CN105036626B - A kind of method of multifactor parametric method design high performance concrete - Google Patents
A kind of method of multifactor parametric method design high performance concrete Download PDFInfo
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Abstract
The invention belongs to Concrete technical field, need to repeatedly be calculated to solve existing high performance concrete, trial, experiment, the problems such as heavy workload, accuracy is poor, error is big, a kind of multifactor parametric method is provided and designs high performance concrete.According to coarse aggregate kind, specification, sorting out the ratio of mud influences water consumption, dry that concrete consistency influences sand coarse aggregate ratio, plastic concrete correspond to the water consumption of the ratio of mud, sand coarse aggregate ratio selects table, again statistical fit goes out the corresponding ratio of mud, stone grade, the water consumption of concrete slump, sand coarse aggregate ratio exploitation formula, by the mix-design parameter that many factors arranged influence, it is summarised on a parameter list by correlation.The high-performance match ratio of " four elements " coordination is rapidly completed, greatly improves speed of production, the wastage of material for reducing the experiment of early period and thus bringing reduces error and reduces manpower and materials early investment waste.Reduce the pollution to environment, achieve the effect that green production.Reach same technique requirement, reduce cost.
Description
Technical field
The invention belongs to Concrete technical fields, and in particular to a kind of multifactor parametric method design high performance concrete.
Background technology
21 century concrete technology enters the high performance concrete epoch, and Chinese scholar Wu Shenwei is taught about high performance concrete low-intensity
Change, green idea has been commonly colleague both at home and abroad and has received.By three high high performance concrete reasons of high intensity, high workability and high patience
It reads, single to arrive C30 with regard to concrete strength grade is downward, greenization has covered whole rate ranges.Current paper《High performance concrete should
Use technical manual》By high performance concrete term synthesis for " requirement of the characteristics of with Building Engineering Design, construction and use to concrete performance is
General objective selects high-quality conventional raw materials, reasonable Mixed With Admixture and mineral admixture, using compared with low water binder ratio, and optimizes and matches
Composition and division in a proportion is made by mixing and stirring the greenization mode of production and stringent working measure in advance with excellent mix physical performance, mechanical property
The concrete of energy, endurance quality and long-term behaviour ".
Concrete mix design is referred to as the soul of concrete technology, is the key technology of each developing stage of concrete technology.Into height
The performance concrete epoch have the history of 15 years, now from the theory of high-strength and high performance concrete to Medium and low intensity, greening color extension, are formed
Such as《High performance concrete application technology guide》In new concept.And high performance concrete is divided into conventional H PC, speciality HPC.
Its target is the high-quality conventional raw materials of reasonable selection, dual mixing technology, green compared with low water binder ratio, optimized mix-proportion, premixing
Color production, well construction, make concrete have the concrete of excellent mix physical performance, mechanical property, endurance quality and long-term behaviour.
High performance concrete is divided into conventional high performance concrete, and strength grade is the Concrete mix design of ＜ C60 and speciality product high-performance
Mix-design.Speciality high performance concrete includes high-strength and high performance concrete, self-compaction high performance concrete, fiber high performance concrete, light bone
Expect concrete etc..
The basic demand of conventional high performance concrete is：1. be designed by intensity, endurance quality, should meet mixed strength of concrete and
Basic mechanical performance, mix physical performance, long-term behaviour and endurance quality design requirement；2. Concrete mix design requires to include meter
Calculation, trial mix, two stages of correction and trial, calculating has approximation, and trial is the key that design, should will calculate, trial works
More simple and direct, accurate and reduction tested number.It is adjusted by trial and determines mix physical performance, mechanical property and endurance quality, make height
Performance concrete meets engineering design and construction requirement.Simultaneously in terms of Technological Economy by mixtures optimal design to most preferably.
High performance concrete develops into six components from four components, and mixture becomes commodity, premixing production and marketing, employs pumping, under water
A variety of blanks and moulding and conserving techniques such as perfusion, centrifugal forming, steam press maintenance, matching design " three elements "（The ratio of mud, slurry bone ratio, sandstone
Than）Increase as " four elements "（The ratio of mud, size composition volume, slurry bone ratio, sand coarse aggregate ratio）Or even " five elements "（Additive and water
The compatibility of mud and sizing material and concrete）.Concrete design requirement is increased, influence factor greatly increases, as strength grade range is expanded into
C10~C120（Water-cement ratio 0.7~0.20）；Workability is increased to workability by workability, divergence, pumping, damage of collapsing, coagulated
Time, gain in strength or even education resistance, fillibility etc. are tied, except meeting mechanical property by the durability under different use conditions
Index becomes the requirement prior to intensity, prepares production, construction environmental protection greening.Multi items additives, admixture, cement, sand, stone
Using.High performance concrete becomes the system engineering that conglomerate is completed jointly, and industry barrier increases the influence factor to form product.It is numerous
More influence factors comb basic point of the application as this research.
Multi items additive, admixture, cement, stone sand（Aggregate）The application of product makes high performance concrete become a variety of industries
The aggregate of product.No matter outside the far apart fine chemical industry product of the core material cement or professional technique property of concrete
Agent is added all to become the component that can not lack, but every profession and trade performs respective standard, the method for inspection, due to the driving of economic interests,
It is brought in addition blindly pursuing the industries such as high slump mistake conduct obstruction in the imbalance of seasonal materials, particularly pouring construction
Negative effect, influence concrete design factor is made to increase by series, form the additive primarily researched and solved of high performance concrete and cement,
With sizing material and the matter of utmost importance of concrete compatibility.
High-strength and high performance Concrete mix design is to adopt the glue bone that the professors of the U.S. P.L.Mehta, P.C.Aictin two propose
Than, cement mortar rate, sand coarse aggregate ratio（Volume ratio）With divide intensity（Water-cement ratio）, insertion determine the design method of water consumption, and for new general
Conventional high performance concrete and other speciality high performance concrete mix-design methods are being probed into thought.To the scholar in China, Chen Jiankui
Professor proposes " the full calculating method of high performance concrete ", Yan Peiyu professors'《Modern concrete feature》（" concrete " 1 phase in 2009）To modern concrete spy
The application of point, modern Concrete mix design method, additive and cementitious material compatibility and other materials, proposes view.Lian Hui
Professor's treasure etc.《Current Concrete mix design there are the problem of》About one of concrete ratio selection scheme discussion, two, in succession
It is published in " concrete " 3 phases in 2009 and 5 phases.It is proposed principle, concrete ratio " four elements ", the step of mix proportion selection of determining match ratio
Rapid and citing.
Core technology in relation to high performance concrete is risen into standard criterion level, such as《Concrete In Structures durability Design specification》
GB/T50746-2008 dictates the durability index of different condition.《Ordinary concrete matching design technical regulation》JGJ55-
2011 revise and enlarge into mix additive, mineral admixture mixing proportion design method.《About several meanings for promoting and applying high performance concrete
See》With《High performance concrete application technology guide》It demonstrates to high performance concrete pilot, standard advanced improves standard.Build research/development platform,
The regulations such as key breakthrough high performance concrete control with raw material, mix-design, quality control, durability index system, green production
Go out principles and policies.
Invention content
The present invention needs repeatedly calculating, trial, experiment to solve existing high performance concrete, and heavy workload, accuracy is poor, misses
The problems such as difference is big provides a kind of multifactor parametric method design high performance concrete.
The present invention is realized by following technical solution：A kind of multifactor parametric method design high performance concrete, method are：According to thick
Aggregate kind, specification, sorting out the ratio of mud influences water consumption, and dry that concrete consistency influences sand coarse aggregate ratio, plastic concrete correspond to water
Water consumption, the sand coarse aggregate ratio of gray scale select table, and statistical fit again goes out the corresponding ratio of mud, stone grade, the water consumption of concrete slump, sand
Rate exploitation formula by the mix-design parameter that many factors arranged influence, is summarised in broken by mutual relationship
On stone Pumping Concrete Mixture Ratio parameter list.
Mutual Conversion Calculation formula and concrete strength calculating formula are formula 1 between the parameter of comprehensive statistics, complete conventional high performance concrete institute
The design of match ratio is needed to calculate；It is formula 2 that the pumping admixture spike established, which is counted, with the increased exponential function calculating formula of water-cement ratio, is reflected
Pumping admixture reduces concentration increase, saturation degree increase, water-reducing rate in slurry with water-cement ratio to be reduced, the increased rule of volume；
fcu.o=fcu.k+ 1.645 σ and fcu.o=αa ƒce(B/W-αb)·γA·γS（Formula 1）
SCP（%）=[1.6+0.1e（W/B）]/190×SL（Formula 2）；
In formula 1：fcu.oFor mixed strength of concrete, when concrete strength grade is less than C60, fcu.o≥ fcu.k+1.645σ；fcu.k
Design strength grade point for concrete cubic compressive strength standard value, i.e. concrete；σ is concrete strength standard deviation；B/W is used for cement ratio
The ratio between water and cement+admixture；γACoefficient is influenced for flyash；γsCoefficient is influenced for ground granulated blast furnace slag；α a, α b are
Broken Stone Concrete regression coefficient；
In formula 2：Scp is pumping admixture spike with the increased exponential function of water-cement ratio；B/W is cement ratio, that is, water consumption and cement
The ratio between+admixture；SL is slump value.
The rubble Pumping Concrete Mixture Ratio parameter list is table 1：With striaght cement, that is, sizing material all for the ratio of mud W/C of Cement Concrete or
Additive mineral admixture flyash FA, miberal powder FS are mixed, concrete water-cement ratio W/B is that the rubble of criterion pumps conventional high performance concrete, concrete
Strength grade range C15~C55, C30~C55 belong to high performance concrete, and ＜ C30 are 11 component concretes of extension；
In table：First behavior corresponds to concrete strength grade design control intensity, striaght cement concrete ratio of mud W/C and corresponding multiple
Rubber alloy gel material concrete water-cement ratio W/B；Additive mineral admixture flyash is mixed in second behavior, contents of ground slag combined influence is
Number；II FA, S75FS complex mineral blending material doping quantity of fly ash percentage α A, contents of ground slag percentage α S of third behavior and correspondence
Flyash maximum doping quantity α Amax percentages, miberal powder maximum doping quantity α Smax percentages；Fourth line is II FA, S95FS grandidierite
Polymer blends material doping quantity of fly ash percentage α A, contents of ground slag percentage α S and corresponding flyash maximum doping quantity percentage α
Amax, miberal powder maximum doping quantity percentage α Smax；First is classified as knapper's journey continuous grading grade；Second is classified as concrete slump SL
Design value；Third row are corresponding to ballast grain sizes, the concrete water consumption m of concrete slump controlling value and sand coarse aggregate ratio β S；4th row to 14 row
The first row and the third line are corresponded to fifth line to 16 behaviors；Consider the sand coarse aggregate ratio of SL influences and the water consumption that water-cement ratio influences；
Wherein：Sand is not more than 2% middle sand for 5mm screen over-sizes, and sand coarse aggregate ratio optimum range is ± 2%；Required slump diminishing
Agent adjusts；SL is slump value；W/B is water-cement ratio, that is, cement+the ratio between admixture and water consumption；β s are sand coarse aggregate ratio, and powder containing quantity is big
Machine-made Sand amount reduces 1%, the small aggregate chips sand increase 1%-2% of powder containing quantity；Mwo is per cubic meter of concrete water consumption, water consumption range
For ± 10kg/m3。
The present invention collects in the correlation of match ratio coefficient that many factors influence between in one table, and unique one
Lattice.Mutual Conversion Calculation formula and preparation strength calculating formula f between the coefficient of comprehensive statisticscu.o=fcu.k+ 1.645 σ and fcu.o=αa
ƒce(B/W-αb) ·γA·γS It matches, completes ordinary concrete and leaped to conventional high performance concrete mix-design.According to special
Product high performance concrete《Technology requirement》Adjust flyash, contents of ground slag influences coefficient：When mixing silicon ash, replaced by 3 times of values of the activity of cement
For cement consumption and account for sizing material percentage and volume（L/m3), bone ratio of sizing mixing, sand coarse aggregate ratio complete the cooperation of speciality high performance concrete
Than design.The rubble Pumping Concrete Mixture Ratio parameter list prepares the cooperation of high performance concrete raw material according to the present invention, reduces test
Error and manpower material are rapidly completed " four elements " i.e. water-cement ratio, glue bone ratio, sand coarse aggregate ratio and additive mineral kind volume and coordinate
High-performance match ratio, substantially increase the speed of the manufacturing, the raw material wave for reducing the experiment of early period and thus bringing
Take, reduce error and reduce manpower and materials early investment waste.Reach identical technology requirement, reduce using material
Cost.Reduce the pollution to environment, achieve the effect that green production.
Description of the drawings
Fig. 1 is KA、KsVolume rectangular plots.
Specific embodiment
A kind of multifactor parametric method design high performance concrete, method are：According to coarse aggregate kind, specification, the ratio of mud is sorted out
Water consumption is influenced, dry that concrete consistency influences sand coarse aggregate ratio, plastic concrete correspond to the water consumption of the ratio of mud, sand coarse aggregate ratio selection table, weigh
New statistical fit goes out the corresponding ratio of mud, stone grade, the water consumption of concrete slump, sand coarse aggregate ratio exploitation formula, the crowd that will be arranged
The mix-design parameter of multifactor impact is summarised in by mutual relationship on rubble Pumping Concrete Mixture Ratio parameter list.
Mutual Conversion Calculation formula and concrete strength calculating formula are formula 1 between the parameter of comprehensive statistics, complete conventional high performance concrete institute
The design of match ratio is needed to calculate；It is formula 2 that the pumping admixture spike established, which is counted, with the increased exponential function calculating formula of water-cement ratio, is reflected
Pumping admixture reduces concentration increase, saturation degree increase, water-reducing rate in slurry with water-cement ratio to be reduced, the increased rule of volume；
fcu.o=fcu.k+ 1.645 σ and fcu.o=αa ƒce(B/W-αb)·γA·γS（Formula 1）
SCP（%）=[1.6+0.1e（W/B）]/190×SL（Formula 2）；
In formula 1：fcu.oFor mixed strength of concrete, when concrete strength grade is less than C60, fcu.o≥ fcu.k+1.645σ；fcu.k
Design strength grade point for concrete cubic compressive strength standard value, i.e. concrete；σ is concrete strength standard deviation；B/W is used for cement ratio
The ratio between water and cement+admixture；γACoefficient is influenced for flyash；γsCoefficient is influenced for ground granulated blast furnace slag；α a, α b are
Broken Stone Concrete regression coefficient；
In formula 2：Scp is pumping admixture spike with the increased exponential function of water-cement ratio；B/W is cement ratio, that is, water consumption and cement
The ratio between+admixture；SL is slump value.
The rubble Pumping Concrete Mixture Ratio parameter list is table 1：With striaght cement, that is, sizing material all for the ratio of mud W/C of Cement Concrete or
Additive mineral admixture flyash FA, miberal powder FS are mixed, concrete water-cement ratio W/B is that the rubble of criterion pumps conventional high performance concrete, concrete
Strength grade range C15~C55, C30~C55 belong to high performance concrete, and ＜ C30 are 11 component concretes of extension；
In table：First behavior corresponds to concrete strength grade design control intensity, striaght cement concrete ratio of mud W/C and corresponding multiple
Rubber alloy gel material concrete water-cement ratio W/B；Additive mineral admixture flyash is mixed in second behavior, contents of ground slag combined influence is
Number；II FA, S75FS complex mineral blending material doping quantity of fly ash percentage α A, contents of ground slag percentage α S of third behavior and correspondence
Flyash maximum doping quantity α Amax percentages, miberal powder maximum doping quantity α Smax percentages；Fourth line is II FA, S95FS grandidierite
Polymer blends material doping quantity of fly ash percentage α A, contents of ground slag percentage α S and corresponding flyash maximum doping quantity percentage α
Amax, miberal powder maximum doping quantity percentage α Smax；First is classified as knapper's journey continuous grading grade；Second is classified as concrete slump SL
Design value；Third row are corresponding to ballast grain sizes, the concrete water consumption m of concrete slump controlling value and sand coarse aggregate ratio β S；4th row to 14 row
The first row and the third line are corresponded to fifth line to 16 behaviors；Consider the sand coarse aggregate ratio of SL influences and the water consumption that water-cement ratio influences；
Wherein：Sand is not more than 2% middle sand for 5mm screen over-sizes, and sand coarse aggregate ratio optimum range is ± 2%；Required slump diminishing
Agent adjusts；SL is slump value；W/B is water-cement ratio, that is, cement+the ratio between admixture and water consumption；β s are sand coarse aggregate ratio, and powder containing quantity is big
Machine-made Sand amount reduces 1%, the small aggregate chips sand increase 1%-2% of powder containing quantity；Mwo is per cubic meter of concrete water consumption, water consumption range
For ± 10kg/m3。
The mix proportion selection step of high performance concrete is prepared according to rubble Pumping Concrete Mixture Ratio parameter list：
（1）Confirm in concrete structure《Concrete technology requirement》Target, condition and the indices and parameter of proposition.
Concrete structural elements type, protective layer minimum thickness, local environment, design life, durability index（According to institute
Locate environmental selection）, minimum strength grade, maximum water-cement ratio, cementitious material minimum and maximum dosage, construction seasons, inside concrete most
High-temperature（If it is required that）, maximum aggregate size, the mixture slump, 1h slumps maximum loss, setting time, concrete strength increase
Long speed etc..
Conventional high performance concrete is shown in Table the regulation of water-cement ratio and mineral admixture volume percentage 2, in table：It is logical using other
During with portland cement, the blending amount of mixture material of more than 20% cement mixture volume is preferably included in mineral admixture；Composite blend
The volume politician of each component is more than maximum doping quantity when singly mixing；When being used in mixed way two or more mineral admixture,
The total volume of mineral admixture should meet the regulation of composite blend in table.
Table 2：The maximum doping quantity table of armored concrete Minerals admixture
Prestressed reinforced concrete Minerals admixture maximum doping quantity is shown in Table 3, in table：Using other common portland cements
When, the mixing material gauge of more than 20% cement mixture volume is preferably entered into mineral admixture；The volume political affairs of composite blend each component
It manages a household more than maximum doping quantity when singly mixing；When being used in mixed way two or more mineral admixture, mineral admixture is always mixed
Amount should meet the regulation of composite blend in table.
Table 3：Prestressed reinforced concrete Minerals admixture maximum doping quantity
Concrete material and water-cement ratio, protective layer thickness are shown in Table 4 in general environment, in table：Service life is less than in I-A environment
The plate of 100 years, wall, when aggregate nominal maximum aggregate size is not more than 15mm, protective layer minimum thickness can be reduced to 15mm, but
Maximum water-cement ratio should not exceed 0.55；Average temperature of the whole year is more than 20 DEG C and environment of the mean annual humidity more than 75%, except I-A environment
In plate, outside wall member, concrete minimum strength grade should improve level-one than regulation in table or increase protective layer minimum thickness
5mm；When the component directly poured by the tactile soil body, thickness of concrete cover are no less than 70mm. and have concrete cushion, by table
It determines.In circulating water or simultaneously in by water silt underwashing component, protective layer thickness preferably increases by 10~20mm；Prefabricated structure
The protective layer thickness of part reduces 5mm than regulation in table；When flyash in cementitious material and slag are when volumes are less than 20%, table
Middle water-cement ratio is less than 0.45, can suitably increase.
Table 4：Concrete material and water-cement ratio, protective layer thickness in general environment
The water-cement ratio rule that the 1 rubble Pumping Concrete Mixture Ratio parameter list of table follows is water-cement ratio as defined in JGJ55-2011
Rule：
fcu.o=0.53ce·KA·S(B/W-0.20)（Broken Stone Concrete）；W/B=0.53·ƒb/(fcu.o +0.106ƒb)；
ƒb=ƒce·KA·S=ƒce·γA ·γS ；In formula：fcu.oFor mixed strength of concrete（MPa）, when concrete strength grade is less than C60,
fcu.o≥ fcu.k+1.645σ；When concrete strength grade is more than C60, fcu.o≥ 1.15fcu.k；Fcu.k is concrete cube pressure resistance
Spend the design strength grade point of standard value, i.e. concrete（MPa）；B is cementitious material 28d glue sand compression strength（MPa）；0.53,0.2
For Broken Stone Concrete regression coefficient α a, α b；KAS influences coefficient gamma to mix additive mineral admixture doping quantity of fly ashA It is mixed with miberal powder
Amount influences comprehensive effect coefficient KAS=γ that multiplication obtainsA ·γS；σ is concrete strength standard deviation（MPa）, when not near
When phase same kind, same strength grade concrete strength data, standard deviation presses 5 value of table.
Table 5：Standard deviation sigma value（MPa）
| Concrete strength grade | ≤C20 | C25~C45 | C50~C55 |
| σ | 4.0 | 5.0 | 6.0 |
Flyash influences coefficient（γA）Coefficient is influenced with ground granulated blast furnace slag（γs）6 are shown in Table, in table：Using I grade, II
The grade suitable capping value of flyash；Limit value is preferably removed using S75 grades of ground granulated blast furnace slags, using S95 grades of ground granulated blast furnace slags
Suitable capping value, can use upper limit value using S105 grades of ground granulated blast furnace slags and adds 0.05；When the volume in table, flyash
It is tests determined that ground granulated blast furnace slag influences coefficient.
Table 6：
γA、γsFig. 1 is shown in the diagram of coefficient：KA、KsVolume rectangular plots.
The mathematical model of multifactor parametric method comprehensive statistics is shown in Table 7, usually presses W/C by the concrete strength grade of design requirement
=0.53 fce/（fcu.o+1.06 fce）Calculate ratio of mud W/C during striaght cement；Based on KAS=1.17-0.622W/C
Calculate mix additive, flyash miberal powder, Composite rubber material KA·S；Water-cement ratio W/B calculating formulas are W/B=0.53 ceKAS/
(fcu.o+0.106 fce·KA·S）；The percentage of mineral admixture volume is calculated as：αA/αAmax+αS/αSmax =
1；αAⅡ,max= 1.056-1.007KA.S；αS75,max = 1.464-1.332KA.S；αS95,max= 1.457-
1.098KA.S；αA=(1-αS/αSmax)×αAmax；αS=(1-αA/αAmax)×αSmax)；C=1-αA-αS；In formula：αAmax、
α Smax are the maximum doping quantity ratio for mixing flyash, miberal powder in additive admixture flyash, miberal powder high performance concrete；α A, α S are
When selected contents of ground slag or doping quantity of fly ash ratio, counted flyash, contents of ground slag ratio are counted.
With water mwoWith the calculating of gum base ingredients volume：mWO=[186·SL0.117·DX-0.113·（W/B）0.1+7（Mf-
2）]·（1-β）；B=mWO /（W/B）；C=B × C%；FA=B × α A；FS=B × α S；In formula：S designs the slump for concrete
（mm）；DX is concrete the maximum particle of crushed stone（mm）；W/B --- by formula（2.2-3）The water-cement ratio of calculating；Mf is the thickness of concrete sand
Degree, coarse sand take 1, middle sand that 2, fine sand is taken to take 3；β --- additive（Pumping admixture）Average water-reducing rate（%）；mWO、B、C、FA、
FS--- it is respectively concrete water consumption, binder total amount, cement, flyash, miberal powder dosage（kg/m3）.
Concrete sand coarse aggregate ratio SP（%）By formula（2.5-1）It calculates, after concrete ratio mp is selected, sand, stone dosage are respectively based on B, C
Formula is calculated to calculate：mWO=[186·SL0.117·DX-0.113·（W/B）0.1+7（Mf-2）]·（1-β）；B=mWO/（W/B）；C=
B×C%；FA=B × α A；FS=B × α S；In formula：S designs the slump for concrete（mm）；DX is concrete the maximum particle of crushed stone（mm）；
MfFor the fineness degree of concrete sand, coarse sand takes 1, middle sand that 2, fine sand is taken to take 3；β is additive（Pumping admixture）Average water-reducing rate（%）；
MWO, B, C, FA, FS are respectively concrete water consumption, binder total amount, cement, flyash, miberal powder dosage（kg/m3）.
Table 7：
（2）According to《Concrete technology requirement》Select raw material.
（3）Confirm raw material condition：
Cement：Kind, density, consumptive use of water normal consistence, when having contained mineral admixture kind and content, the heat of hydration, condensation
Between, intensity, the time of making the product, temperature.Stone：Kind, apparent density, loose bulk density, water absorption rate, maximum particle diameter, grading
Voidage after ratio and grading.Sand：Mesh analysis, apparent density, fineness modulus, water absorption rate, loose bulk density, containing mud
Amount, artificial sand value containing MB, content of stone powder, powder content, the source of equivalent containing mud.Mineral admixture：Kind, density, water demand ratio,
Loss on ignition, fineness.Additive：Kind, concentration（To aqua）, other indexs of correlation（The bleed of the water-reducing rate, air entraining agent of water-reducing agent
Amount）.The alkali contents of more than raw material, chloride ion content, into factory's unit price.
（4）Each parameter of concrete ratio determines：
Each material sign：Quality：Cement C, miberal powder FS, flyash FA, sand S, stone G, water W, cementitious material B, water-cement ratio W/
B；The component of cementitious material is in the number of cementitious material：Miberal powder αS, flyash αA；Density：Cement ρC, miberal powder ρS, flyash ρA, sand
ρS, stone ρg, water ρW, sizing material ρB；Volume：Cement VC, miberal powder VS , flyash VA, water VW, cementitious material VB, sand VS, stone Vg, rubber cement body
Ve, dry sand slurry Ves, the concrete amount of being made（Mixture）Volume VP, aggregate volume Vs,g；Starch bone ratio：Ve/Vs.g, sand coarse aggregate ratio（Sand coarse aggregate ratio）
βS。
It presses《Concrete technology requirement》Minimum strength grade is selected, and is more than or equal to 95% by fraction and calculates preparation strength.According to
Environment category and function grade, component feature（Such as scantling）, construction seasons and cement type determine that mineral admixture is mixed
Amount, with《Concrete technology requirement》Maximum water-cement ratio be limited, adjust water-cement ratio（I.e. water-cement ratio increases according to mineral volume and is reduced）.
Graded aggregate obtains minimum aggregate pine heap plot ratio.
（5）Each coefficient of concrete ratio and material utilization amount calculate（By mass method）.
（6）Mucilage volume V is calculated by volumetric methode, dry sand volume of slurry Ves With volume V is madeP , match ratio is corrected by it.
（7）Trial mix corrects and trial match ratio determines
In selected high efficiency water reducing agent（Pumping admixture）And during raw material, it is necessary to do and modulate additive and cement fortunately（Glue
Material）And with common concrete ratio compatibility it is good on the basis of could stock up, carry out lower step work.This step is very crucial at present, pushes away
Additive, water-reducing rate and the amount of mixing recommended, to press standard cement, standard concrete ratio is examined, lateral as same veriety, quality
The index of comparison, some kind self-defects are just very big to the sensibility of use condition, in addition the problem of industry barrier tape is come, makes
There is numerous and disorderly phenomenon in concrete technology.Synthesis is：" cement is thin, and reserve strength is small；Intensity is high, and crack is more；Component is more, control
System is difficult；It constructs fast, short life；Resource lacks, and to say green." present concrete ratio work is made to be in gear shaper without theoretical
It is single concrete core starting materials cement to be become in modern concrete to very complicated or even by cement standard, the method for inspection in the puzzlement of foundation
There is nonadjustable situation in the compatibility for the cement and admixture for examining judgement qualified.Saturation point of the additive in slurry with
The increase of concentration in slurry and increase, reduced with water-reducing rate under volume, using all with the estimated value of its water-reducing rate that is averaged estimate
Additive usage can increase with the reduction error of concrete water-cement ratio.
Trial, determines " quasi- coordination in works " at adjustment：《Concrete technology requirement》On the basis of maximum water-cement ratio, selection is covered
4-5 each material utilization amount of glue ratio calculation of the maximum water-cement ratio of lid, carries out trial, the index value of performance, is repaiied specified by detection
Related coefficient, increases the adaptability to material therefor in positive water-cement ratio-intensitometer formula；Establish each Mined scale strength and maturation
The relationship of degree；Concrete base price is adjusted, therefrom chooses the water-cement ratio for meeting desired value, trial determines " quasi- coordination in works " again（Examination
Test match ratio）.
Claims (2)
- A kind of 1. method of multifactor parametric method design high performance concrete, it is characterised in that：Method is：According to coarse aggregate kind, rule Lattice, sorting out the ratio of mud influences water consumption, and what dry that concrete consistency influences sand coarse aggregate ratio, plastic concrete corresponded to the ratio of mud uses water Amount, sand coarse aggregate ratio select table, and statistical fit again goes out the corresponding ratio of mud, stone grade, the water consumption of concrete slump, sand coarse aggregate ratio exploitation Formula by the mix-design parameter that many factors arranged influence, is summarised in rubble pumping concrete by mutual relationship and matches On composition and division in a proportion parameter list；Mutual Conversion Calculation formula and concrete strength calculating formula are formula 1 between the parameter of comprehensive statistics, complete conventional high-performance The design of match ratio needed for concrete calculates；It is formula 2 that the pumping admixture spike established, which is counted, with the increased exponential function calculating formula of water-cement ratio, Reflect that pumping admixture reduces concentration increase, saturation degree increase, water-reducing rate in slurry with water-cement ratio and reduces, the increased rule of volume；fcu.o=fcu.k+ 1.645 σ and fcu.o=αa ƒce(B/W-αb)·γA·γS（Formula 1）Scp（%）=[1.6+0.1e（W/B）]/190×SL（Formula 2）；In formula 1：fcu.oFor mixed strength of concrete, when concrete strength grade is less than C60, fcu.o≥ fcu.k+1.645σ；fcu.kIt is stood for concrete The design strength grade point of cube compressive strength standard value, i.e. concrete；σ is concrete strength standard deviation；B/W for cement ratio, that is, water consumption with The ratio between cement+admixture；γACoefficient is influenced for flyash；γsCoefficient is influenced for ground granulated blast furnace slag；αa、αbFor Broken Stone Concrete Regression coefficient；In formula 2：Scp is pumping admixture spike with the increased exponential function of water-cement ratio；B/W is mixed for cement ratio, that is, water consumption and cement+ Close the ratio between material；SL is slump value.
- 2. a kind of method of multifactor parametric method design high performance concrete according to claim 1, it is characterised in that：It is described broken Stone Pumping Concrete Mixture Ratio parameter list is table 1：It all for the ratio of mud W/C of Cement Concrete or mixes additive mineral with striaght cement, that is, sizing material and mixes Close feed powder coal ash FA, the conventional high performance concrete of rubble pumping that miberal powder FS, concrete water-cement ratio W/B are criterion, concrete strength grade range C15 ~C55, C30~C55 belong to high performance concrete, and ＜ C30 are 11 component concretes of extension；In table：First behavior corresponds to concrete strength grade design control intensity, striaght cement concrete ratio of mud W/C and corresponding compound adhesive Gel material concrete water-cement ratio W/B；The coefficient of additive mineral admixture flyash, contents of ground slag combined influence is mixed in second behavior；The Three behaviors II FA, S75FSComplex mineral blending material doping quantity of fly ash percentage αA, contents of ground slag percentage αSAnd corresponding fine coal Grey maximum doping quantity α Amax percentages, miberal powder maximum doping quantity α Smax percentages；Fourth line is blended for II FA, S95FS complex mineral Expect doping quantity of fly ash percentage αA, contents of ground slag percentage αSAnd corresponding flyash maximum doping quantity percentage α Amax, miberal powder are most Large dosage percentage α Smax；First is classified as knapper's journey continuous grading grade；Second is classified as concrete slump SL design values；Third Row are corresponding to ballast grain sizes, the concrete water consumption m of concrete slump controlling value and sand coarse aggregate ratio βS；4th arranges to 14 row and fifth line to ten Six behaviors correspond to the first row with the third line and consider the sand coarse aggregate ratio of SL influences and the water consumption that water-cement ratio influences；Wherein：Sand is not more than 2% middle sand for 5mm screen over-sizes, and sand coarse aggregate ratio optimum range is ± 2%；Required slump water-reducing agent tune It is whole；SL is slump value；W/B is water-cement ratio, that is, cement+the ratio between admixture and water consumption；β s be sand coarse aggregate ratio, the big mechanism of powder containing quantity Sand amount reduces 1%, the small aggregate chips sand increase 1%-2% of powder containing quantity；Mwo be per cubic meter of concrete water consumption, water consumption ranging from ± 10kg/m3。
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