CN103102116A - Concrete for shear wall structure - Google Patents

Concrete for shear wall structure Download PDF

Info

Publication number
CN103102116A
CN103102116A CN2013100445443A CN201310044544A CN103102116A CN 103102116 A CN103102116 A CN 103102116A CN 2013100445443 A CN2013100445443 A CN 2013100445443A CN 201310044544 A CN201310044544 A CN 201310044544A CN 103102116 A CN103102116 A CN 103102116A
Authority
CN
China
Prior art keywords
concrete
flyash
cement
shear
water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2013100445443A
Other languages
Chinese (zh)
Inventor
冯社林
乔建华
殷凤英
何万选
孙雁刚
宋淑芬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHAANXI COAL CHEMICAL INDUSTRY CONSTRUCTION (GROUP) Co Ltd
Original Assignee
SHAANXI COAL CHEMICAL INDUSTRY CONSTRUCTION (GROUP) Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SHAANXI COAL CHEMICAL INDUSTRY CONSTRUCTION (GROUP) Co Ltd filed Critical SHAANXI COAL CHEMICAL INDUSTRY CONSTRUCTION (GROUP) Co Ltd
Priority to CN2013100445443A priority Critical patent/CN103102116A/en
Publication of CN103102116A publication Critical patent/CN103102116A/en
Pending legal-status Critical Current

Links

Classifications

    • 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 concrete for a shear wall structure. The concrete is prepared from cement, sand, gravel, water and coal ash which can partially replace the cement according to the conventional concrete preparation process. According to the concrete, the concrete performance is improved, the quality of concrete is guaranteed, the cement is saved, the concrete cost is reduced, and the resources are saved.

Description

The concrete that is used for shear wall structure
Technical field
The invention belongs to building field, relate to a kind of material of construction, relate in particular to a kind of concrete for shear wall structure.
Background technology
In traditional concrete proportioning, cement is main consolidating material, along with constantly increasing of strength grade of concrete, add the impact of fine aggregate quality in local starting material, cement consumption has caused the hydration heat rising increasing gradually, easily generation inside concrete crack, affect concrete quality.
Flyash is a kind of large industrial residue of fuel-burning power plant discharging, is the byproduct in fuel-burning power plant.Because flyash contains active higher vitreum mineral, can with hydrolysis product of cement Ca (OH) 2Secondary reaction of hydration occuring, have certain activity, has the resource of lateral reactivity.Utilize flyash to replace in the part of cement concrete batching and can not only change concrete workability and weather resistance, again a kind of packing material of particulate preferably simultaneously, and the further prolongation along with the concrete length of time, flyash is continuous aquation also, the flyash activity effect is significantly brought into play, concrete pore texture also can constantly improve, and intensity is still increasing, and other performance will be further improved.
But in the concrete production process, although " flyash concrete utilisation technology standard " made regulation to flyash starting material and applied structure thereof and maximum replacement amount in (GBJ146-90), but because the material resources quality of various places is not quite similar, thereby replace cement amount for flyash, randomness is larger, makes concrete quality wayward.
Summary of the invention
In order to solve the above-mentioned technical problem that exists in background technology, but the invention provides a kind of concrete that is used for shear wall structure that reduces cement consumption, reduces concrete production cost and saving resource.
Technical solution of the present invention is: the invention provides a kind of concrete for shear wall structure, its special character is: described concrete for shear wall structure be by cement, sand, rubble, water and the flyash that can partly replace cement routinely concrete preparation technology be prepared from.
The consumption that above-mentioned flyash replaces cement be when not replacing cement the cement total mass 20%~35%.
The consumption that above-mentioned flyash replaces cement be when not replacing cement the cement total mass 30%.
Above-mentioned concrete for shear wall structure be by cement, sand, rubble, flyash and water be in mass ratio 1:2.46:3.57:0.43:0.47 routinely concrete preparation technology be prepared from.
Above-mentioned concrete for shear wall structure also is added with pumping agent.
Above-mentioned concrete for shear wall structure by cement, sand, rubble, flyash, pumping agent and water be in mass ratio 1:2.46:3.57:0.43:0.02:0.47 routinely concrete preparation technology be prepared from.
The fineness 0.045mm of above-mentioned flyash tails over and is not more than 25%; The water demand ratio of described flyash is not more than 105%; The loss on ignition of described flyash is not more than 8%; The water content of described flyash is not more than 1%.
Advantage of the present invention is:
The invention provides a kind of concrete for shear wall structure, as concrete adulterant, the concrete of the formation of adding coal ash is conceived to utilize more fully the lateral reactivity of flyash with flyash, reduces cement consumption, reduces the concrete production cost; Turn waste into wealth, turn harm into good, save a large amount of valuable soil of stacking flyash; Larger performance high-performance advantage is improved the concrete serviceability, weather resistance and physical and mechanical property.Can say, enlarge the range of application of Green High Performance concrete, can obtain larger social environment and technical economic benefit, be the only way that this mainstay industry of construction industry and building industry is able to Sustainable development.The solid waste such as a large amount of flyash that thermoelectricity produces, the discharging of powdered coal cinder, contaminate environment not only, and take a large amount of soils, become large public hazards of society.Utilize powdered coal cinder as Additive, the preparation flyash concrete is realized making a silk purse out of a sow's ear, and to country, to enterprise, is all favourable undoubtedly.Good economic benefit is not only arranged, can also receive the economic results in society of good protection territory, environment purification, save energy.Not only reduced cement consumption, reduced the concrete production cost, improved concrete workability, pumpability, reduced the effect such as hydration heat of concrete and widely apply.Alleviated again due to a large amount of flyash pollution on the environment of power plant emission, saved again resource simultaneously.The present invention with flyash mix can reach after concrete improve concrete performance, guarantee concrete quality, save cement, reduce Cost of Concrete, the advantage such as economize on resources; utilize to greatest extent local resource, reducing raw-material shipment distance is also the requirement of environment protection and green construction.
Description of drawings
Fig. 1 is that the concrete slump provided by the present invention is with the change curve of doping quantity of fly ash;
Fig. 2 is normal concrete and the gain in strength graphic representation in the concrete different length of times of its different doping quantity of fly ash.
Embodiment
The invention provides a kind of concrete for shear wall structure, the concrete that should be used for shear wall structure be by cement, sand, rubble, water and the flyash that can partly replace cement routinely concrete preparation technology be prepared from.
The consumption that flyash replaces cement is 20%~35% of cement total mass, preferably 30%.
The concrete that is used for shear wall structure be by cement, sand, rubble, flyash and water be in mass ratio 1:2.46:3.57:0.43:0.47 routinely concrete preparation technology be prepared from.
The concrete that is used for shear wall structure also is added with pumping agent; The concrete that is used for shear wall structure by cement, sand, rubble, flyash, pumping agent and water be in mass ratio 1:2.46:3.57:0.43:0.02:0.47 routinely concrete preparation technology be prepared from.
The fineness 0.045mm of flyash tails over and is not more than 25%; The water demand ratio of described flyash is not more than 105%; The loss on ignition of described flyash is not more than 8%; The water content of described flyash is not more than 1%.
The present invention selects following material and proportioning:
Cement: by the performance analysis to P.SA32.5 Portland blastfurnaceslag cement and P.O42.5 ordinary Portland cement.Obtain following test-results, ultimate compression strength was respectively in 3 days: 14.9MPa and 18.8MPa, 28 days ultimate compression strength are respectively: 36.4MPa and 46.8MPa.The P.S32.5 cement normal consistency needs that the water ratio is 28.0%, fineness is 4.4%; It is 28.4% that the P.O42.5 cement normal consistency needs the water ratio; Indices meets existing " general purpose portland cement " GB175-2007 standard-required.
Sand: used respectively two kinds of sand, a kind of fine sand, fineness modulus MX=1.8, apparent density is 2530Kg/m3, and porosity is 44%, and silt content is 0.8%; A kind of is medium sand, fineness modulus MX=2.3, and apparent density is 2680Kg/m3, and porosity is 44%, and silt content is 1.6%;
Stone: used respectively two kinds of rubbles, 10~20mm simple grain level rubble, its apparent density is 2890Kg/m3, and porosity is 37%, and silt content is 0.5%, and elongated particles is 8%, crush index is 8%; 10~30mm simple grain level rubble, its apparent density is 3100Kg/m3, and porosity is 39%, and silt content is 0.7%, and elongated particles is 5%, crush index is 9%;
Admixture: combination is according to the actual service condition of unit, the KDNOF-7 High strength pumping agent pulvis (it is take beta-naphthalenesulfonic-acid salt formaldehyde condensation products as main component) that has adopted Shanxi triumphant enlightening admixture factory to produce, volume is the 0.6-1.2% of gelling material, and water-reducing rate is 20-25%; Meet " concrete admixture " GB8076-2008 standard-required.
Flyash: according to the difference of the place of production of flyash, kind, combustion system, the mode of gathering dust, compare for three kinds of flyash that this locality produces, finally the fineness 0.045mm of selected flyash tails over and is not more than 25%; The water demand ratio of described flyash is not more than 105%; The loss on ignition of described flyash is not more than 8%; The water content of described flyash is not more than 1%.
Water: tap water.
3) process of the test
This engineering shear wall is to adopt large steel moulding plate to install, and top board adopts the loose spelling of bamboo offset plate, and large steel moulding plate is made separant with bavin machine oil, and the brush separant carried out installing of large punching block after airing in 24 hours again.Concrete adopts pumping to build, form removal in 24 hours after concrete placement, and form removal time end is seen obvious crack, has then sprayed again curing compound concrete is carried out maintenance.The concrete appearance moulding is better, the crack problem that produces when solving well normal concrete member (shear wall) demoulding under high temperature.
In construction, concrete adopts the pumping symmetry to build, and one sliding every 2 hours, each sliding height is 300.Surface Quality of Concrete has obtained good improvement, and is concrete by the problem of drawing crack when effectively solving under high temperature slding form operation.
Strength grade is that the mix proportion of C30 is:
The impact of different replacement amounts on concrete performance
Table: C30(W/C=0.53)
Sequence number FA replacement rate C:FA:S:G:W:KDNOF-7 Water (W) Cement (C) Flyash (II) Slump (mm)
1 0 396:628:1166:0:210:7.9 210 396 0 165
2 20% 316:682:1112:79:210:6.3 210 316 79 168
3 30% 277:682:1112:119:210:5.5 210 277 119 174
4 40% 238:682:1112:158:210:4.8 210 238 158 178
Annotate: (1) test with starting material is: P.O42.5 cement, fine sand (fineness modulus MX=1.8), 10 ~ 20mm rubble, flyash, the agent of KDNOF-7 type High strength pumping.(2) concrete density is 2400Kg/m 3
Draw concrete slump with the change curve of doping quantity of fly ash as shown in Figure 1 by the testing data of above each table:
Can be found out significantly by upper figure, in the situation that assurance water consumption and water cement ratio are constant, replace part of cement with flyash equivalent, when doping quantity of fly ash was 20%, concrete flowability remained unchanged substantially, was steady state; Doping quantity of fly ash is 20%~30% the time, and the slump increases with the increase of doping quantity of fly ash, and concrete flowability increases with the volume of flyash; After doping quantity of fly ash surpassed 30%, the slump reduced rapidly, namely mixes appropriate flyash, can play certain water-reduction.This is that these globular glass physical efficiencys significantly reduce the surrender shear-stress of concrete mix because fly ash grain is comprised of vitreum and only a few carbon granules substantially, thereby improves the mobility of mixture.
Appropriate flyash can also well improve cohesiveness, water-retentivity and the workability of concrete mix.Because the density ratio cement of flyash is little, after it replaces part of cement, make concrete obtain more gelling slurry volume, can increase the cohesiveness of mixture; Bead particles in flyash plays to the bleeding passage effect of intercepting, can improve the water-retentivity of mixture: the fine particle of flyash is filled in hole fine and close not in concrete, the moisture of originally filling wherein is released, improves the workability of mixture.
Can find out in the middle of experiment, the concrete cohesiveness that mixes flyash is all good than normal concrete, and when doping quantity of fly ash increased, it is better that concrete workability is improved, and is easier to the pumping of constructing simultaneously.
The impact of the flyash of different addition quantity on concrete strength
Table: C30(W/C=0.53)
Annotate: (1) test with starting material is: P.O42.5 cement, fine sand (fineness modulus MX=1.8), 10 ~ 20mm rubble, flyash, the agent of KDNOF-7 type High strength pumping.(2) concrete density is 2400Kg/m3
Can find out from the testing data of above each table: in the situation that assurance water consumption and water cement ratio are constant, replace part of cement with flyash, larger on the impact of cement mortar early strength, and later stage intensity particularly the 90d age strength is little with the amplitude that the volume of flyash changes, can think substantially to be consistent, this phenomenon main manifestations is the anaphase effect of flyash.
Can find out from experimental result, doping quantity of fly ash is larger, and early strength is lower, and the later stage strength development is higher.
This is that in mixing the concrete of flyash, hydration reaction first occurs for cement and water because flyash is the adulterant with certain activity, generates product C a (OH) 2, flyash and Ca (OH) 2Secondary reaction of hydration can occur, and generate the product take hydrated calcium silicate and drated calcium aluminate as main body, but this is a process comparatively slowly.there is document to point out, 7d is during the length of time, the fly ash grain surface has no change, this illustrates the concrete hardening initial stage, flyash only plays filling effect, improve the performance of concrete mix, to not contribution of concrete strength, during 28d, a small amount of hydrated product appears in the fly ash grain surface. along with the prolongation in the length of time, the hydrated product on fly ash grain surface increases gradually, fly ash grain surface meeting after aquation produces a large amount of hydrated calcium silicate and drated calcium aluminate fibrous crystals fully, their mutual cross connections, has very high cohesive strength, these hydrated calcium silicates closely are connected with Behavior of Hardened Cement Paste with the drated calcium aluminate crystal, can effectively improve the mechanical strength of flyash concrete.
This just shows, mixes flyash in concrete, and the effect of two aspects is arranged, and flyash as the integral part of the gelling material of activity, also can be used as the Additive of inertia on the one hand on the one hand.
The gain in strength curve in the normal concrete of each strength grade and the concrete different length of times of its different doping quantity of fly ash is as shown in Figure 2:
Can find out particularly early strength of intensity that mixing of flyash can have influence on concrete significantly from above chart, doping quantity of fly ash is larger, and the early strength of concrete is just lower, but later strength rises appreciably.
Test result analysis:
Test-results is as shown in the table:
In test, by common proportioning (benchmark proportioning) and adding coal ash proportioning 7 days, 14 days, 28 days, 60 days and 90 days strength ratios, find under same water cement ratio, doping quantity of fly ash is that 20%, 30% C30 concrete seven sky, the intensity of 28 days are lower than the identical age strength of normal concrete, and later stage intensity (60 days) is higher than the intensity with normal concrete in the length of time, and doping quantity of fly ash is that 20%, 30% C40 post-strength of concrete (60 days) is a little less than 115% of its design strength.
According to digital proof in test, (with existing ground material) with the cement of coal ash instead 20~30%, is more satisfactory volume.In addition, from the trial mix situation, the serviceability of mixing concrete of flyash is greatly improved.
by administering engineering dependents' district C district C17 at certain mining area coal-mining subsidence, application (C35 concrete in the concrete construction on the raft board concrete basis in C24 building, doping quantity of fly ash is 40%), and (C30 concrete in the agent structure more than 14 layers of this project, doping quantity of fly ash is 30%), return silo engineering (the C40 concrete of coal measures system run coal bin engineering with the Xiangshan mine, doping quantity of fly ash is 30%) the engineering application process in, the workability of concrete mix improves, carry in the cast-in-site process smoothly, be showed no obvious crack after the sliding formwork of silo is sliding and after the form removable of shear wall.
The scene is respectively 17 #14 layers of main bodys and 24 #Respectively extracted 14 days during the construction of 14 layers of main bodys, each two groups of 28 days, 60 days concrete test blocks, carried out normal curing, measured result is as shown in the table:
Find from the test-results in each length of time, the flyash concrete early strength increases slower, and the later stage gain in strength is accelerated, and has all surpassed 115% of standard concrete strength grade in the time of 60 days.

Claims (7)

1. concrete that is used for shear wall structure is characterized in that: described concrete for shear wall structure be by cement, sand, rubble, water and the flyash that can partly replace cement routinely concrete preparation technology be prepared from.
2. the concrete for shear wall structure according to claim 1 is characterized in that: the consumption that described flyash replaces cement be when not replacing cement the cement total mass 20%~35%.
3. the concrete for shear wall structure according to claim 2 is characterized in that: the consumption that described flyash replaces cement be when not replacing cement the cement total mass 30%.
4. the concrete for shear wall structure according to claim 4 is characterized in that: described concrete for shear wall structure be by cement, sand, rubble, flyash and water be in mass ratio 1:2.46:3.57:0.43:0.47 routinely concrete preparation technology be prepared from.
5. the concrete for shear wall structure according to claim 4, it is characterized in that: described concrete for shear wall structure also is added with pumping agent.
6. the concrete for shear wall structure according to claim 5 is characterized in that: described concrete for shear wall structure by cement, sand, rubble, flyash, pumping agent and water be in mass ratio 1:2.46:3.57:0.43:0.02:0.47 routinely concrete preparation technology be prepared from.
7. according to claim 1 and 2 or 3 or 4 or 5 or 6 described concrete for shear wall structure, it is characterized in that: the fineness 0.045mm of described flyash tails over and is not more than 25%; The water demand ratio of described flyash is not more than 105%; The loss on ignition of described flyash is not more than 8%; The water content of described flyash is not more than 1%.
CN2013100445443A 2013-02-04 2013-02-04 Concrete for shear wall structure Pending CN103102116A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2013100445443A CN103102116A (en) 2013-02-04 2013-02-04 Concrete for shear wall structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2013100445443A CN103102116A (en) 2013-02-04 2013-02-04 Concrete for shear wall structure

Publications (1)

Publication Number Publication Date
CN103102116A true CN103102116A (en) 2013-05-15

Family

ID=48310356

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2013100445443A Pending CN103102116A (en) 2013-02-04 2013-02-04 Concrete for shear wall structure

Country Status (1)

Country Link
CN (1) CN103102116A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106316296A (en) * 2016-08-24 2017-01-11 浙江省建工集团有限责任公司 Formulation suitable for grain reserve warehouse silo slips form construction concrete

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101306935A (en) * 2008-07-04 2008-11-19 周志华 Premixed concrete produced by tailings
CN102260064A (en) * 2010-10-30 2011-11-30 鞍钢集团矿业公司 Fly ash flow state concrete produced from tailings
CN102775102A (en) * 2012-08-10 2012-11-14 山东大元实业股份有限公司 Metal mine waste rock concrete

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101306935A (en) * 2008-07-04 2008-11-19 周志华 Premixed concrete produced by tailings
CN102260064A (en) * 2010-10-30 2011-11-30 鞍钢集团矿业公司 Fly ash flow state concrete produced from tailings
CN102775102A (en) * 2012-08-10 2012-11-14 山东大元实业股份有限公司 Metal mine waste rock concrete

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106316296A (en) * 2016-08-24 2017-01-11 浙江省建工集团有限责任公司 Formulation suitable for grain reserve warehouse silo slips form construction concrete

Similar Documents

Publication Publication Date Title
CN105016690B (en) Method for production of concrete from water quenched nickel-iron slag
CN100562505C (en) Ultra-fine carbonate rock powder concrete composite blending material and preparation method thereof
CN102503263A (en) Building hollow brick using industrial tailings and preparation method thereof
CN104446175A (en) Recycled high-performance concrete and preparation method thereof
CN107401159A (en) A kind of premixing fluidised form solidified earth
CN107459301A (en) A kind of premixing fluidised form solidified earth
CN108203281B (en) Micro-expansion grouting material and preparation method thereof
CN102040360B (en) Tailing sand brick with high weather resistance and preparation method thereof
CN104140229A (en) Shrinkage-compensating recycled concrete and preparation method thereof
KR101788677B1 (en) the filling material with high fluidity and low strength using bottom ash
CN102173684A (en) Concrete prepared from tunnel waste slag and mineral admixture with large mixing amount and preparation method thereof
CN103708748A (en) Modified phosphogypsum material used for sea reclamation
CN105541140A (en) Geopolymer injecting paste material and preparing method and application thereof
CN102795819A (en) Low-carbon high-performance tunnel shotcrete composite cementing material
CN103723975B (en) Rapid-hardening steel slag mortar capable of being constructed by spraying
CN103342522A (en) Cracking resisting concrete
KR101299164B1 (en) Solidification material composition for deep soil stabilization including large amount of non-firing binding materials and deep mixing method using thereof
CN105801062A (en) Method for preparing self-leveling floor material from phosphorus solid waste
CN103771800A (en) Bayer process red mud-doped dry-blending masonry mortar and using method thereof
CN103113055A (en) Concrete for sliding film construction of silo structure
CN103387360A (en) Calcium carbide slag cement
CN104446261A (en) High-performance pumpable concrete for well drilling wall and preparation method thereof
CN109626892B (en) Granular curing agent and high-strength low-shrinkage crack-resistant pavement base material prepared from same
Varma et al. Additive to Cement–A Pozzolanic Material-Fly Ash
CN103553515A (en) Premixed plastering dry mortar doped with phosphorous slag powder

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C12 Rejection of a patent application after its publication
RJ01 Rejection of invention patent application after publication

Application publication date: 20130515