CN104478325A - C90-grade self-compaction high-strength concrete and preparation method thereof - Google Patents

C90-grade self-compaction high-strength concrete and preparation method thereof Download PDF

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CN104478325A
CN104478325A CN201410699851.XA CN201410699851A CN104478325A CN 104478325 A CN104478325 A CN 104478325A CN 201410699851 A CN201410699851 A CN 201410699851A CN 104478325 A CN104478325 A CN 104478325A
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concrete
water
reducing agent
sand
compacting
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刘晓
鲍俊涛
王兵
赵柏东
朱江
李欣
麻路
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Shenyang University
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Shenyang University
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Abstract

The invention provides C90-grade self-compaction high-strength concrete and a preparation method thereof, and relates to a building material and a preparation method thereof. The C90-grade self-compaction high-strength concrete is prepared from the following materials in the following proportion: the ratio of cement to silicon ash to fly ash to stones to sand to water to a high-efficiency water reducing agent (unit Kg/m<3>) is (440-480) to (25-55) to (55-110) to (580-700) to (1100-1300) to (115-135) to (16-22). Compared with the prior art, a low-carbon environment-friendly architectural concept is integrated, the strength grade is very high and the working performance is good; and the C90-grade self-compaction high-strength concrete is particularly suitable for novel steel pipe high-strength concrete combined structures with limited inner spaces of steel pipes, such as pouring structural steel pipe concrete, hollow interlayer steel pipe concrete, steel pipe concrete overlapped members and dual steel pipe concrete and the like.

Description

A kind of C90 level self-compacting high-strength concrete and compound method thereof
Technical field
the present invention relates to a kind of material of construction and compound method thereof, particularly relate to a kind of C90 level self-compacting high-strength concrete and compound method thereof.
Background technology
Along with the progress of Building technology, building structure is towards large span, high level is Super High future development even, in concrete filled steel tube, if concrete intensity is too low, when steel are not yet surrendered, concrete is just crushed, the mechanical property of concrete filled steel tube can not be fully played, but be subject to the restriction of many factors, scantlings of the structure can not strengthen along with the increase of structural load, concrete vibrating difficulty is just there is in such construction process, in the novel steel tube high-strength concrete composite structure of particularly steel duct limited space, be easy to make structure produce space because vibrating eakiness, bubble and crack, not only can not play steel and the excellent mechanical property of concrete structure, but also bring greater impact to the security of structure, and a kind of self-compacting high-strength concrete can address these problems well.
Reached the 30%-40% of the total consumption of concrete in the use of the national self-compacting concretes such as America and Europe, the use of self-compacting concrete also becomes an important indicator of a measurement national Building technology.In recent years, the novel building technology developing a kind of low-carbon environment-friendly is being puted forth effort by China, and China is every year because generating produces the flyash of billions of tons, if these flyash not in addition process can cause great impact to environment, the present invention makes full use of this situation, turn waste into wealth, reasonably the Building technology theory of low-carbon environment-friendly is dissolved in the middle of the process for preparation of self-compacting high-strength concrete.
Current China about concrete filled steel tube high-strength concrete used mostly strength grade less than C80, and also exist in construction process vibrate difficulty etc. in a difficult problem, and the day by day rise of the novel steel tube concrete structures such as shaped steel concrete filled steel tube, concrete-filled double skin steel tube, steel tube concrete superposed component and compound concrete filled steel tube, for system assists the accessibility of both steel and concrete relative merits and construction casting, the preparation of C90 level self-compacting high-strength concrete and workability as emphasis, are carried out research emphatically by patent of the present invention.
Therefore by providing " a kind of compound method of C90 level self-compacting high-strength concrete " of system, self-compacting high-strength concrete widely using in building structure can be promoted, not only can promote the progress of Building technology and construction technology, and meet the Building technology theory of low-carbon environment-friendly, there is larger economy, environmental protection and social benefit.
Summary of the invention
The object of the present invention is to provide a kind of C90 level self-compacting high-strength concrete and compound method thereof; the intensity of the self-compacting high-strength concrete of configuration reaches C90 level; the suitable especially novel steel tube high-strength concrete composite structure with building steel duct limited space; the present invention effectively can save preparation cost, and the utilization of flyash simultaneously can have protection of the environment.
The object of the invention is to be achieved through the following technical solutions:
1, a C90 level self-compacting high-strength concrete, this mix proportion is:
Cement: silicon ash: flyash: stone: sand: water: high efficiency water reducing agent: (unit be kilogram every cubic metre): (440-480): (25-55): (55-110): (1100-1300): (580-700): (115-135): (16-22).
2, a kind of compound method of C90 level self-compacting high-strength concrete comprises following step:
(1) preparation of material: according to cement: silicon ash: flyash: stone: sand: water: high efficiency water reducing agent: (unit for kilogram every cubic metre): (440-480): (25-55): (55-110): (1100-1300): (580-700): (115-135): (16-22) prepares starting material.
(2) starting material successively drop in stirrer according to stone, sand, gelling material, water and high efficiency water reducing agent fusion liquid order.
(3) will weigh up stone, the sand of weight, gelling material is poured in stirrer and is stirred 45-60 second, makes the mixed distribution that coarse-fine aggregate and gelling material can be full and uniform.
(4) by high efficiency water reducing agent Homogeneous phase mixing in common tap water, form the fusion liquid of water and high efficiency water reducing agent.
(5) in the process stirred, slowly and evenly poured in stirrer by the fusion liquid of water and high efficiency water reducing agent, make the mixed material mixing of this fusion liquid and stone, sand and gelling material fully, the whipping process time length is 2-3 minute.
(6) water and high efficiency water reducing agent merge after liquid adds and continue stirring 1-2 minute again, then stop stirring, namely define self-compacting high-strength concrete after discharging.
(7) uniform for mix concrete is encased in structure shaping, without the need to vibrating.
The present invention adopts the preparation method of above-mentioned high-quality, ensures the degree of compactness of self-compacting high-strength concrete, workability and high strength, efficiently can prepare C90 level self-compacting high-strength concrete.
According to the proportion of such scheme, water-cement ratio controls at 0.22-0.25; Sand coarse aggregate ratio controls at 0.35-0.4; Silica fume content refers to the proportion that silicon ash accounts for all binder total amounts, controls at 5%-10%; Doping quantity of fly ash refers to that flyash accounts for the proportion of all binder total amounts, controls at 10%-20%.
Such scheme cement is 52.5 grades of ordinary Portland cements.
Such scheme silicon ash is high quality silicon ash.
Such scheme flyash is I grade or II grade of high-quality fly ash.
Such scheme coarse aggregate is the basaltic broken stone with continuous grading, and particle diameter is 5-20 millimeter.
Such scheme fine aggregate is river sand, medium coarse sand, and fineness modulus is 2.7-3.0, and silt content is no more than 2%.
Such scheme high efficiency water reducing agent is the high-efficiency water-reducing agent of poly-carboxylic acid being mixed with pumping agent, and water-reducing rate is 30%-40%, and has certain guarantor and mould function, has good consistency with above-mentioned cement and mineral spike.
Such scheme water is ordinary tap water.
Advantage of the present invention and effect are:
1, compensate for the deficiency of self-compacting high-strength concrete intensity:
The intensity of the self-compacting high-strength concrete that the present invention configures reaches C90 level, as shaped steel concrete filled steel tube, concrete-filled double skin steel tube, steel tube concrete superposed component and compound concrete filled steel tube etc. in the suitable especially novel steel tube high-strength concrete composite structure with building steel duct limited space.
2, cost-saving, low-carbon environment-friendly, has good economic benefit:
Present invention uses coal dust ash and the 5%-10% silicon ash of 10%-20%; and silicon ash and the price of flyash comparatively cement is low; therefore cost of the present invention is lower; effectively can save the cost of preparation C90 level self-compacting concrete; simultaneously the utilization of flyash can effective protection of the environment, meets the facade lighting of low-carbon environment-friendly.
Embodiment
Now be described in detail in conjunction with the compound method of some embodiments to a kind of C90 level self-compacting high-strength concrete.
600 kilograms are no more than according to preparation self-compacting high-strength concrete gelling material; Sand silt content is less than 2%; Stone grating is continuous, and quality is hard, and intensity is higher; The necessary a certain amount of mineral spike of admixture of preparation high-strength concrete; Slump and divergence need requirement that is comparatively large and favorable working performance to carry out the preparation work of C90 level self-compacting high-strength concrete.
The present invention adopts the preparation method of above-mentioned high-quality, ensures the degree of compactness of self-compacting high-strength concrete, workability and high strength, efficiently can prepare C90 level self-compacting high-strength concrete.
The water reducer used in following examples is high-efficiency water-reducing agent of poly-carboxylic acid.
Embodiment 1
Component and the content of C90 level self-compacting high-strength concrete formula 1 are: cement: flyash: silicon ash: stone: sand: water: water reducer: (unit for kilogram every cubic metre) 460:55:38.5:1152:648:125:16.5; In formula, silicon ash used is high quality silicon ash, and flyash is I level high-quality fly ash, and stone is basaltic broken stone, and sand fineness modulus is 2.8, and cement is 52.5 grades of ordinary Portland cements, and water-cement ratio is 0.23.
A kind of compound method of C90 level self-compacting high-strength concrete comprises following step:
(1) preparation of material: according to cement: silicon ash: flyash: stone: sand: water: high efficiency water reducing agent: (unit be kilogram every cubic metre): 460:55:38.5:1152:648:125:16.5 prepares starting material.
(2) starting material successively drop in stirrer according to stone, sand, gelling material, water and high efficiency water reducing agent fusion liquid order.
(3) will weigh up stone, the sand of weight, gelling material is poured in stirrer and is stirred 50 seconds, makes the mixed distribution that coarse-fine aggregate and gelling material can be full and uniform.
(4) by high efficiency water reducing agent Homogeneous phase mixing in common tap water, form the fusion liquid of water and high efficiency water reducing agent.
(5) in the process stirred, slowly and evenly poured in stirrer by the fusion liquid of water and high efficiency water reducing agent, make the mixed material mixing of this fusion liquid and stone, sand and gelling material fully, the whipping process time length is 3 minutes.
(6) water and high efficiency water reducing agent merge after liquid adds and continue stirring again 90 seconds, then stop stirring, namely define self-compacting high-strength concrete after discharging.
(7) uniform for mix concrete is encased in structure shaping, without the need to vibrating.
Have also been devised one group of comparative formula 2 in addition, component and the content of formula 2 are: cement: flyash: silicon ash: stone: sand: water: water reducer: (unit for kilogram every cubic metre) 460:55:38.5:1152:648:120:16.5, water-cement ratio is 0.22, material therefor is consistent with formula 1 with preparation method, repeats no more.
Above-mentioned formula 1 slump and divergence are respectively 235 millimeters and 563 millimeters, and self-compacting high-strength concrete 28 days ultimate compression strength is 92.2 MPas.2 slump of filling a prescription and divergence are respectively 220 millimeters and 531 millimeters, and self-compacting high-strength concrete 28 days ultimate compression strength is 96.1 MPas.
In above-mentioned formula 1 and formula 2, the measurement of slump and divergence is after 30s mentioned by slump cylinder and carries out immediately measuring the value obtained.From formula 1,2 and its essential characteristic, slump is all more than 200 millimeters, divergence is all more than 500 millimeters, when water consumption reduces, water-cement ratio diminishes, but all can meet the good requirement of For Workability of Self-compacting Concrete, and intensity all reaches more than 90 MPas, meet the requirement of C90 level self-compacting high-strength concrete, must prepare under the condition of lower water-cement ratio for preparation high-strength concrete.
Embodiment 2
Component and the content of C90 level self-compacting high-strength concrete formula 3 are: cement: flyash: silicon ash: stone: sand: water: water reducer: (unit for kilogram every cubic metre) 500:50:0:1152:648:120:17.6; In formula, silicon ash used is high quality silicon ash, and flyash is I level high-quality fly ash, and stone is basaltic broken stone, and sand fineness modulus is 2.8, and cement is 52.5 grades of ordinary Portland cements, and water-cement ratio is 0.22.
A kind of compound method of C90 level self-compacting high-strength concrete comprises following step:
(1) preparation of material: according to cement: silicon ash: flyash: stone: sand: water: high efficiency water reducing agent: (unit be kilogram every cubic metre): 500:50:0:1152:648:120:17.6 prepares starting material.
(2) starting material successively drop in stirrer according to stone, sand, gelling material, water and high efficiency water reducing agent fusion liquid order.
(3) will weigh up stone, the sand of weight, gelling material is poured in stirrer and is stirred 60 seconds, makes the mixed distribution that coarse-fine aggregate and gelling material can be full and uniform.
(4) by high efficiency water reducing agent Homogeneous phase mixing in common tap water, form the fusion liquid of water and high efficiency water reducing agent.
(5) in the process stirred, slowly and evenly poured in stirrer by the fusion liquid of water and high efficiency water reducing agent, make the mixed material mixing of this fusion liquid and stone, sand and gelling material fully, the whipping process time length is 3 minutes.
(6) water and high efficiency water reducing agent merge after liquid adds and continue stirring again 100 seconds, then stop stirring, namely define self-compacting high-strength concrete after discharging.
(7) uniform for mix concrete is encased in structure shaping, without the need to vibrating.
Have also been devised one group of comparative formula 4 in addition, component and the content of formula 4 are: cement: flyash: silicon ash: stone: sand: water: water reducer: (unit for kilogram every cubic metre) 460:50:40:1152:648:120:17.6, water-cement ratio is 0.22, material therefor is consistent with formula 3 with preparation method, repeats no more.
In above-mentioned formula 3 and formula 4, the measurement of slump and divergence is after 30s mentioned by slump cylinder and carries out immediately measuring the value obtained.Above-mentioned formula 3 slump and divergence are respectively 252 millimeters and 585 millimeters, and concrete 28 days ultimate compression strength is 90.7 MPas, and 4 slump of filling a prescription and divergence are respectively 233 millimeters and 554 millimeters, and concrete 28 days ultimate compression strength is 95.3 MPas.
From above-mentioned formula 3 and formula 4 and their essential characteristic known do not mix the self-compacting high-strength concrete of silicon ash slump and divergence be all better than mixing the self-compacting high-strength concrete of silicon ash, but the ultimate compression strength of not mixing the self-compacting high-strength concrete of silicon ash will lower than the concrete mixing silicon ash, this is because the specific surface area of silicon ash is greater than the specific surface area of cement, after mixing silicon ash, the water consumption of self-compacting concrete can increase, in order to ensure the intensity of self-compacting high-strength concrete, when water-cement ratio is constant, workability will be affected, concrete will become comparatively thickness, but still the requirement of For Workability of Self-compacting Concrete can be met, mix the slight void that silicon ash can fill self-compacting concrete inside, concrete degree of compactness is improved, thus improves the intensity of self-compacting concrete.From the result of proportioning two, the workability of all self-compacting concretes is all fine, also the intensity of expection is reached, but in order to higher intensity can be obtained, improve fraction, make self-compacting concrete can reach C90 level, be necessary to mix a certain amount of silicon ash, incorporation is that 5%-10% is the most suitable.
Embodiment 3
Component and the content of C90 level self-compacting high-strength concrete formula 5 are: cement: flyash: silicon ash: stone: sand: water: water reducer: (unit for kilogram every cubic metre) 510:0:40:1200:600:120:17.6; In formula, silicon ash used is high quality silicon ash, and flyash is I level high-quality fly ash, and stone is basaltic broken stone, and sand fineness modulus is 2.8, and cement is 52.5 grades of ordinary Portland cements, and water-cement ratio is 0.22.
A kind of compound method of C90 level self-compacting high-strength concrete comprises following step:
(1) preparation of material: according to cement: silicon ash: flyash: stone: sand: water: high efficiency water reducing agent: (unit be kilogram every cubic metre): 510:0:40:1200:600:120:17.6 prepares starting material.
(2) starting material successively drop in stirrer according to stone, sand, gelling material, water and high efficiency water reducing agent fusion liquid order.
(3) will weigh up stone, the sand of weight, gelling material is poured in stirrer and is stirred 55 seconds, makes the mixed distribution that coarse-fine aggregate and gelling material can be full and uniform.
(4) by high efficiency water reducing agent Homogeneous phase mixing in common tap water, form the fusion liquid of water and high efficiency water reducing agent.
(5) in the process stirred, slowly and evenly poured in stirrer by the fusion liquid of water and high efficiency water reducing agent, make the mixed material mixing of this fusion liquid and stone, sand and gelling material fully, the whipping process time length is 3 minutes.
(6) water and high efficiency water reducing agent merge after liquid adds and continue stirring again 80 seconds, then stop stirring, namely define self-compacting high-strength concrete after discharging.
(7) uniform for mix concrete is encased in structure shaping, without the need to vibrating.
Have also been devised one group of comparative formula 6 in addition, component and the content of formula 6 are: cement: flyash: silicon ash: stone: sand: water: water reducer: (unit for kilogram every cubic metre) 460:50:40:1200:600:120:17.6, water-cement ratio is 0.22, material therefor is consistent with formula 5 with preparation method, repeats no more.
In above-mentioned formula 5 and formula 6, the measurement of slump and divergence is after 30s mentioned by slump cylinder and carries out immediately measuring the value obtained.Above-mentioned formula 5 slump and divergence are respectively 220 millimeters and 538 millimeters, and concrete 28 days ultimate compression strength is 94.7 MPas, and 6 slump of filling a prescription and divergence are respectively 247 millimeters and 575 millimeters, and concrete 28 days ultimate compression strength is 91.5 MPas.
From above-mentioned formula 5 and formula 6, data are found out, no matter whether flyash mixes, self-compacting high-strength concrete can both reach the C90 level of expection, from serviceability, no matter the self-compacting concrete being mixed with flyash is that slump or divergence are all better than the self-compacting concrete not mixing flyash; Mix flyash and effectively can reduce water consumption and the serviceability improving self-compacting high-strength concrete, and the concrete being mixed with flyash 28 days time intensity a little less than the concrete not having fly ash, this is because mixing of flyash makes the early strength of self-compacting high-strength concrete decrease; But the concrete later strength of mixing flyash has larger raising, this is the favourable condition not available for concrete not having fly ash.And the self-compacting concrete mixing flyash is under the prerequisite of same workability, can effectively reduce cost, low-carbon environment-friendly.
It should be noted that the above is all embodiments preferred for this invention; the technician of the industry should understand these embodiments and be not limited to the present invention, can change, optimizes and be equal to replacement etc. all should fall within protection scope of the present invention within the category not departing from the present invention's spirit and content to it.

Claims (4)

1. a C90 level self-compacting high-strength concrete, it is characterized in that, to be the proportioning of kilogram every cubic metre be in described concrete unit: cement: silicon ash: flyash: stone: sand: water: high efficiency water reducing agent: (440-480): (25-55): (55-110): (1100-1300): (580-700): (115-135): (16-22).
2. a kind of C90 level self-compacting high-strength concrete according to claim 1, it is characterized in that, the described proportion according to such scheme, water-cement ratio controls at 0.22-0.25; Sand coarse aggregate ratio controls at 0.35-0.4; Silica fume content refers to the proportion that silicon ash accounts for all binder total amounts, controls at 5%-10%; Doping quantity of fly ash refers to that flyash accounts for the proportion of all binder total amounts, controls at 10%-20%.
3. a kind of C90 level self-compacting high-strength concrete according to claim 1, is characterized in that, described cement is 52.5 grades of ordinary Portland cements; Silicon ash is high quality silicon ash; Flyash is I grade or II grade of high-quality fly ash; Coarse aggregate is the basaltic broken stone with continuous grading, and particle diameter is 5-20 millimeter; Fine aggregate is river sand, medium coarse sand, and fineness modulus is 2.7-3.0, and silt content is no more than 2%; High efficiency water reducing agent is the high-efficiency water-reducing agent of poly-carboxylic acid being mixed with pumping agent; Water is ordinary tap water.
4. the compound method of a C90 level self-compacting high-strength concrete, it is characterized in that, described method comprises following step: the preparation of (1) material: according to cement: silicon ash: flyash: stone: sand: water: high efficiency water reducing agent: (unit for kilogram every cubic metre): (440-480): (25-55): (55-110): (1100-1300): (580-700): (115-135): (16-22) prepares starting material;
(2) starting material successively drop in stirrer according to stone, sand, gelling material, water and high efficiency water reducing agent fusion liquid order;
(3) will weigh up stone, the sand of weight, gelling material is poured in stirrer and is stirred 45-60 second, makes the mixed distribution that coarse-fine aggregate and gelling material can be full and uniform;
(4) by high efficiency water reducing agent Homogeneous phase mixing in common tap water, form the fusion liquid of water and high efficiency water reducing agent;
(5) in the process stirred, slowly and evenly poured in stirrer by the fusion liquid of water and high efficiency water reducing agent, make the mixed material mixing of this fusion liquid and stone, sand and gelling material fully, the whipping process time length is 2-3 minute;
(6) water and high efficiency water reducing agent merge after liquid adds and continue stirring 1-2 minute again, then stop stirring, namely define self-compacting high-strength concrete after discharging;
(7) uniform for mix concrete is encased in structure shaping.
CN201410699851.XA 2014-11-28 2014-11-28 C90-grade self-compaction high-strength concrete and preparation method thereof Pending CN104478325A (en)

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CN105174835A (en) * 2015-08-24 2015-12-23 安徽砼宇特构科技有限公司 Anti-compression pipe culvert and preparation method thereof
CN105224727A (en) * 2015-09-11 2016-01-06 郑州大学 A kind of autodensing concrete almixture mixing proportion design method
CN105819779A (en) * 2016-03-23 2016-08-03 沈阳大学 Grade-C60 high-strength recycled concrete and preparation method thereof
CN106012790A (en) * 2016-05-20 2016-10-12 中国路桥工程有限责任公司 Manufacturing method for porous volcanic aggregate concrete T-shaped beam
CN106396562A (en) * 2016-10-13 2017-02-15 沈阳建筑大学 C50 concrete containing water granulated slag fully replacing sand and applied to steel pipe concrete structure
CN106946520A (en) * 2017-03-06 2017-07-14 武汉大学 A kind of ultra-high performance concrete of the coarse aggregate containing basalt and preparation method thereof
CN107324713A (en) * 2017-05-06 2017-11-07 武汉理工大学 A kind of self-compaction concrete filled steel tube and preparation method thereof
CN107721319A (en) * 2017-11-17 2018-02-23 天津海得润滋建材有限公司 Strong concrete mix
CN109020336A (en) * 2018-09-13 2018-12-18 中建西部建设新疆有限公司 A kind of C70 self-compacting concrete and preparation method thereof
CN109053097A (en) * 2018-10-30 2018-12-21 北京建工国际投资有限责任公司 A kind of High Strength Pump Concrete and preparation method thereof
CN109678429A (en) * 2019-01-31 2019-04-26 青岛市地铁一号线有限公司 A kind of preparation method of the no muscle steel fiber reinforced concrete segment in the tunnel TBM
CN110482925A (en) * 2019-09-25 2019-11-22 成都精准混凝土有限公司 A kind of high-strength concrete and its preparation process
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CN105174835A (en) * 2015-08-24 2015-12-23 安徽砼宇特构科技有限公司 Anti-compression pipe culvert and preparation method thereof
CN105224727A (en) * 2015-09-11 2016-01-06 郑州大学 A kind of autodensing concrete almixture mixing proportion design method
CN105819779A (en) * 2016-03-23 2016-08-03 沈阳大学 Grade-C60 high-strength recycled concrete and preparation method thereof
CN106012790A (en) * 2016-05-20 2016-10-12 中国路桥工程有限责任公司 Manufacturing method for porous volcanic aggregate concrete T-shaped beam
CN106396562A (en) * 2016-10-13 2017-02-15 沈阳建筑大学 C50 concrete containing water granulated slag fully replacing sand and applied to steel pipe concrete structure
CN106946520A (en) * 2017-03-06 2017-07-14 武汉大学 A kind of ultra-high performance concrete of the coarse aggregate containing basalt and preparation method thereof
CN107324713B (en) * 2017-05-06 2019-11-26 武汉理工大学 A kind of self-compaction concrete filled steel tube and preparation method thereof
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CN107721319A (en) * 2017-11-17 2018-02-23 天津海得润滋建材有限公司 Strong concrete mix
CN109020336A (en) * 2018-09-13 2018-12-18 中建西部建设新疆有限公司 A kind of C70 self-compacting concrete and preparation method thereof
CN109053097A (en) * 2018-10-30 2018-12-21 北京建工国际投资有限责任公司 A kind of High Strength Pump Concrete and preparation method thereof
CN109678429A (en) * 2019-01-31 2019-04-26 青岛市地铁一号线有限公司 A kind of preparation method of the no muscle steel fiber reinforced concrete segment in the tunnel TBM
CN110482925A (en) * 2019-09-25 2019-11-22 成都精准混凝土有限公司 A kind of high-strength concrete and its preparation process
CN112047699A (en) * 2020-09-21 2020-12-08 中南大学 Large-slump ultrahigh-strength high-performance concrete and preparation method thereof

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