CN105155774A - Duplex channel steel and recycled concrete combination beam - Google Patents

Duplex channel steel and recycled concrete combination beam Download PDF

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Publication number
CN105155774A
CN105155774A CN201510485548.4A CN201510485548A CN105155774A CN 105155774 A CN105155774 A CN 105155774A CN 201510485548 A CN201510485548 A CN 201510485548A CN 105155774 A CN105155774 A CN 105155774A
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China
Prior art keywords
channel steel
concrete
steel
water
waste
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CN201510485548.4A
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CN105155774B (en
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伍凯
桑胜涛
曹平周
南洋
张贺
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Hohai University HHU
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Hohai University HHU
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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
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention discloses a duplex channel steel and recycled concrete combination beam, comprising first channel steel and second channel steel riveted to the first channel steel. Shear-resistant connectors are disposed at the bottom of the first channel steel. The first channel steel is filled with recycled aggregate concrete. The second channel steel is fixedly connected through rivets. The thickness of a web of the second channel steel is greater than that of a web of the first channel steel. A replacement rate of recycled aggregate in the recycled aggregate concrete is 50%. In the combination beam, the lower channel steel is provided for bearing tension, the concrete in the upper channel steel is provided for bearing pressure, respective performances of the upper and lower channel steel can be given to full play, and bending resistance of the combination beam is higher; under same performances, the combination beam is lighter in weight and the seismic capacity is favorably improved; braces and form boards for use in a construction phase can be reduced, and construction is greatly facilitated; the lower channel steel gives full play to the tensile strength, the building structure is simplified, fewer rebars are tied, and construction efficiency is improved.

Description

Double-deck channel-section steel-regeneration concrete compound beam
Technical field
The invention belongs to building structure field, especially a kind of compound beam.
Background technology
Along with the progress of Chinese Urbanization's, the problem of building waste (discarded object) is taken seriously gradually.As taked simply to stack mode process, annual newly-increased building waste process will take up an area at least 1.5 hundred million square metres.Regeneration concrete then can address this problem well as a kind of new material.
Along with the development of social economy and building structure, the application of steel-concrete combined structure gets more and more, steel-concrete combined structure has given full play to concrete bearing compressive force and steel bear the mechanical properties of materials of pulling force, what the application of steel can reduce concrete structure crosses heavy in section, alleviates deadweight and is conducive to the raising of anti-seismic performance.
Existing transfer structure for SRC beams is embedded in concrete by shaped steel, outwards flexing concrete cracking outside the edge of a wing may be caused due to section steel flange will be prevented, so certain thickness concrete cover will be had, cause shaped steel unbending to play not exclusively, the concrete of tensile region does not play a role and but adds the deadweight of component; The concrete used mostly is armored concrete, although armored concrete can binding type steel and concrete acting in conjunction effectively, assembling reinforcement is mostly artificial colligation, and production efficiency lowly, is unfavorable for that millworkization is produced.
Summary of the invention
Goal of the invention: provide a kind of double-deck channel-section steel-regeneration concrete compound beam, to solve the above-mentioned problems in the prior art.
Technical scheme: a kind of double-deck channel-section steel-regeneration concrete compound beam, it is characterized in that, the second U-steel comprising the first U-steel and rivet with described first U-steel, the bottom of described first U-steel is provided with shear connector, is filled with regenerated aggregate concrete in the first U-steel; Described second U-steel is fixedly connected with by rivet, and the thickness of described second U-steel web is greater than the thickness of the first U-steel web, and in described regenerated aggregate concrete, the substitution rate of regeneration aggregate is 50%.
Further, described regenerated aggregate concrete comprises each component of following weight ratio, water: cement: sand: waste bricks: waste concrete block=1:(2 ~ 2.5): (2 ~ 2.5): (1 ~ 1.2): (4.8 ~ 5.5).
Further, described regenerated aggregate concrete comprises each component of following weight ratio, water: cement: sand: waste bricks: waste concrete block=1:2.27:2.27:1.04:5.21.
Further, described regenerated aggregate concrete also comprises the water requirement that discarded concrete aggregate 10min water absorption rate calculates.
Beneficial effect: in the present invention, by arranging lower floor's U-steel tension, the concrete compression in the U-steel of upper strata, can give full play to respective performance, the bending resistance of compound beam is stronger; Under same performance, weight of the present invention is lighter, is conducive to improving shock resistance; Different from existing structure, the present invention can reduce support and the template of construction stage, brings great convenience to construction; While lower floor's U-steel gives full play to tensile strength, enormously simplify architectural construction, decrease reinforcing bar binding, improve efficiency of construction; Be easy to inside lower floor's U-steel arrange all kinds of communication electronic device, house clear height can be increased, improve space availability ratio.In a further embodiment, regenerated aggregate concrete can use recovery building waste, turns waste into wealth, and economizes on resources, protection of the environment.
Accompanying drawing explanation
Fig. 1 is the schematic cross-section of the double-deck channel-section steel-regeneration concrete compound beam of the embodiment of the present invention.
Fig. 2 is the front view of the double-deck channel-section steel-regeneration concrete compound beam of the embodiment of the present invention.
Detailed description of the invention
As shown in Figure 1, a kind of double-deck channel-section steel-regeneration concrete compound beam, the second U-steel 2 (being seen as lower floor's U-steel from orientation) comprising the first U-steel 1 (being seen as upper strata U-steel from orientation) and rivet with the first U-steel 1.The bottom of the first U-steel is provided with shear connector 5, is filled with regenerated aggregate concrete 3. in the first U-steel
As depicted in figs. 1 and 2, the second U-steel is fixedly connected with by rivet 4, and the thickness of the second U-steel web is greater than the thickness of the first U-steel web, is subject to load that rivet hands down and flexing to prevent the steel web of the second U-steel.
In described regenerated aggregate concrete, the substitution rate of regeneration aggregate is 50%.Further, described regenerated aggregate concrete comprises each component of following weight ratio, water: cement: sand: waste bricks: waste concrete block=1:(2 ~ 2.5): (2 ~ 2.5): (1 ~ 1.2): (4.8 ~ 5.5).
In further embodiment, the proportioning of applicant to regenerated aggregate concrete is optimized, and comparatively preferred ratio range is water: cement: sand: waste bricks: waste concrete block=1:(2 ~ 2.5): (2 ~ 2.5): (1 ~ 1.2): (4.8 ~ 5.5).
Take strength grade as the concrete of C35 be example:
The weight ratio of each component of embodiment 1 is, water: cement: sand: waste bricks: waste concrete block=1:2.27:2.27:1.04:5.21.Adopt standard method to detect, experimental data is as follows: slump 180, and workability is excellent, 7 days compressive strength 28.5MPa, 28 days compressive strength 43.5MPa.
1, preparation strength f is determined cu, 0
f cu.0＝f cu,k+1.645σ
When concrete strength grade is C35, σ=5.0MPa, then
f cu,0＝48.2MPa
2, water/binder ratio W:C is tentatively determined
Because of the cement 28d observed strength f that this experiment is used cethe unknown, now expects that cement 28d observed strength can reach 48.0MPa.Coarse aggregate is rubble, A=0.46, B=0.07
W C = Af c e f c u , 0 + ABf c e = 0.46 × 48.0 48.2 + 0.46 × 0.07 × 48.0 = 0.44
3, unit consumption of water according to a preliminary estimate
Maximum particle diameter is 40mm.Because discarded concrete block is subject to larger External Force Acting in shattering process, and discarded concrete block can produce a large amount of crack in sintering procedure, makes the water absorption rate of regenerated aggregate and rate of water absorption all far above natural aggregate.It is generally acknowledged, recycled coarse aggregate water absorption rate exceedes about 5% of natural aggregate.Therefore, need to be adjusted on the water supply volume basis of initial setting.
When maximum particle diameter is 40mm, m w0=175kg/m 3, through adjustment, m w=184kg/m 3
4, cement consumption is calculated
(1) m C = m W W / C = 193 0.44 = 439 k g
(2) m C = m W W / C = 184 0.44 = 418 k g
5, tentatively sand coarse aggregate ratio β is chosen s
(1) the maximum particle diameter 30mm of concrete rubble used, water/binder ratio is 0.44, and linearly table look-up β s=33.2%
(2) the maximum particle diameter 40mm of concrete rubble used, water/binder ratio is 0.44, and linearly table look-up β s=30.7%
6, sand, equivalent stone consumption m is calculated s, m g
m W ρ W + m C ρ C + m S ρ S + m G ρ G + 10 α = 1
β S = m S m S + m G × 100 %
Above-mentioned two formula of simultaneous, solve required m s, m g
7, the amount of required alternative waste bricks and discarded concrete block is obtained;
This experiment refers to volume substitution rate (substitution rate of expection discards loam brick 20%, discarded concrete block 80%), obtains the density p of discarded brick body block by discharge opeing displacement method rBwith the density p of discarded concrete block rC, obtain the quality of required waste bricks body and discarded concrete block block:: m R B = ρ R B × n % m G ρ G , m R C = ρ R C × m % m G ρ G ; In formula, m rB, ρ rBbe respectively quality and the density of waste bricks, n is the volume substitution rate of waste bricks, and m is the substitution rate of waste concrete block, m+n=1, m rC, ρ rCbe respectively quality and the density of waste concrete block;
Trying to achieve concrete mix according to above-mentioned calculating is: m w: m c: m s: m rB: m rC=1:2.27:2.77:1.04:5.21.
Embodiment 2 ~ 5, correlated process reference example 1, adjustment relevant parameter, obtains proportioning as follows:
The weight ratio of each component of embodiment 2 is, water: cement: sand: waste bricks: waste concrete block=1:2.11::2.48:1.15:5.25.Adopt standard method to detect, experimental data is as follows: slump 160, and workability is excellent, 7 days compressive strength 22.5MPa, 28 days compressive strength 45MPa.
The weight ratio of each component of embodiment 3 is, water: cement: sand: waste bricks: waste concrete block=1:2.45:2.18:1.18:1.89.Adopt standard method to detect, experimental data is as follows: slump 175, and workability is good, 7 days compressive strength 24.5MPa, 28 days compressive strength 47.5MPa.
The weight ratio of each component of embodiment 4 is, water: cement: sand: waste bricks: waste concrete block=1:2.36:2.39:1.09:5.05.Adopt standard method to detect, experimental data is as follows: slump 155, and workability is excellent, 7 days compressive strength 20.5MPa, 28 days compressive strength 48.5MPa.
The weight ratio of each component of embodiment 5 is, water: cement: sand: waste bricks: waste concrete block=1:2.40:2.06:1.12:5.15.Adopt standard method to detect, experimental data is as follows: slump 185, and workability is good, 7 days compressive strength 21.5MPa, 28 days compressive strength 46.5MPa.
Described regenerated aggregate concrete also comprises the water requirement that discarded concrete aggregate 10min water absorption rate calculates.
The substitution rate of control group is that 0,28d intensity is about 48MPa, and the intensity of this enforcement remains basically stable with it, and performance is better than existing regenerated aggregate concrete formula.
Embodiment 6-8
Other process reference examples 1, in this group embodiment,
The processing procedure of waste bricks is further:
The impurity such as glass, plastics and reinforcing bar in removing regeneration aggregate (waste bricks and waste concrete block), use jaw crushing crusher machine; Adopt the screening of 50mm aperture, proceed fragmentation to residue in sieve, carry out the screening of 20mm aperture, retain residue in sieve to sieve end residue, sieve end residue abandons; Rinse regeneration aggregate with water, dry.
After the proportioning calculating water outlet, cement, sand, rubble and waste bricks, add modifying regenerated aggregate material.
Modifying regenerated aggregate material comprises: water reducing agent, reinforcing agent and expansion agent.The consumption of water reducing agent is the 0.1-0.5wt% of batching total amount, and the consumption of reinforcing agent is the 3-5wt% of batching total amount, and expansion agent is the 1-3wt% of batching total amount.
The structural formula of described water reducing agent is as follows:
Wherein, R 1, R 2, R 3, R 4and R 5all be selected from H or CH 3, n is 35 ~ 55, m is 25 ~ 45, a, b, c and d are positive integer, and M is monovalent cation.
Described reinforcing agent is silicon ash, and expansion agent is aluminium sulfate.
The preparation method of above-mentioned new polycarboxylic acid water reducer, step is as follows:
Step 1: preparation or purchase macromonomer, take raw material according to predetermined proportioning;
Step 2: alkyl, polyether, acrylic monomers, polymerization inhibitor, catalyzer and association's aqua are joined in reactor and be warming up to 160 DEG C, reflux state carries out esterification 5 hours, obtains intermediate product; Catalyzer is selected from sulfuric acid, toluenesulfonic acid, solid acid ZrO 2one or more, it is a kind of or several that said polymerization inhibitor is selected from hydroxyanisol, benzenediol, phenothiazine, described association aqua be selected from ethyl acetate, isoamyl alcohol one or both.
Step 3: isolate intermediate product and be heated to 90 DEG C and dissolve, drip other monomers and initiator solution, time for adding is 1.2 hours simultaneously, dropwise rear insulation 6 hours, after having reacted, be cooled to 40 DEG C, regulate pH to be 7 with sodium hydroxide solution, namely obtain target product.
In embodiment 6, water, cement, sand, rubble are identical with embodiment 1 with the proportioning of waste bricks, add the water reducing agent of 0.26wt%, the reinforcing agent of 4.1wt% and the expansion agent of 1.9wt%.
In embodiment 7, water, cement, sand, rubble are identical with embodiment 2 with the proportioning of waste bricks, add the water reducing agent of 0.11wt%, the reinforcing agent of 3.2wt%, and the expansion agent of 2.7wt%.
In embodiment 8, cement, sand, rubble are identical with embodiment 3 with the proportioning of waste bricks, add the water reducing agent of 0.45wt%, the reinforcing agent of 4.9wt%, and the expansion agent of 1.2wt%.
Adopt identical method of testing, the data of the 28d intensity obtained are as follows: 48.8,53.4 and 55.5.
In this group embodiment, cleaning and regeneration aggregate, can remove the dust of attachment on it, silicon ash can lack void content and the void size of inside concrete simultaneously, improve the cement paste structure on aggregate interface, the volcano ash effect of silicon ash and particulate filing effect, the caking property of slurry and aggregate is good.High efficiency water reducing agent, can not only reduce water/binder ratio, and what is more important makes the cement in mix more disperse, and the void content after sclerosis and distribution of pores situation are further improved.Expansion agent can offset the contraction that regeneration aggregate produces, and solves the problem that prior art regenerated aggregate concrete shrinkage factor is large.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple equivalents to technical scheme of the present invention, these equivalents all belong to protection scope of the present invention.It should be noted that in addition, each the concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, can be combined by any suitable mode.

Claims (4)

1. double-deck channel-section steel-regeneration concrete compound beam, it is characterized in that, the second U-steel (2) comprising the first U-steel (1) and rivet with described first U-steel, the bottom of described first U-steel is provided with shear connector (5), is filled with regenerated aggregate concrete (3) in the first U-steel; Described second U-steel is fixedly connected with by rivet (4), and the thickness of described second U-steel web is greater than the thickness of the first U-steel web, and in described regenerated aggregate concrete, the substitution rate of regeneration aggregate is 50%.
2. double-deck channel-section steel-regeneration concrete compound beam as claimed in claim 1, it is characterized in that, described regenerated aggregate concrete comprises each component of following weight ratio, water: cement: sand: waste bricks: waste concrete block=1:(2 ~ 2.5): (2 ~ 2.5): (1 ~ 1.2): (4.8 ~ 5.5).
3. double-deck channel-section steel-regeneration concrete compound beam as claimed in claim 2, is characterized in that, described regenerated aggregate concrete comprises each component of following weight ratio, water: cement: sand: waste bricks: waste concrete block=1:2.27:2.27:1.04:5.21.
4. double-deck channel-section steel-regeneration concrete compound beam as claimed in claim 2 or claim 3, is characterized in that, described regenerated aggregate concrete also comprises the water requirement that discarded concrete aggregate 10min water absorption rate calculates.
CN201510485548.4A 2015-08-10 2015-08-10 Double-deck channel-section steel regeneration concrete combination beam Expired - Fee Related CN105155774B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105781013A (en) * 2016-05-09 2016-07-20 广西大学 Aluminum alloy and concrete rectangular cross section combined beam

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08277507A (en) * 1995-04-07 1996-10-22 P S Co Ltd Steel-concrete combined girder
JP2000291145A (en) * 1999-04-01 2000-10-17 Shimizu Corp Composite structural member and skeleton structure using it
JP2001027005A (en) * 1999-07-14 2001-01-30 Nippon Steel Corp Connection structure of steel member and concrete in a composite structure
CN1480264A (en) * 2003-07-08 2004-03-10 健 王 Method for treating inorganic solid waste and application
WO2006031001A1 (en) * 2004-09-15 2006-03-23 Samsung Corporation Steel-concrete sandwitch type hybrid beam and high strengh hybrid structure system using the same
CN104072058A (en) * 2014-06-10 2014-10-01 郑州大学 Recycled concrete produced from construction wastes and production method thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08277507A (en) * 1995-04-07 1996-10-22 P S Co Ltd Steel-concrete combined girder
JP2000291145A (en) * 1999-04-01 2000-10-17 Shimizu Corp Composite structural member and skeleton structure using it
JP2001027005A (en) * 1999-07-14 2001-01-30 Nippon Steel Corp Connection structure of steel member and concrete in a composite structure
CN1480264A (en) * 2003-07-08 2004-03-10 健 王 Method for treating inorganic solid waste and application
WO2006031001A1 (en) * 2004-09-15 2006-03-23 Samsung Corporation Steel-concrete sandwitch type hybrid beam and high strengh hybrid structure system using the same
CN104072058A (en) * 2014-06-10 2014-10-01 郑州大学 Recycled concrete produced from construction wastes and production method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105781013A (en) * 2016-05-09 2016-07-20 广西大学 Aluminum alloy and concrete rectangular cross section combined beam

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