CN109400087A - A kind of method-Ca (OH) enhancing alkali-activated carbonatite concrete resisting carbonization2Inner blending method - Google Patents
A kind of method-Ca (OH) enhancing alkali-activated carbonatite concrete resisting carbonization2Inner blending method Download PDFInfo
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- CN109400087A CN109400087A CN201811313455.3A CN201811313455A CN109400087A CN 109400087 A CN109400087 A CN 109400087A CN 201811313455 A CN201811313455 A CN 201811313455A CN 109400087 A CN109400087 A CN 109400087A
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- alkali
- activated carbonatite
- concrete
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- carbonatite concrete
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/08—Slag cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/001—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing unburned clay
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/021—Ash cements, e.g. fly ash cements ; Cements based on incineration residues, e.g. alkali-activated slags from waste incineration ; Kiln dust cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/22—Carbonation resistance
Abstract
A kind of method-Ca (OH) enhancing alkali-activated carbonatite concrete resisting carbonization2Inner blending method.The Ca (OH) that this method passes through 20% -30% (the cementitious material mass ratio) of incorporation when preparing alkali-activated carbonatite concrete2, significantly improve the content of anti-carbonation substance in alkali-activated carbonatite concrete, hence it is evident that improve resisting carbonization, enhance the durability of alkali-activated carbonatite concrete.Ca (OH) simultaneously2Incorporation can also improve in polymerization reaction environment active calcium content, promote the progress of polymerization reaction and the formation of polymerizate, significantly improve the intensity of alkali-activated carbonatite concrete.As New Style Concrete Materials, alkali-activated carbonatite concrete can replace cement concrete, both problem of environmental pollution caused by solid waste bulk deposition can be eliminated, it can alleviate again and portland cement is depended on unduly, reduction consumes non-renewable resources excessively, and energy shortages such a for China and the more serious country of environmental pollution have great importance.
Description
Technical field
A kind of method-Ca (OH) enhancing alkali-activated carbonatite concrete resisting carbonization2Inner blending method
Background technique
Alkali-activated carbonatite concrete is a kind of novel inorganic nonmetallic materials that new development in recent years is got up, and is in alkaline activity material
Most one kind of future.This kind of material is mostly using natural aluminosilicate mineral or industrial solid wastes as primary raw material, with other mines
After polymer blends material and suitable alkali silicate solution are sufficiently mixed, molding is conserved under room temperature or autoclaved condition, be it is a kind of by
The material of aluminosilicate gelling component bonding.Compared with conventional cement concrete, alkali-activated carbonatite concrete is in performance and function, tool
There are the advantages such as high-strength (compression strength is up to 70MPa), high temperature resistant (refractoriness > 1000 DEG C), acidproof alkali salt burn into permeability be low；
In production technology, high-temperature calcination or sintering are not needed, polymerization reaction can be completed in room temperature.Alkali-activated carbonatite concrete energy simultaneously
Consume it is low, it is almost pollution-free.Most importantly alkali-activated carbonatite concrete can recycle, so alkali-activated carbonatite concrete is a kind of environmental protection
Type green construction material, in the near future big trend of the substituted cement concrete as primary building material.
However, scientists find alkali-activated carbonatite concrete as people deepen continuously to alkali-activated carbonatite concrete research
There are obvious deficiencies.Although alkali-activated carbonatite concrete is excited by highly basic, alkali-activated carbonatite concrete in polymerization process not
It only needs to consume a large amount of OH-, and also not may participate in the substance for resisting carbonization in the polymerizate generated, lead to alkali-activated carbonatite
The resisting carbonization wretched insufficiency of concrete.Due to containing certain density CO in air2(0.03%), CO2Pass through diffusion
It is able to enter alkali-activated carbonatite inside concrete, be dissolved in pore solution and forms H2CO3。H2CO3The H released+With pore solution
In OH-Reaction, leads to the decline of pore solution pH.The reduction of pH leads to the destruction of concrete reinforcing steel protective film, accelerates steel
The corrosion of muscle causes the decline of bearing capacity, seriously affects the durability of alkali-activated carbonatite concrete, limits alkali-activated carbonatite concrete in work
Application in journey.Compared with alkali-activated carbonatite concrete, cement concrete has good resisting carbonization, this is because cement is in water
Change in reaction process and generates a large amount of Ca (OH)2(account for about gel total amount 20%).When carburizing reagent occurs, Ca (OH)2Hair
Raw dissolution, releases a large amount of OH-, play the effect for resisting carbonization.
This patent resisting carbonization excellent with reference to cement concrete, it is appropriate by being mixed when preparing alkali-activated carbonatite concrete
Ca (OH)2, the content of anti-carbonation substance in alkali-activated carbonatite concrete is promoted, achievees the purpose that be obviously improved resisting carbonization.Together
When rationally design Ca (OH)2Incorporation, in the Ca (OH) for ensuring to mix2While resistance carbonization can be given full play to, and can
It plays Ca (OH)2Increasing calcium humidification, be obviously improved the intensity of alkali-activated carbonatite concrete.Therefore Ca (OH)2Inner blending method significantly improves
The content of anti-carbonation substance, has been obviously improved the resisting carbonization of alkali-activated carbonatite concrete, has delayed alkali in alkali-activated carbonatite concrete
Excite the rusting rate of concrete reinforcing steel, it is ensured that alkali-activated carbonatite concrete has good durability, exists to alkali-activated carbonatite concrete
Application in engineering has great importance.
Summary of the invention
1. a kind of method-Ca (OH) for enhancing alkali-activated carbonatite concrete resisting carbonization2Inner blending method, it is characterized in that: being swashed with alkali
For sending out slag concrete, raw material composition and its mass percent are as follows: cementitious material is granulated blast-furnace slag micropowder 80%-
70% (264-231kg/m of volume3)；Levigate 20%-30% (66-99kg/m of volume of hydrated lime in powder3)；Fine aggregate is medium coarse sand
(volume 651kg/m3)；Coarse aggregate is rubble (volume 1056kg/m3)；Liquid sodium silicate (the volume 88kg/m of modulus 1-33)；Piece
Alkali (NaOH volume 17.6kg/m3)；Water (volume 92.4kg/m3)；Wherein slag can be replaced flyash, red mud, metakaolin with
Other industrial solid castoffs such as rubbish ash, the preparation for alkali-activated carbonatite concrete.
Preparation method includes: to weigh ingredient and hybrid technique, preparation process, and the specific method is as follows:
(1) ingredient and hybrid technique are weighed: load weighted alkali being added in test water first, is stirred and quiet
Set cooling；Slag micropowder, hydrated lime in powder are subjected to weighing ingredient simultaneously, then two kinds of cementitious materials are put into batch mixer and are mixed
5 minutes.
(2) preparation process: agitated kettle is added in the NaOH solution that will be cooled to room temperature, and uniformly mixed gelling material is added
Material is first stirred 10 seconds slowly and then is stirred fastly 20 seconds.Liquid sodium silicate and test are added with sand and stirred 30 seconds fastly, is eventually adding rubble simultaneously
Stirring fastly can prepare to form for 30 seconds.
2. preparation method according to claim 1, it is characterised in that: the granulated blast-furnace slag is to meet GB/T
S95 as defined in 18046-2008 standard grades of graining blast-furnace cinder micro-powder, granulated blast-furnace slag are handled through iron removal by magnetic separation, and ball milling makes it
Reach specific surface area >=400m2/ kg, wherein superfine graining blast-furnace cinder micro-powder of the partial size less than 30 μm account for the 90% of gross mass with
On；
3. preparation method according to claim 1, it is characterised in that: the white lime is that calcium lime powder is sufficiently disappeared
Hydrated lime in powder after solution, drying, the screen over-size of the square hole screen of 0.08mm are 0；
The utility model has the advantages that as the above scheme is adopted, a kind of side of enhancing alkali-activated carbonatite concrete resisting carbonization
Method-Ca (OH)2Inner blending method has the advantages that
1) it is obviously improved the resisting carbonization of alkali-activated carbonatite concrete
The substance that carbonization is resisted due to lacking, leads to the resisting carbonization wretched insufficiency of alkali-activated carbonatite concrete, causes
The decline of durability hinders application of the alkali-activated carbonatite concrete in engineering.It is mixed by interior when preparing alkali-activated carbonatite concrete
20% -30% Ca (OH)2, it has been obviously improved the content of anti-carbonation substance, has improved the anti-carbonation energy of alkali-activated carbonatite concrete
Power enhances durability, application range of the alkali-activated carbonatite concrete in engineering has been widened significantly, to alkali-activated carbonatite concrete in engineering
In application have great importance.
2) compression strength of alkali-activated carbonatite concrete is significantly improved
The development of alkali-activated carbonatite concrete strength relies primarily on the formation and growth of polymerizate, and calcium activated is polymerizate
The important component of (C-A-S-H and C-S-H gel), the deficiency of active calcium content will seriously affect alkali-activated carbonatite concrete strength
Development.Ca(OH)2Incorporation provide more calcium activateds for alkali-activated carbonatite concrete, compensate for active calcium content it is insufficient lack
It falls into, not only promotes the progress of polymerization reaction and the formation of polymerizate, but also improve polymerization reaction efficiency, be obviously improved
The compression strength of alkali-activated carbonatite concrete makes alkali-activated carbonatite concrete can be used as structural material and applies in engineering, has expanded alkali and has swashed
The application range for sending out concrete has great importance to application of the alkali-activated carbonatite concrete in engineering.
3) shorten curing time, accelerate construction progress
In traditional work progress, cement concrete, which needs to conserve after the completion of pouring 7d ability demoulding, to be continued to construct.
And Ca (OH)2Incorporation improve the polymerization rate of alkali-activated carbonatite concrete, promote the formation of polymerizate, be obviously improved
The early strength of alkali-activated carbonatite concrete, makes the compression strength of alkali-activated carbonatite concrete rise to 40.4MPa when conserving 3d, reaches
The intensity of C30 concrete curing 28d.So Ca (OH)2Inner blending method significantly improves the early strength of alkali-activated carbonatite concrete, greatly
Width shortens the curing time of alkali-activated carbonatite concrete, improves the turnover rate of construction formwork, hence it is evident that accelerates construction progress, significantly reduces
Construction period and cost.
4) significant environmental benefit and social benefit
Trade waste slag, gangue, flyash, rubbish ash etc. is used to prepare alkali-activated carbonatite concrete for primary raw material,
The substitution to cement material can be done step-by-step, reduce the demand to cement material, can not only alleviate manufacture of cement to lime
The too fast consumption of stone, clay and the energy mitigates high energy consumption, high pollution problem brought by manufacture of cement, and can become useless
For treasured, various problem of environmental pollutions brought by successive elimination industrial solid castoff bulk deposition, generated environmental benefit
It will be unable to estimate with social benefit.
Advantage: the present invention passes through Ca (OH)2Inner blending method improves the content of anti-carbonation substance in alkali-activated carbonatite concrete, hence it is evident that
The resisting carbonization for improving alkali-activated carbonatite concrete, enhances the durability of alkali-activated carbonatite concrete.Ca (OH) simultaneously2Incorporation be alkali
The polymerization reaction of excitation concrete provides more calcium activateds, promotes the progress of polymerization reaction and the formation of polymerizate,
Be obviously improved the intensity of alkali-activated carbonatite concrete, the curing time of alkali-activated carbonatite concrete be greatly shortened, hence it is evident that quickening construct into
Degree significantly reduces construction period and cost, substantially increases operation strategies of the alkali-activated carbonatite concrete in construction material.Meanwhile
The application of alkali-activated carbonatite concrete can slow down too fast consumption of the cement manufacture to lime stone raw material, turn waste into wealth, successive elimination
Various problem of environmental pollutions brought by cement are produced, the utilization rate of trade waste is improved, protection environment, there is significant ring
Border benefit and social benefit.
Specific embodiment
A kind of embodiment 1: method-Ca (OH) enhancing alkali-activated carbonatite concrete resisting carbonization2Inner blending method, it is characterized in that:
Raw material composition and its mass percent are as follows: by taking slag alkali-activated carbonatite concrete as an example, cementitious material is granulated blast-furnace slag micropowder
100% (volume 330kg/m3)；Fine aggregate is medium coarse sand (volume 651kg/m3)；Coarse aggregate is rubble (volume 1056kg/m3)；
Liquid sodium silicate (the volume 88kg/m of modulus 2.753)；Piece alkali (NaOH volume 17.6kg/m3)；Water (volume 92.4kg/m3)；With
This carries out accelerated carbonation test, carbonization test condition are as follows: CO for control group2Mass fraction is 20%, and temperature is 20 ± 2 DEG C, wet
Degree is 70 ± 5%.
A kind of embodiment 2: method-Ca (OH) enhancing alkali-activated carbonatite concrete resisting carbonization2Inner blending method, it is characterized in that:
Raw material composition and its mass percent are as follows: by taking slag alkali-activated carbonatite concrete as an example, cementitious material is granulated blast-furnace slag micropowder
80% (volume 264kg/m3)；Levigate 20% (volume 66kg/m of hydrated lime in powder3)；Fine aggregate is medium coarse sand (volume 651kg/m3)；
Coarse aggregate is rubble (volume 1056kg/m3)；Liquid sodium silicate (the volume 88kg/m of modulus 2.753)；Piece alkali (NaOH volume
17.6kg/m3)；Water (volume 92.4kg/m3)；
A kind of embodiment 3: method-Ca (OH) enhancing alkali-activated carbonatite concrete resisting carbonization2Inner blending method, it is characterized in that:
Raw material composition and its mass percent are as follows: by taking slag alkali-activated carbonatite concrete as an example, cementitious material is granulated blast-furnace slag micropowder
70% (volume 231kg/m3)；Levigate 30% (volume 99kg/m of hydrated lime in powder3)；Fine aggregate is medium coarse sand (volume 651kg/m3)；
Coarse aggregate is rubble (volume 1056kg/m3)；Liquid sodium silicate (the volume 88kg/m of modulus 2.753)；Piece alkali (NaOH volume
17.6kg/m3)；Water (volume 92.4kg/m3)；
1. preparation method includes: that weighing ingredient and hybrid technique, preparation process, specific method process are as follows:
(1) ingredient and hybrid technique are weighed: load weighted alkali (table 1) being added in test water first, is stirred
It mixes and stands cooling；Slag micropowder, hydrated lime in powder are subjected to weighing ingredient simultaneously, two kinds of cementitious materials are then put into batch mixer
Middle mixing 5 minutes.
(2) preparation process: agitated kettle is added in the NaOH solution that will be cooled to room temperature, and uniformly mixed gelling material is added
Material is first stirred 10 seconds slowly and then is stirred fastly 20 seconds.Liquid sodium silicate and test are added with sand and stirred 30 seconds fastly, is eventually adding rubble simultaneously
Stirring fastly can prepare to form for 30 seconds.
2. preparation method according to claim 1, it is characterised in that: the granulated blast-furnace slag is to meet GB/T
S95 as defined in 18046-2008 standard grades of graining blast-furnace cinder micro-powder, granulated blast-furnace slag are handled through iron removal by magnetic separation, and ball milling makes it
Reach specific surface area >=400m2/ kg, wherein superfine graining blast-furnace cinder micro-powder of the partial size less than 30 μm account for the 90% of gross mass with
On；
3. preparation method according to claim 1, it is characterised in that: the white lime is that calcium lime powder is sufficiently disappeared
Hydrated lime in powder after solution, drying, the screen over-size of the square hole screen of 0.08mm are 0；
1 alkali-activated carbonatite concrete mix of table and carbonation depth
As can be seen from Table 1, when not mixing hydrated lime in powder, the resisting carbonization of alkali-activated carbonatite concrete C-1 is obviously insufficient.By
Accelerated carbonation test in 7 days, the carbonation depth of C-1 reach 15.7mm, when accelerated carbonation to the 28th day and 60 days, carbonation depth difference
Rise to 20.6mm and 25.9mm.When using Ca (OH)2(20%Ca (OH) is mixed when inner blending method2), alkali-activated carbonatite concrete C-2's is anti-
Carbonization ability is obviously improved.Drop to 12.8mm, 16.1mm and 19.6mm respectively with 60 days carbonation depths within 7 days, 28 days, compares C-
1 reduces 18.5%, 21.8% and 24.3% respectively.With Ca (OH)2The promotion of volume, the anti-carbon of alkali-activated carbonatite concrete C-3
Change ability is further obviously improved.7 days, 28 days with 60 days carbonation depths be further lowered into 9.1mm, 10.5mm with
11.7mm reduces 42%, 49% and 54.8% than C-1 respectively.It can be seen that Ca (OH)2Inner blending method has been obviously improved alkali and has swashed
Send out the resisting carbonization of concrete.
Claims (3)
1. a kind of method-Ca (OH) for enhancing alkali-activated carbonatite concrete resisting carbonization2Inner blending method, it is characterized in that: with alkali-activated carbonatite mine
For dreg concrete, raw material composition and its mass percent are as follows: cementitious material is granulated blast-furnace slag micropowder 80% -70%
(264-231kg/m of volume3)；Levigate 20%-30% (66-99kg/m of volume of hydrated lime in powder3)；Fine aggregate is that medium coarse sand (is mixed
Measure 651kg/m3)；Coarse aggregate is rubble (volume 1056kg/m3)；Liquid sodium silicate (the volume 88kg/m of modulus 1-33)；Piece alkali
(NaOH volume 17.6kg/m3)；Water (volume 92.4kg/m3)；Wherein slag can be replaced flyash, red mud, metakaolin and rubbish
Other industrial solid castoffs such as rubbish ash, the preparation for alkali-activated carbonatite concrete.
Preparation method includes: to weigh ingredient and hybrid technique, preparation process, and the specific method is as follows:
(1) ingredient and hybrid technique are weighed: load weighted alkali being added in test water first, is stirred and stands cold
But；Slag micropowder, hydrated lime in powder are subjected to weighing ingredient simultaneously, then two kinds of cementitious materials are put into batch mixer and mix 5 points
Clock.
(2) preparation process: agitated kettle is added in the NaOH solution that will be cooled to room temperature, and uniformly mixed cementitious material is then added,
It first stirs 10 seconds and then stirs fastly 20 seconds slowly.Liquid sodium silicate and test are added with sand and stirred 30 seconds fastly, is eventually adding rubble and fast
Stirring can prepare to form for 30 seconds.
2. preparation method according to claim 1, it is characterised in that: the granulated blast-furnace slag is to meet GB/T
S95 as defined in 18046-2008 standard grades of graining blast-furnace cinder micro-powder, granulated blast-furnace slag are handled through iron removal by magnetic separation, and ball milling makes it
Reach specific surface area >=400m2/ kg, wherein superfine graining blast-furnace cinder micro-powder of the partial size less than 30 μm account for the 90% of gross mass with
On.
3. preparation method according to claim 1, it is characterised in that: the white lime be calcium lime powder through sufficiently resolution,
Hydrated lime in powder after drying, the screen over-size of the square hole screen of 0.08mm are 0.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114455901A (en) * | 2022-01-28 | 2022-05-10 | 大唐同舟科技有限公司 | Alkali-activated fly ash-based pervious concrete and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114455901A (en) * | 2022-01-28 | 2022-05-10 | 大唐同舟科技有限公司 | Alkali-activated fly ash-based pervious concrete and preparation method thereof |
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