CN105844007B - Based on intensity and chloride ion permeability Two indices concrete mixing proportion design method - Google Patents
Based on intensity and chloride ion permeability Two indices concrete mixing proportion design method Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 152
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 title claims abstract description 110
- 238000013461 design Methods 0.000 title claims abstract description 71
- 230000010220 ion permeability Effects 0.000 title claims abstract description 70
- 238000002156 mixing Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 45
- 239000004568 cement Substances 0.000 claims abstract description 83
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 56
- 230000000694 effects Effects 0.000 claims abstract description 33
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 33
- 239000011707 mineral Substances 0.000 claims abstract description 33
- 239000000203 mixture Substances 0.000 claims abstract description 18
- 230000035515 penetration Effects 0.000 claims abstract description 10
- 239000010881 fly ash Substances 0.000 claims description 37
- 239000000463 material Substances 0.000 claims description 25
- 238000009792 diffusion process Methods 0.000 claims description 19
- 238000004364 calculation method Methods 0.000 claims description 15
- 239000004576 sand Substances 0.000 claims description 12
- 230000006835 compression Effects 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- 239000002956 ash Substances 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 8
- 239000003292 glue Substances 0.000 claims description 7
- 230000000996 additive effect Effects 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 5
- 239000000654 additive Substances 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000010703 silicon Substances 0.000 claims description 5
- 230000035699 permeability Effects 0.000 description 9
- 239000003638 chemical reducing agent Substances 0.000 description 7
- 239000002994 raw material Substances 0.000 description 7
- 230000000875 corresponding effect Effects 0.000 description 5
- 239000002689 soil Substances 0.000 description 5
- 230000015271 coagulation Effects 0.000 description 4
- 238000005345 coagulation Methods 0.000 description 4
- 239000004575 stone Substances 0.000 description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 3
- 239000000460 chlorine Substances 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 2
- 239000010883 coal ash Substances 0.000 description 2
- 239000004035 construction material Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical group Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000012615 aggregate Substances 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention provides one kind to be based on intensity and chloride ion permeability Two indices concrete mixing proportion design method, comprising: when (1) calculating single water mixing mud, meets the water consumption W and the first cement consumption C of Concrete Object intensityf；(2) the second cement consumption C for meeting target chloride ion permeability is calculatedD；(3) intensity activity K is calculatedf, resistance of chloride ion penetration activity KD；(4) mineral admixture dosage FA and cement consumption C is calculated；(5) concrete mix is calculated.It is provided in the present invention to be based on intensity and chloride ion permeability Two indices concrete mixing proportion design method, the mix-design stage is participated in using chloride ion permeability index as target capabilities, designs while meeting the concrete mix of intensity and chloride ion permeability Two indices.
Description
Technical field
It is the present invention relates to the manufacture technology field of construction material, in particular to a kind of double based on intensity and chloride ion permeability
Index concrete mixing proportion design method.
Background technique
With the continuous development of concrete technology, people, which recognize this construction material of concrete, constantly to deepen, in conjunction with
The design concept of sustainable development and the protection to ecological environment are considered, using mineral admixtures such as flyash as concrete
Raw material have been widely used in Practical Project.And the endurance issues of concrete are gradually caused weight in recent years
Depending on.Wherein, the problem of leading to steel bar corrosion due to the erosion of chloride ion under littoral environment, is especially prominent, and chloride ion permeability influences
The durability of concrete.But since flyash and cement influence difference to the performance of concrete, how to reasonably adjust mineral blending
The ratio of material is not only able to satisfy the intensity of concrete works actual requirement to reach, but also is able to satisfy concrete under littoral environment
The ability for resisting Chloride Attack is the key that mix Design.
According to JGJ55-2011, " normal concrete cooperates the concrete mixing proportion design method used in engineering at present mostly
Than design discipline " requirement execute.But this method is mainly using intensity as the concrete mixing proportion design method of Con trolling index, right
Only by maximum glue is limited, when minimum gel material content improves coagulation in the mix-design of durability, specification
The durability of soil, is not dissolved into the index of durability in mix-design, both this method cannot be with quantitative durability
Foundation of the index as mix Design.
In addition to existing specification JGJ55-2011, there are also a kind of durable to improve concrete to improve the density of concrete
Property performance mixing proportion design method, Chen Jiankui teaches and proposes the full calculating of design of mix proportion of high performance concrete in 2000
Method, the method propose the volume-based model of concrete first, and the calculating of unit consumption of water and sand coarse aggregate ratio is derived by volume-based model
Formula.With an improved the absolute volume methods that traditional mix-design uses, but full calculating method thinks that each component has in concrete
Volume additive property, the method do not consider the activity of mineral admixture；Since the mineral admixtures such as flyash and miberal powder are with age
Difference, the extent of reaction are different.Therefore the chemical attribute of material is not considered when carrying out full calculating method and carrying out mix-design, it is false
Chemical attribute, the physical property for having determined mineral admixture are consistent with cement.
Based on this, traditional mixing proportion design method fails to work as the durability index involvement mix-design process of concrete
In, it is difficult to reach the intensity of concrete and the requirement of durability double control.Therefore mineral admixture such as flyash and water are utilized
This different feature of mud activity introduce the concept of flyash activity in mix-design, thus realize while controlling intensity and
The mixing proportion design method of durability has great importance.
Summary of the invention
The main object of the present invention is to provide one kind to set based on intensity and chloride ion permeability Two indices concrete mix
Meter method participates in the mix-design stage for chloride ion permeability index as target capabilities, designs while meeting intensity
And the concrete mix of chloride ion permeability Two indices.
The present invention propose it is a kind of based on intensity and chloride ion permeability Two indices concrete mixing proportion design method, including with
Lower step:
(1) when calculating single water mixing mud, meet the water consumption W and the first cement consumption C of Concrete Object intensityf；
(2) the second cement consumption C for meeting target chloride ion permeability is calculatedD；
The water consumption W and target chloride diffusion coefficient index D of Concrete Object intensity will be metRCMSubstitute into concrete 28d
In the relational model of chloride diffusion coefficient and the ratio of mud, inverse goes out to meet the cement consumption of target chloride ion permeability, is denoted as
Second cement consumption CD；
(3) intensity activity K is calculatedf, resistance of chloride ion penetration activity KD；
It is calculated using the corresponding intensity of 28d mineral admixture and chloride ion permeability strong with caused by identical quality cement
The ratio of degree and the ratio of chloride ion permeability, are denoted as intensity activity Kf, resistance of chloride ion penetration activity KD；
(4) mineral admixture dosage FA and cement consumption C is calculated；
Establish while meeting the cementitious material group of equations of Concrete Object intensity and chloride ion permeability Two indices:
C+Kf× FA=Cf、C+KD× FA=CD
The cementitious material includes the cement and mineral admixture, calculates mineral admixture dosage FA and cement is used
C is measured, as meets the gel material content of Concrete Object intensity and chloride ion permeability Two indices requirement simultaneously；
(5) according to the water consumption W, cement consumption C and mineral for meeting Concrete Object intensity and chloride ion permeability simultaneously
Admixture dosage FA calculates concrete mix.
Further, the mineral admixture includes flyash, miberal powder and silicon ash.
Further, when the mineral admixture is flyash, flyash intensity activity K is established respectivelyf, resisting chloride ion penetration seep
Permeability activity KDWith the relation function of FA/C, wherein FA is flyash dosage, and C is cement consumption；It is fitted to obtain formula are as follows:
Kf=0.92-0.62 × (FA/C), KD=0.97-0.51 × (FA/C).
Further, when the calculating list water mixing mud, meet the water consumption W and the first cement consumption of Concrete Object intensity
CfCalculation formula are as follows:
fcu,0=fcu,k+ 1.645 σ,
Wherein, αaWith αbFor regression coefficient, according to coarse aggregate kind value；fbFor cementitious material 28d glue sand compression strength,
fCu, 0For concrete strength Configuration Values, fCu, kFor Concrete Object intensity value, the slump of the water consumption W according to concrete, coarse aggregate
Kind, size and additive water-reducing rate β determine.
Further, the slump of the concrete is the pump concrete of 100mm-250mm.
Further, when single water mixing mud, fbCalculation formula are as follows:
fb=rc*fCe, g,
Wherein, rcFor redundancy, fCe, gFor strength of cement grade.
Further, the relational model of the 28d chloride diffusion coefficient and the ratio of mud are as follows:
Wherein a and b is the model parameter being adjusted according to cement type；Refer to for target chloride diffusion coefficient
Mark DRCM。
It is provided in the present invention be based on intensity and chloride ion permeability Two indices concrete mixing proportion design method, have with
It is lower the utility model has the advantages that
It is provided in the present invention to be based on intensity and chloride ion permeability Two indices concrete mixing proportion design method, pass through powder
Coal ash activity K value is put forward for the first time flyash for different concrete to the Different Effects of concrete strength and chloride ion permeability
Performance has different activities, using the activity value of flyash that flyash is equivalent at cement, finally obtains while meeting intensity and chlorine
The cementitious material group of equations of ion permeability participates in mix-design using chloride ion permeability index as target capabilities
The concrete mix of intensity and chloride ion permeability Two indices is designed while being met to stage.Meanwhile the design method
Mix-design suitable for other mineral admixtures such as miberal powder, silicon ashes.
Detailed description of the invention
Fig. 1 is in the embodiment of the present invention based on intensity and chloride ion permeability Two indices concrete mixing proportion design method stream
Journey schematic diagram.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
It referring to Fig.1, is that intensity and chloride ion permeability Two indices mix Design are based in the embodiment of the present invention
Method flow schematic diagram.
It is proposed in one embodiment of the invention a kind of based on intensity and chloride ion permeability Two indices mix Design
Method, comprising the following steps:
Step S1 meets the water consumption W and the first cement consumption C of Concrete Object intensity when calculating single water mixing mudf；
According to Concrete Object intensity index and design of common concrete proportioning method JGJ55-2011 " common coagulation
Native mix-design regulation " it requires, the ratio of mud W/C for meeting Concrete Object intensity in single water mixing mud is calculated, and expired
The water consumption W of sufficient Concrete Object intensity and the first cement consumption Cf。
Above-mentioned calculating meets the ratio of mud W/C calculation formula of Concrete Object intensity in single water mixing mud are as follows:
Then when above-mentioned calculating list water mixing mud, meet the water consumption W and the first cement consumption C of Concrete Object intensityfMeter
Calculate formula are as follows:
fcu,0=fcu,k+ 1.645 σ,
Above-mentioned formula is to be obtained according to existing specification JGJ55-2011 " design of common concrete proportioning regulation ".Its
In, αaWith αbFor regression coefficient, according to coarse aggregate kind value；fbFor cementitious material 28d glue sand compression strength, it can survey or lead to
Strength of cement grade is crossed multiplied by corresponding surplus coefficiert；fCu, 0For concrete strength Configuration Values；fCu, kFor Concrete Object intensity value；
Water consumption W is determined according to the water-reducing rate β of the slump of concrete, the kind of coarse aggregate, size and additive.
The slump of above-mentioned concrete is the pump concrete of 100mm-250mm.
When single water mixing mud, fbCalculation formula are as follows:
fb=rc*fCe, g
Wherein, rcFor redundancy, fCe, gFor strength of cement grade.
Step S2 calculates the second cement consumption C for meeting target chloride ion permeabilityD；
The water consumption W and target chloride diffusion coefficient index D of Concrete Object intensity will be metRCMSubstitute into concrete 28d
In the relational model of chloride diffusion coefficient and the ratio of mud, inverse goes out to meet the cement consumption of target chloride ion permeability, is denoted as
Second cement consumption CD。
The relational model of above-mentioned 28d chloride diffusion coefficient and the ratio of mud are as follows:
" chloride ion containing many factors invades having for concrete to the article that above-mentioned relation model is delivered for 2004 for Shi Yanghang
Limit Difference Calculation model " in 28d chloride diffusion coefficient and the ratio of mud model.Wherein a and b is to be carried out according to cement type
The model parameter of adjustment；For target chloride diffusion coefficient index DRCM.Target chloride diffusion coefficient is this implementation
The parameter met required for Concrete Object chloride ion permeability in example.In the present embodiment, through experiment gained, a takes 0.352, b
Take 1.34；Therefore, the second cement consumption CDCalculation formula are as follows:
Step S3 calculates intensity activity Kf, resistance of chloride ion penetration activity KD；
It is calculated using the corresponding intensity of 28d mineral admixture and chloride ion permeability strong with caused by identical quality cement
The ratio of degree and the ratio of chloride ion permeability, are denoted as intensity activity Kf, resistance of chloride ion penetration activity KD。
Further, above-mentioned mineral admixture includes flyash, miberal powder and silicon ash, is matched to different minerals admixture
When composition and division in a proportion designs, the adjustment of relevant parameter need to be only carried out according to the activity value of different minerals admixture.
Further, when above-mentioned mineral admixture is flyash, flyash activity is the as powder for cement
The ratio between contribution that the contribution that coal ash reaction generates is generated with the reaction of identical quality cement.Utilize 28d different addition quantity fine coal
The corresponding activity value of ash and intensity and chloride ion permeability, establish flyash intensity activity K respectivelyf, resistance of chloride ion penetration it is living
Property KDWith the relation function of FA/C, wherein FA is flyash dosage, and C is cement consumption；It is fitted to obtain formula are as follows:
Kf=0.92-0.62 × (FA/C), KD=0.97-0.51 × (FA/C)
Step S4 calculates mineral admixture dosage FA and cement consumption C；
Establish while meeting the cementitious material group of equations of Concrete Object intensity and chloride ion permeability Two indices:
C+Kf× FA=Cf、C+KD× FA=CD
Above-mentioned cementitious material includes cement and mineral admixture, calculates mineral admixture dosage FA and cement consumption C,
As meet the gel material content of Concrete Object intensity and chloride ion permeability Two indices requirement simultaneously.
In above-mentioned equation, C, FA are while meeting cement consumption and flyash use that intensity and chloride ion permeability require
Amount is both the required unknown number obtained.Cf、CD、Kf、KDIt has been acquired by step S1- step S3.The meaning of equation group is:
It is assumed that meeting cement consumption required for target strength when single water mixing mud is Cf, meet water required for target chloride ion permeability
Mud dosage is CD, flyash dosage is equivalent cement dosage multiplied by corresponding activity value, using flyash to different coagulation soil nature
Can the different activities value that be embodied by the equivalent equation group for finally obtaining cement consumption balance at cement of flyash.By step S3
Obtained in KfWith KDComputation model bring equation group into and have formula:
C+ (0.92-0.62 × (FA/C)) × FA=Cf
Cement consumption C and flyash dosage FA adjusted is calculated, gel material content at this time can meet by force simultaneously
The requirement of degree and chloride ion permeability.
Step S5, according to simultaneously meet Concrete Object intensity and chloride ion permeability water consumption W, cement consumption C and
Mineral admixture dosage FA calculates concrete mix；
According to water consumption W, cement consumption C and the mineral blending for meeting Concrete Object intensity and chloride ion permeability simultaneously
Mass method in material dosage FA and JGJ55-2011 " design of common concrete proportioning regulation " calculates separately sandstone dosage,
Met the Two indices concrete mix that Concrete Object intensity and chloride ion permeability require simultaneously.
There is provided in the embodiment of the present invention based on intensity and chloride ion permeability Two indices concrete mixing proportion design method,
By flyash activity K value to the Different Effects of concrete strength and chloride ion permeability, flyash is put forward for the first time for difference
Concrete performance has different activities, using the activity value of flyash that flyash is equivalent at cement, finally obtains while meeting strong
The cementitious material group of equations of degree and chloride ion permeability, participates in cooperation for chloride ion permeability index as target capabilities
Than the design phase, the concrete mix of intensity and chloride ion permeability Two indices is designed while met.Meanwhile the design
Method is also applied for the mix-design of other mineral admixtures such as miberal powder, silicon ash.
The raw material such as above-mentioned concrete coarse-fine aggregate, cement, flyash are both needed to meet JGJ55- mainly for engineering reality
The requirement of 2011 " design of common concrete proportioning regulations ".There is raw material such as recycled aggregate of other particular/special requirements etc. not herein
Research range.
In one embodiment, the mixing proportion design method by the building on land exterior wall concrete in sea is as follows:
1, Concrete Object intensity and target chloride ion permeability performance are determined:
Certain belongs to by extra large building on land exterior wall according to GB/T 50476-2008 " durability design specification "
Ocean chloride environment, environmental activity grade are determined as III-D, are to calculate for 50 years according to design life, meet durability
It is required that concrete minimum intensity be C40,28d age chloride diffusion coefficient require≤10 (1 × 10-12m of unit2/s).Both
It is required to design while meeting concrete strength >=C40 according to present case, chloride permeability coefficient is≤10 × 10-12m2/ s's
Concrete.It is C40 that concrete crushing strength is taken in the present embodiment, and chloride permeability coefficient is 10 × 10-12m2/ s is illustrated.
2, determine that concrete prepares used raw material:
According to JGJ55-2011 " design of common concrete proportioning regulation ", by concrete design strength in this present embodiment
Grade is C40, therefore chooses ordinary portland cement P.O 42.5R, prepares raw material situation in conjunction with local concrete and chooses thick bone
Expect diameter be 5-31.5mm rubble, flyash be II grade of ash of F class, water-reducing agent use water-reducing rate for 30% poly-carboxylic high-performance
Water-reducing agent.Concrete slump requires to be set to 200mm according to Practical Project.
3, concrete strength Configuration Values are calculated:
There is formula according to JGJ55-2011 " design of common concrete proportioning regulation ":
fcu,0≥fcu,k+1.645σ
F in present casecu,kFor 40MPa, standard deviation sigma takes 5MPa, calculates to obtain concrete strength Configuration Values fcu,0For 48MPa.
4, calculating meets the water consumption W of target strength and meets the first cement consumption C of intensityf:
According to JGJ55-2011 " design of common concrete proportioning regulation " water-cement ratio calculation formula:
There is formula when cementitious material only mixes cement:
F in above formulacu,0For 48MPa, when coarse aggregate is rubble, regression coefficient αaWith αb0.53 and 0.2, f are taken respectivelybFor
Cementitious material 28d glue sand compression strength, according to JGJ55-2011 " design of common concrete proportioning regulation " its calculation are as follows:
fb=rfrsfce, fce=rcfce,g,
When only water mixing mud, rf、rs1 is all taken, therefore has fb=rc*fCe, g, wherein rcFor redundancy, taken in the present embodiment
1.16；fCe, gFor strength of cement grade, strength of cement grade is 42.5 in the present embodiment；Calculate to obtain fb=1.16*42.5=
49.3MPa.Above data is brought into ratio of mud calculation formula respectively to be had:
The slump of the determination of water consumption W and concrete, the kind of coarse aggregate, size and additive water-reducing rate β have
It closes, according to JGJ55-2011 " design of common concrete proportioning regulation " table 5.2.1-2 and formula mw0=m'w0(1- β), when mixed
The solidifying soil slump requires to determine m' in formula according to table 5.2.1-2 when 200mmw0Value be diminishing that 230, β is water-reducing agent
Rate takes 30%, calculates to obtain mw0For 161kg.M in formulaw0Indicate the unit consumption of water for meeting the slump requirement when mixing water-reducing agent, both
Water consumption W=161kg in the present embodiment, when single water mixing mud, meet the first cement consumption C of intensityf=161/0.49=
329kg。
5, the second cement consumption C for meeting target chloride ion permeability when single water mixing mud is determinedD:
Second cement consumption C in step S2 according to the present inventionDCalculation formula, by water consumption W=161kg and 28d chlorine from
Sub- permeability target value(1 × 10-12m of unit2/ s) substitute into formula calculate
At this point, meeting the first cement consumption C of target strengthfFor 329kg, meet the second water of target chloride ion permeability
Mud dosage CDFor 333kg.
6, calculate while meeting the gel material content that target strength and chloride ion permeability require:
Utilize the formula equation group in step S4 of the present invention:
C+ (0.92-0.62 × (FA/C)) × FA=Cf
By Cf=329kg, CD=333kg, which substitutes into formula, to be had:
C+ (0.92-0.62 × (FA/C)) × FA=329
C+ (0.97-0.51 × (FA/C)) × FA=333
It solves above-mentioned binary quadratic equation group and obtains C=284kg, FA=56kg.
7, concrete mix is calculated:
According to having shown that water consumption W is 161kg in the present embodiment above-mentioned steps, cement consumption C is 284kg, and flyash is used
Amount FA is 56kg, therefore knows that water-cement ratio is 161/ (284+56)=0.47, and according to JGJ55-2011, " common concrete proportioning is set
Count regulation " 5.4.2 provide determine sand coarse aggregate ratio be 0.4；The bulk density that concrete is determined according to mass method is 2400kg/m3, then the use of sand
Amount is (2400-161-284-56) * 0.4=759.6kg, and stone dosage is (2400-161-284-56) * 0.6=1139.4kg；
Final to meet concrete 28d compression strength 40MPa simultaneously, chloride permeability coefficient is 10 × 10-12m2The concrete match ratio of/s
Than are as follows: water consumption W is 161kg, and cement consumption C is 284kg, and flyash dosage FA is 56kg, sand dosage 760kg, stone dosage
1139kg。
Concrete configuration is carried out according to this match ratio and is measured 28d concrete crushing strength in the case where standard curing and is
43.8MPa reaches the requirement of 28d concrete crushing strength C40；It surveys 28d chloride diffusion coefficient (being detected by RCM method)
For 9.13 × 10-12m2/ s meets 10 × 10-12m of 28d chloride diffusion coefficient target upper limit value2The requirement of/s.Thus illustrate
The two fingers of compression strength and chloride ion permeability can be met simultaneously according to concrete prepared by the concrete mixing proportion design method
Mark requires.
In another embodiment, the mixing proportion design method of bridge pier concrete is as follows:
1, Concrete Object intensity and target chloride ion permeability performance are determined:
Certain bridge pier belongs to ocean chloride ring according to GB/T 50476-2008 " durability design specification "
Border, environmental activity grade are determined as III-D, are to calculate for 50 years according to design life, meet the concrete of life requirement
Minimum intensity is C40, and 28d age chloride diffusion coefficient requires≤10 (1 × 10-12m of unit2/s).It is wanted according to the present embodiment
It asks and designs while meeting Concrete Object intensity >=C40, target chloride permeability coefficient is≤10 × 10-12m2The coagulation of/s
Soil.Concrete crushing strength C45,8 × 10-12m of chloride permeability coefficient are taken in the present embodiment2/ s is illustrated.
2, determine that concrete prepares used raw material:
According to JGJ55-2011 " design of common concrete proportioning regulation ", due to concrete design strength etc. in present case
Grade is C45, therefore chooses ordinary portland cement P.O 42.5R, prepares raw material situation in conjunction with local concrete and chooses coarse aggregate
Diameter is the rubble of 5-31.5mm, and flyash is II grade of ash of F class, and water-reducing agent uses water-reducing rate to subtract for 30% poly-carboxylic high-performance
Aqua.Concrete slump requires to be set to 150mm according to Practical Project.
3, concrete strength Configuration Values are calculated:
There is formula according to JGJ55-2011 " design of common concrete proportioning regulation ":
fcu,0≥fcu,k+1.645σ
F in present casecu,kFor 45MPa, standard deviation sigma takes 5MPa, calculates to obtain concrete strength Configuration Values fcu,0For 53MPa.
4, calculating meets the water consumption W of target strength and meets the first cement consumption C of intensityf:
According to JGJ55-2011 " design of common concrete proportioning regulation " water-cement ratio calculation formula:
There is formula when cementitious material only mixes cement:
F in formulacu,0For 53MPa, when coarse aggregate is rubble, regression coefficient αaWith αb0.53 and 0.2, f are taken respectivelybFor glue
Gel material 28d glue sand compression strength, according to JGJ55-2011 " design of common concrete proportioning regulation " its calculation are as follows:
fb=rfrsfce, fce=rcfce,g,
When only water mixing mud, rf、rs1 is all taken, therefore has fb=rc*fCe, g, wherein rcFor redundancy, taken in the present embodiment
1.16；fCe, gFor strength of cement grade, strength of cement grade is 42.5 in the present embodiment；Calculate to obtain fb=1.16*42.5=
49.3MPa.Above data is brought into ratio of mud calculation formula respectively to be had:
The slump of the determination of water consumption W and concrete, the kind of coarse aggregate, size and additive water-reducing rate β have
It closes, according to the table 5.2.1-2 and formula m in JGJ55-2011 " design of common concrete proportioning regulation "w0=m'w0(1- β),
M' in formula is determined according to table 5.2.1-2 when concrete slump requires to be 150mmw0Value be 220, β be water-reducing agent
Water-reducing rate takes 30%, calculates to obtain mw0For 154kg.M in formulaw0Indicate the flat water for meeting the slump requirement when mixing water-reducing agent
Amount, both the water consumption W=154kg in the present embodiment, when single water mixing mud, meet the first cement consumption C of intensityf=154/0.45
=342kg.
5, the second cement consumption C for meeting target chloride ion permeability when single water mixing mud is determinedD:
Second cement consumption C in step S2 according to the present inventionDCalculation formula, by water consumption W=154kg and 28d chlorine from
Sub- permeability target value(1 × 10-12m of unit2/ s) substitute into formula calculate
At this point, meeting the first cement consumption C of target strengthfFor 342kg, meet the second water of target chloride ion permeability
Mud dosage CDFor 374kg.
6, calculate while meeting the gel material content that target strength and chloride ion permeability require:
Utilize the formula equation group in step of embodiment of the present invention S4:
C+ (0.92-0.62 × (FA/C)) × FA=Cf
By Cf=342kg, CD=374kg, which substitutes into formula, to be had:
C+ (0.92-0.62 × (FA/C)) × FA=329
C+ (0.97-0.51 × (FA/C)) × FA=333
It solves above-mentioned binary quadratic equation group and obtains C=257kg, FA=221kg.
7, concrete mix is calculated:
Show that water consumption W is 154kg according to the present embodiment above-mentioned steps, cement consumption C is 257kg, flyash dosage
FA is 221kg, therefore knows that water-cement ratio is 157/ (257+221)=0.32, and according to JGJ55-2011, " common concrete proportioning is set
Count regulation " 5.4.2 provide determine sand coarse aggregate ratio be 0.4；The bulk density that concrete is determined according to mass method is 2400kg/m3, then the use of sand
Amount is (2400-154-257-221) * 0.4=707.2kg, and stone dosage is (2400-154-257-221) * 0.6=
1139.4kg；Final to meet concrete 28d compression strength 45MPa simultaneously, chloride permeability coefficient is 10 × 10-12m2/ s's is mixed
Solidifying soil match ratio are as follows: water consumption W is 154kg, and cement consumption C is 257kg, and flyash dosage FA is 221kg, sand dosage 707kg,
Stone dosage 1061kg.
Concrete configuration is carried out according to this match ratio and is measured 28d concrete crushing strength in the case where standard curing and is
47.3MPa reaching the requirement of 28d concrete crushing strength C45；It surveys 28d chloride diffusion coefficient (being detected by RCM method)
For 7.5 × 10-12m2/ s meets 8 × 10-12m of 28d chloride diffusion coefficient target upper limit value2The requirement of/s.Thus illustrate root
The Two indices of compression strength and chloride ion permeability can be met simultaneously according to concrete prepared by the concrete mixing proportion design method
It is required that.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all utilizations
Equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content is applied directly or indirectly in other correlations
Technical field, be included within the scope of the present invention.
Claims (6)
1. one kind be based on intensity and chloride ion permeability Two indices concrete mixing proportion design method, which is characterized in that including with
Lower step:
(1) when calculating single water mixing mud, meet the water consumption W and the first cement consumption C of Concrete Object intensityf；
(2) the second cement consumption C for meeting target chloride ion permeability is calculatedD；
The water consumption W and target chloride diffusion coefficient D of Concrete Object intensity will be metRCMConcrete 28d chloride ion is substituted into expand
In the relational model for dissipating coefficient and the ratio of mud, inverse goes out to meet the cement consumption of target chloride ion permeability, is denoted as the second cement
Dosage CD；
The relational model of the 28d chloride diffusion coefficient and the ratio of mud are as follows:
Wherein a and b is the model parameter being adjusted according to cement type；For target chloride diffusion coefficient index DRCM；
(3) intensity activity K is calculatedf, resistance of chloride ion penetration activity KD；
It is calculated and intensity caused by identical quality cement using the corresponding intensity of 28d mineral admixture and chloride ion permeability
The ratio of ratio and chloride ion permeability is denoted as intensity activity Kf, resistance of chloride ion penetration activity KD；
(4) mineral admixture dosage FA and cement consumption C is calculated；
Establish while meeting the cementitious material group of equations of Concrete Object intensity and chloride ion permeability Two indices:
C+Kf× FA=Cf、C+KD× FA=CD
The cementitious material includes the cement and mineral admixture, calculates mineral admixture dosage FA and cement consumption C,
As meet the gel material content of Concrete Object intensity and chloride ion permeability Two indices requirement simultaneously；
(5) according to water consumption W, cement consumption C and the mineral blending for meeting Concrete Object intensity and chloride ion permeability simultaneously
Expect dosage FA, calculates concrete mix.
2. according to claim 1 be based on intensity and chloride ion permeability Two indices concrete mixing proportion design method,
It is characterized in that, the mineral admixture includes flyash, miberal powder and silicon ash.
3. according to claim 1 be based on intensity and chloride ion permeability Two indices concrete mixing proportion design method,
It is characterized in that, when the mineral admixture is flyash, establishes flyash intensity activity K respectivelyf, resistance of chloride ion penetration activity
KDWith the relation function of FA/C, wherein FA is flyash dosage, and C is cement consumption；It is fitted to obtain formula are as follows:
Kf=0.92-0.62 × (FA/C), KD=0.97-0.51 × (FA/C).
4. according to claim 1 be based on intensity and chloride ion permeability Two indices concrete mixing proportion design method,
It is characterized in that, when the single water mixing mud of the calculating, meets the water consumption W and the first cement consumption C of Concrete Object intensityfCalculating
Formula are as follows:
fcu,0=fcu,k+ 1.645 σ,
Wherein, σ is standard deviation, αaWith αbFor regression coefficient, according to coarse aggregate kind value；fbFor cementitious material 28d glue sand resistance to compression
Intensity, fCu, 0For concrete strength Configuration Values, fCu, kFor Concrete Object intensity value, water consumption W according to the slump of concrete,
The water-reducing rate β of the kind of coarse aggregate, size and additive is determined.
5. according to claim 4 be based on intensity and chloride ion permeability Two indices concrete mixing proportion design method,
It is characterized in that, the slump of the concrete is the pump concrete of 100mm-250mm.
6. according to claim 4 be based on intensity and chloride ion permeability Two indices concrete mixing proportion design method,
It is characterized in that, when single water mixing mud, fbCalculation formula are as follows:
fb=rc*fCe, g,
Wherein, rcFor redundancy, fCe, gFor strength of cement grade.
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| CN103992076A (en) * | 2014-05-27 | 2014-08-20 | 广西大学 | Design method of concrete mix ratio based on requirements of index of resistance to chloride ion intrusion and strength index |
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