CN106892623A - For the metakaolin concrete and mixing proportion design method of ultra-large volume structure - Google Patents

Abstract

For the metakaolin concrete and mixing proportion design method of 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 agents, 0.6~1.5kg of polypropylene fibre, 6.26~8.13kg of slow-setting polycarboxylic acid water reducing agent, water 163~176kg mixed preparings.The inventive method uses aggregate closely packed model, wrapped up based on mortar and filling rubble space, Binder Materials slurry wrap up and fill the method for designing in fine work Machine-made Sand space, realize the tightly packed of concrete each component, the intensity for being conducive to improving concrete and the mobility for improving concrete, gel material content can be reduced simultaneously, reduce the system heat of hydration.

Description

For the metakaolin concrete and mixing proportion design method of ultra-large volume structure

Technical field

The present invention relates to Concrete technical field, metakaolin concrete particularly for ultra-large volume structure and Mixing proportion design method.

Background technology

Ultra-large volume concrete physical dimension is big, and concrete one-time-concreting amount is big, and hydrated cementitious liberated heat is difficult to release Put, easily cause internal structure temperature to raise, when big inside and outside temperature difference is formed, will be produced in inside concrete or surface and split 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 high-rise building and the hair of industrial building Exhibition largely uses large-scale raft foundation, box foundation and cushion cap foundation, globality, intensity, volume stability to concrete and Durability proposes requirements at the higher level, and the Crack Control problem of ultra-large volume concrete is faced with severe challenge.At present, ultra-large volume Concrete mainly using pumping technology construct, concrete exist in pumping procedure slump-loss, tube wall lubrication thickness reduce, Plugging etc. is unfavorable for the situation of pumping, to meet the pumpability requirements of concrete, it is desirable to which fresh concrete has high workability.Cause How this, ensure that ultra-large volume concrete had both met intensity, rigidity, globality, durability and the pump concrete of concrete High workability requirement, can preferably control temperature stress, concrete surface crack and contraction fissure problem, it has also become engineering circles again The long-term important problem paid close attention to and be devoted to urgent solution.

For effectively control ultra-large volume concrete ftractures, 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, with reference to local resource characteristicses, preferred raw material And optimized mix-proportion, improve concrete anti-crack ability and the ability of resistance to deformation in itself, it is ensured that overlength ultra-large volume concrete is removed Meet outside design, construction requirement intensity, also meet the requirement of " high-strength, high tenacity, cracking resistance high, height are durable ".

The content of the invention

Deficiency it is an object of the invention to solve prior art presence, there is provided 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 reduce the adiabatic temperature rise of ultra-large volume concrete and reduce itself aquation shrinking.

The purpose of the present invention is achieved by the following technical solution.

For the metakaolin concrete of ultra-large volume structure, the concrete is by rubble, fine work Machine-made Sand, PO42.5 Cement, II grade flyash, S75 slag powders, metakaolin, I type UEA swelling agents, polypropylene fibre, slow-setting polycarboxylic acid water reducing agent 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 agents, 0.6~1.5kg of polypropylene fibre, slow-setting polycarboxylic acid water reducing agent 6.26~ 8.13kg, 163~176kg of water.

Metakaolin of the present invention is Al₂O₃Content is more than 35%wt, SiO₂Content is more than 50%wt, Fe₂O₃And TiO₂ High-Fe-Ti low-quality metakaolin of the total content more than 1%wt.The slow-setting polycarboxylic acid water reducing agent is that a kind of water-reducing rate is more than 28%th, the concrete retarding time more than 8h, 2h slump-loss be less than 10mm metakaolin concrete special function polycarboxylic acids Water reducer, is formed by the component compounding of following mass ratio：Diminishing polycarboxylic acids mother liquor 6%~8% high, 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%, poly- Ethers air entraining agent 0.03%~0.04%, organic silicon defoamer 0.01%~0.02%, balance of water, wherein polycarboxylic acids mother liquor Solid content be 40%.The fine work Machine-made Sand be content of stone powder be not more than 8%, MB values be not more than 0.75, modulus of fineness be 2.6 Sand in~3.0 II areas.The polypropylene fibre is that elastic modelling quantity is not less than 300MPa, length not less than 3.0GPa, tensile strength Than the monfil not less than 300, length 12mm, volume is 0.6~1.5kg/m in footpath³。

The mixing proportion design method of the metakaolin concrete for ultra-large volume structure of the present invention, including following step Suddenly：

(1) the volume V of rubble is determined_gWith quality m_g, computational methods are as follows：

m_g=V_g×ρ_g

In formula：V_gThe volume of-rubble, m³；ρ_gThe apparent density of-rubble, kg/m³；ρ_LgThe bulk density of-rubble, kg/m³； S_gThe specific surface area of-rubble, m²/kg；h_mThe screed thickness of-parcel rubble, m；m_gThe quality of-rubble, kg；

(2) the volume V of fine work Machine-made Sand is determined_sWith quality m_s, computational methods are as follows：

m_s=V_s×ρ_s

In formula：V_sThe volume of-fine work Machine-made Sand, m³；ρ_sThe apparent density of-fine work Machine-made Sand, kg/m³；ρ_Ls- fine work mechanism The bulk density of sand, kg/m³；S_sThe specific surface area of-fine work Machine-made Sand, m²/kg；h_pThe paste thickness of-parcel fine work Machine-made Sand, m；m_sThe quality of-fine work Machine-made Sand, kg；

(3) the apparent density ρ of Binder Materials is determined_B, computational methods are as follows：

In formula：ρ_BThe apparent density of-Binder Materials, kg/m³；ρ_cThe apparent density of-cement, kg/m³；ρ_FThe table of-flyash See density, kg/m³；ρ_SThe apparent density of-slag powders, kg/m³；ρ_MThe apparent density of-metakaolin, kg/m³；ρ_E- swelling agent Apparent density, kg/m³；β_C- cement accounts for the mass percent of Binder Materials, %；β_F- flyash accounts for the quality percentage of Binder Materials Number, %；β_S- slag powders account for the mass percent of Binder Materials, %；β_M- metakaolin accounts for the mass percent of Binder Materials, %； β_E- swelling agent accounts for the mass percent of Binder Materials, %.

(4) according to《Design of common concrete proportioning code》The regulation of JGJ 55 determines concrete preparation strength f_{Cu, 0}With The water-cement ratio m of concrete_W/m_B；

(5) the quality m of the Binder Materials of concrete is determined_B, cement quality m_C, flyash quality m_F, slag powders matter Amount m_S, metakaolin quality m_M, swelling agent quality m_E, water quality m_W, slow-setting polycarboxylic acid water reducing agent quality m_ca, meter Calculation method is as follows：

m_C=m_B×β_c

m_F=m_B×β_F

m_S=m_B×β_S

m_M=m_B×β_M

m_E=m_B×β_E

m_W=m_B×(m_W/m_B)

m_ca=m_B×α

In formula：m_W/m_BThe water-cement ratio of-concrete；ρ_WThe apparent density of-water, kg/m³；V_aThe volume of-air, m³, non-bleed Type concrete takes 0.01m³；m_BThe quality of-Binder Materials, kg；m_CThe quality of-cement, kg；m_FThe quality of-flyash, kg；m_S- ore deposit The quality of ground-slag, kg；m_MThe quality of-metakaolin, kg；m_EThe quality of-swelling agent, kg；m_WThe quality of-water, kg；m_ca- retardation setting type The quality of polycarboxylate water-reducer, kg；α-slow-setting polycarboxylic acid water reducing agent accounts for the mass percent of Binder Materials, %.

The specific surface area of rubble of the present invention and the screed thickness of parcel rubble can carry out value according to rubble grade, When rubble grade is 5~31.5mm continuous gradings, the specific surface area of rubble is 0.45m²/ kg, wraps up the mortar thickness of rubble Spend is 1.25 × 10^-3m；When rubble grade is 5~25mm continuous gradings, the specific surface area of rubble is 0.50m²/ kg, wraps up broken The screed thickness of stone is 1.15 × 10^-3m。

The specific surface area of fine work Machine-made Sand of the present invention and the paste thickness of parcel fine work Machine-made Sand are according to fine work mechanism The modulus of fineness of sand carries out value, and when the modulus of fineness of fine work Machine-made Sand is 2.6, the specific surface area of fine work Machine-made Sand is 5.10m²/ kg, the screed thickness for wrapping up fine work Machine-made Sand is 4.5 × 10^-5m；When the modulus of fineness of fine work Machine-made Sand is 2.7 When, the specific surface area of fine work Machine-made Sand is 4.95m²/ kg, the screed thickness for wrapping up fine work Machine-made Sand is 4.5 × 10^-5m；Work as essence When the modulus of fineness 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 thickness is 4.5 × 10^-5m；When the modulus of fineness of fine work Machine-made Sand is 2.9, the specific surface area of fine work Machine-made Sand is 4.65m²/ kg, the screed thickness for wrapping up fine work Machine-made Sand is 5.0 × 10^-5m；When the modulus of fineness of fine work Machine-made Sand is 3.0 When, the specific surface area of fine work Machine-made Sand is 4.50m²/ kg, the screed thickness for wrapping up fine work Machine-made Sand is 5.0 × 10^-5m。

Maximum outstanding advantages of the invention are the deficiencies for overcoming prior art presence, wrapped up from mortar and filling rubble is empty The aggregate closely packed model of gap, Binder Materials slurry parcel and filling fine work Machine-made Sand space 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 carrying The intensity of high concrete and the mobility of improvement concrete, while gel material content can be reduced, reduce ultra-large volume coagulation The adiabatic temperature rise of soil and reduction itself aquation contraction.Metakaolin is with kaolin as raw material, through uniform temperature calcined dehydration shape Into anhydrous aluminium silicate, its molecules align is irregular, thermodynamics is presented and is situated between steady state, with pozzolanic activity higher, It is added in concrete and is remarkably improved intensity, volume stability, durability and the corrosion resistance performance of concrete, realizes coagulation The high performance of soil.The present invention mixes swelling agent and metakaolin can improve the volume stability of concrete；Mix polypropylene fibre Effectively prevent and reduce Shrinkage Cracking of Concrete；Mixing slow-setting polycarboxylic acid water reducing agent can effectively delay concrete large volume coagulation The time that native temperature peak of hydration occurs；Comprehensive utilization 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 integrated use " muti-added technology " of the present invention, 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 Mortar is wrapped up and the concrete closestpacking in filling coarse aggregate space, Binder Materials slurry parcel and filling fine aggregate space is managed By setting out, the consumption of cement in concrete gel material is greatly reduced, forms with durable, high volume stability high, senior engineer The metakaolin concrete of the property made, solves the big technical barrier 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, with significant social benefit and economy Benefit.

Specific embodiment

Metakaolin concrete for ultra-large volume structure of the present invention, is by rubble, fine work Machine-made Sand, P O42.5 cement, II grade flyash, S75 slag powders, metakaolin, I type UEA swelling agents, polypropylene fibre, retardation setting type polycarboxylic acids Water reducer 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, 213~282kg of PO42.5 cement, II grades of 37~43kg of flyash, S75 ore deposits 51~80kg of ground-slag, 22~26kg of metakaolin, 22~26kg of I type UEA swelling agents, 0.6~1.5kg of polypropylene fibre, slow setting 6.26~8.13kg of type polycarboxylate water-reducer, 163~176kg of water.

The present invention is comprised the following steps for the mixing proportion design method of the metakaolin concrete of ultra-large volume structure：

(1) the volume V of rubble is determined_gWith quality m_g, computational methods are as follows：

m_g=V_g×ρ_g

In formula：V_gThe volume of-rubble, m³；ρ_gThe apparent density of-rubble, kg/m³；ρ_LgThe bulk density of-rubble, kg/m³； S_gThe specific surface area of-rubble, m²/kg；h_mThe screed thickness of-parcel rubble, m；m_gThe quality of-rubble, kg；

(2) the volume V of fine work Machine-made Sand is determined_sWith quality m_s, computational methods are as follows：

m_s=V_s×ρ_s

In formula：V_sThe volume of-fine work Machine-made Sand, m³；ρ_sThe apparent density of-fine work Machine-made Sand, kg/m³；ρ_Ls- fine work mechanism The bulk density of sand, kg/m³；S_sThe specific surface area of-fine work Machine-made Sand, m²/kg；h_pThe paste thickness of-parcel fine work Machine-made Sand, m；m_sThe quality of-fine work Machine-made Sand, kg；

(3) the apparent density ρ of Binder Materials is determined_B, computational methods are as follows：

In formula：ρ_BThe apparent density of-Binder Materials, kg/m³；ρ_CThe apparent density of-cement, kg/m³；ρ_FThe table of-flyash See density, kg/m³；ρ_SThe apparent density of-slag powders, kg/m³；ρ_MThe apparent density of-metakaolin, kg/m³；ρ_E- swelling agent Apparent density, kg/m³；β_C- cement accounts for the mass percent of Binder Materials, %；β_F- flyash accounts for the quality percentage of Binder Materials Number, %；β_S- slag powders account for the mass percent of Binder Materials, %；β_M- metakaolin accounts for the mass percent of Binder Materials, %； β_E- swelling agent accounts for the mass percent of Binder Materials, %；

(4) according to《Design of common concrete proportioning code》The regulation of JGJ 55 determines concrete preparation strength f_{Cu, 0}With The water-cement ratio m of concrete_W/m_B。

(5) the quality m of the Binder Materials of concrete is determined_B, cement quality m_C, flyash quality m_F, slag powders matter Amount m_S, metakaolin quality m_M, swelling agent quality m_E, water quality m_W, slow-setting polycarboxylic acid water reducing agent quality m_ca, meter Calculation method is as follows：

m_C=m_B×β_c

m_F=m_B×β_F

m_S=m_B×β_S

m_M=m_B×β_M

m_E=m_B×β_E

m_W=m_B×(m_W/m_B)

m_ca=m_B×α

In formula：m_W/m_BThe water-cement ratio of-concrete；ρ_WThe apparent density of-water, kg/m³；V_aThe volume of-air, m³, non-bleed Type concrete takes 0.01m³；m_BThe quality of-Binder Materials, kg；m_CThe quality of-cement, kg；m_FThe quality of-flyash, kg；m_S- ore deposit The quality of ground-slag, kg；m_MThe quality of-metakaolin, kg；m_EThe quality of-swelling agent, kg；m_WThe quality of-water, kg；m_ca- retardation setting type The quality of polycarboxylate water-reducer, kg；α-slow-setting polycarboxylic acid water reducing agent accounts for the mass percent of Binder Materials, %.

The specific surface area of rubble of the present invention and the screed thickness of parcel rubble can be carried out according to rubble grade by table 1 Value.

The specific surface area of the rubble of the size fractionated of table 1 and the sand oar thickness degree of parcel rubble

Rubble grade		Wrap up screed thickness (m) of rubble
			5~31.5 continuous gradings	0.45
5~25mm continuous gradings	0.50

The specific surface area of fine work Machine-made Sand of the present invention and the paste thickness of parcel fine work Machine-made Sand can be according to fine work machines The modulus of fineness of sand processed carries out value by table 2.

The specific surface area of the fine work Machine-made Sand of the different fineness modulus of table 2 and the screed thickness of parcel fine work Machine-made Sand

Modulus of fineness		Wrap up layer of slurry thickness (m) of fine work Machine-made Sand
			2.6	5.10
2.7	4.95
			2.8	4.80
2.9	4.65
			3.0	4.50

Metakaolin of the present invention is Al₂O₃Content is more than 35%wt, SiO₂Content is more than 50%wt, Fe₂O₃And TiO₂ High-Fe-Ti low-quality metakaolin of the total content more than 1%wt.The slow-setting polycarboxylic acid water reducing agent is that a kind of water-reducing rate is more than 28%th, the concrete retarding time more than 8h, 2h slump-loss be less than 10mm, the metakaolin for overlength ultra-large volume structure Concrete special function polycarboxylate water-reducer, including following components compounding is formed：Diminishing polycarboxylic acids mother liquor 6%~8% high, 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 defoamer 0.01%~0.02%, water are remaining Amount.The fine work Machine-made Sand is that content of stone powder is not more than 8%, MB values no more than 0.75, the II areas that modulus of fineness is 2.6~3.0 Middle sand.The polypropylene fibre is that elastic modelling quantity is not less than not less than 3.0GPa, tensile strength not less than 300MPa, draw ratio 300th, the monfil of length 12mm, volume is 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 by example 1 below~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 more than 28%, solid content is 15.2%, its each component content and property Energy index is shown in Table 5 and table 6 respectively, and the wherein solid content of polycarboxylic acids mother liquor is 40%；Cement used is Yunnan state-run assets cement east fine horse The cement of PO 42.5 of Co., Ltd's production, density 3.15g/cm³, 3d compression strength 27.0MPa, 28d compression strength 48.5MPa；Flyash used is II grade of flyash of Yunnan Heng Yang Industrial Co., Ltd.s, 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 new build Material Technology Co., Ltd. S75 slag powders, specific surface area 382m²/ kg, density 2.84g/cm³, 7d activity indexs 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 indexs 93.8%, 7d activity index 103.9%, 28d activity indexs 112.4%.The elastic modelling quantity of polypropylene fibre used be 3.7GPa, Tensile strength is 359MPa, draw ratio is the 343, monfil of length 12mm, and volume is 0.6~1.2kg/m³；Expansion used Agent is I type UEA swelling agents, density 2.84g/cm³, 7d limited expansion rates 0.026% in water, 21d limited expansion rates in air- 0.011%；Water used is Kunming running water.

The related performance indicators of rubble used by the 1~example of example 4 of table 3

Numbering	Grade			Crush index (%)	Elongated particles (%)	Clay content (%)
							Example 1	5~31.5mm continuous gradings	1510	2710	10.6	1.4	0.15
Example 2	5~31.5mm continuous gradings	1520	2740	9.5	2.1	0.12
							Example 3	5~31.5mm continuous gradings	1480	2700	11.7	1.8	0.16
Example 4	5~25mm continuous gradings	1540	2730	8.6	2.5	0.20

The related performance indicators of fine work Machine-made Sand used by the 1~example of example 4 of table 4

Numbering	Level is matched somebody with somebody			Modulus of fineness	Crush index (%)	Content of stone powder (%)	MB values
								Example 1	Sand in II areas	1640	2700	2.8	10.9	7.0	0.25
Example 2	Sand in II areas	1620	2710	3.0	14.8	5.7	0.25
								Example 3	Sand in II areas	1620	2720	2.9	9.6	8.0	0.50
Example 4	Sand in II areas	1680	2740	2.6	13.8	6.7	0.50

Slow-setting polycarboxylic acid water reducing agent related component content used by the 1~example of example 4 of table 5

Example 1

For ultra-large volume structure C30 metakaolins concrete by rubble, fine work Machine-made Sand, PO42.5 water Mud, II grade flyash, S75 slag powders, metakaolin, I type UEA swelling agents, polypropylene fibre, retardation setting type polycarboxylic acids Water reducer and water are formed by certain match ratio mixed preparing, and the quality proportioning of folk prescription concrete each component is as follows：It is broken Stone 1025kg, 213kg, II grade of flyash 37kg, S75 slag powders of fine work Machine-made Sand 839kg, PO42.5 cement 74kg, metakaolin 22kg, I type UEA swelling agents 22kg, polypropylene fibre 0.6kg, retardation setting type polycarboxylic acids subtract Aqua 6.26kg, water 176kg.The mix-design of concrete is carried out according to the following steps successively：(1) rubble is determined Volume (V_g) and quality (m_g), m_g=V_g×ρ_g=0.3782 × 2710=1025kg.(2) volume (V of fine work Machine-made Sand is determined_s) and quality (m_s),m_s=V_s×ρ_s=0.3108 × 2700=839kg.(3) Binder Materials apparent density (ρ is determined_B), (4) according to《Common concrete proportioning Design discipline》The regulation of JGJ 55 determines concrete preparation strength (f_{Cu, 0}) and concrete water-cement ratio (m_W/m_B), it is computed f_{Cu, 0}=38.2MPa, m_W/m_B=0.48.(5) quality (m of the Binder Materials of concrete is determined_B), the quality (m of cement_C), fine coal Quality (the m of ash_F), the quality (m of slag powders_S), the quality (m of metakaolin_M), the quality (m of swelling agent_E), the quality (m of water_W)、 Quality (the m of slow-setting polycarboxylic acid water reducing agent_ca), m_C=m_B×β_c=368 × 58%=213kg, m_F=m_B×β_F=368 × 10%=37kg, m_S=m_B×β_S=368 × 20%= 74kg, m_M=m_B×β_M=368 × 6%=22kg, m_E=m_B×β_E=368 × 6%=22kg, m_W=m_B×(m_W/m_B)=368 × 0.48=176kg, m_ca=m_B× α=368 × 1.7%=6.26kg.The concrete mix of embodiment 1 is shown in Table 6, concrete Mix physical performance and mechanical property be shown in Table 7, the volume stability and endurance quality of concrete are shown in Table 8.

Example 2

For ultra-large volume structure C35 metakaolins concrete by rubble, fine work Machine-made Sand, PO42.5 water Mud, II grade flyash, S75 slag powders, metakaolin, I type UEA swelling agents, polypropylene fibre, retardation setting type polycarboxylic acids diminishing 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 1031kg, 233kg, II grade of flyash 40kg, S75 slag powders 80kg of fine work Machine-made Sand 830kg, PO42.5 cement, partially Kaolin 24kg, I type UEA swelling agents 24kg, polypropylene fibre 0.9kg, slow-setting polycarboxylic acid water reducing agent 7.22kg, water 172kg.The mix-design of concrete is carried out according to the following steps successively：(1) volume (V of rubble is determined_g) and quality (m_g),m_g=V_g×ρ_g= 0.3763 × 2740=1031kg.(2) volume (V of fine work Machine-made Sand is determined_s) and quality (m_s),m_s=V_s×ρ_s=0.3061 × 2710=830kg.(3) Binder Materials apparent density (ρ is determined_B), (4) according to《Common concrete proportioning Design discipline》The regulation of JGJ 55 determines concrete preparation strength (f_{Cu, 0}) and concrete water-cement ratio (m_W/m_B), it is computed f_{Cu, 0}=43.2MPa, m_W/m_B=0.43.(5) quality (m of the Binder Materials of concrete is determined_B), the quality (m of cement_C), fine coal Quality (the m of ash_F), the quality (m of slag powders_S), the quality (m of metakaolin_M), the quality (m of swelling agent_E), the quality (m of water_W)、 Quality (the m of slow-setting polycarboxylic acid water reducing agent_ca), m_C=m_B×β_c=401 × 58%=233kg, m_F=m_B×β_F=401 × 10%=40kg, m_S=m_B×β_S=401 × 20%= 80kg, m_M=m_B×β_M=401 × 6%=24kg, m_E=m_B×β_E=401 × 6%=24kg, m_W=m_B×(m_W/m_B)=401 × 0.43=172kg, m_ca=m_B× α=401 × 1.8%=7.22kg.The concrete mix of embodiment 2 is shown in Table 6, concrete Mix physical performance and mechanical property be shown in Table 7, the volume stability and endurance quality of concrete are shown in Table 8.

Example 3

For ultra-large volume structure C40 metakaolins concrete by rubble, fine work Machine-made Sand, PO42.5 water Mud, II grade flyash, S75 slag powders, metakaolin, I type UEA swelling agents, polypropylene fibre, retardation setting type polycarboxylic acids subtract Aqua and water are formed by certain match ratio mixed preparing, and the quality proportioning of folk prescription concrete each component is as follows：Rubble 1016kg, 267kg, II grade of flyash 42kg, S75 slag powders 64kg of fine work Machine-made Sand 825kg, PO42.5 cement, Metakaolin 25kg, I type UEA swelling agents 25kg, polypropylene fibre 0.9kg, slow-setting polycarboxylic acid water reducing agent 7.61kg, Water 168kg.The mix-design of concrete is carried out according to the following steps successively：(1) volume (V of rubble is determined_g) and Quality (m_g),m_g=V_g×ρ_g= 0.3764 × 2700=1016kg.(2) volume (V of fine work Machine-made Sand is determined_s) and quality (m_s),m_s=V_s×ρ_s=0.3034 × 2720=825kg.(3) Binder Materials apparent density (ρ is determined_B), (4) according to《Normal concrete coordinates Compare design discipline》The regulation of JGJ 55 determines concrete preparation strength (f_{Cu, 0}) and concrete water-cement ratio (m_W/m_B), it is computed f_{Cu, 0}=48.2MPa, m_W/m_B=0.40.(5) quality of the Binder Materials of concrete is determined (m_B), the quality (m of cement_C), the quality (m of flyash_F), the quality (m of slag powders_S), the quality of metakaolin (m_M), the quality (m of swelling agent_E), the quality (m of water_W), the quality (mca) of slow-setting polycarboxylic acid water reducing agent, m_F=m_B×β_F=423 × 10%=42kg, m_S=m_B×β_S=423 × 15%=64kg, m_M=m_B×β_M=423 × 6%= 25kg, m_E=m_B×β_E=423 × 6%=25kg, m_W=m_B×(m_W/m_B)=423 × 0.40=168kg, m_ca=m_B× α= 423 × 1.8%=7.61kg.The concrete mix of embodiment 3 is shown in Table 6, and the mix physical performance and mechanical property of concrete are shown in Table 7, the volume stability and endurance quality of concrete are shown in Table 8.

Example 4

For ultra-large volume structure C45 metakaolins concrete by rubble, fine work Machine-made Sand, PO42.5 water Mud, II grade flyash, S75 slag powders, metakaolin, I type UEA swelling agents, polypropylene fibre, retardation setting type polycarboxylic acids subtract Aqua and water are formed by certain match ratio mixed preparing, and the quality proportioning of folk prescription concrete each component is as follows：Rubble 1027kg, 282kg, II grade of flyash 43kg, S75 slag powders 51kg of fine work Machine-made Sand 848kg, PO42.5 cement, Metakaolin 26kg, I type UEA swelling agents 26kg, polypropylene fibre 1.5kg, slow-setting polycarboxylic acid water reducing agent 8.13kg, water 163kg.The mix-design of concrete is carried out according to the following steps successively：(1) volume of rubble is determined (V_g) and quality (m_g),m_g=V_g ×ρ_g=0.3762 × 2730=1027kg.(2) volume (V of fine work Machine-made Sand is determined_s) and quality (m_s),m_s=V_s×ρ_s=0.3094 × 2740=848kg.(3) Binder Materials apparent density (ρ is determined_B), (4) according to《Common concrete proportioning Design discipline》The regulation of JGJ 55 determines concrete preparation strength (f_{Cu, 0}) and concrete water-cement ratio (m_W/m_B), it is computed f_{Cu, 0}=53.2MPa, m_W/m_B=0.38.(5) quality (m of the Binder Materials of concrete is determined_B), the quality (m of cement_C), fine coal Quality (the m of ash_F), the quality (m of slag powders_S), the quality (m of metakaolin_M), the quality (m of swelling agent_E), the quality (m of water_W)、 Quality (the m of slow-setting polycarboxylic acid water reducing agent_ca), m_C=m_B×β_c=428 × 66%=283kg, m_F=m_B×β_F=428 × 10%=43kg, m_S=m_B×β_S=428 × 12%= 51kg, m_M=m_B×β_M=428 × 6%=26kg, m_E=m_B×β_E=412 × 6%=26kg, m_W=m_B×(m_W/m_B)=428 × 0.38=163kg, m_ca=m_B× α=428 × 1.9%=8.13kg.The concrete mix of embodiment 4 is shown in Table 6, concrete Mix physical performance and mechanical property be shown in Table 7, the volume stability and endurance quality of concrete are 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

The C30 for ultra-large volume structure designed using the present invention from table 7 and the data of table 8,1~example of embodiment 4 ~C45 metakaolins concrete mixture characteristic is good, with excellent workability, holds the time less than 15s, initial to collapse Degree reaches more than 220mm, and the 2h slumps reach more than 200mm, and 2h Slump Time losing of Large is not more than 20mm, and the presetting period is more 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 has volume stability and endurance quality higher, 14d limitations in water Expansion rate is more than 0.10%, and 28d limited expansion rates are more than 0.05% in air, and cracking resistance grade is L-III；C30~C35 concrete Seepage-resistant grade reach more than P10, chloride-penetration resistance grade and reach Q-IV；The seepage-resistant grade of C40~C45 concrete reaches More than P12, chloride-penetration resistance grade reach Q-V.It can be seen that, made with durable, height high using method for designing of the invention 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.

Tightly packed, high-Fe-Ti low product of the comprehensive utilization with high volume stability that the present invention passes through concrete each component Position metakaolin and the scientific and reasonable adiabatic temperature rise for reducing overlength ultra-large volume concrete of integrated use " muti-added technology " and Reduce itself aquation to shrink, form with durable, high volume stability high, the metakaolin concrete of high workability.

Claims (8)

1. the metakaolin concrete of ultra-large volume structure is used for, it is characterised 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 agents, polypropylene fibre, retardation setting type Polycarboxylate water-reducer and water mixed preparing are formed, 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 agents, 0.6~1.5kg of polypropylene fibre, retardation setting type polycarboxylic acids 6.26~8.13kg of water reducer, 163~176kg of water.

2. the metakaolin concrete for ultra-large volume structure according to claim 1, it is characterised in that described higher Ridge soil is Al₂O₃Content is more than 35%wt, SiO₂Content is more than 50%wt, Fe₂O₃And TiO₂High-Fe-Ti of the total content more than 1%wt Low-quality metakaolin.

3. the metakaolin concrete for ultra-large volume structure according to claim 1, it is characterised in that the slow setting Type polycarboxylate water-reducer is that a kind of water-reducing rate is less than 10mm more than 28%, concrete retarding time more than 8h, 2h slump-loss Metakaolin concrete special function polycarboxylate water-reducer, is formed by the component compounding of following mass ratio：Diminishing polycarboxylic acids high 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 defoamer 0.01% ~0.02%, balance of water, the wherein solid content of polycarboxylic acids mother liquor are 40%.

4. the metakaolin concrete for ultra-large volume structure according to claim 1, it is characterised in that the fine work Machine-made Sand is that content of stone powder is not more than sand in 8%, MB values no more than 0.75, the II areas that modulus of fineness is 2.6~3.0.

5. the metakaolin concrete for ultra-large volume structure according to claim 1, it is characterised in that described poly- third Alkene fiber is that elastic modelling quantity is not less than 300, length 12mm not less than 3.0GPa, tensile strength not less than 300MPa, draw ratio Monfil, volume is 0.6~1.5kg/m³。

6. the match ratio of the metakaolin concrete for overlength ultra-large volume structure as described in any one of Claims 1 to 5 Method for designing, it is characterised in that comprise the following steps：

(1) the volume V of rubble is determined_gWith quality m_g, computational methods are as follows：

$V_g=\frac{1}{{\mathrm{\ρ}}_g/{\mathrm{\ρ}}_{Lg}+{\mathrm{\ρ}}_{Lg}\×S_g\×h_m}$

m_g=V_g×ρ_g

In formula：V_gThe volume of-rubble, m³；ρ_gThe apparent density of-rubble, kg/m³；ρ_LgThe bulk density of-rubble, kg/m³； S_gThe specific surface area of-rubble, m²/kg；h_mThe screed thickness of-parcel rubble, m；m_gThe quality of-rubble, kg；

(2) the volume V of fine work Machine-made Sand is determined_sWith quality m_s, computational methods are as follows：

$V_s=\frac{1-V_g}{{\mathrm{\ρ}}_s/{\mathrm{\ρ}}_{Ls}+{\mathrm{\ρ}}_{Ls}\×S_s\×h_p}$

m_s=V_s×ρ_s

In formula：V_sThe volume of-fine work Machine-made Sand, m³；ρ_sThe apparent density of-fine work Machine-made Sand, kg/m³；ρ_Ls- fine work Machine-made Sand Bulk density, kg/m³；S_sThe specific surface area of-fine work Machine-made Sand, m²/kg；h_pThe paste thickness of-parcel fine work Machine-made Sand, m；m_sThe quality of-fine work Machine-made Sand, kg；

(3) the apparent density ρ of Binder Materials is determined_B, computational methods are as follows：

${\mathrm{\ρ}}_B=\frac{1}{{\mathrm{\β}}_C/{\mathrm{\ρ}}_C+{\mathrm{\β}}_F/{\mathrm{\ρ}}_F+{\mathrm{\β}}_S/{\mathrm{\ρ}}_S+{\mathrm{\β}}_M/{\mathrm{\ρ}}_M+{\mathrm{\β}}_E/{\mathrm{\ρ}}_E}$

In formula：ρ_BThe apparent density of-Binder Materials, kg/m³；ρ_CThe apparent density of-cement, kg/m³；ρ_F- flyash it is apparent Density, kg/m³；ρ_SThe apparent density of-slag powders, kg/m³；ρ_MThe apparent density of-metakaolin, kg/m³；ρ_E- swelling agent Apparent density, kg/m³；β_C- cement accounts for the mass percent of Binder Materials, %；β_F- flyash accounts for the quality hundred of Binder Materials Fraction, %；β_S- slag powders account for the mass percent of Binder Materials, %；β_M- metakaolin accounts for the quality percentage of Binder Materials Number, %；β_E- swelling agent accounts for the mass percent of Binder Materials, %.

According to《Design of common concrete proportioning code》The regulation of JGJ 55 determines concrete preparation strength f_{Cu, 0}And concrete Water-cement ratio m_W/m_E；

(5) the quality m of the Binder Materials of concrete is determined_B, cement quality m_C, flyash quality m_F, slag powders quality m_S、 The quality m of metakaolin_M, swelling agent quality m_E, water quality m_W, slow-setting polycarboxylic acid water reducing agent quality m_ca, computational methods It is as follows：

$m_B=\frac{1-V_g-V_s-V_a}{1/{\mathrm{\ρ}}_B+(m_W/m_B)/{\mathrm{\ρ}}_W}$

m_C=m_B×β_c

m_F=m_B×β_F

m_S=m_B×β_S

m_M=m_B×β_M

m_E=m_B×β_E

m_W=m_B×(m_W/m_B)

m_ca=m_B×α

In formula：m_W/m_BThe water-cement ratio of-concrete；ρ_WThe apparent density of-water, kg/m³；V_aThe volume of-air, m³, non-bleed Type concrete takes 0.01m³；m_BThe quality of-Binder Materials, kg；m_CThe quality of-cement, kg；m_FThe quality of-flyash, kg； m_SThe quality of-slag powders, kg；m_MThe quality of-metakaolin, kg；m_EThe quality of-swelling agent, kg；m_WThe quality of-water, kg； m_caThe quality of-slow-setting polycarboxylic acid water reducing agent, kg；α-slow-setting polycarboxylic acid water reducing agent accounts for the quality percentage of Binder Materials Number, %.

7. the metakaolin concrete mixing proportion design method for ultra-large volume structure according to claim 6, it is special Levy and be, the specific surface area of the rubble and the screed thickness of parcel rubble can carry out value according to rubble grade, work as rubble When grade is 5~31.5mm continuous gradings, the specific surface area of rubble is 0.45m²/ kg, wrap up rubble screed thickness be 1.25×10^-3m；When rubble grade is 5~25mm continuous gradings, the specific surface area of rubble is 0.50m²/ kg, parcel rubble Screed thickness is 1.15 × 10^-3m。

8. the metakaolin concrete mixing proportion design method for ultra-large volume structure according to claim 6, it is special Levy and be, the fineness of the specific surface area of the fine work Machine-made Sand and the paste thickness of parcel fine work Machine-made Sand according to fine work Machine-made Sand Modulus carries out value, and when the modulus of fineness of fine work Machine-made Sand is 2.6, the specific surface area of fine work Machine-made Sand is 5.10m²/ kg, bag The screed thickness for wrapping up in fine work Machine-made Sand is 4.5 × 10^-5m；When the modulus of fineness of fine work Machine-made Sand is 2.7, fine work Machine-made Sand Specific surface area be 4.95m²/ kg, the screed thickness for wrapping up fine work Machine-made Sand is 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, the screed thickness for wrapping up fine work Machine-made Sand is 4.5 ×10^-5m；When the modulus of fineness 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 thickness of Machine-made Sand is 5.0 × 10^-5m；When the modulus of fineness of fine work Machine-made Sand is 3.0, the ratio table of fine work Machine-made Sand Area is 4.50m²/ kg, the screed thickness for wrapping up fine work Machine-made Sand is 5.0 × 10^-5m。