CN104860613A - 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 PDFInfo
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- CN104860613A CN104860613A CN201510315199.1A CN201510315199A CN104860613A CN 104860613 A CN104860613 A CN 104860613A CN 201510315199 A CN201510315199 A CN 201510315199A CN 104860613 A CN104860613 A CN 104860613A
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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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
Technical field
The present invention relates to material of construction, be related specifically to a kind of high cracking resistance, the strong 160MPa concrete of high workability superelevation, be mainly used in shellproof concrete structure position of wearing the particular requirements such as top board.
Background technology
Compare with steel with normal concrete, high-strength concrete, 160MPa super high strength concrete is as a kind of novel High Technique Concrete, in the advantage such as superstrength, high-durability, its performance has compared qualitative leap with normal concrete with existing high performance concrete, the ultimate compression strength of superelevation and folding strength, efficiently solve the high fragility of common high performance concrete, and in economy and environmental protection, be better than steel, having wide potentiality to be exploited and application prospect, is one of main development direction of modern concrete.
But current super high strength concrete, as RPC, has following weak point in practical engineering application: (1) super high strength concrete is prefabricated into thin plate, whole concrete construction poor performance, viscosity is large, main by artificial vibration compacting; (2) super high strength concrete or Site and use at certain Reinforcement of Engineering Structure.In addition, owing to not solving the basis enterprising professional etiquette modelling manufacture of super high strength concrete at existing concrete stirring station stirring technique, the concrete of the strong 160MPa of superelevation and above intensity is caused to there is very large defect in mass-producing application aspect.This reason primarily of two aspects causes: one, the concrete starting material of the strong 160MPa of existing superelevation are all comparatively special, existing stirring station are difficult to carry out mass-producing metering and production; Two, the concrete workability of the strong 160MPa of superelevation is poor, can not meet pumping construction requirement.
And there is the shellproof meter functional requirement that wears of concrete walls top board due to some engineering; need to use premixing superelevation strong 160MPa concrete to carry out site pumping construction, need a kind ofly novel there is intensity 160MPa and each side such as above, large-scale production preparation, remote transport mixer transport, site pumping construction casting to meet engineering design functional requirement current and from now on urgently.
Summary of the invention
The object of the invention is to overcome in prior art and there is the strong 160MPa concrete of superelevation and be not suitable for existing concrete stirring station preparation technology and produce concrete, can not long distance transportation, can not the difficult problem such as site pumping construction, provide a kind of and novel there is high cracking resistance, the strong 160MPa concrete of high workability superelevation.The strong 160MPa concrete of high cracking resistance of the present invention, high workability superelevation requires that it meets the service requirements of special engineering at intensity, mass-producing processability, remote transport mixer transport performance and pumping construction aspect of performance; and gather materials on the spot, making full use of waste resource such as fineness modulus is that the ultra fine sand of 1.0 ~ 1.4, the flyash in power station etc. are for preparing the strong 160MPa concrete of superelevation.
In order to reach foregoing invention object, the technical scheme that patent of the present invention provides is as follows:
A 160MPa ultra high strength concrete for high cracking resistance, high workability, is characterized in that, this concrete one-tenth be grouped into and proportioning as follows:
Composition folk prescription consumption proportion (kg/m
3)
Cement 645 ~ 680
Breeze 280 ~ 300
Flyash 160 ~ 190
Silicon ash 252 ~ 283
Natural sand 980 ~ 1080
Steel fiber 238 ~ 260
Admixture 40 ~ 48
Mixing water 160 ~ 169;
Above-mentioned admixture is polycarboxylate high performance water-reducing agent, and the water-reducing rate of this polycarboxylate high performance water-reducing agent is 35% ~ 40%, is not less than 3 hours the time of collapsing to concrete guarantor; The fineness modulus of described natural sand is 1.0 ~ 1.4, and particle diameter is not more than 1.16mm, and silt content is no more than 1.5%, and apparent density is not less than 2600 kg/m
3; Described steel fiber is milling type, diameter is 0.25mm ~ 0.3mm, length is 20mm ~ 25mm, density is 7.8 × 10
3kg/m
3; This concrete divergence in 3 hours remains on 750 mm ± 50mm, 56d normal curing ultimate compression strength more than 160MPa, 56d normal curing folding strength 25MPa and more than, shipment distance reaches 25km.
In the 160MPa ultra high strength concrete of high cracking resistance of the present invention, high workability, described breeze grade is S105, and degree of mobilization ratio is not less than 105%, 28d activity and is not less than 110%, and specific surface area is not less than 520 m
2/ kg.
In the 160MPa ultra high strength concrete of high cracking resistance of the present invention, high workability, the silicate cement of described cement to be strength grade be P.II52.5,28d glue sand ultimate compression strength is not less than 60MPa, 56d glue sand ultimate compression strength is not less than 70MPa, the consumptive use of water normal consistence of cement is not more than 26%, tricalcium aluminate C in cement
3a mineral constituent content is no more than 6.5%, and the specific surface area of cement is not more than 350m
2/ kg.
In the 160MPa ultra high strength concrete of high cracking resistance of the present invention, high workability, described flyash is II level high calcium ash, and apparent density is no more than 2.35 × 10
3kg/m
3, loss on ignition is not more than 1.0%, and water demand ratio is no more than 100%.
In the 160MPa ultra high strength concrete of high cracking resistance of the present invention, high workability, described silicon ash is Powdered, SiO
2content is no less than 95%, and median size is at 0.1 μm ~ 0.3 μm, and specific surface area is 20 m
2/ g ~ 28m
2/ g.
In the 160MPa ultra high strength concrete of high cracking resistance of the present invention, high workability, described steel fiber is milling type, diameter is 0.25mm ~ 0.3mm, length is 20mm ~ 25mm, density 7.8 × 10
3kg/m
3.
Based on technique scheme, high cracking resistance of the present invention, high workability superelevation strong 160MPa concrete achieve following technique effect through practical application:
1. the high cracking resistance of patent of the present invention, high workability 160MPa super high strength concrete intensity 160MPa and more than, folding strength 25MPa and more than, concrete divergence remains on the multiple aspect of performances such as 750 mm ± 50mm and all reaches engineering wall top plate and have shellproof functional requirement of wearing, and high cracking resistance, the concrete slump retaining of the strong 160MPa of high workability superelevation reaches 3 hours, can at the enterprising professional etiquette modelling manufacture in existing normal concrete stirring technique basis, and construction flowing divergence remains on 700 mm ~ 800mm, there is the transportation radius scope of remote 25km, the performance requriements carrying out working-yard pumping construction can be met.
2. in the high cracking resistance of patent of the present invention, high workability 160MPa super high strength concrete, natural sand have employed the silt of the Yangtze valley, namely fineness modulus is the ultra fine sand of 1.0 ~ 1.4, both make use of resource waste, the crack resistance of super high strength concrete is improve again by technique means, solve the difficult problem easily causing concrete cracking because using ultra fine sand, making to turn waste into wealth becomes feasible, and solves again the concrete suitability for industrialized production of superstrength 160MPa and prepare problem.
Embodiment
We come to do further elaborate high cracking resistance of the present invention, the strong 160MPa concrete of high workability superelevation in conjunction with specific embodiments below; understand its respective outer side edges and functional characteristics in the hope of more cheer and bright, but its protection domain can not be limited with this.
The present invention is a kind of high cracking resistance, high workability 160MPa super high strength concrete, and in this concrete, component includes cement, breeze, flyash, silicon ash, the natural ultra fine sand of steel fiber, admixture and mixing water.
One group of most important one-tenth be wherein grouped into and proportioning as follows:
Composition folk prescription consumption proportion (kg/m
3)
Cement 645 ~ 680
Breeze 280 ~ 300
Flyash 160 ~ 190
Silicon ash 252 ~ 283
Fineness modulus is the natural sand 980 ~ 1080 of 1.0 ~ 1.4
Steel fiber 238 ~ 260
Admixture 40 ~ 48
Mixing water 160 ~ 169;
The strong 160MPa concrete of this high cracking resistance, high workability superelevation divergence in 3 hours remains on 750 mm ± 50mm, 56d normal curing ultimate compression strength more than 160MPa, 56d normal curing folding strength 25MPa and more than.
This high cracking resistance, high workability 160MPa super high strength concrete can meet the large-scale production preparation of super high strength concrete on existing normal concrete stirring technique; the working-yard within distance 25km is transported to by transport mixer; for on-the-spot pump truck pumping construction, build; be mainly used in shellproof concrete structure position of wearing the particular requirements such as top board, solve the mass automatic production preparation of the strong 160MPa of superelevation, remote site pumping pouring construction problem.
Above-mentioned natural sand is special thin natural sand, and fineness modulus is 1.0 ~ 1.4, and particle diameter is within the scope of 0mm ~ 1.16mm, and silt content is no more than 1.5%, and apparent density is not less than 2600 kg/m
3.Many and the fineness modulus of Yangtze valley silt can be made full use of like this at 1.0 ~ 1.4 special thin natural sands, solve river course silt and pile up influence to channel to the Yangtze valley.In addition, improve the crack resistance of super high strength concrete by adding the technique means such as steel fiber, solve the difficult problem easily causing concrete cracking because using ultra fine sand, making to turn waste into wealth becomes feasible.
Above-mentioned admixture is polycarboxylate high performance water-reducing agent, and its quality meets the regulation of existing national standards " concrete admixture " (GB8076-2008).In addition, to the requirement of admixture:, water-reducing rate good with the consistency of cement be large, protect and mould.For high cracking resistance, the strong 160MPa concrete of high workability superelevation, should adopt water-reducing rate be 35% ~ 40% poly carboxylic acid series high-performance water reducing agent, it can provide powerful diminishing, protect the effect of collapsing, be not less than 3 hours the time of collapsing to concrete guarantor, the concrete strength prepared than the polycarboxylate high performance water-reducing agent of equal water-reducing rate can improve 10%.
Prove by experiment, the model that Shanghai MBT & SCG High-Tech Construction Chemical Co., Ltd. of adopting produces is that Master Glenium ACE 8308(is called for short ACE 8308) polycarboxylate high performance water-reducing agent, as a kind of high performance additive with high diminishing, high-thin arch dam, need the control of rigorous concentration concrete flowing divergence in concrete large-scale production process.
Above-mentioned breeze and GBFS are granulated blast-furnace slag dryings, grinding (or adding a small amount of gypsum grinding together) reaches suitable fineness and meets the powder of corresponding activity index.GBFS grade is wherein S105, and degree of mobilization ratio is not less than 105%, 28d activity and is not less than 110%, and specific surface area is not less than 520 m
2/ kg.Its quality meets " GBFS in cement and concrete " (GB/T18046).The volcano ash effect of pulverized slag powder is high, therefore can improve the pore structure after concrete hardening and intensity.Again because ore powder granularity is higher, surface energy is high, meeting rapid adsorption is at cement particle surface, the Flocculated Cement structure that originally may be formed cannot be formed, serve the effect of similar water reducer, the velocity of flow of concrete batching system can be significantly improved when water consumption is identical, improve its rheological property, and have certain effect to the concrete early stage pore structure of improvement, be conducive to the weather resistance of maturing.
The silicate cement of above-mentioned cement to be strength grade be P.II52.5,28d glue sand ultimate compression strength is not less than 60MPa, and 56d glue sand ultimate compression strength is not less than 70MPa, and the consumptive use of water normal consistence of cement is not more than 26%, tricalcium aluminate C in cement
3a mineral constituent content is no more than 6.5%, and the specific surface area of cement is not more than 350m
2/ kg.And other quality meet and meet existing national standard " general purpose portland cement " (GB175-2007).
Above-mentioned flyash is II level high calcium ash, and apparent density is no more than 2.35 × 10
3kg/m
3, loss on ignition is not more than 1.0%, and water demand ratio is no more than 100%.Flyash as a kind of industrial waste, through the selection by winnowing gained of power plant's waste material.Flyash is concrete active admixture, has " active effect ", " interfacial effect ", " micro-packing effect " and " diminishing effect ".In concrete, anticipation gives full play to above-mentioned effect, and one is that the particle of requirement active admixture and cement granules should form grating system on microcosmic; Two is that spherical glass body content requirement is high, because remarkable containing the diminishing effect of the adulterant of spherical glass height, water requirement can reduce greatly, need the dual diminishing coupling considering water reducer and flyash simultaneously, also help the later strength improving super high strength concrete, be suitable for shellproof concrete structure position of wearing the particular requirements such as top board.
In above-mentioned silicon ash is Powdered, SiO
2content is no less than 95%, and median size is at 0.1 μm ~ 0.3 μm, and specific surface area is 20 m
2/ g ~ 28m
2/ g.Above-mentioned steel fiber is milling type, diameter is 0.25mm ~ 0.3mm, length is 20mm ~ 25mm, density is 7.8 × 10
3kg/m
3steel fiber, these steel fibers adopt artificial mode to feed intake when prepared by concrete.The configuration of above-mentioned steel fiber and interpolation make concrete have shellproof wearing and high cracking resistance energy, can be used for shellproof concrete structure position of wearing the particular requirements such as top board.
In order to reach the shellproof functional requirement of wearing of some special engineering wall top plate, high cracking resistance of the present invention, high workability 160MPa super high strength concrete have 56d ultimate compression strength at more than 160MPa, folding strength in performance characteristics such as more than 25MPa, large-scale production preparation, remote transport mixer transport and site pumping constructions in performance index.Concrete degree of mobilization remains on 750 mm ± 50mm and high cracking resistance, the concrete slump retaining of the strong 160MPa of high workability superelevation reach 3 hours, and concrete flowing divergence remains on 750 mm ± 50mm, is easy to manufacture in existing concrete stirring technique.High cracking resistance of the present invention, high workability superelevation strong 160MPa concrete in every respect performance all meet the current and following special engineering shellproofly to wear, the performance requriements such as high cracking resistance.
The present embodiment is high cracking resistance of the present invention, the engineer applied of high workability 160MPa super high strength concrete when building the shellproof wall top plate structure position worn, and tests it and whether meets mass-producing engineer applied.Following table is grouped into extremely proportioning as the concrete one-tenth of the present embodiment 160MPa super high strength concrete when applying:
| Title material | Water | Cement | Breeze | Flyash | Silicon ash | Steel fiber | Natural sand | Admixture |
| Specification | Clear water | P.II52.5 | S105 | C class II level | SiO 2Content 96% | Diameter 0.28mm length 25mm | Fineness modulus is 1.2 | ACE8308 |
| Folk prescription consumption | 165 | 655 | 280 | 170 | 255 | 240 | 990 | 42 |
Above-mentioned high cracking resistance, high workability 160MPa super high strength concrete are prepared in the following way to be applied with industry:
Existing concrete mixing plant production technique is utilized to carry out production complete in conjunction with steel fiber Manual material feeding mode, single-deck stirs 2.5 sides under 3 side's stirrers preparation method, have passed through and mix building-site that sampling Performance Detection, transport mixer in station be transported to 25 kilometers and enter a series of preparation works such as the sampling Performance Detection of pumping hole, the concrete performance going out pumping hole, the concrete performance of entity detection, preparation of construction and inspection, after then carrying out the operation such as concrete pumping, pouring construction.
Through experimental test, prepare high cracking resistance of the present invention, the concrete performance of high workability is: the concrete flowing divergence in 3 hours remains on 740 mm ~ 780mm, 28d ultimate compression strength is 140MPa, intensity 166MPa, folding strength 22MPa, 56 folding strengths are 28MPa, and the strong 160MPa concrete of high cracking resistance of the present invention, high workability superelevation can meet the performance requriements of following movie theatre high cracking resistance, the concrete building of the strong 160MPa of high workability superelevation at everyways such as ultimate compression strength performance, resistance to cleavage, function of slump protection, whipping performance, pump-conveying properties.
Claims (5)
1. a 160MPa ultra high strength concrete for high cracking resistance, high workability, is characterized in that, this concrete one-tenth be grouped into and proportioning as follows:
Composition folk prescription consumption proportion (kg/m
3)
Cement 645 ~ 680
Breeze 280 ~ 300
Flyash 160 ~ 190
Silicon ash 252 ~ 283
Natural sand 980 ~ 1080
Steel fiber 238 ~ 260
Admixture 40 ~ 48
Mixing water 160 ~ 169;
Above-mentioned admixture is polycarboxylate high performance water-reducing agent, and the water-reducing rate of this polycarboxylate high performance water-reducing agent is 35% ~ 40%, is not less than 3 hours the time of collapsing to concrete guarantor; The fineness modulus of described natural sand is 1.0 ~ 1.4, and particle diameter is not more than 1.16mm, and silt content is no more than 1.5%, and apparent density is not less than 2600 kg/m
3; Described steel fiber is milling type, diameter is 0.25mm ~ 0.3mm, length is 20mm ~ 25mm, density is 7.8 × 10
3kg/m
3; This concrete divergence in 3 hours remains on 750 mm ± 50mm, 56d normal curing ultimate compression strength more than 160MPa, 56d normal curing folding strength 25MPa and more than, shipment distance reaches 25km.
2. the 160MPa ultra high strength concrete of a kind of high cracking resistance according to claim 1, high workability, is characterized in that, described breeze grade is S105, and degree of mobilization ratio is not less than 105%, 28d activity and is not less than 110%, and specific surface area is not less than 520 m
2/ kg.
3. the 160MPa ultra high strength concrete of a kind of high cracking resistance according to claim 1, high workability, it is characterized in that, the silicate cement of described cement to be strength grade be P.II52.5,28d glue sand ultimate compression strength is not less than 60MPa, 56d glue sand ultimate compression strength is not less than 70MPa, the consumptive use of water normal consistence of cement is not more than 26%, tricalcium aluminate C in cement
3a mineral constituent content is no more than 6.5%, and the specific surface area of cement is not more than 350m
2/ kg.
4. the 160MPa ultra high strength concrete of a kind of high cracking resistance according to claim 1, high workability, is characterized in that, described flyash is II level high calcium ash, and apparent density is no more than 2.35 × 10
3kg/m
3, loss on ignition is not more than 1.0%, and water demand ratio is no more than 100%.
5. the 160MPa ultra high strength concrete of a kind of high cracking resistance according to claim 1, high workability, is characterized in that, described silicon ash is Powdered, SiO
2content is no less than 95%, and median size is at 0.1 μm ~ 0.3 μm, and specific surface area is 20 m
2/ g ~ 28m
2/ g.
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| CN105272020A (en) * | 2015-11-20 | 2016-01-27 | 上海建工材料工程有限公司 | C40 pump concrete with heat resisting temperature of 500 DEG C |
| CN105272027A (en) * | 2015-09-23 | 2016-01-27 | 江苏苏博特新材料股份有限公司 | Ultra-high performance concrete with compressive strength of 300MPa or more and preparation method |
| CN105948660A (en) * | 2016-06-14 | 2016-09-21 | 同济大学 | High-strength ultra-high-toughness 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 |
| CN110627434A (en) * | 2019-09-19 | 2019-12-31 | 中地国际工程有限公司 | High-strength anti-seismic concrete and preparation method thereof |
| CN113004001A (en) * | 2021-02-26 | 2021-06-22 | 上海宝冶工程技术有限公司 | Superfluid steam-curing-free ultrahigh-performance concrete and preparation method thereof |
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| 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 |
| CN110627434A (en) * | 2019-09-19 | 2019-12-31 | 中地国际工程有限公司 | High-strength anti-seismic concrete and preparation method thereof |
| CN113004001A (en) * | 2021-02-26 | 2021-06-22 | 上海宝冶工程技术有限公司 | Superfluid steam-curing-free ultrahigh-performance concrete and preparation method thereof |
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