral admixture（With flyash, ground granulated blast furnace ore deposit
Ground-slag and silicon ash etc. are representative）At least six kinds component compositions such as water, coarse aggregate and fine aggregate, additive, this is a kind of new mixed
Solidifying soil, is very different with traditional concrete.
The content of the invention：
It is an object of the invention to provide a kind of C40~C50 high performance concretes and cooperation stirring means.
Above-mentioned purpose is realized by following technical scheme：
A kind of C40~C50 high performance concretes, its composition includes：Coarse aggregate, fine aggregate, cement, additive, mineral admixture
And mixing water, described mix-design and stirring means is divided into four steps to be carried out：（1）The match ratio preparatory stage；（2）Match somebody with somebody
Each composition material quality requirement of composition and division in a proportion；（3）Determine the folk prescription material usage stage according to match ratio；（4）The match ratio trial mix stage.
Described C40~C50 high performance concretes, the described match ratio preparatory stage includes：Determine the concrete of trial
Intensity, concentrated compactness concrete, managerial skills the higher person, probability of ensuring strength of concrete takes 95%, and concrete strength standard deviation can use
4；Managerial skills chump, probability of ensuring strength of concrete takes 95%, and concrete strength standard deviation preferably takes 4 or 5；Fragmentary stirring is mixed
Solidifying soil, managerial skills the higher person, probability of ensuring strength of concrete takes 95%, concrete strength standard deviation desirable 5；Managerial skills are poor
Person, probability of ensuring strength of concrete takes 95%, and concrete strength standard deviation preferably takes 5 or 6；Concrete optimum intensity can be counted as the following formula
Calculate；
Wherein fcu.0≤fcu.k+1.645 σ
Fcu.0 in formula --- -- concrete preparation strength；
Fcu.k in formula --- -- characteristic value of cubic concrete compressive strength；
σ ----concrete strength standard deviation；
Described C40~C50 high performance concretes, each composition material quality requirement of described match ratio is：A. coarse aggregate：C40
Concrete coarse aggregate nominal maximum particle diameter is not preferably greater than 31.5mm, and C50 concrete coarse aggregate nominal maximum particle diameters should not be big
In 26.5mm, the two is preferably preferentially broken or impact crushing rubble from continuous grading hammer, rubble masterbatch preferably preferred basalt, An Shan
The rocks such as rock, limestone, its uniaxial compressive strength is preferably greater than 100MPa, and rubble crush values are preferably less than 10%, and elongated particles are preferably small
In 10%, clay content is preferably less than 0.5%, and rubble apparent density is preferably greater than 2.70g/cm3, and other objectionable impurities contents are less than corresponding mark
Quasi- setting；B. fine aggregate：Preferential to select II area's river sand, the modulus of fineness of sand is preferably 2.4~3.0, and clay content is preferably less than
1.5%, apparent density is preferably greater than 2.70 g/cm3, and loose bulk density is preferably greater than 1500kg/m3, if workability meets construction and wants
Ask, it is also possible to from clean Machine-made Sand；C. cement：Portland cement preferentially is selected, it is high to early strength requirement or big
The concrete of volume mineral admixture, can select portland cement.Strength of cement grade preferentially selects 42.5 grades, raw material quality
When poor, 52.5 class g cements are can select；D. additive：It is preferential to select high-performance water reducing agent or high efficiency water reducing agent, representative kind
It is by the preferential order selected：Polycarboxylate system, aminocarboxylate system, naphthalene system, sulfamate system, melamine system（Melamine
Sulfonate and formaldehyde condensation product）；E. mineral admixture：Preferentially select II grade of flyash（Important engineering also can select I grade of fine coal
Ash）, it is preferential from mineral admixtures such as S95 grades of ground granulated blast furnace slag powders；F. mixing water：It is preferential to be mixed from drinking water
Concrete processed, it is also possible to use the water for meeting other water sources of JGJ63-2006.
Described C40~C50 high performance concretes, described determines that the folk prescription material usage stage is according to match ratio：（1）
C40~C50 high performance concretes need to use two or more Binder Materials, it is contemplated that image is accurate, and this match ratio anticipates tradition
The ratio of mud in justice renames as water-cement ratio；（2）According to engineering experience, the water-cement ratio of C40~C50 high performance concretes is preferably controlled
Between 0.31~0.38.Specifically value standard is：（a）C40 concrete values are preferably between 0.35~0.38, and C50 concrete takes
Value is preferably between 0.31~0.34；（b）Composition concrete raw material quality better, water-cement ratio can take large values；Conversely, concrete former material
Material inferior quality, water-cement ratio preferably gets the small value.In a word, though composition concrete raw material quality, water-binder ratio take compared with
Small value, it is easier to obtain desired trial strength, it is easier to meet life requirement；（3）Determine in material property and quality
On the premise of, according to historical data and experience, the size of expected water-cement ratio is tentatively drafted, but do not exceeded during trial mix and draft in advance
Water-cement ratio；（4）Determine the various material usages of a cubic meter of concrete by assuming that apparent density method is calculated：（a）Assume C40~
C50 high performance concretes apparent density is 2450 ± 50 kg/m3, and fresh concrete actual measurement apparent density is with its error ± 2%
Within when, can not be modified, otherwise, reply apparent density be modified;（b）Cement folk prescription consumption：It is actual strong according to cement
Degree combines detection and construction experience is drafted, and C40 concrete mixs can use 220kg~270kg；C50 concrete mixs can use
260kg~330kg;（c）Flyash folk prescription consumption, according to match ratio use environment, position, flyash quality, user to coagulation
The limitations affect factors such as the different requirements of each age strength of soil, the volume that flyash may be selected accounts for the 15%~35% of Binder Materials;
（d）Ground granulated blast furnace slag powders folk prescription consumption, according to match ratio use environment, position, ground granulated blast furnace slag silty
Amount, user may be selected mixing for ground granulated blast furnace slag powders to limitations affect factors such as the different requirements of each age strength of concrete
Amount accounts for the 15%~35% of Binder Materials；（e）Mineral admixture total amount is preferably between the 30%~40% of binder total amount；（f）.
（c）~（d）Mineral admixture can need to mix one or several according to construction, but be also not limited to both, through pass the test
Also the mineral admixture of other kinds may be selected；（g）Sand coarse aggregate ratio determines.Level according to sand is matched somebody with somebody, and modulus of fineness, coarse aggregate are maximum
Particle diameter, water-cement ratio, requirement of engineering, concrete transportation, the different choice sand coarse aggregate ratio of mode of movement, typically can use 35%~40%；（h）.
According to the cement consumption and water-cement ratio drafted, folk prescription water consumption is calculated；（i）After each material usage determines more than, can calculate
Slightly, fine aggregate consumption；（j）High efficiency water reducing agent is preferentially selected, representative kind is by the preferential order selected：Polycarboxylate system,
Aminocarboxylate system, naphthalene system, sulfamate system, melamine system（Condensate of melamine sulfonate and formaldehyde）；（5）Mineral are blended
Material：Preferentially select I grade of flyash（Common engineering, inessential engineering also can select II grade of flyash）, it is preferential from S95 grades of granulation
The mineral admixtures such as blast furnace ground slag powder；（6）Each strength grade concrete selects three kinds of different cement consumption trial mix coagulations
Soil, differs 20kg between every kind of different cement consumptions, control workability is constant, with last actual used water amount inverse water-cement ratio, behaviour
When making by water-cement ratio control within expection, after fresh concrete workability and Slump Time losing of Large are satisfied by requiring, dress
Three kinds of different mixture ratios of mold forming make a strength test, and test each age strength, and meeting trial strength with 28 days compression strength wants
Ask, and cement and other Binder Materials sum cost the lowests are used as benchmark match ratio；（7）By folk prescription former material determined above
Material consumption, expected water-cement ratio, different match ratios 25~35 liters of concrete of equal trial mix are used to check concrete mix workability
And intensity.
Cooperation, the stirring means of described C40~C50 high performance concretes：In the described match ratio trial mix stage, its concrete is matched somebody with somebody
Composition and division in a proportion stirring technique is：（1）During load weighted coarse aggregate, fine aggregate sequentially added into mixer, 15s is stirred, then
65% water is added, 20~30 s are stirred, cement and admixture is added, 40~60s is stirred, 25% water and high-performance diminishing is added
Agent, stirs 60~90s, and concrete workability is observed while stirring, if concrete flowability is small, adds remaining 10% water；If mixed
Solidifying soil mobility is still small, then continuously add 0.2%~0.5% high-performance water reducing agent, continues to stir 60~90s, if concrete and
Easy sexual satisfaction requirement, then discharging carries out further work, finally appraises and decides actual used water amount, appraises and decides water-cement ratio, and the water-cement ratio must not
More than the expected water-cement ratio drafted in advance；（2）If concrete workability is unsatisfactory for requiring, need to consider high-performance water reducing agent first
With the consistency problem of cement, secondly consider and other Binder Materials and high-performance water reducing agent consistency problem or the quality gathered materials
Problem（Surface characteristics and clean level etc.）；Conversely, the water consumption being computed shows a small surplus and the workability of concrete is completely full
Foot construction needs, and this is optimal result；（3）Stirring detects the workability of fresh concrete after finishing, meet and put after requiring
Enter static a period of time detection concrete slump gradual loss in lidded container, this index finally appraises and decides water after meeting requirement
Glue ratio；（4）After meeting requirement by the Slump Time losing of Large of the time interval determination of stirring, transport and Construction control, determine mixed
The apparent density of soil is coagulated, the density can not adjust each material usage of match ratio with when assuming apparent density error less than 2%, conversely,
The error need to correct adjustment each material usage of match ratio when being more than or equal to 2%, finally appraise and decide the apparent density of the match ratio；（5）Dress
Mold forming concrete sample, is covered with plastic foil, is placed on 20 ± 2 DEG C, and relative humidity is conserved to de- in the environment more than 95%
Mould, 20 ± 2 DEG C are placed on by the test specimen of the demoulding, and maintenance is surveyed to the age for needing in moisture health-preserving chamber of the relative humidity more than 95%
Try each age strength；（6）Other two kinds of match ratios of cement consumption are also tested by the above process, and each age strength is all tested
After finishing, three assemble 28 days age strengths of composition and division in a proportion is contrasted, and chooses Workable, and intensity is high, integrated cost reckling conduct
Benchmark match ratio.
Described C40~C50 high performance concretes coordinate, stirring means, and the equipment for being used is that Double-horizontal-shaft concrete is forced to stir
Machine is mixed, and is ensured during described match ratio trial mix, it is ensured that actual water-cement ratio is not more than expected water-cement ratio.
Beneficial effects of the present invention：
1. C40~C50 high performance concretes of the invention, intensity is high, and composition material is wide in variety, and intensity effect factor is more, all
In many intensity effect factors, the ratio of mud holds pride of place, therefore, when mix-design is carried out to this kind of concrete, if using
Theoretical calculation determines that the ratio of mud is then difficult to make and comes.
C40~C50 high performance concretes of the invention, are that conventional concrete mixing proportion design method is overturned, its core
The determination system experience that the heart is embodied in the ratio of mud drafts value, and rather than calculated value, in other words, the ratio of mud of high performance concrete is not
Theoretical calculation out, concrete mix nor only by calculating and designing the simple problem that just can be solved, but in reality
On the basis of trampling experience accumulation and constantly summarizing, an expected ratio of mud is drafted in advance, the value is must not exceed during trial, be combined with
Specific aim, it is directive it is a series of it is rigorous experiment and obtain practicality conclusion.
C40~C50 high performance concretes of the invention, the mix Design process carried out as core is simple
Understand, success rate is very high, and cost performance is of great satisfaction.
C40~C50 high performance concretes of the invention, prove through a large amount of engineering practices, and the present invention is novel, with very strong
Operability and practicality.
Specific embodiment：
Embodiment 1：
A kind of C40~C50 high performance concretes, its composition includes：Coarse aggregate, fine aggregate, cement, additive, mineral admixture
And mixing water, described mix-design and stirring means is divided into four steps to be carried out：（1）The match ratio preparatory stage；（2）Match somebody with somebody
Each composition material quality requirement of composition and division in a proportion；（3）Determine the folk prescription material usage stage according to match ratio；（4）The match ratio trial mix stage.
Embodiment 2：
C40~C50 high performance concretes according to embodiment 1, the described match ratio preparatory stage includes：Determine trial
Concrete strength, concentrated compactness concrete, managerial skills the higher person, probability of ensuring strength of concrete takes 95%, concrete strength standard
Difference desirable 4；Managerial skills chump, probability of ensuring strength of concrete takes 95%, and concrete strength standard deviation preferably takes 4 or 5；Sporadicly
Ready-mixed concrete, managerial skills the higher person, probability of ensuring strength of concrete takes 95%, concrete strength standard deviation desirable 5；Management water
Flat chump, probability of ensuring strength of concrete takes 95%, and concrete strength standard deviation preferably takes 5 or 6；Concrete optimum intensity can be pressed
Following formula is calculated：
Wherein fcu.0≤fcu.k+1.645 σ
Fcu.0 in formula --- -- concrete preparation strength；
Fcu.k in formula --- -- characteristic value of cubic concrete compressive strength；
σ ----concrete strength standard deviation；
Embodiment 3：
C40~C50 high performance concretes according to embodiment 1, each composition material quality requirement of described match ratio is：A.
Coarse aggregate：C40 concrete coarse aggregate nominal maximum particle diameter is not preferably greater than 31.5mm, and C50 concrete is maximum with coarse aggregate nominal
Particle diameter is not preferably greater than 26.5mm, and the two preferably preferentially hammers broken or impact crushing rubble into shape from continuous grading, and rubble masterbatch is preferably preferred profound
The rocks such as Wu Yan, andesite, limestone, its uniaxial compressive strength is preferably greater than 100MPa, and rubble crush values are preferably less than 10%, faller gill
Shape content is preferably less than 10%, and clay content is preferably less than 0.5%, and rubble apparent density is preferably greater than 2.70g/cm3, other objectionable impurities contents
Less than respective standard setting；B. fine aggregate：Preferential to select II area's river sand, the modulus of fineness of sand is preferably 2.4~3.0, clay content
Preferably less than 1.5%, apparent density is preferably greater than 2.70 g/cm3, and loose bulk density is preferably greater than 1500kg/m3, if workability meets
Construction requirement, it is also possible to from clean Machine-made Sand；C. cement：Portland cement preferentially is selected, it is high to early strength requirement
Or the concrete of high content mineral admixtures, can select portland cement.Strength of cement grade preferentially selects 42.5 grades, former material
When expecting second-rate, 52.5 class g cements are can select；D. additive：It is preferential to select high-performance water reducing agent or high efficiency water reducing agent, represent
Property kind be by the preferential order selected：Polycarboxylate system, aminocarboxylate system, naphthalene system, sulfamate system, melamine system（Three
Poly cyanamid sulfonate and formaldehyde condensation product）；E. mineral admixture：Preferentially select II grade of flyash（Important engineering also can select I grade
Flyash）, it is preferential from mineral admixtures such as S95 grades of ground granulated blast furnace slag powders；F. mixing water：Preferential selection is drunk
Water mixing concrete, it is also possible to use the water for meeting other water sources of JGJ63-2006.
Embodiment 4：
C40~C50 high performance concretes according to embodiment 1, described determines the folk prescription material usage stage according to match ratio
For：（1）C40~C50 high performance concretes need to use two or more Binder Materials, it is contemplated that image is accurate, and this match ratio will
The traditional ratio of mud renames as water-cement ratio；（2）According to engineering experience, the water-cement ratio of C40~C50 high performance concretes is suitable
Control is between 0.31~0.38.Specifically value standard is：（a）C40 concrete values are preferably between 0.35~0.38, and C50 is mixed
Solidifying soil value is preferably between 0.31~0.34；（b）Composition concrete raw material quality better, water-cement ratio can take large values；Conversely, coagulation
Native material quality is poor, and water-cement ratio preferably gets the small value.In a word, no matter composition concrete raw material quality, concrete glue
Than taking smaller value, it is easier to obtain desired trial strength, it is easier to meet life requirement；（3）In material property and matter
On the premise of amount determines, according to historical data and experience, the size of expected water-cement ratio is tentatively drafted, but thing is not exceeded during trial mix
The water-cement ratio first drafted；（4）Determine the various material usages of a cubic meter of concrete by assuming that apparent density method is calculated：（a）Assume
C40~C50 high performance concretes apparent density is 2450 ± 50 kg/m3, and fresh concrete actual measurement apparent density exists with its error
When within ± 2%, can not be modified, otherwise, reply apparent density is modified;（b）Cement folk prescription consumption：According to cement reality
Border intensity combines detection and construction experience is drafted, and C40 concrete mixs can use 220kg~270kg；C50 concrete mixs
Desirable 260kg~330kg;（c）Flyash folk prescription consumption, according to match ratio use environment, position, flyash quality, user couple
Each age strength of concrete is different the limitations affect factor such as to require, may be selected flyash volume account for Binder Materials 15%~
35%;（d）Ground granulated blast furnace slag powders folk prescription consumption, according to match ratio use environment, position, ground granulated blast furnace slag powders
Quality, user may be selected ground granulated blast furnace slag powders to limitations affect factors such as the different requirements of each age strength of concrete
Volume accounts for the 15%~35% of Binder Materials；（e）Mineral admixture total amount is preferably between the 30%~40% of binder total amount；
（f）.（c）~（d）Mineral admixture can need to mix one or several according to construction, but be also not limited to both, through experiment
The qualified mineral admixture that other kinds also may be selected；（g）Sand coarse aggregate ratio determines.Level according to sand is matched somebody with somebody, modulus of fineness, coarse aggregate
Maximum particle diameter, water-cement ratio, requirement of engineering, concrete transportation, the different choice sand coarse aggregate ratio of mode of movement, typically can use 35%~40%；
（h）According to the cement consumption and water-cement ratio drafted, folk prescription water consumption is calculated；（i）After each material usage determines more than, can count
Calculate thick, fine aggregate consumption；（j）High efficiency water reducing agent is preferentially selected, representative kind is by the preferential order selected：Polycarboxylate
System, aminocarboxylate system, naphthalene system, sulfamate system, melamine system（Condensate of melamine sulfonate and formaldehyde）；（5）Mineral are mixed
Close material：Preferentially select I grade of flyash（Common engineering, inessential engineering also can select II grade of flyash）, preferentially select S95 grades of grain
Change the mineral admixtures such as blast furnace ground slag powder；（6）Each strength grade concrete selects three kinds of different cement consumption trial mixs to mix
Solidifying soil, differs 20kg between every kind of different cement consumptions, control workability is constant, with last actual used water amount inverse water-cement ratio,
During operation by water-cement ratio control within expection, after fresh concrete workability and Slump Time losing of Large are satisfied by requiring,
Three kinds of different mixture ratios of packing compact forming are made a strength test, and test each age strength, and trial strength is met with 28 days compression strength
It is required that, and cement and other Binder Materials sum cost the lowests are used as benchmark match ratio；（7）It is former by folk prescription determined above
Material usage, expected water-cement ratio, different match ratios 25~35 liters of concrete of equal trial mix are used to check concrete mix to work
Property and intensity.
Embodiment 5：
Cooperation, the stirring means of the C40~C50 high performance concretes according to embodiment 1, described match ratio trial mix rank
Section, its concrete ratio stirring technique is：（1）During load weighted coarse aggregate, fine aggregate sequentially added into mixer, stirring
15s, is subsequently adding 65% water, stirs 20~30 s, adds cement and admixture, stirs 40~60s, adds 25% water and height
Performance water reducer, stirs 60~90s, and concrete workability is observed while stirring, if concrete flowability is small, adds remaining
10% water；If concrete flowability is still small, 0.2%~0.5% high-performance water reducing agent is continuously added, continues to stir 60~90s,
If concrete workability meets requiring, discharging carries out further work, finally appraises and decides actual used water amount, appraises and decides water-cement ratio, should
Water-cement ratio cannot be greater than the expected water-cement ratio drafted in advance；（2）If concrete workability is unsatisfactory for requiring, need to consider high first
The consistency problem of performance water reducer and cement, secondly consider with other Binder Materials and high-performance water reducing agent consistency problem or
The quality problems gathered materials（Surface characteristics and clean level etc.）；Conversely, the water consumption being computed shows a small surplus and the work of concrete
Construction needs are fully met as property, this is optimal result；（3）Stirring detects the workability of fresh concrete after finishing, full
Foot is put into static a period of time detection concrete slump gradual loss in lidded container after requiring, after this index meets requirement
Finally appraise and decide water-cement ratio；（4）Meet requirement by the Slump Time losing of Large of the time interval determination of stirring, transport and Construction control
Afterwards, the apparent density of concrete is determined, the density can not adjust each material of match ratio with when assuming apparent density error less than 2%
Consumption, conversely, the error need to correct adjustment each material usage of match ratio when being more than or equal to 2%, finally appraises and decides the apparent of the match ratio
Density；（5）Packing compact forming concrete sample, is covered with plastic foil, is placed on 20 ± 2 DEG C, in environment of the relative humidity more than 95%
The test specimen of the demoulding is placed on 20 ± 2 DEG C by maintenance to the demoulding, and maintenance extremely needs in moisture health-preserving chamber of the relative humidity more than 95%
Age, test each age strength；（6）Other two kinds of match ratios of cement consumption are also tested by the above process, each age
After intensity is all completed, three assemble 28 days age strengths of composition and division in a proportion is contrasted, and chooses Workable, and intensity is high, integrated cost
Reckling is used as benchmark match ratio.
Embodiment 6：
C40~C50 high performance concretes according to embodiment 1 or 2 or 3 or 4 or 5 coordinate, stirring means, and what is used sets
Standby is Double-horizontal-shaft concrete forced stirrer, and is ensured during described match ratio trial mix, it is ensured that actual water-cement ratio is not more than pre-
The water-cement ratio of phase.
Claims (5)
1. a kind of C40~C50 high performance concretes, its composition includes：Coarse aggregate, fine aggregate, cement, additive, mineral are blended
Material and mixing water, it is characterized in that：Described mix-design and stirring means is divided into four steps to be carried out：（1）Match ratio is accurate
The standby stage；（2）Each composition material quality requirement of match ratio；（3）Determine the folk prescription material usage stage according to match ratio；（4）Match ratio
Trial mix stage, the described match ratio preparatory stage includes：Determine the concrete strength of trial, concentrated compactness concrete manages water
Flat the higher person, probability of ensuring strength of concrete takes 95%, concrete strength standard deviation desirable 4；Managerial skills chump, strong concrete
Degree fraction takes 95%, and concrete strength standard deviation preferably takes 4 or 5；Fragmentary ready-mixed concrete, managerial skills the higher person, concrete
The strength factor of assurance takes 95%, concrete strength standard deviation desirable 5；Managerial skills chump, probability of ensuring strength of concrete takes 95%, mixes
Solidifying soil tension variance preferably takes 5 or 6；Concrete optimum intensity can be calculated as follows；
Wherein：Fcu.0≤fcu.k+1.645 σ
In formula：Fcu.0 --- -- concrete preparation strength；
In formula：Fcu.k --- -- characteristic value of cubic concrete compressive strength；
σ ----concrete strength standard deviation.
2. C40~C50 high performance concretes according to claim 1, it is characterized in that：Each composition material of described match ratio
Quality requirement is：A. coarse aggregate：C40 concrete coarse aggregate nominal maximum particle diameter is not preferably greater than 31.5mm, and C50 concrete is used
Coarse aggregate nominal maximum particle diameter is not preferably greater than 26.5mm, and the two preferably preferentially hammers broken or impact crushing rubble into shape from continuous grading, broken
The rocks such as stone master batch preferably preferred basalt, andesite, limestone, its uniaxial compressive strength is preferably greater than 100MPa, rubble crush values
Preferably less than 10%, elongated particles are preferably less than 10%, and clay content is preferably less than 0.5%, and rubble apparent density is preferably greater than 2.70g/cm3, its
He is less than respective standard setting at objectionable impurities content；B. fine aggregate：Preferential to select II area's river sand, the modulus of fineness of sand is preferably
2.4~3.0, clay content is preferably less than 1.5%, and apparent density is preferably greater than 2.70 g/cm3, and loose bulk density is preferably greater than 1500kg/m3,
If workability meets construction requirement, it is also possible to from clean Machine-made Sand；C. cement：Portland cement preferentially is selected, it is right
The concrete of early strength requirement height or high content mineral admixtures, can select portland cement.Strength of cement grade is preferential
From 42.5 grades, when raw material quality is poor, 52.5 class g cements are can select；D. additive：It is preferential from high-performance water reducing agent or
High efficiency water reducing agent, representative kind is by the preferential order selected：Polycarboxylate system, aminocarboxylate system, naphthalene system, sulfamic acid
Salt system, melamine system（Condensate of melamine sulfonate and formaldehyde）；E. mineral admixture：Preferentially select II grade of flyash（Important work
Journey also can select I grade of flyash）, it is preferential from mineral admixtures such as S95 grades of ground granulated blast furnace slag powders；F. mixing water：
It is preferential to select drinking water mixing concrete, it is also possible to use the water for meeting other water sources of JGJ63-2006.
3. C40~C50 high performance concretes according to claim 1 and 2, it is characterized in that：Described determines according to match ratio
The folk prescription material usage stage is：（1）C40~C50 high performance concretes need to use two or more Binder Materials, it is contemplated that image
Accurately, the ratio of mud is changed to water-cement ratio；（2）According to engineering experience, the water-cement ratio of C40~C50 high performance concretes is preferably controlled
Between 0.31~0.38.Specifically value standard is：（a）C40 concrete values are preferably between 0.35~0.38, and C50 concrete takes
Value is preferably between 0.31~0.34；（b）Composition concrete raw material quality better, water-cement ratio can take large values；Conversely, concrete former material
Material inferior quality, water-cement ratio preferably gets the small value.In a word, though composition concrete raw material quality, water-binder ratio take compared with
Small value, it is easier to obtain desired trial strength, it is easier to meet life requirement；（3）Determine in material property and quality
On the premise of, according to historical data and experience, the size of expected water-cement ratio is tentatively drafted, but do not exceeded during trial mix and draft in advance
Water-cement ratio；（4）Determine the various material usages of a cubic meter of concrete by assuming that apparent density method is calculated：（a）Assume C40~
C50 high performance concretes apparent density is 2450 ± 50 kg/m3, and fresh concrete actual measurement apparent density is with its error ± 2%
Within when, can not be modified, otherwise, reply apparent density be modified;（b）Cement folk prescription consumption：It is actual strong according to cement
Degree combines detection and construction experience is drafted, and C40 concrete mixs can use 220kg~270kg；C50 concrete mixs can use
260kg~330kg;（c）Flyash folk prescription consumption, according to match ratio use environment, position, flyash quality, user to coagulation
The limitations affect factors such as the different requirements of each age strength of soil, the volume that flyash may be selected accounts for the 15%~35% of Binder Materials;
（d）Ground granulated blast furnace slag powders folk prescription consumption, according to match ratio use environment, position, ground granulated blast furnace slag silty
Amount, user may be selected mixing for ground granulated blast furnace slag powders to limitations affect factors such as the different requirements of each age strength of concrete
Amount accounts for the 15%~35% of Binder Materials；（e）Mineral admixture total amount is preferably between the 30%~40% of binder total amount；（f）.
（c）~（d）Mineral admixture can need to mix one or several according to construction, but be also not limited to both, through pass the test
Also the mineral admixture of other kinds may be selected；（g）Sand coarse aggregate ratio determines.Level according to sand is matched somebody with somebody, and modulus of fineness, coarse aggregate are maximum
Particle diameter, water-cement ratio, requirement of engineering, concrete transportation, the different choice sand coarse aggregate ratio of mode of movement, typically can use 35%~40%；（h）.
According to the cement consumption and water-cement ratio drafted, folk prescription water consumption is calculated；（i）After each material usage determines more than, can calculate
Slightly, fine aggregate consumption；（j）High efficiency water reducing agent is preferentially selected, representative kind is by the preferential order selected：Polycarboxylate system,
Aminocarboxylate system, naphthalene system, sulfamate system, melamine system（Condensate of melamine sulfonate and formaldehyde）；（5）Mineral are blended
Material：Preferentially select I grade of flyash（Common engineering, inessential engineering also can select II grade of flyash）, it is preferential from S95 grades of granulation
The mineral admixtures such as blast furnace ground slag powder；（6）Each strength grade concrete selects three kinds of different cement consumption trial mix coagulations
Soil, differs 20kg between every kind of different cement consumptions, control workability is constant, with last actual used water amount inverse water-cement ratio, behaviour
When making by water-cement ratio control within expection, after fresh concrete workability and Slump Time losing of Large are satisfied by requiring, dress
Three kinds of different mixture ratios of mold forming make a strength test, and test each age strength, and meeting trial strength with 28 days compression strength wants
Ask, and cement and other Binder Materials sum cost the lowests are used as benchmark match ratio；（7）By folk prescription former material determined above
Material consumption, expected water-cement ratio, different match ratios 25~35 liters of concrete of equal trial mix are used to check concrete mix workability
And intensity.
4. a kind of one of claim 1-3 described C40~C50 high performance concretes coordinate and stirring means：It is characterized in that：Institute
In the match ratio trial mix stage stated, its concrete ratio stirring technique is：（1）By load weighted coarse aggregate, fine aggregate sequentially
Add in mixer, stir 15s, be subsequently adding 65% water, stir 20~30 s, add cement and admixture, stirring 40~
60s, adds 25% water and high-performance water reducing agent, stirs 60~90s, concrete workability is observed while stirring, if concrete stream
Dynamic property is small, then add remaining 10% water；If concrete flowability is still small, 0.2%~0.5% high-performance water reducing agent is continuously added,
Continue to stir 60~90s, if concrete workability meets requiring, discharging carries out further work, finally appraises and decides actual used water
Amount, appraises and decides water-cement ratio, and the water-cement ratio cannot be greater than the expected water-cement ratio drafted in advance；（2）Will if concrete workability is unsatisfactory for
Ask, then need to consider the consistency problem of high-performance water reducing agent and cement first, secondly consider and other Binder Materials and high-performance
Water reducer compatibility problem or the quality problems gathered materials（Surface characteristics and clean level etc.）；Conversely, the water consumption being computed is omited
Have remaining and the workability of concrete fully meets construction needs, this is optimal result；（3）Stirring is detected after finishing and newly mixed
The workability of concrete, meets and be put into after requiring static a period of time detection concrete slump gradual loss in lidded container,
This index finally appraises and decides water-cement ratio after meeting requirement；（4）By the slump of the time interval determination of stirring, transport and Construction control
After degree gradual loss satisfaction is required, the apparent density of concrete is determined, the density can with when assuming apparent density error less than 2%
Each material usage of match ratio is not adjusted, conversely, the error need to correct adjustment each material usage of match ratio when being more than or equal to 2%, finally
Appraise and decide the apparent density of the match ratio；（5）Packing compact forming concrete sample, is covered with plastic foil, is placed on 20 ± 2 DEG C, relatively
Humidity is conserved to the demoulding in the environment more than 95%, and the test specimen of the demoulding is placed on into 20 ± 2 DEG C, moisture of the relative humidity more than 95%
Maintenance tests each age strength to the age for needing in health-preserving chamber；（6）Other two kinds of match ratios of cement consumption are also pressed with top
Method is tested, and after each age strength is all completed, three assemble 28 days age strengths of composition and division in a proportion is contrasted, and chooses workability
Good, intensity is high, integrated cost reckling is used as benchmark match ratio.
5. C40~C50 high performance concretes according to claim 4 coordinate and stirring means, it is characterized in that：Used
Equipment is Double-horizontal-shaft concrete forced stirrer, and is ensured during described match ratio trial mix, it is ensured that actual water-cement ratio is not more than
Expected water-cement ratio.
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| CN108256245A (en) * | 2018-01-24 | 2018-07-06 | 叶寿春 | A kind of high performance concrete preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107651921A (en) * | 2017-10-26 | 2018-02-02 | 上海建工材料工程有限公司 | Underwater C35 ~ C40 the concrete formulating methods of high pressure resistant high-thin arch dam poured under ultra-deep water environment |
| CN108256245A (en) * | 2018-01-24 | 2018-07-06 | 叶寿春 | A kind of high performance concrete preparation method |
| CN108256245B (en) * | 2018-01-24 | 2021-10-29 | 叶寿春 | Preparation method of high-performance concrete |
| CN108818924A (en) * | 2018-06-07 | 2018-11-16 | 中铁二局第工程有限公司 | A kind of preparation method mixing sand concrete |
| CN111056791A (en) * | 2019-12-16 | 2020-04-24 | 保利长大工程有限公司 | Steel shell immersed tube self-compacting concrete mix proportion design method and concrete |
| CN112341063A (en) * | 2020-11-26 | 2021-02-09 | 中土木（北京）技术检测有限公司 | Medium-low grade machine-made sand concrete mix proportion debugging method |
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