CN104860613B - 160MPa super-strength concrete with high cracking resistance and high fluidity - Google Patents

160MPa super-strength concrete with high cracking resistance and high fluidity Download PDF

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Publication number
CN104860613B
CN104860613B CN201510315199.1A CN201510315199A CN104860613B CN 104860613 B CN104860613 B CN 104860613B CN 201510315199 A CN201510315199 A CN 201510315199A CN 104860613 B CN104860613 B CN 104860613B
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concrete
less
160mpa
strength
fluidity
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CN201510315199.1A
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CN104860613A (en
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陈建大
吴德龙
朱敏涛
李玲玉
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上海建工材料工程有限公司
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Abstract

The invention relates to 160MPa super-strength concrete with high cracking resistance and high fluidity to meet performance requirements such as premixing production, on-site pumping construction and anti-bounce capability. The concrete comprises the following components by weight (kg/cm<3>): 645-680kg of cement, 280-300kg of mineral powder, 160-190kg of coal ash, 252-283kg of silica ash, 980-1,080kg of natural sand, 238-260kg of steel fiber, 40-48kg of an additive and 160-169kg of mixing water, wherein the additive is a high-performance polycarboxylic water reducer. The slump flow of the concrete is kept within 750mm+/-50mm within 3h, the 56d normal-curing compression strength is above 160MPa, the 56d normal-curing breaking strength is above 25MPa, and the concrete can be produced and prepared in a large scale on the basis of a common concrete mixing technology and can be transported to a construction site within 25km by a mixer truck. According to the 160MPa super-strength concrete, the problems of large-scale automatic production and preparation and remote on-site pumping and pouring construction are solved, and abundant ultrafine natural sand accumulated in the Yangtze River basin can be fully utilized.

Description

A kind of high cracking resistance, the 160mpa ultra high strength concrete of high fluidity
Technical field
The present invention relates to construction material, it is related specifically to a kind of high cracking resistance, high fluidity superelevation strong 160mpa concrete, main It is used for the shellproof xoncrete structure position wearing the particular/special requirements such as top board.
Background technology
Compared with normal concrete, high-strength concrete and steel, 160mpa super high strength concrete is as a kind of new height Technology concrete, the advantages of superhigh intensity, high-durability, its performance is with normal concrete and existing high performance concrete phase Ratio has qualitative leap, the comprcssive strength of superelevation and rupture strength, efficiently solves the high fragility of common high performance concrete, And it is better than steel in terms of economy and environmental protection, there is wide potentiality to be exploited and application prospect, be the master of modern concrete Want one of developing direction.
But, current super high strength concrete such as RPC, there is in practical engineering application following deficiency Part: (1) super high strength concrete is prefabricated into thin plate, whole concrete construction poor performance, viscosity is big, mainly manually vibrates close Real;(2) super high strength concrete or Site and used in certain Reinforcement of Engineering Structure.Further, since not solving Certainly super high strength concrete carries out large-scale production preparation on the basis of existing concrete mixing plant stirring technique, causes superelevation strong There is very big defect in scale application aspect in the concrete of 160mpa and above intensity.This is mainly made by both sides reason Become: one, the raw material of existing superelevation strong 160mpa concrete are all more special, are difficult to carry out on existing mixing plant Scale metering and production;Two, the workability difference of superelevation strong 160mpa concrete requires it is impossible to meet pumping construction.
And because some engineerings have, concrete walls top board is shellproof to wear meter functional requirement, needs strong using premixing superelevation 160mpa concrete carries out site pumping construction, urgently needs a kind of new there is intensity 160mpa and above, scale Produce preparation, the transport of remote trucd mixer, each side such as site pumping construction casting meeting currently and engineering from now on sets Meter functional requirement.
Content of the invention
It is not suitable for existing coagulation it is an object of the invention to overcoming and there is superelevation strong 160mpa concrete in prior art Soil mixing station preparation technology produces concrete it is impossible to long distance transportation, be unable to the difficult problems such as site pumping construction, provides a kind of new There is high cracking resistance, high fluidity superelevation strong 160mpa concrete.The high cracking resistance of the present invention, high fluidity superelevation strong 160mpa coagulation It is special that soil requires it to meet in intensity, prepare with scale performance, remote trucd mixer transport performance and pumping construction aspect of performance The use requirement of engineering, and gather materials on the spot, make full use of the ultra fine sand that waste resource such as modulus of fineness is 1.0 ~ 1.4, generating Flyash of factory etc. is used for preparing superelevation strong 160mpa concrete.
In order to reach foregoing invention purpose, the technical scheme that patent of the present invention provides is as follows:
A kind of high cracking resistance, the 160mpa ultra high strength concrete of high fluidity are it is characterised in that the one-tenth of this concrete is grouped Become and proportioning be as follows:
Composition folk prescription consumption proportion (kg/m3)
Cement 645 ~ 680
Breeze 280 ~ 300
Flyash 160 ~ 190
Silicon ash 252 ~ 283
Natural sand 980 ~ 1080
Steel fibre 238 ~ 260
Additive 40 ~ 48
Mixing water 160 ~ 169;
Above-mentioned additive is polycarboxylate high performance water-reducing agent, and the water-reducing rate of this polycarboxylate high performance water-reducing agent is 35% ~ 40%, is collapsed not less than 3 hours the time to the guarantor of concrete;The modulus of fineness of described natural sand is 1.0 ~ 1.4, and particle diameter is little In 1.16mm, clay content is less than 1.5%, and apparent density is not less than 2600 kg/m3;Described steel fibre is milling type, diameter For 0.25mm ~ 0.3mm, length be 20mm ~ 25mm, density be 7.8 × 103kg /m3;This concrete divergence in 3 hours is protected Hold in 750 mm ± 50mm, 56d standard curing comprcssive strength more than 160mpa, 56d standard curing rupture strength 25mpa and with On, transportation range reaches 25km.
In the high cracking resistance of the present invention, the 160mpa ultra high strength concrete of high fluidity, described breeze grade is s105, Not less than 105%, 28d activity is not less than 110% to fluidity ratio, and specific surface area is not less than 520 m2/kg.
In the high cracking resistance of the present invention, the 160mpa ultra high strength concrete of high fluidity, described cement is strength grade Portland cement for p.ii52.5,28d glue sand comprcssive strength is not less than 60mpa, and 56d glue sand comprcssive strength is not less than 70mpa, The consumptive use of water normal consistence of cement is not more than 26%, tricalcium aluminate c in cement3A mineral constituent content is less than 6.5%, cement Specific surface area is not more than 350m2/kg.
In the high cracking resistance of the present invention, the 160mpa ultra high strength concrete of high fluidity, described flyash is that ii level is high Calcium ash, apparent density is less than 2.35 × 103kg/m3, loss on ignition is not more than 1.0%, and water demand ratio is less than 100%.
In the high cracking resistance of the present invention, the 160mpa ultra high strength concrete of high fluidity, described silicon ash is powder, sio2Content is no less than 95%, and at 0.1 μm~0.3 μm, specific surface area is 20 m to mean diameter2/ g~28m2/g.
In the high cracking resistance of the present invention, the 160mpa ultra high strength concrete of high fluidity, described steel fibre is milling type, A diameter of 0.25mm ~ 0.3mm, length are 20mm ~ 25mm, density 7.8 × 103kg /m3.
Based on technique scheme, the high cracking resistance of the present invention, high fluidity superelevation strong 160mpa concrete should through practice With achieving following technique effect:
1. the high cracking resistance of patent of the present invention, high fluidity 160mpa super high strength concrete are in intensity 160mpa and above, anti- Folding intensity 25mpa and above, concrete divergence are maintained at the multiple performance aspects such as 750 mm ± 50mm and have all reached engineering wall Top board has the shellproof functional requirement worn, and the slump retaining of high cracking resistance, high fluidity superelevation strong 160mpa concrete to reach 3 little When, large-scale production preparation can be carried out on the basis of existing normal concrete stirring technique, and flowing divergence of constructing is maintained at 700 mm ~ 800mm, have the transportation radius scope of remote 25km, can meet carry out job site pumping construction performance will Ask.
2. the high cracking resistance of patent of the present invention, natural sand employs the Yangtze river basin in high fluidity 160mpa super high strength concrete Silt, that is, modulus of fineness be 1.0 ~ 1.4 ultra fine sand, both make use of resource garbage, improve further through technological means super The anti-crack ability of high-strength concrete, solve because of the difficult problem that easily causes concrete cracking using ultra fine sand so that become give up into Treasured becomes feasible, and solves the industrialized production preparation problem of superhigh intensity 160mpa concrete again.
Specific embodiment
We come the high cracking resistance to the present invention, high fluidity superelevation strong 160mpa concrete in conjunction with specific embodiments below Further elaborated, in the hope of providing a clearer understanding of its respective outer side edges and functional characteristics, but can not be limited with this Make its protection domain.
The present invention is a kind of high cracking resistance, high fluidity 160mpa super high strength concrete, and in this concrete, component includes water The natural ultra fine sand of mud, breeze, flyash, silicon ash, steel fibre, additive and mixing water.
One group of most important one-tenth therein is grouped into and proportioning is as follows:
Composition folk prescription consumption proportion (kg/m3)
Cement 645 ~ 680
Breeze 280 ~ 300
Flyash 160 ~ 190
Silicon ash 252 ~ 283
Modulus of fineness is 1.0~1.4 natural sand 980 ~ 1080
Steel fibre 238 ~ 260
Additive 40 ~ 48
Mixing water 160 ~ 169;
This high cracking resistance, high fluidity superelevation strong 160mpa concrete divergence in 3 hours are maintained at 750 mm ± 50mm, 56d standard curing comprcssive strength more than 160mpa, 56d standard curing rupture strength 25mpa and more than.
This high cracking resistance, high fluidity 160mpa super high strength concrete can be on existing normal concrete stirring techniques Meet the large-scale production preparation of super high strength concrete, the job site within 25km is transported by trucd mixer, is used for Live pump truck pumping construction, pour, be mainly used in the shellproof xoncrete structure position wearing the particular/special requirements such as top board, solve superelevation strong The mass automatic production preparation of 160mpa, remote site pumping pouring construction problem.
Above-mentioned natural sand is special thin natural sand, and modulus of fineness is 1.0 ~ 1.4, particle diameter in the range of 0mm ~ 1.16mm, Clay content is less than 1.5%, and apparent density is not less than 2600 kg/m3.Yangtze river basin silt so can be made full use of many and thin Degree modulus, in 1.0 ~ 1.4 special thin natural sands, solves river course silt and piles up the influence to channel to the Yangtze river basin.In addition, by adding The technological means such as steel fibre improve the anti-crack ability of super high strength concrete, solve because easily causing coagulation using ultra fine sand A difficult problem for soil cracking becomes feasible so that turning waste into wealth.
Above-mentioned additive is polycarboxylate high performance water-reducing agent, and its quality meets existing national standards, and " concrete is additional Agent " (gb8076-2008) regulation.In addition, the requirement to additive: the compatibility with cement is good, water-reducing rate big, guarantor moulds.Pin To high cracking resistance, high fluidity superelevation strong 160mpa concrete, should be subtracted using the polycarboxylic acids series high-performance that water-reducing rate is 35% ~ 40% Water preparation, it can provide powerful diminishing, protect the effect of collapsing, and collapse the time not less than 3 hours to the guarantor of concrete, than equal water-reducing rate Polycarboxylate high performance water-reducing agent prepare concrete strength can improve 10%.
It is experimentally confirmed, the model that the Shanghai MBT & SCG High-Tech Construction Chemical Co., Ltd. being adopted produces Master glenium ace 8308(abbreviation ace 8308) polycarboxylate high performance water-reducing agent, as one kind, there is height and subtract Water, the high performance additive of high-thin arch dam, need the control of rigorous concentration concrete flowing divergence in concrete large-scale production process System.
Above-mentioned breeze is ground granulated blast furnace slag, be granulated blast-furnace slag drying, grinding (or add a small amount of Gypsum Fibrosum one Play grinding) reach suitable fineness and meet the powder body of corresponding activity index.Ground granulated blast furnace slag grade therein is s105, stream Not less than 105%, 28d activity is not less than 110% to dynamic degree ratio, and specific surface area is not less than 520 m2/kg.Its quality meets " for water Ground granulated blast furnace slag in mud and concrete " (gb/t18046).The volcano ash effect of pulverized slag powder is high, therefore can change Pore structure after kind concrete hardening and intensity.Again because ore powder granularity is higher, surface energy is high, meeting rapid adsorption is in cement granules Surface, so that the Flocculated Cement structure being originally likely to form cannot be formed, serves the effect of similar water reducer, in water consumption phase With in the case of can significantly improve the flowing velocity of concrete batching system, improve its rheological property, and to improving the morning of concrete Phase pore structure has certain effect, is conducive to the durability of maturing.
Above-mentioned cement is the portland cement of p.ii52.5 for strength grade, and 28d glue sand comprcssive strength is not less than 60mpa, 56d glue sand comprcssive strength is not less than 70mpa, and the consumptive use of water normal consistence of cement is not more than 26%, tricalcium aluminate in cement c3A mineral constituent content is less than 6.5%, and the specific surface area of cement is not more than 350m2/kg.And other quality meet meet existing National standard " common portland cement " (gb175-2007).
Above-mentioned flyash is ii level high calcium ash, and apparent density is less than 2.35 × 103kg/m3, loss on ignition is not more than 1.0%, water demand ratio is less than 100%.Flyash as a kind of industrial waste, through the selecting crude drugs with winnower gained of power plant's waste material.Flyash It is the active admixture of concrete, there is " active effect ", " interfacial effect ", " micro-packing effect " and " diminishing effect ".Mixed It is contemplated that giving full play to above-mentioned effect in solidifying soil, one is that the granule of requirement active admixture should be formed on microcosmic with cement granules Level part system;Two is that spherical glass body content requirement is high, because the diminishing effect containing the high admixture of spherical glass body is notable, needs The water yield can substantially reduce, and need to consider the dual diminishing coupling of water reducer and flyash simultaneously, also help raising superelevation and mix by force The later strength of solidifying soil, is suitable for the shellproof xoncrete structure position wearing the particular/special requirements such as top board.
It is sio in powder in above-mentioned silicon ash2Content is no less than 95%, and mean diameter, at 0.1 μm~0.3 μm, compares table Area is 20 m2/ g~28m2/g.Above-mentioned steel fibre is milling type, a diameter of 0.25mm ~ 0.3mm, length are 20mm ~ 25mm, Density is 7.8 × 103kg /m3Steel fibre, these steel fibres are fed intake by the way of artificial when prepared by concrete.On State the configuration of steel fibre and interpolation enable concrete have shellproof wear and high cracking resistance, can be used for shellproof wear that top board etc. is special will The xoncrete structure position asked.
In order to reach the shellproof functional requirement worn of some special engineering wall top plates, the high cracking resistance of the present invention, high fluidity 160mpa super high strength concrete have in performance indications 56d comprcssive strength more than 160mpa, rupture strength 25mpa with Above, the performance characteristics such as large-scale production preparation, the transport of remote trucd mixer and site pumping construction.Concrete fluidity is maintained at The slump retaining of 750 mm ± 50mm and high cracking resistance, high fluidity superelevation strong 160mpa concrete reaches 3 hours, and concrete stream Dynamic divergence is maintained at 750 mm ± 50mm it is easy to produce preparation in existing concrete stirring technique.The high cracking resistance of the present invention, High fluidity superelevation strong 160mpa concrete in every respect performance all meet the current and its following special engineering shellproof wear, high The performance requirements such as cracking resistance.
The present embodiment is the high cracking resistance of the present invention, high fluidity 160mpa super high strength concrete in the shellproof wall top plate worn of construction Engineer applied during structure position, tests whether it meets scale engineer applied.Following table is as the present embodiment 160mpa superelevation The concrete one-tenth in application for the reinforced concrete is grouped into extremely proportioning:
Title material Water Cement Breeze Flyash Silicon ash Steel fibre Natural sand Additive
Specification Clear water p.ii52.5 s105 C class ii level sio2Content 96% Diameter 0.28mm length 25mm Modulus of fineness is 1.2 ace8308
Folk prescription consumption 165 655 280 170 255 240 990 42
Above-mentioned high cracking resistance, high fluidity 160mpa super high strength concrete are prepared in the following way and answer with industry With:
Placed an order with reference to steel fibre Manual material feeding mode, in 3 side's blenders using existing concrete mixing plant production technology The preparation method of disk stirring 2.5 sides carries out production to be completed, and have passed through and mixes the interior sampling in station performance detection, trucd mixer transports 25 kilometers Building-site to enter the sampling performance detection of pumping hole, the concrete performance going out pumping hole, the concrete performance of entity detection, construction accurate Standby and a series of preparations such as check, after then carrying out the operation such as concrete pumping, pouring construction.
Through experimental test, prepare the high cracking resistance of the present invention, the concrete performance of high fluidity is: the concrete in 3 hours Flowing divergence be maintained at 740 mm ~ 780mm, 28d comprcssive strength be 140mpa, intensity 166mpa, rupture strength 22mpa, 56 Rupture strength is 28mpa, and the high cracking resistance of the present invention, high fluidity superelevation strong 160mpa concrete are in comprcssive strength performance, cracking resistance The everyways such as performance, function of slump protection, whipping performance, pump-conveying property can meet the high cracking resistance of following movie theatre, high fluidity superelevation The performance requirement of the building of strong 160mpa concrete.

Claims (3)

1. the 160mpa ultra high strength concrete of a kind of high cracking resistance, high fluidity is it is characterised in that the one-tenth of this concrete is grouped into And proportioning is as follows:
Composition folk prescription consumption proportion (kg/m3)
Cement 645 ~ 680
Breeze 280 ~ 300
Flyash 160 ~ 190
Silicon ash 252 ~ 283
Natural sand 980 ~ 1080
Steel fibre 238 ~ 260
Additive 40 ~ 48
Mixing water 160 ~ 169;
Above-mentioned additive is polycarboxylate high performance water-reducing agent, the water-reducing rate of this polycarboxylate high performance water-reducing agent is 35% ~ 40%, is collapsed not less than 3 hours the time to the guarantor of concrete;The modulus of fineness of described natural sand is 1.0 ~ 1.4, and particle diameter is not more than 1.16mm, clay content is less than 1.5%, and apparent density is not less than 2600 kg/m3;Described steel fibre is milling type, a diameter of 0.25mm ~ 0.3mm, length are 20mm ~ 25mm, density is 7.8 × 103kg /m3;This concrete divergence in 3 hours keeps In 750 mm ± 50mm, 56d standard curing comprcssive strength more than 160mpa, 56d standard curing rupture strength 25mpa and more than, Transportation range reaches 25km, and described breeze grade is s105, and not less than 105%, 28d activity is not less than 110% to fluidity ratio, compares table Area is not less than 520 m2/ kg, described cement is the portland cement of p.ii52.5 for strength grade, 28d glue sand pressure resistance Degree is not less than 60mpa, and 56d glue sand comprcssive strength is not less than 70mpa, and the consumptive use of water normal consistence of cement is not more than 26%, in cement Tricalcium aluminate c3A mineral constituent content is less than 6.5%, and the specific surface area of cement is not more than 350m2/kg.
2. a kind of high cracking resistance according to claim 1, the 160mpa ultra high strength concrete of high fluidity, its feature exists In described flyash is ii level high calcium ash, and apparent density is less than 2.35 × 103kg/m3, loss on ignition is not more than 1.0%, needs water Amount ratio is less than 100%.
3. a kind of high cracking resistance according to claim 1, the 160mpa ultra high strength concrete of high fluidity, its feature exists In described silicon ash is powder, sio2Content is no less than 95%, and at 0.1 μm~0.3 μm, specific surface area is 20 to mean diameter m2/ g~28m2/g.
CN201510315199.1A 2015-06-10 2015-06-10 160MPa super-strength concrete with high cracking resistance and high fluidity CN104860613B (en)

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CN105272027B (en) * 2015-09-23 2017-07-25 江苏苏博特新材料股份有限公司 A kind of compression strength 300MPa above ultra-high performance concretes and preparation method thereof
CN105272020B (en) * 2015-11-20 2018-01-02 上海建工材料工程有限公司 A kind of heat resistance is 500 DEG C of C40 pump concretes
CN105948660B (en) * 2016-06-14 2019-04-02 同济大学 A kind of high-strength superhigh tenacity concrete and preparation method thereof
CN106186859A (en) * 2016-07-02 2016-12-07 曹平 A kind of preparation of high efficient concrete
CN106542788A (en) * 2016-10-18 2017-03-29 贵州建工混凝土有限责任公司 A kind of Machine-made Sand C120 steel fibre pump concretes and preparation method thereof
CN107117887A (en) * 2017-06-08 2017-09-01 上海百理新材料科技股份有限公司 A kind of method that use Machine-made Sand prepares fiber pump concrete
CN108640593A (en) * 2018-05-28 2018-10-12 上海建工材料工程有限公司 A kind of high tenacity, explosion-proof, ultra high strength concrete

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CN101318801A (en) * 2008-07-09 2008-12-10 东南大学 Cement-base material with good movability and high intensity, and method of manufacturing the same
CN101486554A (en) * 2009-02-20 2009-07-22 武汉理工大学 Low cost active powder concrete and preparation thereof
CN103539407B (en) * 2013-10-18 2015-06-10 西安建筑科技大学 Concrete for steel reinforced concrete combined structure with C160 strength level
CN104230270A (en) * 2014-09-11 2014-12-24 湖南嘉威科技有限公司 Low-viscosity active powder concrete and preparation method thereof

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