CN104591643B - Preparation method of expansion rate-controllable steel pipe and steel-slag concrete column - Google Patents

Preparation method of expansion rate-controllable steel pipe and steel-slag concrete column Download PDF

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CN104591643B
CN104591643B CN201410820787.6A CN201410820787A CN104591643B CN 104591643 B CN104591643 B CN 104591643B CN 201410820787 A CN201410820787 A CN 201410820787A CN 104591643 B CN104591643 B CN 104591643B
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steel
slag
concrete
steel pipe
slag concrete
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CN104591643A (en
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于峰
徐琳
张扬
王旭良
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Anhui University of Technology AHUT
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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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Abstract

The invention discloses a preparation method of an expansion rate-controllable steel pipe and steel-slag concrete column, and belongs to the technical field of civil engineering. The method is that steel-slag sand is used for replacing all fine aggregates, and ordinary portland cement, steel-slag sand, gravels and water are utilized to prepare the expansion rate-controllable steel pipe and steel-slag concrete column. The method specifically comprises the preparation steps of selecting a steel pipe and steel-slag concrete at a certain strength grade according to the requirement of the bearing capacity of the steel pipe and steel-slag concrete column; determining self stress of the steel pipe; calculating to determine the free expansion rate of the slag-steel concrete; calculating to determine the average particle size of the steel-slag stand; selecting the steel-slag sand with reasonable graduation; calculating to determine the quantity of the used portland cement, the steel-slag sand, the gravels and the water according to a design method of a mixing ratio of ordinary concrete; and preparing the steel pipe and steel-slag concrete column, pouring the steel pipe and steel-slag concrete column and maintaining the steel pipe and steel-slag concrete column. With the adoption of the prepared steel pipe and steel-slag concrete column, the core concrete can early be in a three-directional pressing state, and therefore, the bearing capacity and ductility of the steel pipe concrete can be obviously improved.

Description

A kind of preparation method of the steel pipe steel slag concrete post of controllable expansion rate
Technical field
The invention belongs to technical field of civil engineering, be specifically related to the steel pipe steel slag concrete post of a kind of controllable expansion rate Preparation method, this coupled column rod structure be applicable to civil buildings, industrial premises and bridge structure.
Background technology
Steel core concrete column has the advantages such as bearing capacity height, good, the easy construction of anti-seismic performance, obtains in field of civil engineering Extensively application.But, in steel core concrete column, owing to core concrete can produce volume contraction in condensing hardening process, By causing the cohesive force between steel pipe and core concrete to decline, have a strong impact on every mechanical property of steel core concrete column.
At present, conventional solution mainly has two kinds: one to be incorporation extender, mixing of extender in core concrete Enter the early expansion being only conducive to core concrete, owing to lacking moisture in later stage core concrete, steel pipe and core will be caused Bonding is occurred to depart between concrete.Two is additive and the admixture mixing in core concrete and ensureing late expansion, one Aspect, the incorporation of additive, increase construction cost and difficulty；On the other hand, the addition of admixture, make hardening and the water of concrete Change process is more complicated, is extremely difficult to intended optimum efficiency.
A kind of industrial residue produced when slag is steel-making, it had both had certain hardness and fineness, had had again certain Activity.Therefore, available Steel-slag, for the fine aggregate in concrete, forms steel pipe steel slag expansion concrete, not only solves nature bone The imbalance between supply and demand problem of material, reduces construction costs, saves natural resources, ensures again the expansion of steel pipe inner core concrete, make core Heart concrete enters three dimension stress state in advance, significantly improves bearing capacity and the ductility of concrete filled steel tube.
Summary of the invention
The present invention is directed to shortcoming and deficiency that existing steel core concrete column expansion technique method exists, it is provided that a kind of controlled swollen The preparation method of the steel pipe steel slag concrete post of swollen rate.The present invention makes full use of the lateral reactivity of slag, overcomes prior art side Method fills the deficiencies such as extender, additive or admixture for producing expansion, significantly reduces construction costs and difficulty of construction, meets The property indices requirement of Expansive Concrete Filled Steel Tube.
The preparation method of the steel pipe steel slag concrete post of the present invention a kind of controllable expansion rate, it utilizes Steel-slag Sand to replace all Fine aggregate, uses Portland cement, Steel-slag Sand, rubble and water to prepare the steel pipe steel slag concrete post of controllable expansion rate, tool Body comprises the following steps:
(1) according to steel pipe steel slag concrete columns bearing capacity requirement, steel pipe and the steel slag concrete of some strength grade is selected, The steel pipe seif-citing rate σ produced owing to steel slag concrete expands is calculated according to formula (1)e。
N = ( 1 + 3 σ e f co ) A c f co ( 1 + 1.5 θ ) - - - ( 1 )
Wherein: N is steel pipe steel slag concrete columns bearing capacity；
AcFor core concrete area of section；
fcoFor steel slag concrete comprcssive strength；
θ is the steel pipe constraint transformation to core concrete,AsAnd fyIt is respectively the area of section of steel pipe And yield strength.
(2) the seif-citing rate σ of the steel pipe determined according to step (1)e, the freedom of steel slag concrete is calculated according to formula (2) Expansion rate εc。
ϵ c = σ e E s · ω E c + E s E c - - - ( 2 )
Wherein: EcElastic modelling quantity for concrete；
EsElastic modelling quantity for steel pipe；
R and t is respectively the radius of core concrete and the wall thickness of steel pipe.
(3) by the data in accompanying drawing 1 are carried out regression analysis, steel slag concrete expansion rate and Steel-slag Sand average particle can be obtained Relation between footpath, as shown in formula (3).According to the expansion rate of the steel pipe steel slag concrete that step (2) determines, according to formula (3) calculate the mean diameter of Steel-slag Sand, then select the Steel-slag Sand of rational gradation composition.
D m = 0.063 ϵ c 2 - 0.307 ϵ c + 0.609 - - - ( 3 )
Wherein: DmMean diameter for Steel-slag Sand.
(4) according to the method for designing of common concrete proportioning, can calculate and determine portland cement, Steel-slag Sand rubble and water Consumption, then portland cement, Steel-slag Sand and rubble are put into and concrete mixer stir in advance 60～70 seconds.
(5) water is uniformly poured in the steel slag concrete after step (4) processes and be stirred, measure collapsing of steel slag concrete Degree of falling, increases additional water consumption, and additional water consumption is 50～100kg/m3So that it is meet steel slag concrete pours requirement.
(6) steel slag concrete being stirred is poured in steel pipe, and fully vibrate with vibrating spear, to ensure that slag mixes The density of solidifying soil.
(7) for prevent the loss of moisture in steel pipe steel slag concrete post in maintenance processes, it is ensured that in slag, free CaO exists Expansion in further hydration course of reaction, is coated with one layer of epoxy resin on the steel pipe steel slag concrete column end surface poured, Maintenance certain time condenses hardening completely to it, and steel pipe steel slag concrete can be made to produce intended swell increment.
Compared with prior art, the invention have the advantages that
(1) a kind of industrial residue produced during slag is steelmaking process, utilizes slag to replace the fine aggregate in concrete, no Only can save natural aggregate, it is to avoid environment and natural resources wreck, and the disposal etc. of solid waste can be solved Problem.
(2) Steel-slag Sand has certain water absorption rate, on the one hand can reduce the self-constriction of steel slag concrete hydrated product, separately On the one hand can discharge portion of water the most afterwards and be beneficial in slag after free CaO by water consumption in hydration process The aquation of phase, makes full use of the expansion character of slag.
(3) containing free CaO isoreactivity material in slag, concrete coagulation hardening process will produce volumetric expansion, Make the core concrete in steel pipe enter three dimension stress state in advance, form steel pipe active constraint core concrete, can significantly carry The bearing capacity of high concrete filled steel tube and ductility.
(4) present invention overcomes the deficiency that existing expansion of steel pipe concrete technical method exists, it is not necessary to add in concrete Add extender or admixture, significantly reduce construction costs and the difficulty of construction of concrete filled steel tube, have preferable economic benefit and Social benefit.
Accompanying drawing explanation
Fig. 1 is steel slag concrete free swelling rate and Steel-slag Sand mean diameter graph of a relation.
Detailed description of the invention
Below in conjunction with steel pipe steel slag concrete post instantiation, the present invention is described in detail.
Slag is a kind of industrial waste, and the present invention selects slag to be horse steel slag, uses X-ray fluorescence spectra analysis (XRF) chemical composition recording slag is as shown in table 1, from table 1 it follows that the chemical composition of slag is similar to cement, and tool Certain hydraulically active, main mineral facies is had to include C3S、C2S、RO、C2F, is the expansion that steel slag concrete produces in steel pipe Principal element.The present invention uses Steel-slag Sand to replace whole fine aggregates, utilizes the lateral reactivity of Steel-slag Sand, makes in slag containing free CaO fully expands in further hydration course of reaction, thus reaches core concrete and enter the purpose of three dimension stress state in advance. In the present invention, the particle size range of Steel-slag Sand is 0.15～0.6mm, and modulus of fineness controls, 2.7～3.0, to belong to medium sand II district.
The chemical composition (%) of table 1 slag
Title CaO Fe2O3 SiO2 MgO P2O5 MnO Al2O3 TiO2 V2O5 SO3
Slag 52.71 19.53 12.97 4.31 2.57 2.21 2.12 1.59 1.04 0.308
Standard deviation 0.25 0.20 0.17 0.10 0.08 0.07 0.07 0.06 0.05 0.015
Cement is Binder Materials and the exciting agent of activity of steel slag of steel slag concrete, and the present invention uses Ma'an Mountain's Carnis Rapanae thomasianae board general Logical portland cement, below C50 selects and is numbered 42.5 cement, and more than C50 selects and is numbered 52.5 cement.
Rubble is the coarse aggregate in the present invention, and the present invention selects the rubble of 5～31.5mm continuous grading interval particle diameters, wherein 4.75～16mm account for 20%, and 16～31.5mm rubbles account for 80%, and the apparent density of rubble is 2690kg/m3。
Water is mainly used in mix and the maintenance of steel slag expansion concrete, water must not contain have an impact cement normally condense with firmly The objectionable impurities changed, every tap water that can drink and the natural water of cleaning, can be used to mixing and maintenance steel slag concrete.? On the basis of mix-design water consumption, increasing certain additional water consumption, additional water consumption is 50～100kg/m3。
Steel pipe uses the seamless steel pipe of Q235, and diameter of steel tube D is 140mm, the height L of steel pipe is respectively 500,1000, 1500mm, the wall thickness t of steel pipe are respectively 2.1mm, and the yield strength of steel pipe is 176MPa, and steel tube elastic modulus is 2 × 105MPa, Steel pipe Poisson's ratio is 0.297.
On the basis of determining the steel pipe each material behavior of steel slag concrete post, according to the preparation method of steel pipe steel slag concrete In step (1), select the steel pipe of Q235 and the steel slag concrete of C20, calculate the seif-citing rate σ of steel pipe according to formula (1)eFor 1.42MPa；The free swelling rate ε of steel slag concrete is calculated according to step (2)cIt is 2.8 × 10-4；Calculate according to step (3) and determine The mean diameter of Steel-slag Sand is 0.243mm, and wherein the Steel-slag Sand of 0.15～0.3mm grating interval particle diameter accounts for 75%, 0.3～ 0.6mm grating interval particle diameter Steel-slag Sand accounts for 25%；The cooperation such as table determining each component of steel slag concrete is calculated according to step (4) Shown in 2；Preparing steel slag concrete according to step (5), required additional water consumption is 80kg/m3, record steel slag concrete slump Degree is 400mm, and meet steel slag concrete pours requirement；Then according to step (6)～(7) pour, maintenance steel pipe slag coagulation Earth pillar.
Table 2 steel pipe steel slag expansion concrete mix
Table 3 is steel pipe steel slag concrete columns bearing capacity result of the test.As can be seen from the table, with common steel tube concrete column Compare, the steel pipe steel slag concrete post of present invention surrender bearing power increase amplitude 8%～27%, ultimate bearing capacity increase rate 10%～24%.Therefore, the present invention not only significantly improves the bearing capacity of component, and makes full use of solid waste, reduces Environmental pollution, significantly reduces construction costs, has good technique effect.
Table 3 steel pipe steel slag concrete columns bearing capacity result of the test
Note: N in tableU0 bendsAnd Nu0It is respectively test specimen to count according to " concrete filled steel tube technical regulation " (CECS28:2012) The surrender bearing capacity calculated and ultimate bearing capacity, NUr bendsAnd NurIt is respectively test specimen actual measurement surrender bearing capacity and ultimate bearing capacity.

Claims (1)

1. the preparation method of the steel pipe steel slag concrete post of a controllable expansion rate, it is characterised in that utilize Steel-slag Sand to replace complete Portion's fine aggregate, uses Portland cement, Steel-slag Sand, rubble and water to prepare the steel pipe steel slag concrete post of controllable expansion rate, Specifically include following steps:
(1) according to steel pipe steel slag concrete columns bearing capacity requirement, steel pipe and the steel slag concrete of some strength grade is selected, according to Formula (1) calculates the steel pipe seif-citing rate σ produced owing to steel slag concrete expandse；
Wherein: N is steel pipe steel slag concrete columns bearing capacity；
AcFor core concrete area of section；
fcoFor steel slag concrete comprcssive strength；
θ is the steel pipe constraint transformation to core concrete,AsAnd fyIt is respectively the area of section of steel pipe and bends Take intensity；
(2) the seif-citing rate σ of the steel pipe determined according to step (1)e, the free swelling rate of steel slag concrete is calculated according to formula (2) εc；
Wherein: EcElastic modelling quantity for concrete；
EsElastic modelling quantity for steel pipe；
R and t is respectively the radius of core concrete and the wall thickness of steel pipe；
(3) free swelling rate of the steel slag concrete determined according to step (2), calculates the average of Steel-slag Sand according to formula (3) Particle diameter, then selects the Steel-slag Sand of rational gradation composition；
Wherein: DmMean diameter for Steel-slag Sand；
(4) according to the method for designing of common concrete proportioning, can calculate determine Portland cement, Steel-slag Sand, rubble and The consumption of water, then puts into Portland cement, Steel-slag Sand and rubble and stirs in advance in concrete mixer 60～70 seconds；
(5) water is uniformly poured in the steel slag concrete after step (4) processes and be stirred, measure the slump of steel slag concrete Degree, increases certain additional water consumption, and required additional water consumption is 50～100kg/m3So that it is meet watering of steel slag concrete Build requirement；
(6) steel slag concrete that step (5) is stirred is poured in steel pipe, and fully vibrate with vibrating spear, to ensure steel The density of dreg concrete；
(7) for prevent the loss of moisture in steel pipe steel slag concrete post in maintenance processes, it is ensured that in slag, free CaO is in the later stage Expansion during hydration reaction, is coated with one layer of epoxy resin, maintenance on the steel pipe steel slag concrete column end surface poured Condense hardening to steel slag concrete completely, steel pipe steel slag concrete can be made to produce intended swell increment.
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CN107542221A (en) * 2016-06-28 2018-01-05 内蒙古科技大学 Steel pipe full mineral slag concrete post
CN107572933B (en) * 2017-10-12 2020-04-28 贺州学院 Modified marble powder steel tube concrete column and preparation method thereof
CN111233413B (en) * 2020-01-15 2022-03-11 安徽工业大学 High-expansion-energy steel slag concrete and preparation method thereof
CN111362634A (en) * 2020-05-06 2020-07-03 江苏启坤循环经济产业技术开发有限公司 Method for preparing concrete by using industrial waste slag and steel slag to replace natural sand

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CN1317219C (en) * 2005-09-22 2007-05-23 武汉理工大学 Method of controlling expansion of steel pipe concrete precisely
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