CN106892623B - Metakaolin concrete and mixing proportion design method for ultra-large volume structure - Google Patents
Metakaolin concrete and mixing proportion design method for ultra-large volume structure Download PDFInfo
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- CN106892623B CN106892623B CN201710197625.5A CN201710197625A CN106892623B CN 106892623 B CN106892623 B CN 106892623B CN 201710197625 A CN201710197625 A CN 201710197625A CN 106892623 B CN106892623 B CN 106892623B
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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
-
- 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
- C04B40/0039—Premixtures of ingredients
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
Abstract
Metakaolin concrete and mixing proportion design method for ultra-large volume structure.The concrete is formed by 1016~1072kg of rubble, 825~848kg of fine work Machine-made Sand, 213~282kg of PO42.5 cement, II grades of 37~43kg of flyash, 51~80kg of S75 slag powders, 22~26kg of metakaolin, 22~26kg of I type UEA swelling agent, 0.6~1.5kg of polypropylene fibre, 6.26~8.13kg of slow-setting polycarboxylic acid water reducing agent, water 163~176kg mixed preparing.The method of the present invention uses aggregate closely packed model, rubble gap, cementitious material slurry package and the design method for filling fine work Machine-made Sand gap are wrapped up and filled based on mortar, realize the tightly packed of concrete each component, be conducive to improve the intensity of concrete and improve the mobility of concrete, gel material content can be reduced simultaneously, reduce the system heat of hydration.
Description
Technical field
The present invention relates to Concrete technical fields, metakaolin concrete particularly for ultra-large volume structure and
Mixing proportion design method.
Background technique
Ultra-large volume concrete structure size is big, and concrete one-time-concreting amount is big, and the heat that hydrated cementitious is released is difficult to release
It puts, Yi Yinqi internal structure temperature increases, and when forming big inside and outside temperature difference, will generate and split in inside concrete or surface
Seam.This thermal cracking is one of principal element of concrete bracing, often the harmful cracks of penetrability, to structure
Impermeability, globality, durability even bearing capacity are very unfavorable.In recent years, with the hair of super high-rise building and industrial building
Exhibition largely using large-scale raft foundations, box foundation and cushion cap foundation, to the globality of concrete, intensity, volume stability and
Durability proposes requirements at the higher level, and the Crack Control problem of ultra-large volume concrete is faced with severe challenge.Currently, ultra-large volume
Concrete mainly uses pumping technology to construct, there are slump-loss, tube wall lubrication thickness to reduce in pumping procedure for concrete,
Plugging etc. is unfavorable for the case where pumping, for the pumpability requirements for meeting concrete, it is desirable that fresh concrete has high workability.Cause
How this, ensure that ultra-large volume concrete had both met the intensity of concrete, rigidity, globality, durability and pump concrete
High workability requirement, and can preferably control temperature stress, concrete surface crack and contraction fissure problem, it has also become engineering circles
It pays close attention to for a long time and is dedicated to the important problem urgently solved.
Effectively to control ultra-large volume concrete cracking, it is necessary to according to its thermal cracking feature, from the temperature for reducing concrete
Degree and contraction distortion, raising Tensile strength and volume stability angle are set out, in conjunction with local resource characteristics, preferred raw material
And optimized mix-proportion, the ability of concrete anti-crack ability itself and resistance to deformation is improved, guarantees that overlength ultra-large volume concrete removes
Meet and design, outside construction requirement intensity, also meets the requirement of " high-strength, high tenacity, high cracking resistance, Gao Naijiu ".
Summary of the invention
It is an object of the invention to solve the shortcomings of the prior art, provide a kind of for the higher of ultra-large volume structure
Ridge earth concrete and its mixing proportion design method, to realize the most compact reactor of concrete each component, improve concrete intensity and
Improve the mobility of concrete, while reducing the adiabatic temperature rise of ultra-large volume concrete and reducing itself aquation and shrinking.
The purpose of the present invention is what is be achieved through the following technical solutions.
For the metakaolin concrete of ultra-large volume structure, which is by rubble, fine work Machine-made Sand, PO42.5
Cement, II grade flyash, S75 slag powders, metakaolin, I type UEA swelling agent, polypropylene fibre, slow-setting polycarboxylic acid water reducing agent
It is formed with water mixed preparing, the quality proportioning of folk prescription concrete each component is as follows: 1016~1072kg of rubble, fine work Machine-made Sand
825~848kg, 213~282kg of PO42.5 cement, II grades of 37~43kg of flyash, 51~80kg of S75 slag powders, higher ridge
22~26kg of soil, 22~26kg of I type UEA swelling agent, 0.6~1.5kg of polypropylene fibre, slow-setting polycarboxylic acid water reducing agent 6.26~
8.13kg, 163~176kg of water；The slow-setting polycarboxylic acid water reducing agent is that a kind of water-reducing rate is greater than 28%, concrete retarding time
It is less than 10mm metakaolin concrete special function polycarboxylate water-reducer greater than 8h, 2h slump-loss, by following mass ratio
Component compound: high water reduction polycarboxylic acids mother liquor 6%~8%, high-thin arch dam polycarboxylic acids mother liquor 4%~5%, sustained-release polycarboxylic
Mother liquor 2%~3%, sodium gluconate 1.5%~2.5%, sucrose 1.5%~2.5%, polyethers air entraining agent 0.03%~
0.04%, organic silicon defoaming agent 0.01%~0.02%, surplus are water, and wherein the solid content of polycarboxylic acids mother liquor is 40%.
Metakaolin of the present invention is Al2O3Content is greater than 35%wt, SiO2Content is greater than 50%wt, Fe2O3And TiO2
Total content is greater than the low-quality metakaolin of high-Fe-Ti of 1%wt.The fine work Machine-made Sand is content of stone powder no more than 8%, MB value
No more than sand in the area II that 0.75, fineness modulus is 2.6~3.0.The polypropylene fibre be elasticity modulus not less than 3.0GPa,
Monfil of the tensile strength not less than 300MPa, draw ratio not less than 300, length 12mm, volume are 0.6~1.5kg/m3。
The mixing proportion design method of metakaolin concrete of the present invention for ultra-large volume structure, including following step
It is rapid:
(1) the volume V of rubble is determinedgWith quality mg, calculation method is as follows:
mg=Vg×ρg
In formula: VgThe volume of rubble, m3；ρgThe apparent density of rubble, kg/m3；ρLgThe bulk density of rubble, kg/m3；
SgThe specific surface area of rubble, m2/kg；hmWrap up the screed thickness of rubble, m；mgThe quality of rubble, kg；
(2) the volume V of fine work Machine-made Sand is determinedsWith quality ms, calculation method is as follows:
ms=Vs×ρs
In formula: VsThe volume of fine work Machine-made Sand, m3；ρsThe apparent density of fine work Machine-made Sand, kg/m3；ρLsFine work mechanism
The bulk density of sand, kg/m3；SsThe specific surface area of fine work Machine-made Sand, m2/kg；hpThe paste thickness of fine work Machine-made Sand is wrapped up,
m；msThe quality of fine work Machine-made Sand, kg；
(3) the apparent density ρ of cementitious material is determinedB, calculation method is as follows:
In formula: ρBThe apparent density of cementitious material, kg/m3；ρCThe apparent density of cement, kg/m3；ρFThe table of flyash
See density, kg/m3；ρsThe apparent density of slag powders, kg/m3；ρMThe apparent density of metakaolin, kg/m3；ρESwelling agent
Apparent density, kg/m3；βCCement accounts for the mass percent of cementitious material, %；βFFlyash accounts for the quality percentage of cementitious material
Number, %；βSSlag powders account for the mass percent of cementitious material, %；βMMetakaolin accounts for the mass percent of cementitious material, %；
βESwelling agent accounts for the mass percent of cementitious material, %；
(4) concrete preparation strength f is determined according to the regulation of " design of common concrete proportioning regulation " JGJ 55Cu, 0With
The water-cement ratio m of concretew/mB；
(5) the quality m of the cementitious material of concrete is determinedB, cement quality mC, flyash quality mF, slag powders matter
Measure mS, metakaolin quality mM, swelling agent quality mE, water quality mW, slow-setting polycarboxylic acid water reducing agent quality mca, meter
Calculation method is as follows:
mC=mB×βc
mF=mB×βF
mS=mB×βS
mM=mB×βM
mE=mB×βE
mW=mB×(mW/mB)
mca=mB×α
In formula: mW/mBThe water-cement ratio of concrete；ρWThe apparent density of water, kg/m3；VaThe volume of air, m3, non-bleed
Type concrete takes 0.01m3；mBThe quality of cementitious material, kg；mCThe quality of cement, kg；mFThe quality of flyash, kg；mSMine
The quality of ground-slag, kg；mMThe quality of metakaolin, kg；mEThe quality of swelling agent, kg；mWThe quality of water, kg；mcaRetardation setting type
The quality of polycarboxylate water-reducer, kg；α-slow-setting polycarboxylic acid water reducing agent accounts for the mass percent of cementitious material, %.
The specific surface area of rubble of the present invention and the screed thickness of package rubble can carry out value according to rubble grade,
When rubble grade is 5~31.5mm continuous grading, the specific surface area of rubble is 0.45m2/ kg wraps up the mortar thickness of rubble
Degree is 1.25 × 10-3m；When rubble grade is 5~25mm continuous grading, the specific surface area of rubble is 0.50m2/ kg is wrapped up broken
The screed of stone is with a thickness of 1.15 × 10-3m。
The specific surface area of fine work Machine-made Sand of the present invention and the paste thickness of package fine work Machine-made Sand are according to fine work mechanism
The fineness modulus of sand carries out value, and when the fineness modulus of fine work Machine-made Sand is 2.6, the specific surface area of fine work Machine-made Sand is
5.10m2/ kg wraps up the screed of fine work Machine-made Sand with a thickness of 4.5 × 10-5m；When the fineness modulus of fine work Machine-made Sand is 2.7
When, the specific surface area of fine work Machine-made Sand is 4.95m2/ kg wraps up the screed of fine work Machine-made Sand with a thickness of 4.5 × 10-5m；Work as essence
When the fineness modulus of product Machine-made Sand is 2.8, the specific surface area of fine work Machine-made Sand is 4.80m2/ kg wraps up the sand of fine work Machine-made Sand
Pulp layer is with a thickness of 4.5 × 10-5m；When the fineness modulus of fine work Machine-made Sand is 2.9, the specific surface area of fine work Machine-made Sand is
4.65m2/ kg wraps up the screed of fine work Machine-made Sand with a thickness of 5.0 × 10-5m；When the fineness modulus of fine work Machine-made Sand is 3.0
When, the specific surface area of fine work Machine-made Sand is 4.50m2/ kg wraps up the screed of fine work Machine-made Sand with a thickness of 5.0 × 10-5m。
The maximum outstanding advantages of the present invention are to overcome the shortcomings of the prior art, and rubble sky is wrapped up and filled from mortar
The aggregate closely packed model of gap, cementitious material slurry package and filling fine work Machine-made Sand gap sets out, and proposes a kind of for surpassing
The metakaolin concrete mixing proportion design method of massive structure realizes the most compact reactor of concrete each component, is conducive to mention
The intensity of high concrete and the mobility for improving concrete, while gel material content can be reduced, reduce ultra-large volume coagulation
The adiabatic temperature rise and reduction itself aquation contraction of soil.Metakaolin is using kaolin as raw material, through certain temperature calcined dehydration shape
At anhydrous aluminium silicate, molecules align be it is irregular, thermodynamics is presented and is situated between steady state, pozzolanic activity with higher,
It is added to the intensity for being remarkably improved concrete in concrete, volume stability, durability and corrosion resistance performance, realizes coagulation
The high performance of soil.The present invention mixes swelling agent and the volume stability of concrete can be improved in metakaolin；Mix polypropylene fibre
It effectively prevent and reduces Shrinkage Cracking of Concrete；Concrete large volume coagulation can effectively be delayed by mixing slow-setting polycarboxylic acid water reducing agent
The time that native temperature peak of hydration occurs；Comprehensively utilize II grades of flyash, S75 slag powders and the low-grade metakaolin of high-Fe-Ti, drop
Low system cement consumption and the reduction system heat of hydration.The present invention is integrated to use " muti-added technology ", II grades of flyash of comprehensive utilization,
S75 slag powders and the low-grade metakaolin of high-Fe-Ti reduce system cement consumption and reduce the system heat of hydration；Simultaneously from being based on
The concrete closestpacking reason of mortar package and filling coarse aggregate gap, cementitious material slurry package and filling fine aggregate gap
By setting out, the dosage of cement in concrete gel material is greatly reduced, foring has high durable, high volume stability, senior engineer
The metakaolin concrete for the property made solves the big technical problem of the cracking risk of ultra-large volume structural concrete, is greatly reduced
The cracking risk of concrete and improve concrete durability.The present invention can be widely applied to the overlength super large body of civil engineering
Product Concrete Crack Control, can also realize the comprehensive utilization of resources of solid waste, have significant social benefit and economy
Benefit.
Specific embodiment
Metakaolin concrete of the present invention for ultra-large volume structure is by rubble, fine work Machine-made Sand, P
O42.5 cement, II grade flyash, S75 slag powders, metakaolin, I type UEA swelling agent, polypropylene fibre, retardation setting type polycarboxylic acids
Water-reducing agent and water are formed by certain match ratio mixed preparing, and the quality proportioning of folk prescription concrete each component is as follows: rubble 1016
~1072kg, 825~848kg of fine work Machine-made Sand, 42.5 213~282kg of cement of PO, II grades of 37~43kg of flyash, S75
51~80kg of slag powders, 22~26kg of metakaolin, 22~26kg of I type UEA swelling agent, 0.6~1.5kg of polypropylene fibre, delay
Solidifying 6.26~8.13kg of type polycarboxylate water-reducer, 163~176kg of water.
Mixing proportion design method of the present invention for the metakaolin concrete of ultra-large volume structure, comprising the following steps:
(1) the volume V of rubble is determinedgWith quality mg, calculation method is as follows:
mg=Vg×ρg
In formula: VgThe volume of rubble, m3；ρgThe apparent density of rubble, kg/m3；ρLgThe bulk density of rubble, kg/m3；
SgThe specific surface area of rubble, m2/kg；hmWrap up the screed thickness of rubble, m；mgThe quality of rubble, kg；
(2) the volume V of fine work Machine-made Sand is determinedsWith quality ms, calculation method is as follows:
ms=Vs×ρs
In formula: VsThe volume of fine work Machine-made Sand, m3；ρsThe apparent density of fine work Machine-made Sand, kg/m3；ρLsFine work mechanism
The bulk density of sand, kg/m3；SsThe specific surface area of fine work Machine-made Sand, m2/kg；hpThe paste thickness of fine work Machine-made Sand is wrapped up,
m；msThe quality of fine work Machine-made Sand, kg；
(3) the apparent density ρ of cementitious material is determinedB, calculation method is as follows:
In formula: ρBThe apparent density of cementitious material, kg/m3；ρCThe apparent density of cement, kg/m3；ρFThe table of flyash
See density, kg/m3；ρSThe apparent density of slag powders, kg/m3；ρMThe apparent density of metakaolin, kg/m3；ρESwelling agent
Apparent density, kg/m3；βCCement accounts for the mass percent of cementitious material, %；βFFlyash accounts for the quality percentage of cementitious material
Number, %；βSSlag powders account for the mass percent of cementitious material, %；βMMetakaolin accounts for the mass percent of cementitious material, %；
βESwelling agent accounts for the mass percent of cementitious material, %；
(4) concrete preparation strength f is determined according to the regulation of " design of common concrete proportioning regulation " JGJ 55Cu, 0With
The water-cement ratio m of concreteW/mB。
(5) the quality m of the cementitious material of concrete is determinedB, cement quality mC, flyash quality mF, slag powders matter
Measure mS, metakaolin quality mM, swelling agent quality mE, water quality mW, slow-setting polycarboxylic acid water reducing agent quality mca, meter
Calculation method is as follows:
mC=mB×βc
mF=mB×βF
mS=mB×βS
mM=mB×βM
mE=mB×βE
mW=mB×(mW/mB)
mca=mB×α
In formula: mW/mBThe water-cement ratio of concrete；ρWThe apparent density of water, kg/m3；VaThe volume of air, m3, non-bleed
Type concrete takes 0.01m3；mBThe quality of cementitious material, kg；mCThe quality of cement, kg；mFThe quality of flyash, kg；mSMine
The quality of ground-slag, kg；mMThe quality of metakaolin, kg；mEThe quality of swelling agent, kg；mWThe quality of water, kg；mcaRetardation setting type
The quality of polycarboxylate water-reducer, kg；α-slow-setting polycarboxylic acid water reducing agent accounts for the mass percent of cementitious material, %.
The specific surface area of rubble of the present invention and the screed thickness of package rubble can be carried out according to rubble grade by table 1
Value.
The specific surface area of the rubble of 1 size fractionated of table and the screed thickness of package rubble
The specific surface area of fine work Machine-made Sand of the present invention and the paste thickness of package fine work Machine-made Sand can be according to fine work machines
The fineness modulus of sand processed carries out value by table 2.
The specific surface area of the fine work Machine-made Sand of 2 different fineness modulus of table and the screed thickness of package fine work Machine-made Sand
| Fineness modulus | Specific surface area (the m of fine work Machine-made Sand2/kg) | Wrap up the layer of slurry thickness (m) of fine work Machine-made Sand |
| 2.6 | 5.10 | 4.5×10-s |
| 2.7 | 4.95 | 4.5×10-5 |
| 2.8 | 4.80 | 4.5×10-5 |
| 2.9 | 4.65 | 5.0×10-5 |
| 3.0 | 4.50 | 5.0×10-5 |
Metakaolin of the present invention is Al2O3Content is greater than 35%wt, SiO2Content is greater than 50%wt, Fe2O3And TiO2
Total content is greater than the low-quality metakaolin of high-Fe-Ti of 1%wt.The slow-setting polycarboxylic acid water reducing agent is that a kind of water-reducing rate is greater than
28%, the concrete retarding time is greater than 8h, 2h slump-loss and is less than 10mm, for the metakaolin of overlength ultra-large volume structure
Concrete special function polycarboxylate water-reducer, including following components compound: high water reduction polycarboxylic acids mother liquor 6%~8%, height
Guarantor is collapsed polycarboxylic acids mother liquor 4%~5%, sustained-release polycarboxylic mother liquor 2%~3%, sodium gluconate 1.5%~2.5%, sucrose
1.5%~2.5%, polyethers air entraining agent 0.03%~0.04%, organic silicon defoaming agent 0.01%~0.02%, water are remaining
Amount.The fine work Machine-made Sand is content of stone powder no more than the area II that 8%, MB value is 2.6~3.0 no more than 0.75, fineness modulus
Middle sand.The polypropylene fibre is that elasticity modulus is not less than not less than 3.0GPa, tensile strength not less than 300MPa, draw ratio
300, the monfil of length 12mm, volume are 0.6~1.5kg/m3.The design strength grade of concrete of the present invention is
C30~C45.
The related performance indicators of rubble used in following example 1~4 are shown in Table 3；The related performance indicators of fine work Machine-made Sand used
It is shown in Table 4；The water-reducing rate of slow-setting polycarboxylic acid water reducing agent used is greater than 28%, solid content 15.2%, each component content and property
Energy index is shown in Table 5 and table 6 respectively, and wherein the solid content of polycarboxylic acids mother liquor is 40%；Cement used is Yunnan state-run assets cement east fine horse
42.5 cement of PO of Co., Ltd's production, density 3.15g/cm3, 3d compression strength 27.0MPa, 28d compression strength
48.5MPa；Flyash used is Yunnan Heng Yang Industrial Co., Ltd. II grade flyash, density 2.48g/cm3, 45 μm tail over
10.9%, loss on ignition 2.09%, water demand ratio 98.0%, SO3Content is 0.24%；Slag powders used are Yuxi three and novel build
Material Technology Co., Ltd. S75 slag powders, specific surface area 382m2/ kg, density 2.84g/cm3, 7d activity index 57%, 28d activity
Index 79%, mortar fluidity ratio 99%；The Al of metakaolin used2O3Content is 37.7%wt, SiO2Content is 53.6%
Wt, Fe2O3And TiO2Total content is 2.65%wt, specific surface area 23000m2/ kg, density 2.66g/cm3, 3d activity index
93.8%, 7d activity index 103.9%, 28d activity index 112.4%.The elasticity modulus of polypropylene fibre used be 3.7GPa,
Tensile strength is 359MPa, the monfil of draw ratio 343, length 12mm, and volume is 0.6~1.2kg/m3；Expansion used
Agent is I type UEA swelling agent, density 2.84g/cm3, 7d limited expansion rate 0.026% in water, 21d limited expansion rate-in air
0.011%；Water used is Kunming tap water.
The related performance indicators of rubble used in 3 1~example of example 4 of table
| Number | Grade | Bulk density (kg/m3) | Apparent density (kg/m3) | Crush index (%) | Elongated particles (%) | Clay content (%) |
| Example 1 | 5~31.5mm continuous grading | 1510 | 2710 | 10.6 | 1.4 | 0.15 |
| Example 2 | 5~31.5mm continuous grading | 1520 | 2740 | 9.5 | 2.1 | 0.12 |
| Example 3 | 5~31.5mm continuous grading | 1480 | 2700 | 11.7 | 1.8 | 0.16 |
| Example 4 | 5~25mm continuous grading | 1540 | 2730 | 8.6 | 2.5 | 0.20 |
The related performance indicators of fine work Machine-made Sand used in 4 1~example of example 4 of table
| Number | Gradation | Bulk density (kg/m3) | Apparent density (kg/m3) | Fineness modulus | Crush index (%) | Content of stone powder (%) | MB value |
| Example 1 | Sand in the area II | 1640 | 2700 | 2.8 | 10.9 | 7.0 | 0.25 |
| Example 2 | Sand in the area II | 1620 | 2710 | 3.0 | 14.8 | 5.7 | 0.25 |
| Example 3 | Sand in the area II | 1620 | 2720 | 2.9 | 9.6 | 8.0 | 0.50 |
| Example 4 | Sand in the area II | 1680 | 2740 | 2.6 | 13.8 | 6.7 | 0.50 |
Slow-setting polycarboxylic acid water reducing agent related component content used in 5 1~example of example 4 of table
Example 1
C30 metakaolin concrete for ultra-large volume structure is by rubble, fine work Machine-made Sand, PO42.5 cement, II
Grade flyash, S75 slag powders, metakaolin, I type UEA swelling agent, polypropylene fibre, slow-setting polycarboxylic acid water reducing agent and water are pressed
Certain match ratio mixed preparing forms, and the quality proportioning of folk prescription concrete each component is as follows: rubble 1025kg, fine work Machine-made Sand
213kg, II grades of flyash 37kg, S75 slag powders 74kg, metakaolin 22kg, I type UEA expansions of 839kg, PO42.5 cement
Agent 22kg, polypropylene fibre 0.6kg, slow-setting polycarboxylic acid water reducing agent 6.26kg, water 176kg.The mix-design of concrete according to
Secondary volume (the V for sequentially including the following steps: (1) and determining rubbleg) and quality (mg),mg=Vg×ρg=0.3782 × 2710=
1025kg.(2) volume (V of fine work Machine-made Sand is determineds) and quality (ms), ms=Vs×ρs=0.3108 × 2700=839kg.(3) cementitious material table is determined
See density (ρB), (4) concrete preparation strength is determined according to the regulation of " design of common concrete proportioning regulation " JGJ 55
(fCu, 0) and concrete water-cement ratio (mW/mB), it is computed fCu, 0=38.2MPa, mW/mB=0.48.(5) the gelling material of concrete is determined
Quality (the m of materialB), the quality (m of cementC), the quality (m of flyashF), the quality (m of slag powdersS), the quality (m of metakaolinM), it is swollen
Quality (the m of swollen dose of quality (mE), waterW), the quality (m of slow-setting polycarboxylic acid water reducing agentca), mC=mB×βc=368 × 58%=213kg, mF=mB×βF=368 × 10%=
37kg, mS=mB×βS=368 × 20%=74kg, mM=mB×βM=368 × 6%=22kg, mE=mB×βE=368 × 6%
=22kg, mW=mB×(mw/mB)=368 × 0.48=176kg, mca=mB× α=368 × 1.7%=6.26kg.Embodiment 1
Concrete mix be shown in Table 6, the mix physical performance and mechanical property of concrete are shown in Table 7, the volume stability of concrete and resistance to
Long performance is shown in Table 8.
Example 2
C35 metakaolin concrete for ultra-large volume structure is by rubble, fine work Machine-made Sand, PO42.5 cement, II
Grade flyash, S75 slag powders, metakaolin, I type UEA swelling agent, polypropylene fibre, slow-setting polycarboxylic acid water reducing agent and water are pressed
Certain match ratio mixed preparing forms, and the quality proportioning of folk prescription concrete each component is as follows: rubble 1031kg, fine work Machine-made Sand
233kg, II grades of flyash 40kg, S75 slag powders 80kg, metakaolin 24kg, I type UEA expansions of 830kg, PO42.5 cement
Agent 24kg, polypropylene fibre 0.9kg, slow-setting polycarboxylic acid water reducing agent 7.22kg, water 172kg.The mix-design of concrete according to
Secondary volume (the V for sequentially including the following steps: (1) and determining rubbleg) and quality (mg),mg=Vg×ρg=0.3763 × 2740=
1031kg.(2) volume (V of fine work Machine-made Sand is determineds) and quality (ms), ms=Vs×ρs=0.3061 × 2710=830kg.(3) cementitious material table is determined
See density (ρB), (4) concrete preparation strength is determined according to the regulation of " design of common concrete proportioning regulation " JGJ 55
(fCu, 0) and concrete water-cement ratio (mW/mB), it is computed fCu, 0=43.2MPa, mW/mB=0.43.(5) gelling of concrete is determined
Quality (the m of materialB), the quality (m of cementC), the quality (m of flyashF), the quality (m of slag powdersS), the quality (m of metakaolinM)、
Quality (the m of swelling agentE), the quality (m of waterW), the quality (m of slow-setting polycarboxylic acid water reducing agentca), mC=mB×βc=401 × 58%=233kg, mF=mB×βF=401 × 10%=
40kg, mS=mB×βS=401 × 20%=80kg, mM=mB×βM=401 × 6%=24kg, mE=mB×βE=401 × 6%
=24kg, mW=mB×(mW/mB)=401 × 0.43=172kg, mca=mB× α=401 × 1.8%=7.22kg.Embodiment 2
Concrete mix be shown in Table 6, the mix physical performance and mechanical property of concrete are shown in Table 7, the volume stability of concrete and resistance to
Long performance is shown in Table 8.
Example 3
C40 metakaolin concrete for ultra-large volume structure is by rubble, fine work Machine-made Sand, PO42.5 cement, II
Grade flyash, S75 slag powders, metakaolin, I type UEA swelling agent, polypropylene fibre, slow-setting polycarboxylic acid water reducing agent and water are pressed
Certain match ratio mixed preparing forms, and the quality proportioning of folk prescription concrete each component is as follows: rubble 1016kg, fine work Machine-made Sand
267kg, II grades of flyash 42kg, S75 slag powders 64kg, metakaolin 25kg, I type UEA expansions of 825kg, PO42.5 cement
Agent 25kg, polypropylene fibre 0.9kg, slow-setting polycarboxylic acid water reducing agent 7.61kg, water 168kg.The mix-design of concrete according to
Secondary volume (the V for sequentially including the following steps: (1) and determining rubbleg) and quality (mg),mg=Vg×ρg=0.3764 × 2700=
1016kg.(2) volume (V of fine work Machine-made Sand is determineds) and quality (ms), ms=Vs×ρs=0.3034 × 2720=825kg.(3) cementitious material table is determined
See density (ρB), (4) concrete preparation strength is determined according to the regulation of " design of common concrete proportioning regulation " JGJ 55
(fCu, 0) and concrete water-cement ratio (mW/mB), it is computed fCu, 0=48.2MPa, mW/mB=0.40.(5) gelling of concrete is determined
Quality (the m of materialB), the quality (m of cementC), the quality (m of flyashF), the quality (m of slag powdersS), the quality (m of metakaolinM)、
Quality (the m of swelling agentE), the quality (m of waterW), the quality (m of slow-setting polycarboxylic acid water reducing agentca), mC=mB×βc=423 × 63%=267kg, mF=mB×βF=423 × 10%=
42kg, mS=mB×βS=423 × 15%=64kg, mM=mB×βM=423 × 6%=25kg, mE=mB×βE=423 × 6%
=25kg, mW=mB×(mW/mB)=423 × 0.40=168kg, mca=mB× α=423 × 1.8%=7.61kg.Embodiment 3
Concrete mix be shown in Table 6, the mix physical performance and mechanical property of concrete are shown in Table 7, the volume stability of concrete and resistance to
Long performance is shown in Table 8.
Example 4
C45 metakaolin concrete for ultra-large volume structure is by rubble, fine work Machine-made Sand, PO42.5 cement, II
Grade flyash, S75 slag powders, metakaolin, I type UEA swelling agent, polypropylene fibre, slow-setting polycarboxylic acid water reducing agent and water are pressed
Certain match ratio mixed preparing forms, and the quality proportioning of folk prescription concrete each component is as follows: rubble 1027kg, fine work Machine-made Sand
282kg, II grades of flyash 43kg, S75 slag powders 51kg, metakaolin 26kg, I type UEA expansions of 848kg, PO42.5 cement
Agent 26kg, polypropylene fibre 1.5kg, slow-setting polycarboxylic acid water reducing agent 8.13kg, water 163kg.The mix-design of concrete according to
Secondary volume (the V for sequentially including the following steps: (1) and determining rubbleg) and quality (mg),mg=Vg×ρg=0.3762 × 2730=
1027kg.(2) volume (V of fine work Machine-made Sand is determineds) and quality (ms), ms=Vs×ρs=0.3094 × 2740=848kg.(3) cementitious material table is determined
See density (ρB), (4) concrete preparation strength is determined according to the regulation of " design of common concrete proportioning regulation " JGJ 55
(fCu, 0) and concrete water-cement ratio (mW/mB), it is computed fCu, 0=53.2MPa, mW/mB=0.38.(5) gelling of concrete is determined
Quality (the m of materialB), the quality (m of cementC), the quality (m of flyashF), the quality (m of slag powdersS), the quality (m of metakaolinM)、
Quality (the m of swelling agentE), the quality (m of waterW), the quality (m of slow-setting polycarboxylic acid water reducing agentca), mC=mB×βc=428 × 66%=283kg, mF=mB×βF=428 × 10%=
43kg, mS=mB×βS=428 × 12%=51kg, mM=mB×βM=428 × 6%=26kg, mE=mB×βE=412 × 6%
=26kg, mW=mB×(mW/mB)=428 × 0.38=163kg, mca=mB× α=428 × 1.9%=8.13kg.Embodiment 4
Concrete mix be shown in Table 6, the mix physical performance and mechanical property of concrete are shown in Table 7, the volume stability of concrete and resistance to
Long performance is shown in Table 8.
Table 6 is used for the metakaolin concrete mix of overlength ultra-large volume structure
Table 7 is used for the metakaolin concrete mixture characteristic and mechanical property of overlength ultra-large volume structure
Table 8 is used for the metakaolin volume stability of concrete and endurance quality of overlength ultra-large volume structure
By table 7 and 8 data of table it is found that the C30 designed by the invention for ultra-large volume structure of 1~example of embodiment 4
~C45 metakaolin concrete mixture characteristic is good, has excellent workability, holds the time less than 15s, initial slump
Degree reaches 220mm or more, and the 2h slump reaches 200mm or more, and 2h Slump Time losing of Large is not more than 20mm, and the presetting period is greater than
14h, 28d intensity reach design strength 122%~137%, and 60d intensity reaches design strength 138%~157%, and intensity meets
Design requirement simultaneously has larger affluence；Metakaolin concrete volume stability with higher and endurance quality, 14d limitation in water
Expansion rate is greater than 0.10%, and 28d limited expansion rate is greater than 0.05% in air, and cracking resistance grade is L-III；C30~C35 concrete
Seepage-resistant grade reach P10 or more, chloride-penetration resistance grade reaches Q-IV；The seepage-resistant grade of C40~C45 concrete reaches
P12 or more, chloride-penetration resistance grade reach Q-V.As it can be seen that being made using design method of the invention has height durable, high
The metakaolin concrete for overlength ultra-large volume structure of volume stability, high workability, at the same realize II grades of flyash,
The comprehensive utilization of resources of the low-quality metakaolin of S75 slag powders, high-Fe-Ti, with certain rationality of technique and economy and significantly
Economic results in society.
The present invention has the low product of high-Fe-Ti of high volume stability by tightly packed, the comprehensive utilization of concrete each component
Position metakaolin and the integrated adiabatic temperature rise for reducing overlength ultra-large volume concrete for using " muti-added technology " scientific and reasonable and
Reduce the contraction of itself aquation, forms the metakaolin concrete with high durable, high volume stability, high workability.
Claims (7)
1. being used for the metakaolin concrete of ultra-large volume structure, which is characterized in that the concrete is by rubble, fine work mechanism
Sand, PO42.5 cement, II grades of flyash, S75 slag powders, metakaolin, I type UEA swelling agent, polypropylene fibre, retardation setting type
Polycarboxylate water-reducer and water mixed preparing form, and the quality proportioning of folk prescription concrete each component is as follows: 1016~1072kg of rubble,
825~848kg of fine work Machine-made Sand, 213~282kg of PO42.5 cement, II grades of 37~43kg of flyash, S75 slag powders 51~
80kg, 22~26kg of metakaolin, 22~26kg of I type UEA swelling agent, 0.6~1.5kg of polypropylene fibre, retardation setting type polycarboxylic acids
6.26~8.13kg of water-reducing agent, 163~176kg of water；The slow-setting polycarboxylic acid water reducing agent is that a kind of water-reducing rate is greater than 28%, is mixed
Solidifying soil retarding time is greater than 8h, 2h slump-loss and is less than 10mm metakaolin concrete special function polycarboxylate water-reducer,
Compounded by the component of following mass ratio: high water reduction polycarboxylic acids mother liquor 6%~8%, high-thin arch dam polycarboxylic acids mother liquor 4%~5%,
Sustained-release polycarboxylic mother liquor 2%~3%, sodium gluconate 1.5%~2.5%, sucrose 1.5%~2.5%, polyethers air entraining agent
0.03%~0.04%, organic silicon defoaming agent 0.01%~0.02%, surplus are water, and wherein the solid content of polycarboxylic acids mother liquor is
40%.
2. the metakaolin concrete according to claim 1 for ultra-large volume structure, which is characterized in that described higher
Ridge soil is Al2O3Content is greater than 35%wt, SiO2Content is greater than 50%wt, Fe2O3And TiO2Total content is greater than the high-Fe-Ti of 1%wt
Low-quality metakaolin.
3. the metakaolin concrete according to claim 1 for ultra-large volume structure, which is characterized in that the fine work
Machine-made Sand is that content of stone powder is not more than sand in the area II that 0.75, fineness modulus is 2.6~3.0 no more than 8%, MB value.
4. the metakaolin concrete according to claim 1 for ultra-large volume structure, which is characterized in that described poly- third
Alkene fiber is that elasticity modulus is not less than 3.0GPa, tensile strength not less than 300MPa, draw ratio not less than 300, length 12mm
Monfil, volume are 0.6~1.5kg/m3。
5. such as the mix-design of the described in any item metakaolin concrete for ultra-large volume structure of Claims 1 to 4
Method, which comprises the following steps:
(1) the volume V of rubble is determinedgWith quality mg, calculation method is as follows:
mg=Vg×ρg
In formula: VgThe volume of rubble, m3；ρgThe apparent density of rubble, kg/m3；ρLgThe bulk density of rubble, kg/m3；SgIt is broken
The specific surface area of stone, m2/kg；hmWrap up the screed thickness of rubble, m；mgThe quality of rubble, kg；
(2) the volume V of fine work Machine-made Sand is determinedsWith quality ms, calculation method is as follows:
ms=Vs×ρs
In formula: VsThe volume of fine work Machine-made Sand, m3；ρsThe apparent density of fine work Machine-made Sand, kg/m3；ρLsFine work Machine-made Sand
Bulk density, kg/m3；SsThe specific surface area of fine work Machine-made Sand, m2/kg；hpWrap up the paste thickness of fine work Machine-made Sand, m；ms-
The quality of fine work Machine-made Sand, kg；
(3) the apparent density ρ of cementitious material is determinedB, calculation method is as follows:
In formula: ρBThe apparent density of cementitious material, kg/m3；ρCThe apparent density of cement, kg/m3；ρFFlyash it is apparent close
Degree, kg/m3；ρsThe apparent density of slag powders, kg/m3；ρMThe apparent density of metakaolin, kg/m3；ρESwelling agent it is apparent
Density, kg/m3；βCCement accounts for the mass percent of cementitious material, %；βFFlyash accounts for the quality percentage of cementitious material
Number, %；βSSlag powders account for the mass percent of cementitious material, %；βMMetakaolin accounts for the mass percent of cementitious material, %；
βESwelling agent accounts for the mass percent of cementitious material, %；
(4) concrete preparation strength f is determined according to the regulation of " design of common concrete proportioning regulation " JGJ 55Cu, 0And coagulation
The water-cement ratio m of soilW/mB；
(5) the quality m of the cementitious material of concrete is determinedB, cement quality mC, flyash quality mF, slag powders quality ms、
The quality m of metakaolinM, swelling agent quality mE, water quality mw, slow-setting polycarboxylic acid water reducing agent quality mca, calculation method
It is as follows:
mC=mB×βc
mF=mB×βF
mS=mB×βS
mM=mB×βM
mE=mB×βE
mW=mB×(mW/mB)
mca=mB×α
In formula: mW/mBThe water-cement ratio of concrete；ρWThe apparent density of water, kg/m3；VaThe volume of air, m3, non-research work of air entrained type is mixed
Solidifying soil takes 0.01m3；mBThe quality of cementitious material, kg；mCThe quality of cement, kg；mFThe quality of flyash, kg；mSSlag powders
Quality, kg；mMThe quality of metakaolin, kg；mEThe quality of swelling agent, kg；mWThe quality of water, kg；mcaThe poly- carboxylic of retardation setting type
The quality of sour water-reducing agent, kg；α-slow-setting polycarboxylic acid water reducing agent accounts for the mass percent of cementitious material, %.
6. the metakaolin concrete mixing proportion design method according to claim 5 for ultra-large volume structure, special
Sign is that the specific surface area of the rubble and the screed thickness of package rubble can carry out value according to rubble grade, works as rubble
When grade is 5~31.5mm continuous grading, the specific surface area of rubble is 0.45m2/ kg, wrap up the screed of rubble with a thickness of
1.25×10-3m；When rubble grade is 5~25mm continuous grading, the specific surface area of rubble is 0.50m2/ kg, wraps up rubble
Screed is with a thickness of 1.15 × 10-3m。
7. the metakaolin concrete mixing proportion design method according to claim 5 for ultra-large volume structure, special
Sign is, the paste thickness of the specific surface area of the fine work Machine-made Sand and package fine work Machine-made Sand is according to the fineness of fine work Machine-made Sand
Modulus carries out value, and when the fineness modulus of fine work Machine-made Sand is 2.6, the specific surface area of fine work Machine-made Sand is 5.10m2/ kg, packet
The screed of fine work Machine-made Sand is wrapped up in a thickness of 4.5 × 10-5m；When the fineness modulus of fine work Machine-made Sand is 2.7, fine work Machine-made Sand
Specific surface area be 4.95m2/ kg wraps up the screed of fine work Machine-made Sand with a thickness of 4.5 × 10-5m；It is thin when fine work Machine-made Sand
When degree modulus is 2.8, the specific surface area of fine work Machine-made Sand is 4.80m2/ kg wraps up the screed of fine work Machine-made Sand with a thickness of 4.5
×10-5m；When the fineness modulus of fine work Machine-made Sand is 2.9, the specific surface area of fine work Machine-made Sand is 4.65m2/ kg wraps up fine work
The screed of Machine-made Sand is with a thickness of 5.0 × 10-5m；When the fineness modulus of fine work Machine-made Sand is 3.0, the ratio table of fine work Machine-made Sand
Area is 4.50m2/ kg wraps up the screed of fine work Machine-made Sand with a thickness of 5.0 × 10-5m。
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| CN109279796B (en) * | 2018-07-05 | 2021-05-14 | 广西大学 | Design and preparation method of continuous surrounding stacking dense-grade prepared machine-made sand |
| CN109369097B (en) * | 2018-11-08 | 2021-08-03 | 中国核工业华兴建设有限公司 | Low-shrinkage low-creep anti-cracking high-performance mass concrete |
| CN109584973B (en) * | 2018-11-22 | 2021-08-13 | 中安瑞宝建设集团有限公司 | Design and preparation method of building waste powder-based ecological type ultrahigh-performance concrete |
| CN109369117A (en) * | 2018-12-26 | 2019-02-22 | 陕西天石实业有限责任公司 | Mass concrete |
| CN109534714A (en) * | 2018-12-28 | 2019-03-29 | 巩义市豫源建筑工程材料有限责任公司 | High-performance water reducing agent |
| CN109928695B (en) * | 2019-03-07 | 2021-08-03 | 广西壮族自治区水利科学研究院 | Low-heat recycled large-aggregate concrete and preparation method thereof |
| CN111153656B (en) * | 2020-01-18 | 2022-02-08 | 杭州申华混凝土有限公司 | Green slow-setting concrete and production method thereof |
| CN111377671B (en) * | 2020-04-01 | 2021-10-15 | 科利尔环保科技有限责任公司 | Design method for mixing proportion of steel slag self-compacting concrete |
| CN112115409B (en) * | 2020-09-04 | 2022-05-13 | 广东工业大学 | High-strength high-permeability concrete mix proportion design method based on aggregate characteristics |
| CN115417648A (en) * | 2022-09-29 | 2022-12-02 | 中交绿建(厦门)科技有限公司 | Preparation method of anti-erosion large-volume concrete |
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