CN102167536B - Secondary ettringite type expanding agent and preparation method and application thereof - Google Patents
Secondary ettringite type expanding agent and preparation method and application thereof Download PDFInfo
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- CN102167536B CN102167536B CN2011100260876A CN201110026087A CN102167536B CN 102167536 B CN102167536 B CN 102167536B CN 2011100260876 A CN2011100260876 A CN 2011100260876A CN 201110026087 A CN201110026087 A CN 201110026087A CN 102167536 B CN102167536 B CN 102167536B
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a secondary ettringite type expanding agent and a preparation method and application thereof. The preparation method comprises the following steps of: stirring a pozzolanic material, a calcium material, plaster and water, forming into a blank or spheres, naturally curing, performing dry heating curing in a curing cell for 0.5 to 10 hours, raising the temperature to 100-170DEG C, and keeping the temperature for 0.5 to 10 hours for dehydration and ettringite decomposition reaction, or standing the formed blank or spheres for 2 to 10 hours, curing under steam pressure, and dehydrating for 0.5 to 10 hours, or dehydrating the thermally synthesized aluminosilicate material and wastes thereof at the temperature of higher than 100DEG C for 0.5 to 10 hours; and mixing and grinding 60 to 95 weight parts of material and 5 to 40 weight parts of anhydrous gypsum, or respectively grinding 60 to 95 weight parts of material and 5 to 40 weight parts of anhydrous gypsum and uniformly mixing to obtain powder of which the specific surface area is more than 200m<2>/kg, namely the secondary ettringite type expanding agent. The secondary ettringite type expanding agent can endow mortar and concrete with micro-expansion property, and improve the volume stability of the mortar and concrete.
Description
Technical field
The invention belongs to the Materials Science and Engineering science and technology field, relate in particular to a kind of preparation and using method thereof of secondary ettringite type swelling agent.
Background technology
A major defect of portland cement concrete goods is at the setting and harden initial stage, because the variation of moisture loss and temperature, humidity causes volumetric shrinkage.Be restricted and the tensile stress that produces when surpassing the tensile strength of concrete self in contraction, cement concrete construction member easily ftractures.Concrete behind the cracking, supporting capacity sharply reduces, because the infiltration meeting of moisture further worsens concrete weather resistance, causes steel bar corrosion, structure deteriorate in addition, reduces concrete use properties.Concrete contraction and cracking problem have become problem extremely general and serious in the engineering practice, how to reduce concrete cubic deformation, improve concrete volume stability, and then improve concrete splitting resistance, prevent that concrete cracking from being the difficult problem that engineering circle needs to be resolved hurrily.
From the material angle, can be by in concrete, mixing steel fiber, polypropylene fibre, dispersive stress is concentrated, and the crack development is organized in the refinement crack; Or mix fine-ground fly-ash or slag powders, and reduce hydration heat, reduce the temperature difference and shrink, improve crack-resistant performance of concrete.But fibrous concrete is mixed system trouble, cost height; Fine-ground fly-ash or slag powders volume are big, material requested cost height, and can not solve concrete shrinkage cracking fully, can only alleviate cracking degree.Thereby mixing swelling agent in cement concrete obtained expansion to a certain degree and stops up the pore crack at the sclerosis initial stage, improve concrete inner structure, be a kind of effective means that improves the cement concrete resistance to cleavage, and it have that expansion character is reliable, construction is simple and advantage such as the folk prescription cost is lower.
At present both at home and abroad the swelling agent that uses is mainly calcium sulphoaluminate type, calcium oxide type and magnesium oxide type, and principle namely generates swelling property material with the hydrated product reaction of water or cement by sulplo-aluminate, CaO, MgO etc. in cement hydration process.On the one hand, under restricted condition, can produce 0.2～0.7MPa compressive pre-stress at inside concrete, improve the concrete stress state, improve resistance to cleavage; On the other hand, the pore seam is filled, stopped up to the dilator of generation, improves the concrete hole structure, improves concrete impermeability.Because the unstable of CaO and MgO itself and expansion process chemical reaction process is seldom used CaO and MgO at present and is done the main component of producing swelling agent, so the aquation calcium sulphoaluminate is to produce the expansion sources that swelling agent mainly utilizes at present.The expansion sources of calcium sulphoaluminate type swelling agent is ettringite (C
3A3CaSO
432 H
2O), according to " swelling theory " and " crystal growth theories ", a large amount of water of absorption finally produces crystallographic expansion in the initial tiny ettringite crystal growing process that forms, thereby forms volumetric expansion, offset and shrink the volume minimizing that causes, reach the effect of compensate for shrinkage.But used sulphoaluminate expander production at present all is to utilize pure raw material such as alum earth, gypsum to carry out pyroprocessing and obtain, complex manufacturing not only, and consume a large amount of natural resourcess, make the swelling agent production cost increase.
Summary of the invention
The object of the present invention is to provide a kind of secondary ettringite type swelling agent and its preparation method and application; swelling agent provided by the invention is guaranteeing to produce under the effect prerequisite of compensate for shrinkage effectively; realize refuse reclamation; turn waste into wealth; save resource; preserve the ecological environment, make sulplo-aluminate type swelling agent low cost, cycle development become possibility.
Technical scheme of the present invention is: a kind of secondary ettringite type swelling agent, and the powder for particle diameter≤80 μ m consists of, and in weight part: it is 60～95 parts that the hydraulicity that high-temperature activation is handled contains the aluminium glue gel material, and dehydrated gyp-is 5～40 parts; Wherein, by percentage to the quality, the scope of the following composition of control is: [SO
3] at 15%～35 %, [Al
2O
3] at 15 %～20 %, [CaO] at 35 %～55 %, MgO≤5%; Alkali content≤0.75%; It is that aluminosilicate material is carried out dehydration reaction at 100 ~ 170 ℃ and obtained that the hydraulicity that described high-temperature activation is handled contains the aluminium glue gel material; The hydraulicity that described high-temperature activation is handled contains the particle diameter≤80 μ m of aluminium glue gel material and dehydrated gyp-, and described dehydrated gyp-is CaSO
4II is for any one high-temperature calcination processing through routine in natural anhydrite, chemical gypsum or the waste gypsum gets.
Prepare the method for described secondary ettringite type swelling agent, will contain Al according to a conventional method
2O
3Pozzolanic materials and lime, gypsum and water after stirring, be shaped to base substrate or balling-up, by percentage to the quality, control following content: [SO
3]＞5%, [Al
2O
3]＞10%, [CaO]＞25%; Then, after the natural curing 1～28 day, in maintenance cellar for storing things in 80 ℃～90 ℃ dry heating curings 0.5～10 hour, be warming up to 100 ℃～170 ℃, constant temperature dewatered and the ettringite decomposition reaction in 0.5～10 hour, the material that obtains and dehydrated gyp-mix grinding or be ground to particle diameter≤80 μ m respectively mix and namely obtain secondary ettringite type swelling agent.
To contain Al according to a conventional method
2O
3Pozzolanic materials and lime, gypsum and water after stirring, be shaped to base substrate or balling-up, by percentage to the quality, control following content: [SO
3]＞5%, [Al
2O
3]＞10%, [CaO]＞25%; Then, with the base substrate of forming or bead quiet stop 2～10 hours after, in 120 ℃～190 ℃ steam press maintenances 1～10 hour, carried out dehydration reaction again 0.5～10 hour, the material that obtains and dehydrated gyp-mix grinding or be ground to particle diameter≤80 μ m respectively mix and namely obtain secondary ettringite type swelling agent.
Described pozzolanic materials is any one in flyash, coal gangue, natural volcanic ash, the powder ash air-entrained concrete.
Described gypsum is any one in natural dihydrate gypsum, natural anhydrite, semi-hydrated gypsum, phosphogypsum dihydrate, desulfurated plaster, fluorgypsum or the waste gypsum.
By percentage to the quality, in the aluminosilicate material and waste thereof that the control hydro-thermal is synthesized: [SO
3]＞5%, [Al
2O
3]＞10%, [CaO]＞25%; To adopt synthetic aluminosilicate material and the waste thereof that obtains of conventional hydro-thermal to carry out dehydration reaction 0.5～10 hour at 100 ~ 170 ℃, the material that obtains and dehydrated gyp-mix grinding or be ground to particle diameter≤80 μ m respectively mix and namely obtain secondary ettringite type swelling agent.
Described aluminosilicate material is to be synthetic normal concrete or gas concrete and the waste thereof of hydro-thermal reaction of main raw material with flyash and gypsum.
The application of described secondary ettringite type swelling agent in mortar, concrete.
Described consumption is for to mix in mortar, the concrete with the amount equivalent replacement cement of weight percent 6%～10%.
Principle of the present invention is: select the effective constituent of producing swelling agent through degradation production list sulphur type aquation calcium sulphoaluminate (AFm) conduct of trithiophenol salt type aquation calcium sulphoaluminate (ettringite) in the hydraulic cementing materials after the pyroprocessing for use, add an amount of dehydrated gyp-material again, be mixed with secondary ettringite type swelling agent.According to the chemistry of cement principle, hydration reaction can take place in single sulphur type aquation calcium sulphoaluminate (AFm) again under the condition that has gypsum to exist, and generates secondary ettringite expansion crystal, and its hydrated product is the same with sulplo-aluminate type swelling agent hydrated product.Be incorporated in mortar, the concrete and can reduce concrete shrinkage crack, play the beneficial effect of compensate for shrinkage.
Beneficial effect
(1) the secondary ettringite type swelling agent of the present invention's preparation, after being incorporated in the cement concrete, hydration reaction can take place in single sulphur type aquation calcium sulphoaluminate (AFm) in the swelling agent again under the condition of gypsum abundance, form ettringite (C in the hardened cement concrete
3A3CaSO
432H
2O) expansion crystal produces 0.2～0.7MPa compressive pre-stress at inside concrete, and keeps 0～100 μ ε microdilatancy state, improves the inside concrete stressed condition, improves the resistance to cleavage of concrete structure; Simultaneously, form ettringite (C
3A3CaSO
432H
2O) the expansion crystal can stop up, be filled in the inside concrete pore seam, improves the concrete hole structure, reduces concrete shrinkage crack, improves anti-permeability performance and the endurance quality of concrete product.
(2) environmental friendliness.The employed raw material of secondary ettringite type swelling agent provided by the invention is hydraulic cementing materials and the waste residue of handling by through high-temperature activation thereof; the single sulphur type aquation calcium sulphoaluminate (AFm) and the vitriol that utilize wherein ettringite decomposition to produce are done swelling agent effective constituent; part replaces natural materialss such as calcareous material such as natural alumstone and gypsum; guaranteeing to produce under the prerequisite of expansion; realized refuse reclamation; turn waste into wealth; save resource; preserve the ecological environment; reduce the swelling agent production cost greatly; the environmental friendliness performance is superior, has good ecological.
(3) safe and reliable.Secondary ettringite type swelling agent provided by the invention is to adopt the aluminosilicate material that contains active single sulphur type aquation calcium sulphoaluminate (AFm), allocate that an amount of gypsum makes into, do not contain natural alumstone or fire alunite, so alkali content is low, can not produce any alkali evil to cement concrete.Secondary ettringite type swelling agent provided by the invention does not contain grog in addition, compares with normal concrete, and the concrete early water heat-transmission of mixing secondary ettringite type swelling agent provided by the invention is reduced, and reduces concrete early crack.
(4) easy to implement.The method for preparing swelling agent provided by the invention can replace the production technique of traditional high-temperature calcination grog, have technology simply, operate easily, be easy to promote and the plurality of advantages of suitability for industrialized production.
Embodiment
The present invention is by utilizing the ettringite degradation production list sulphur type aquation calcium sulphoaluminate of hydraulic cementing materials after pyroprocessing as the main component of secondary ettringite type swelling agent, mix an amount of vitriol composition such as dehydrated gyp-again, and the adjustment by each component of swelling agent, make secondary ettringite type swelling agent, for specific surface area greater than 200m
2The powder of/kg consists of, and in weight part: it is 60～95 parts that the hydraulicity that high-temperature activation is handled contains the aluminium glue gel material, and dehydrated gyp-is 5～40 parts; Wherein, by percentage to the quality, the scope of the following composition of control is: [SO
3] at 15%～35 %, [Al
2O
3] at 15 %～20 %, [CaO] at 35 %～55 %, MgO≤5%; Alkali content≤0.75%; Be used for being configured to mortar or the concrete of different expansion characters.The maximum characteristics of crossing through the high-temperature steam curing activation treatment of hydraulic cementing materials are wherein to be rich in active single sulphur type aquation calcium sulphoaluminate and SO
4 2-, when adding some exciting agent such as dehydrated gyp-, at Ca (OH)
2The higher middle hydration reaction that takes place of alkaline environment (cement slurry) of concentration generates a large amount of ettringite and produces expansion effect.
Concrete preparation method is: (1) will contain Al
2O
3Pozzolanic materials and calcareous material, gypsum and water are after stirring, be shaped to base substrate or balling-up, natural curing 1～28 day, in maintenance cellar for storing things in 80 ℃～90 ℃ dry heating curings 0.5～10 hour, be warming up to 100 ℃～170 ℃, constant temperature dewatered and the ettringite decomposition reaction in 0.5～10 hour, perhaps with the base substrate of forming or bead quiet stop 2～10 hours after, in 120 ℃～190 ℃ steam press maintenances 1～10 hour, dewatering more than 100 ℃ 0.5～10 hour again, perhaps aluminosilicate material and the waste thereof that hydro-thermal is synthesized dewatering more than 100 ℃ 0.5～10 hour; (2) carry out weighing by the above-mentioned materials of 60～95 weight parts and the dehydrated gyp-of 5～40 weight parts, send into homogenizing in the pneumatic blending machine after carrying out mix grinding then or being milled down to particle diameter≤80 μ m respectively, obtain specific surface area greater than 200m
2The powder of/kg is secondary ettringite type swelling agent.
Pozzolanic materials in the above-mentioned steps (1) is that pozzolanic materials is any one in flyash, coal gangue, natural volcanic ash, the powder ash air-entrained concrete; Described calcareous material is lime; Described gypsum is natural dihydrate gypsum, natural anhydrite, semi-hydrated gypsum, chemical gypsum (mainly being phosphogypsum dihydrate, desulfurated plaster and fluorgypsum) and waste gypsum; Described aluminosilicate material is through the hydro-thermal reaction of routine synthetic normal concrete or gas concrete and waste thereof by flyash and gypsum etc.The Composition Control of the base substrate of making or bead and aluminosilicate material exists: contain [SO
3]＞5%, [Al
2O
3]＞10%, [CaO]＞25%.Dehydrated gyp-is CaSO in the above-mentioned steps (2)
4II for natural anhydrite, chemical gypsum, waste gypsum get through the high-temperature calcination processing, can be carried out coarse crushing in advance and then be ground into the regulation particle diameter such as particle diameter≤80 μ m.Each Composition Control scope in the secondary ettringite type swelling agent of making: [SO
3] at 15%～35 %; [Al
2O
3] at 15 %～20 %; [CaO] is at 35 %～55 %; MgO is not more than 5%; Alkali content is not more than 0.75%.
The application of secondary ettringite type swelling agent of the present invention in mortar, concrete.
Secondary ettringite type swelling agent of the present invention, during use with volume 6%～10%(weight percent) be suitable, equivalent replaces cement and is incorporated in mortar, the concrete, can give mortar, concrete good working performance and endurance quality.With the expansive concrete that swelling agent provided by the invention is configured to, bleeding rate reduces, and workability is good; Shrinking percentage is little, and the early strength development is good, and later strength increases; Reduce in the early-age shrinkage crack, and resistance to cleavage and anti-permeability performance improve greatly, and endurance performance of concrete improves.Secondary ettringite type swelling agent provided by the invention can be used for following mortar, concrete construction, position: the anti-parting of the underground waterproof of subway, tunnel, civil air defense constructions and installations, Highrise buildings etc.; Rigid self-waterproof roofing, antiseepage screed, moistureproof screed etc.; The anchor of buildings last-cost joint, big bottom plate rear pouring tape, skeleton construction joint; Nothing between base angle bolt anchoring, support and the concrete foundation of mechanical means is shunk perfusion etc.Wherein the volume of general indemnity contraction is 6～8%, and the post-cast strip volume is 9～12%.
Embodiment 1: the preparation method of secondary ettringite type swelling agent
Below be all weight part
(1) take by weighing 12 parts in 20 parts in flyash, 5 parts in lime, 1 part in gypsum and water through mix stir after, be shaped to base substrate or balling-up, natural curing 1～28 day, in maintenance cellar for storing things in 80 ℃～90 ℃ dry heating curings 0.5～10 hour, be warming up to 100 ℃～170 ℃, constant temperature 0.5～10 hour dewaters and the ettringite decomposition reaction.Take by weighing 60 parts above-mentioned materials and 40 parts dehydrated gyp-again, send into homogenizing in the pneumatic blending machine behind the mix grinding, the powder of gained particle diameter≤80 μ m is secondary ettringite type swelling agent.
(2) take by weighing 12 parts in 20 parts of coal gangues, 5 parts in lime, 1 part in gypsum and water through mix stir after, be shaped to base substrate or balling-up, natural curing 0～28 day, in maintenance cellar for storing things in 80 ℃～90 ℃ dry heating curings 0.5～10 hour, be warming up to 100 ℃～170 ℃, constant temperature 0.5～10 hour dewaters and the ettringite decomposition reaction.Take by weighing 80 parts above-mentioned materials and 20 parts dehydrated gyp-again, send into homogenizing in the pneumatic blending machine after levigate respectively, the powder of gained particle diameter≤80 μ m is secondary ettringite type swelling agent.
(3) take by weighing 12 parts in 20 parts of natural volcanic ash, 5 parts in lime, 1 part in gypsum and water through mix stir after, be shaped to base substrate or balling-up, natural curing 0～28 day, in maintenance cellar for storing things in 80 ℃～90 ℃ dry heating curings 0.5～10 hour, be warming up to 100 ℃～170 ℃, constant temperature 0.5～10 hour.Take by weighing 95 parts above-mentioned materials and 5 parts dehydrated gyp-again, send into homogenizing in the pneumatic blending machine behind the mix grinding, the powder of gained particle diameter≤80 μ m is secondary ettringite type swelling agent.
(4) take by weighing 20 parts in flyash, 5 parts in lime, 1 part in gypsum and 12 parts of warps of water, after mix stirring, be shaped to base substrate or balling-up, with the base substrate of forming or bead quiet stop 2～10 hours after, in 120 ℃～190 ℃ steam press maintenances 1～10 hour, dewatering more than 100 ℃ 0.5～10 hour again.Take by weighing 60 parts of above-mentioned materialss and 40 parts of dehydrated gyp-s again, send into homogenizing in the pneumatic blending machine behind the mix grinding, the powder of gained particle diameter≤80 μ m is secondary ettringite type swelling agent.
(5) take by weighing 20 parts of coal gangues, 5 parts in lime, 1 part in gypsum and 12 parts of warps of water, after mix stirring, be shaped to base substrate or balling-up, with the base substrate of forming or bead quiet stop 2～10 hours after, in 120 ℃～190 ℃ steam press maintenances 1～10 hour, dewatering more than 100 ℃ 0.5～10 hour again.Take by weighing 80 parts of above-mentioned materialss and 20 parts of dehydrated gyp-s again, send into homogenizing in the pneumatic blending machine after levigate respectively, the powder of gained particle diameter≤80 μ m is secondary ettringite type swelling agent.
(6) take by weighing 20 parts of natural volcanic ash, 5 parts in lime, 1 part in gypsum and 12 parts of warps of water, after mixing stirring, be shaped to base substrate or balling-up, with the base substrate of forming or bead quiet stop 2～10 hours after, in 120 ℃～190 ℃ steam press maintenances 1～10 hour, dewatering more than 100 ℃ 0.5～10 hour again.Take by weighing 95 parts of above-mentioned materialss and 5 parts of dehydrated gyp-s, mix grinding or levigate respectively after send into homogenizing in the pneumatic blending machine, the powder of gained particle diameter≤80 μ m is secondary ettringite type swelling agent.
(7) hydro-thermal is synthetic powder ash air-entrained concrete waste is after dewatering 0.5～10 hour more than 100 ℃, take by weighing 60 parts, take by weighing 40 parts dehydrated gyp-again, mix grinding or levigate respectively after send into homogenizing in the pneumatic blending machine, the powder of gained particle diameter≤80 μ m is secondary ettringite type swelling agent.
(8) hydro-thermal is synthetic powder ash air-entrained concrete waste is after dewatering 0.5～10 hour more than 100 ℃, take by weighing 80 parts, take by weighing 20 parts dehydrated gyp-again, mix grinding or levigate respectively after send into homogenizing in the pneumatic blending machine, the powder of gained particle diameter≤80 μ m is secondary ettringite type swelling agent.
(9) hydro-thermal is synthetic powder ash air-entrained concrete waste takes by weighing 90 parts after dewatering 0.5～10 hour more than 100 ℃, take by weighing 10 parts dehydrated gyp-again, mix grinding or levigate respectively after send into homogenizing in the pneumatic blending machine, the gained specific surface area is greater than 200m
2The powder of/kg is secondary ettringite type swelling agent.
The application example of embodiment 2, secondary ettringite type swelling agent
(1) application of swelling agent of the present invention in gravity flowing levelling mortar
In the present embodiment, cement is P II 52.5; Fine sand, fineness modulus are 1.9; Thickening material is hydroxyethyl ether cellulose; Water reducer is the aliphatic water reducing agent of concrete admixture technology company limited of salt urban construction section; Swelling agent is secondary ettringite type swelling agent provided by the invention.
Adopt the cement-sand ratio of 1:1.5, the water cement ratio of 1:2.5, water reducer volume are 0.6% of cement quality, and the thickening material volume is 0.3 ‰ of cement quality, and dry powder secondary aluminite type swelling agent of the present invention mixes (in mix) with 6% equivalent cement quality.New mix gravity flowing levelling mortar performance is as follows: expanding degree of mobilization certainly is 28cm, and flowing down the time in the Ma Shi awl of outlet for 3cm * 3cm is 20s.The gravity flowing levelling mortar performance is as follows after the water storing conservation moulding: the early stage degree of free swelling of 7d is that 0.045%, 28d degree of free swelling is 0.08%.
(2) application of the present invention in normal concrete
In the following example, cement is PO42.5; Medium sand, fineness modulus are 2.6; Water reducer is the efficient retarding and water reducing agent of concrete admixture technology company limited of salt urban construction section, and swelling agent is secondary ettringite type swelling agent provided by the invention.
I: underplate concrete: (5～31.5mm) 1120kg, water 163kg, flyash 50kg, dry powder secondary aluminite type swelling agent of the present invention mixes (in mix) with 8% equivalent cement quality for cement 300kg, sand 708kg, rubble.Concrete index is as follows behind the mix: the slump is 200mm, 0.036%, 28 day limited expansion rate 0.079% of 7 days limited expansion rates; 7 days ultimate compression strength 36.5MPa, 28 days ultimate compression strength 44.3 MPa.
Ii: side wall concrete: (5～20mm) 1023kg, water 165kg, flyash 70kg, dry powder secondary aluminite type swelling agent of the present invention mixes with 10% equivalent cement quality for cement 370kg, sand 681kg, rubble.Concrete index is as follows behind the mix: the slump is 210mm, 0.042%, 28 day limited expansion rate 0.081% of 7 days limited expansion rates; 7 days ultimate compression strength 35.5MPa, 28 days ultimate compression strength 43.7MPa.
(3) application of the present invention in high volume fly ash concrete
In the following example, cement is P II 52.5; Medium sand, fineness modulus are 2.6; Cobble-stone diameter is 5～20mm; Water reducer is the polycarboxylate water-reducer of concrete admixture technology company limited of salt urban construction section; Swelling agent is secondary ettringite type swelling agent provided by the invention.
I: swelling agent of the present invention mixes (in mix) by cement quality 6%: cement 290kg, flyash 280kg, sand 800kg, stone 800kg, water 175kg, water reducer be cement quality 0.3%, swelling agent 18kg.The concrete index of correlation is as follows behind the mix: divergence is 750mm, 7d limited expansion rate 0.036%, 28d limited expansion rate 0.066%; 7 days ultimate compression strength 33MPa, 28 days ultimate compression strength 56MPa.
Ii: swelling agent of the present invention mixes by cement quality 8%: cement 290kg, flyash 280kg, sand 800kg, stone 800kg, water 175kg, water reducer be cement quality 0.3%, swelling agent 24kg.The concrete index of correlation is as follows behind the mix: divergence is 750mm, 0.045%, 28 day limited expansion rate 0.087% of 7 days limited expansion rates; 7 days ultimate compression strength 35MPa, 28 days ultimate compression strength 58MPa.
Claims (8)
1. a secondary ettringite type swelling agent is characterized in that the powder for particle diameter≤80 μ m consists of, and in weight part: it is 60～95 parts that the hydraulicity that high-temperature activation is handled contains the aluminium glue gel material, and dehydrated gyp-is 5～40 parts; Wherein, by percentage to the quality, the scope of the following composition of control is: [SO
3] 15%～35%, [Al
2O
3] 15%～20%, [CaO] 35%～55%, MgO≤5%; Alkali content≤0.75%; It is that aluminosilicate material is carried out dehydration reaction at 100～170 ℃ and obtained that the hydraulicity that described high-temperature activation is handled contains the aluminium glue gel material; The hydraulicity that described high-temperature activation is handled contains the particle diameter≤80 μ m of aluminium glue gel material and dehydrated gyp-, and described dehydrated gyp-is CaSO
4II is for any one high-temperature calcination processing through routine in natural anhydrite, chemical gypsum or the waste gypsum gets; To contain Al according to a conventional method
2O
3Pozzolanic materials and lime, gypsum and water after stirring, be shaped to base substrate or balling-up, by percentage to the quality, control following content: [SO
3]＞5%, [Al
2O
3]＞10%, [CaO]＞25%; Then, after the natural curing 1～28 day, in maintenance cellar for storing things in 80 ℃～90 ℃ dry heating curings 0.5～10 hour, be warming up to 100 ℃～170 ℃, constant temperature dewatered and the ettringite decomposition reaction in 0.5～10 hour, the material that obtains and dehydrated gyp-mix grinding or be ground to particle diameter≤80 μ m respectively mix namely.
2. prepare the method for the described secondary ettringite of claim 1 type swelling agent, it is characterized in that, will contain Al according to a conventional method
2O
3Pozzolanic materials and lime, gypsum and water after stirring, be shaped to base substrate or balling-up, by percentage to the quality, control following content: [SO
3]＞5%, [Al
2O
3]＞10%, [CaO]＞25%; Then, after the natural curing 1～28 day, in maintenance cellar for storing things in 80 ℃～90 ℃ dry heating curings 0.5～10 hour, be warming up to 100 ℃～170 ℃, constant temperature dewatered and the ettringite decomposition reaction in 0.5～10 hour, the material that obtains and dehydrated gyp-mix grinding or be ground to particle diameter≤80 μ m respectively mix and namely obtain secondary ettringite type swelling agent.
3. the method for preparing secondary ettringite type swelling agent as claimed in claim 2 is characterized in that, described pozzolanic materials is any one in flyash, coal gangue, the natural volcanic ash.
4. the method for preparing secondary ettringite type swelling agent as claimed in claim 2 is characterized in that, described gypsum is any one in natural dihydrate gypsum, natural anhydrite, semi-hydrated gypsum, phosphogypsum dihydrate, desulfurated plaster, fluorgypsum or the waste gypsum.
5. prepare the method for the described secondary ettringite of claim 1 type swelling agent, it is characterized in that, by percentage to the quality, in the aluminosilicate material and waste thereof that the control hydro-thermal is synthesized: [SO
3]＞5%, [Al
2O
3]＞10%, [CaO]＞25%; To adopt synthetic aluminosilicate material and the waste thereof that obtains of conventional hydro-thermal to carry out dehydration reaction 0.5～10 hour at 100～170 ℃, the material that obtains and dehydrated gyp-mix grinding or be ground to particle diameter≤80 μ m respectively mix and namely obtain secondary ettringite type swelling agent.
6. the method for preparing secondary ettringite type swelling agent as claimed in claim 5 is characterized in that, described aluminosilicate material is to be the synthetic normal concrete of hydro-thermal reaction of main raw material with flyash and gypsum.
7. the application of the described secondary ettringite of claim 1 type swelling agent in mortar, concrete.
8. the application of secondary ettringite type swelling agent as claimed in claim 7 in mortar, concrete, it is characterized in that, described secondary ettringite type swelling agent in mortar, concrete consumption for to mix in mortar, the concrete with the amount equivalent replacement cement of weight percent 6%～10%.
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| CN104140218B (en) * | 2014-01-15 | 2016-03-30 | 龚家玉 | The agent of a kind of the reinforcement of concrete waterproofing and anti-leakage |
| CN104529215B (en) * | 2014-12-17 | 2017-07-28 | 武汉三源特种建材有限责任公司 | A kind of ardealite swelling agent and preparation method thereof |
| CN105948551A (en) * | 2016-04-27 | 2016-09-21 | 中建商品混凝土西安有限公司 | Green reinforced composite type concrete expanding agent and preparation method thereof |
| CN113060949B (en) * | 2021-03-22 | 2022-07-22 | 北京工业大学 | Preparation method and application of gel material for prefabricated part based on crystal-to-gel ratio regulation and control |
| CN113185318B (en) * | 2021-06-07 | 2023-03-14 | 山东大学 | Steam-curing-free high-strength aerated concrete material and preparation method of aerated concrete |
| CN115466076B (en) * | 2022-09-06 | 2023-06-23 | 辽宁鹏硕科技有限公司 | Concrete ECI early crack inhibitor and preparation method thereof |
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| JP3206805B2 (en) * | 1997-07-24 | 2001-09-10 | 電気化学工業株式会社 | Admixture for shotcrete |
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