CN1317219C - Method of controlling expansion of steel pipe concrete precisely - Google Patents
Method of controlling expansion of steel pipe concrete precisely Download PDFInfo
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- CN1317219C CN1317219C CNB2005100194760A CN200510019476A CN1317219C CN 1317219 C CN1317219 C CN 1317219C CN B2005100194760 A CNB2005100194760 A CN B2005100194760A CN 200510019476 A CN200510019476 A CN 200510019476A CN 1317219 C CN1317219 C CN 1317219C
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- expansion
- swelling agent
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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
Abstract
The present invention relates to a method for controlling the expansion of steel pipe concrete, particularly to a method for precisely controlling the expansion of steel pipe concrete. The present invention is characterized in that the present invention has the following steps: 1. expansion agent is precisely designed and controlled: (1) an expansion source and raw material of the expansion agent are selected; (2) the component of the expansion agent is precisely designed and controlled; (3) the grain grading of the expansion agent is precisely designed and controlled; 2. material for regulating the relative humidity in the concrete is prepared and selected; 3. the expansion amount of the concrete is comprehensively and precisely designed and controlled: the steel pipe concrete has the mixing proportion that water glue rate is from 0.28 to 0.42; the unit water use quantity is from 175 to 195kg per m<3>; the unit cement use quantity is from 400 to 500kg per m<3>; the sand ratio is from 35 to 42 percent; the mixing quantity of the expansion agent is 10 to 18 percent of the total quality; the mixing quantity of fly ash and cinder is 0 to 20 percent + 0 to 25 percent of the total quality; the total mixing quantity is less than or equal to 25 percent; the mixing quantity of the material for regulating the humidity is 10 to 20 percent of the proportion of the sand use quantity; the mixing quantity of the high-efficiency water reducing agent is 0.8 to 1.8 percent of the total quality. The present invention realizes precise control of the expansion of the steel pipe concrete.
Description
Technical field
The invention belongs to building material field, relate to a kind of method that can control expansion of steel pipe concrete.
Background technology
Concrete filled steel tube is plain concrete to be poured into steel pipe and the matrix material made, and its composite design principle is: concrete is subjected to the lock ring effect of steel pipe walls, and intensity and toughness can improve greatly; Filled concrete in the steel pipe, can improve stability of structure and reduce steel using amount; The comprehensive price ratio of composition material obviously is better than two kinds of materials self.Its gordian technique is that core concrete and steel pipe walls are combined closely, and obtains composite effect, could realize designed composite performance like this.There is the intrinsic contraction of volume to a certain degree in normal concrete sclerosis back, so core concrete must be designed to have volumetric expansion and controllable performance.But existing various expansive concrete technology are difficult to satisfy this requirement at present, mainly are that swell increment is difficult to meticulous control, and concrete non-homogeneous expansion is even, easily cause concrete and steel pipe walls unsticking to form cavity, and the composite design performance of concrete filled steel tube can't be brought into play.Be because present cement expansive material expansion energy is lower on the one hand, the expansible time length is short, be that concrete filled steel tube is in closed environment on the other hand, outside moisture can't enter and replenish the moisture that consumes owing to hydrated cementitious, thereby can not produce the compensate for shrinkage effect in the agent of hydrated cementitious late expansion owing to lack the required moisture of reaction.In addition, people do not have the theory of meticulous control swell increment, just do not go meticulous design swell increment often at all, do not have the technology of accurately design and control expansion of steel pipe concrete yet.
Summary of the invention
At present expansive concrete swell increment can't meticulous control situation, the purpose of this invention is to provide a kind of method of controlling expansion of steel pipe concrete precisely.
Technical scheme of the present invention is: a kind of method of controlling expansion of steel pipe concrete precisely is characterized in that: step is as follows:
1, meticulous design of swelling agent and regulation and control:
(1) swelling agent expansion sources and starting material are chosen:
Exist the early expansion can be lower at present cement expansive material, expansion stable period is shorter, and concrete filled steel tube is in closed state, do not have extraneous moisture supply and be difficult to make swelling agent to expand with the problem of compensation later stage contraction, one aspect of the present invention is designed to the expansion sources of swelling agent by AFt, Mg (OH)
2And Fe (OH)
3Three kinds of expansion sources, wherein the AFt expansion sources utilizes the differential responses process of different substances generation to adjust the relation of speed of expansion, expansion and intensity, promptly being designed to provides the very fast expansion energy of speed of expansion higher early expansion source AFt by sulphoaluminate cement clinker and anhydrite, and provides the moderate expansion energy of speed of expansion higher expansion sources AFt in mid-term by giving birth to alum and anhydrite; The late expansion source Mg (OH) that speed of expansion is slower
2Then being designed to is provided with the mutually higher slag of RO by the calcining periclasite; The late expansion source Fe (OH) that speed of expansion is slower
3Then being designed to is provided by the mutually higher slag of RO.In swelling agent, mix a certain amount of porous materials such as zeolite powder on the other hand with certain porosity, make its water that stores at the aquation initial stage the concrete later stage during lack of water since pressure difference discharge, expand to produce for the expansion component aquation, zeolite powder also provides AFt to form required Al simultaneously
2O
3
Described sulphoaluminate cement clinker, its mineral composition are C
4A
3S:50～82%, C
4AF:3～13%, C
2S:5～37%;
Described MgO can be the MgO of periclasite after 950～1050 ℃ of calcination;
Described anhydrite can be natural or artificial anhydrite;
It is zeolite powder of 25～40% etc. that described porous material can be porosity, and its consumption accounts for 10%～20% of each starting material sum of swelling agent;
Described slag can be 400～500m
2/ kg and RO phase K
mThe slag of (MgO/ (FeO+MnO))＞1.
(2) meticulous design of swelling agent component and regulation and control:
The raw-material proportioning of swelling agent designs by the chemical constitution in the table 1, simultaneously, according to the speed of expansion of different expansion sources, expansion energy size and with the relation of performances such as concrete shrinkage, intensity, the chemical constitution of swelling agent except that press table 1 control also need to SO
3/ Al
2O
3, SO
3/ MgO and SO
3Three indexs of/FeO are carried out following control (representing by mass ratio), that is:
SO
3/Al
2O
3＝2～3；
SO
3/MgO＝4～5；
SO
3/FeO＝6～8。
The chemical ingredients of table 1 swelling agent
| Chemical ingredients | SO 3 | Al 2O 3 | CaO | MgO | SiO 2 | FeO | R 2O |
| Content/% | 25～35 | 10～15 | 15～35 | 6～8 | 15～35 | 4～6 | 0.2～0.75 |
Swelling agent chemical constitution after the above-mentioned meticulous design is regulated and control by raw-material proportioning.
(3) meticulous design of swelling agent grain composition and regulation and control:
The grain composition of swelling agent has directly influenced its speed of expansion and expansion character, and is too many as fine powder, and drying shrinkage is big, and the expansion drop is big; Meal is too many, and speed of expansion is too slow, and rate of expansion is low.The grain composition of swelling agent is carried out meticulous design by table 2:
The grain composition of table 2 swelling agent
| Granularity/μ m | ＜45 | 45～100 | 100～250 | ＞250 |
| Content/% | 5～10 | 35～45 | 40～55 | 5～10 |
2. inside concrete relative humidity is regulated material preparation and is chosen:
Can not produce the subject matter of design swell increment because of the later stage lack of water at concrete filled steel tube, introduce a kind of moisture control material that can store a certain amount of moisture in advance and when inside concrete relative humidity sharply descends, discharge moisture, provide moisture to continue aquation for swelling agent, compensate for shrinkage also produces expansion.
The raw material of moisture control material can adopt Chemical Composition to be mainly CaO, Al
2O
3, Fe
2O
3, SiO
2, MgO and K
2O, Na
2Raw materials such as O, its chemical constitution mass range then exists: SiO
255～65%, Al
2O
318～25%, Fe
2O
36～10%, CaO+MgO4～6%, K
2O+Na
2O2～5%, loss on ignition 3～5%.Wherein, between CaO and the MgO any proportioning, K
2O and Na
2It between the O any proportioning.
Moisture control material preparation process flow process as shown in Figure 1, high temperature kiln temperature control condition: roasting 15～20min under 1100～1300 ℃ of conditions; Tapping temperature is controlled at 800～900 ℃; Cooling system: coming out of the stove is chilled to 700 ℃, at 7000～400 ℃ of slowly coolings, chilling below 400 ℃; Granules preparation: the bulk material that sintering is formed adopts impact breaker or hammer mill to be crushed to 2～16mm, and particle surface is carried out special processing obtains the moisture control material.
The volume of moisture control material is 10～20% of a sand consumption.
3. the comprehensive meticulous control of expansion of steel pipe concrete:
Remove swelling agent, outside the moisture control material, the expansion of concrete filled steel tube also with cement kind and consumption, the kind of adulterant and water reducer and volume, factors such as concrete strength grade are closely related, so the comprehensive meticulous meticulous design and control technique that is controlled at swelling agent of expansion of steel pipe concrete amount of the present invention, on the moisture control material technology basis, according to strength grade of concrete, indexs such as adulterant and water reducer volume, concrete mix (seeing Table 3) the especially volume of cement expansive material is carried out following meticulous design, to reach the optimization coupling of gelling material, concrete strength and expansible coordinated development and the meticulous control of expansible:
(1) determines the basic volume of swelling agent according to gelling material
Make the SO of " cement+adulterant+swelling agent " system
3Equal 5% to determine the basic volume of swelling agent;
(2) determine expansive agent dosage according to strength grade of concrete, adulterant and water reducer
The basic volume of expansive agent dosage=swelling agent * (1+m/25) * [1+log (Ja/ β)] * γ
M is the total volume of adulterant (%) in the formula;
Ja is water reducer volume (%);
β is the water reducer influence coefficient, if water reducer is a naphthalene water reducer, then β=0.7 is a polycarboxylate dehydragent as if water reducer, then β=0.9;
γ is the strength grade of concrete influence coefficient, if strength grade≤C50, if γ=1 then is strength grade＞C50, then γ=1.1.Adulterant is meant flyash, slag etc.
Table 3 concrete filled steel tube proportioning
| Water-cement ratio | Unit consumption of water (kg/m 3) | Unit cement consumption (kg/m 3) | Sand coarse aggregate ratio (%) | Expansive agent dosage (%) | Flyash and scoriaceous total volume (%) | Moisture control material volume (%) (being the ratio of sand consumption) | Water reducer volume (%) |
| 0.28～0.42 | 175～195 | 400～500 | 35～42 | 10～18 | 0～20+0～25 (total volume≤25) | 10-20 | 0.8～1.8 |
Wherein, cement is 32.5,42.5,52.5 ordinary portland cements (silicate cement or pulverized fuel ash cement or slag cement);
Swelling agent is above-mentioned swelling agent;
The moisture control material is above-mentioned moisture control material;
Flyash is II level flyash or I level flyash;
Slag is S95 slag or S105 slag;
Water reducer is a high efficiency water reducing agent, as the polycarboxylic acid high efficiency water reducing agent;
Water is tap water.
Sand coarse aggregate ratio is the per-cent that fine aggregate accounts for (being fine aggregate and the coarse aggregate) total amount of gathering materials, and wherein coarse aggregate is the rubble of 5～20mm or 5～25mm or the interval particle diameter of 5～31.5mm continuous grading; Fine aggregate is that fineness modulus is the sand of 2.3-3.1.
Characteristics of the present invention:
1, the present invention is by meticulous design and control technique to the expansion sources of swelling agent, starting material, chemical composition, grain composition, the moisture control material technology, and according to indexs such as strength grade of concrete, adulterant and water reducer volumes, volume to concrete mix especially cement expansive material carries out meticulous design, with the meticulous control of the optimization coupling that reaches gelling material, concrete strength and expansible coordinated development and swell increment;
2, one aspect of the present invention is designed to the expansion sources of swelling agent by AFt, Mg (OH)
2And Fe (OH)
3Three kinds of expansion sources, in swelling agent, mix a certain amount of porous materials such as zeolite powder on the other hand with certain porosity, make its water that stores at the aquation initial stage the concrete later stage during lack of water since pressure difference discharge, expand to produce for the expansion component aquation, zeolite powder also provides AFt to form required Al simultaneously
2O
3
The present invention adopts meticulous design of swelling agent and control technique, in course of hardening, discharge moisture in good time, quantitatively so that the moisture control material technology that concrete expansion physical reaction is normally carried out, and the concrete of considering features such as strength grade of concrete, adulterant consumption, water reducer kind and volume expand comprehensive meticulous design and control techniques, realize the meticulous control of expansion of steel pipe concrete.
Description of drawings
Fig. 1 is a moisture control material preparation process schema of the present invention
Embodiment
Embodiment 1 (C50 concrete filled steel tube):
Starting material:
(1) cement,
42.5 ordinary Portland cement,
(2) swelling agent,
With sulphoaluminate cement clinker, periclasite MgO, natural or artificial anhydrite, the porosity after 950～1050 ℃ of calcination 25～40% porous materials such as zeolite powder, specific surface area 400～500m
2/ kg and RO phase K
mThe slag of (MgO/ (FeO+MnO))＞1 is pressed SO
3/ Al
2O
3=2.6, SO
3/ MgO=4.4, SO
3The chemical constitution of/FeO=6 and table 1 is prepared burden, and the homogenizing grinding to grain composition to table 2 scope, adorn bag at last, seal up for safekeeping, make that expansion energy is big, speed of expansion rationally, can make concrete expansion continually and steadily, expansion component and grain composition obtain the swelling agent of meticulous control.
(3) moisture control material,
By shale is that raw material is prepared from by technical process Fig. 1, and particle diameter is at 2～7.5mm, and the 24h water-intake rate is 15～20% moisture control material.
(4) flyash,
I level flyash,
(5) gather materials: coarse aggregate is the rubble of the interval particle diameter of 5-20mm continuous grading, crush values＜10%, faller gill shape content＜10%; Fine aggregate is that fineness modulus is the sand of 2.3-3.1.
(6) water reducer,
Water reducer: polycarboxylic acid high efficiency water reducing agent, water-reducing rate 28-30%.
Cooperate performance when:
Table 4 C50 concrete filled steel tube cooperates performance (kg/m when
3)
| Cement | Water | Flyash | Coarse aggregate | Sand | Water reducer | Swelling agent | The moisture control material | Ultimate compression strength/MPa | The initial slump (mm) | The slump behind the 3h (mm) |
| 420 | 190 | 80 | 1083 | 510 | 1.3％ | 55 | 73 | 59 | 220 | 190 |
Limited expansion rate (* 10 under 20 ± 3 ℃ of air tight conditions of table 5 C50 concrete filled steel tube
-4)
| 7 days | 28 days | 56 days | 90 days | 180 days |
| 2.7 | 3.7 | 3.8 | 3.7 | 3.7 |
Embodiment 2 (C60 concrete filled steel tube):
Starting material:
(3) cement:
52.5 ordinary Portland cement,
(4) swelling agent:
With sulphoaluminate cement clinker, periclasite MgO, natural or artificial anhydrite, the porosity after 950～1050 ℃ of calcination 25～40% porous materials such as zeolite powder, specific surface area 400～500m
2/ kg and RO phase K
mThe slag of (MgO/ (FeO+MnO))＞1 is pressed SO
3/ Al
2O
3=2.6, SO
3/ MgO=4.4, SO
3The chemical constitution of/FeO=6 and table 1 is prepared burden, and the homogenizing grinding to grain composition to table 2 scope, adorn bag at last, seal up for safekeeping, make that expansion energy is big, speed of expansion rationally, can make concrete expansion continually and steadily, expansion component and grain composition obtain the swelling agent of meticulous control.
(3) moisture control material:
By shale is that raw material is prepared from by technical process Fig. 1, and particle diameter is at 2～7.5mm, and the 24h water-intake rate is 15～20% moisture control material.
(4) flyash,
I level flyash,
(5) gather materials: coarse aggregate is the rubble of the interval particle diameter of 5-20mm continuous grading, crush values＜10%, faller gill shape content＜10%; Fine aggregate is that fineness modulus is the sand of 2.3-3.1.
(6) water reducer:
Water reducer: polycarboxylic acid high efficiency water reducing agent, water-reducing rate 28-30%.
Proportioning and performance
Table 6 C60 concrete filled steel tube proportioning (Kg/m
3) and performance
| Cement | Water | Flyash | Coarse aggregate | Sand | Water reducer | Swelling agent | The moisture control material | Ultimate compression strength/MPa | The initial slump (mm) | The slump behind the 3h (mm) |
| 460 | 185 | 70 | 1050 | 650 | 1.5％ | 66 | 77 | 70 | 220 | 200 |
Limited expansion rate (* 10 under 20 ± 3 ℃ of air tight conditions of table 7 C60 concrete filled steel tube
-4)
| 7 days | 28 days | 56 days | 90 days | 180 days |
| 2.6 | 3.6 | 3.5 | 3.6 | 3.6 |
Claims (1)
1. the method for a controlling expansion of steel pipe concrete precisely, it is characterized in that: step is as follows: 1). meticulous design of swelling agent and regulation and control:
(1) swelling agent expansion sources and starting material are chosen: the expansion sources with swelling agent is designed to by AFt, Mg (OH) on the one hand
2And Fe (OH)
3Three kinds of expansion sources are mixed porosity and are 25～40% zeolite powder porous material on the other hand in swelling agent; Starting material are: sulphoaluminate cement clinker, and the MgO of periclasite after 950～1050 ℃ of calcination, natural or artificial anhydrite, porosity is 25～40% zeolite powder, 400～500m
2/ kg and RO phase K
mThe slag of (MgO/ (FeO+MnO))＞1; Described sulphoaluminate cement clinker, its mineral composition are C
4A
3S:50～82%, C
4AF:3～13%, C
2S:5～37%;
(2) meticulous design of swelling agent component and regulation and control:
It is SO that the chemical composition of swelling agent is removed by the quality percentage composition
3: 25～35%, Al
2O
3: 10～15%, CaO:15～35%, MgO:6-8%, SiO
2: 15～35%, FeO:4～6%, R
2O:0.2～0.75% control, and press mass ratio: SO
3/ Al
2O
3=2～3; SO
3/ MgO=4～5; SO
3/ FeO=6～8 controls;
(3) meticulous design of swelling agent grain composition and regulation and control:
The grain composition of swelling agent is by granularity/μ m:＜45 its quality percentage compositions are 5～10%, its quality percentage composition of granularity/μ m:45～100 is 35～45%, its quality percentage composition of granularity/μ m:100～250 is 40～55%, granularity/μ m:＞250 its quality percentage compositions are 5～10%, carry out meticulous design and control;
2). inside concrete relative humidity is regulated material preparation and is chosen: select the Chemical Composition mass range to exist: SiO
2: 55～65%, Al
2O
3: 18～25%, Fe
2O
3: 6～10%, CaO+MgO:4～6%, K
2O+Na
2The starting material of O:2～5%, loss on ignition 3～5% utilize rotary kiln roasting 15～20min under 1100～1300 ℃ of conditions; Tapping temperature is controlled at 800～900 ℃, is chilled to 700 ℃, and 700～400 ℃ of slowly coolings are adopted chilling below 400 ℃; Adopt impact breaker or hammer mill to be crushed to 2～16mm after being cooled to room temperature, make the moisture control material of regulating inside concrete relative humidity; The volume of moisture control material is 10～20% of a sand consumption;
3). comprehensive meticulous design of concrete swell increment and control: concrete filled steel tube proportioning: water-cement ratio 0.28～0.42, unit consumption of water 175～195kg/m
3, unit cement consumption 400～500kg/m
3Sand coarse aggregate ratio 35～42%, the shared total mass 10～18% of expansive agent dosage, the shared total mass 0～20%+0 of flyash+fine slag contents～25% and total volume≤25%, moisture control material volume is the ratio 10-20% of sand consumption, the shared total mass 0.8～1.8% of high efficiency water reducing agent volume;
The volume of swelling agent carries out following meticulous design: (1) determines the basic volume of swelling agent according to gelling material: make the SO3 of " cement+adulterant+swelling agent " system equal 5% to determine the basic volume of swelling agent;
(2) determine expansive agent dosage according to strength grade of concrete, adulterant and water reducer:
The basic volume of expansive agent dosage=swelling agent * (1+m/25) * [1+log (Ja/ β)] * γ
In the formula: m is the total volume of adulterant (%);
Ja is water reducer volume (%);
β is the water reducer influence coefficient, if water reducer is a naphthalene water reducer, then β=0.7 is a polycarboxylate dehydragent as if water reducer, then β=0.9;
γ is the strength grade of concrete influence coefficient, if strength grade≤C50, if γ=1 then is strength grade＞C50, then γ=1.1.
Priority Applications (1)
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|---|---|---|---|
| CNB2005100194760A CN1317219C (en) | 2005-09-22 | 2005-09-22 | Method of controlling expansion of steel pipe concrete precisely |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100194760A CN1317219C (en) | 2005-09-22 | 2005-09-22 | Method of controlling expansion of steel pipe concrete precisely |
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| Publication Number | Publication Date |
|---|---|
| CN1772691A CN1772691A (en) | 2006-05-17 |
| CN1317219C true CN1317219C (en) | 2007-05-23 |
Family
ID=36759854
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|---|---|---|---|
| CNB2005100194760A Expired - Fee Related CN1317219C (en) | 2005-09-22 | 2005-09-22 | Method of controlling expansion of steel pipe concrete precisely |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100369856C (en) * | 2006-06-01 | 2008-02-20 | 上海交通大学 | Early strength micro expansion steel fiber road concrete |
| CN101537665B (en) * | 2008-03-21 | 2010-07-28 | 北京康之维科贸有限公司 | Method for controlling humidity of sand and stone material in automatic production process of colored concrete |
| CN103435317B (en) * | 2013-08-16 | 2015-04-08 | 武汉理工大学 | Compound expanding agent for inhibiting temperature rising in early stage and promoting hydration in later stage and preparation method thereof |
| CN104591643B (en) * | 2014-12-25 | 2017-01-11 | 安徽工业大学 | Preparation method of expansion rate-controllable steel pipe and steel-slag concrete column |
| CN104478344B (en) * | 2014-12-25 | 2016-06-08 | 安徽工业大学 | A kind of concrete preparation method of steel slag expansion |
| CN104671687A (en) * | 2015-01-23 | 2015-06-03 | 湖州丰盛新材料有限公司 | Concrete expansive agent and preparation method thereof |
| CN105906262B (en) * | 2016-04-15 | 2018-02-16 | 湖北大学 | It is a kind of to continue fine expansion control concrete filled steel tube |
| CN109231866B (en) * | 2018-10-12 | 2021-10-22 | 天津市金盛源特种建材有限公司 | Hydration heat inhibition type concrete expanding agent and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1562857A (en) * | 2004-03-29 | 2005-01-12 | 武汉理工大学 | Method for keeping expansion of steel tube concrete |
| CN1562860A (en) * | 2004-03-29 | 2005-01-12 | 武汉理工大学 | Steady inflated steel tube concrete and construction method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1562857A (en) * | 2004-03-29 | 2005-01-12 | 武汉理工大学 | Method for keeping expansion of steel tube concrete |
| CN1562860A (en) * | 2004-03-29 | 2005-01-12 | 武汉理工大学 | Steady inflated steel tube concrete and construction method |
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