CN106746831B - A kind of waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist and preparation method thereof - Google Patents

A kind of waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist and preparation method thereof Download PDF

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Publication number
CN106746831B
CN106746831B CN201710110630.8A CN201710110630A CN106746831B CN 106746831 B CN106746831 B CN 106746831B CN 201710110630 A CN201710110630 A CN 201710110630A CN 106746831 B CN106746831 B CN 106746831B
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waste
old concrete
low temperature
heat treatment
micro mist
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CN106746831A (en
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黄修林
卞周宏
黄绍龙
彭波
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Hubei University
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Hubei University
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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
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/04—Heat treatment
    • 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 provides a kind of waste and old concrete Low Temperature Heat Treatment regeneration activity micro mists, it is formed using waste and old concrete Behavior of Hardened Cement Paste powder, mountain flour, sintering aid, desulfurized gypsum, exciting agent as raw material through grinding.The features such as regeneration activity micro mist is active high, particle size distribution is uniform, it can effectively improve the activity index of construction refuse regenerated active micro mist, improve concrete and mortar initial flow performance, reduce mobility gradual loss amount, concrete early strong mechanical property is improved, there is significant economical and environmentally friendly benefit.

Description

A kind of waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist and preparation method thereof
Technical field
The invention belongs to the field of building materials, and in particular to a kind of waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist and Preparation method.
Background technique
With the continuous quickening of China's urban construction process, extensional mode Real Estate Development Mode and large-scale reconstruction of the old city town So that the yield of China's building waste increases year by year, the 30-50% of municipal refuse total amount is accounted for.Simple extensive stacking, landfill Etc. processing modes not can effectively solve the status of the very fast growth of municipal refuse, while wasting natural resources and land resource.State Inside the technical way of recycling treatment building waste is generally broken at this stage and the preparation of grinding regeneration technology regenerates thickness Aggregate, regeneration activity micro mist and correlative regeneration concrete product, but there are also one for regenerated aggregate and quality of item and normal concrete Fixed gap, waste and old concrete resource conversion rate are lower.Contain Behavior of Hardened Cement Paste in waste and old concrete and mortar in building waste, lack Part sand and unhydrated cement can make the micro mist of recycling by effective technology means, are added to mortar and mix In solidifying soil, this method can effectively solve the simple stacking of waste and old concrete, realize construction refuse regenerated recycling.
But in traditional architecture rubbish in waste and old concrete treatment process, generally by waste and old concrete Mechanical Crushing Reach with grinding, so the crushers such as jaw crusher, hammer mill, kibbler roll will cause part in treatment process The building stones and sand being crushed are incorporated into building waste Behavior of Hardened Cement Paste (partial size is less than 4.75mm).Theoretically Behavior of Hardened Cement Paste is cement water The effective product changed, can achieve the ability of partially re-hydrated by appropriate process, but mixed part building stones and sand The activity that son will cause waste and old concrete regeneration activity micro mist reduces, and potential recycle value is insufficient, it is difficult to promote and apply.Together When, single Behavior of Hardened Cement Paste regeneration activity processing technique produces thermal excitation temperature and mechanical grinding manufacturing cost with higher, no The effects of energy saving and emission reduction advocated conducive to country.
Summary of the invention
To solve above-mentioned construction refuse regenerated active micro mist since part building stones and sand are active to regeneration activity micro mist Adverse effect, the present invention provides a kind of waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist, which has The features such as active high, particle size distribution is uniform, can effectively improve the activity index of construction refuse regenerated active micro mist, improve Concrete and mortar initial flow performance reduce mobility gradual loss amount, improve concrete early strong mechanical property, and be related to Preparation method is simple, low energy consumption, has significant economical and environmentally friendly benefit.
To achieve the above object, the technical solution adopted by the present invention are as follows:
A kind of waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist, it is with waste and old concrete Behavior of Hardened Cement Paste powder, mountain flour, burning Knot auxiliary agent, desulfurized gypsum, exciting agent are that raw material is formed through grinding, and wherein each component is calculated by weight as:
In above scheme, the waste and old concrete Behavior of Hardened Cement Paste powder is using waste and old concrete or waste and old mortar as raw material, first Primary fragmentation is carried out using crusher and obtains the regenerated coarse aggregate that partial size is less than 19mm, then carries out second-time breakage and obtain partial size being less than Then the recycled fine aggregate of 4.75mm carries out the powder that screening takes granularity to be less than 2.36mm to recycled fine aggregate, as described useless Old concrete Behavior of Hardened Cement Paste powder.
In above scheme, the mountain flour is the leftover pieces that stone material etc. generates in the process engineerings such as saw blade, cutting, grinding, SiO2Content is 70~95wt%, and partial size is less than 4.75mm.
In above scheme, the sintering aid is one of zinc sulfate, zinc carbonate, meta-sodium zincate or a variety of.
In above scheme, the desulfurized gypsum is desulfurized gesso of flue gas, CaSO4·2H2The mass content of O is greater than 90%, makes With front baking solid carbon dioxide point, 200 mesh screen residues are 5-8% (quality).
In above scheme, the exciting agent is modified alta-mud, polyoxyethylene sorbitan monostearate, alginic acid Sodium, soda ash, alkali lignin mixture, wherein each component mass percent are as follows: modified alta-mud 65-82%, polyoxyethylene Alcohol acid anhydride monostearate 4-12%, sodium alginate 6-10%, soda ash 2-8%, alkali lignin 5-14%.
In above scheme, the preparation step of the modified alta-mud are as follows: 1) by calcium-base bentonite, polyethylene glycol 200, to benzene Diphenol is added in reaction kettle, is warming up to 60-80 DEG C, mechanical stirring 5-10min, then butyl maleate is added dropwise and continues to stir 1- 2h keeps the temperature 0.5-1.0h；2) reaction product obtained by step 1) is condensed back and is filtered reaction, in 80-110 DEG C of drying 4- Obtained solid grind up to the modified alta-mud by 6h；Wherein calcium-base bentonite, polyethylene glycol 200, hydroquinone, The mass ratio of butyl maleate is 1:(0.5-2): (0.02-0.05): (0.8-1.5).
1) a kind of preparation method of above-mentioned waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist will include the following steps: Waste and old concrete Behavior of Hardened Cement Paste powder is mixed in proportion with mountain flour and sintering aid, carries out low temperature calcination processing (at Low Temperature Thermal Reason), 300-500 DEG C of calcination temperature, time 2-4h；It 2) will be through the powder and desulfurized gypsum and exciting agent after step 1) calcination processing Mixing carries out grinding processing, grinding time 1-3h, until less than 15%, specific surface area is 200 mesh screen residue of machine powder out in proportion 350-450m2/ kg is to get the waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist.
Technical principle of the invention are as follows:
1) by increasing powder activity waste and old concrete Behavior of Hardened Cement Paste powder Low Temperature Heat Treatment technology；Waste and old concrete Contain powdery fine aggregate in part in Behavior of Hardened Cement Paste powder, and in fine aggregate containing other non-Behavior of Hardened Cement Paste such as more silica at Point, silica can be improved by low temperature (300-500 DEG C) heat treatment process under the action of zinc compound sintering aid Grain surface alcohol radical activity, while low temperature heat treatment can be such that hydrated calcium silicate in Behavior of Hardened Cement Paste is dehydrated completely, interfacial transition zone The weak structure such as crack, porous is formed, is handled convenient for the grinding of waste and old concrete Behavior of Hardened Cement Paste powder；Low Temperature Heat Treatment can also be gone Except combustible organic in waste and old concrete Behavior of Hardened Cement Paste powder, powder moisture content is controlled, improves Behavior of Hardened Cement Paste powder and non-cement stone dust Expect whole activity.
2) waste and old concrete regenerative powder activity is improved by chemi-excitation and mechanical grinding complex technique；Through Low Temperature Thermal The waste and old concrete Behavior of Hardened Cement Paste powder Behavior of Hardened Cement Paste and aggregate of processing are since the difference of the coefficient of expansion forms more micro-crack, more It is handled added with grinding is conducive to；Waste and old concrete Behavior of Hardened Cement Paste powder and chemical activator (inorganic-organic exciting agent), desulfurized gypsum mix The Dispersion on surface effect of Behavior of Hardened Cement Paste powder is improved after conjunction grinding, the inorganic-organic exciting agent of use forms decentralized medium adherency In waste and old concrete Behavior of Hardened Cement Paste powder particle surface, grain shape and grain graininess index are more uniform, Behavior of Hardened Cement Paste and gather materials more Bonus point dissipates, while the activity of gained micro mist being made to obtain larger raising.
The invention has the benefit that
1) waste and old concrete Behavior of Hardened Cement Paste powder is carried out resource recycling by the present invention, efficiently solves existing concrete Or the universal relatively low problem of mortar regenerative micro powder activity, prepare the concrete and mortar regeneration activity micro mist of high activity, 7 Its activity index reaches 50%, and activity index reaches 80-110% within 28 days.
2) broken by level-one and tail over and two-stage crushing and tail over treatment process, realize waste and old concrete regenerated resources The comprehensive utilization changed can be used as regenerated coarse aggregate and prepare regenerative concrete products after level-one is broken and screening, after two-stage crushing Part can be used as recycled fine aggregate or prepare the raw material of regeneration activity micro mist, resource conversion rate is close to 100%.
3) mountain flour and desulfurized gesso of flue gas of the present invention are from a wealth of sources, cheap, and process and produce energy Consume low, economic benefit is obvious, and industry byproduct (mountain flour, desulfurized gypsum) is added in regeneration activity micro mist, regeneration is improved The working performance of active micro mist, while production cost is reduced, the new paragon of mountain flour regeneration has been explored, energy is significantly reduced Consumption and power consumption.
4) waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist produced by the invention can partially substitute cement, fine coal Ash, slag etc. use, and working performance of concrete, mechanical property and the endurance quality of preparation are effectively improved.
Specific embodiment
For a better understanding of the present invention, below with reference to the example content that the present invention is furture elucidated, but it is of the invention interior Appearance is not limited solely to the following examples.
In following embodiment, unless specific instructions, the reagent is commercially available chemical reagent or industrial products.
The waste and old concrete Behavior of Hardened Cement Paste powder carries out primary fragmentation using waste and old concrete as raw material, using jaw crusher Partial size is less than the regenerated coarse aggregate of 19mm, using hammer mill, by gained regenerated coarse aggregate progress second-time breakage, to obtain partial size small In the recycled fine aggregate of 4.75mm, screening then is carried out to recycled fine aggregate and takes powder of the granularity less than 2.36mm to get waste and old Concrete cement mountain flour material.
The desulfurized gypsum uses desulfurized gesso of flue gas, CaSO4·2H2The mass content of O is 94%, 200 mesh screen residues 7% (quality)；The granite powder that the mountain flour uses Macheng Hui Sen building materials Co., Ltd to provide, SiO2Content is 84wt%, is taken Partial size is less than 4.75mm.
The preparation step of the modified alta-mud are as follows: 1) be added to calcium-base bentonite, polyethylene glycol 200, hydroquinone In reaction kettle, 75 DEG C, mechanical stirring 8min are warming up to, then butyl maleate is added dropwise and continues to stir 2h, keeps the temperature 1h；Wherein calcium base Bentonite, polyethylene glycol 200, hydroquinone, butyl maleate mass ratio be 1:0.8:0.03:1.2；2) by step 1) institute It obtains reaction product and is condensed back and is filtered reaction, in 105 DEG C of drying 4h, obtained solid simply grind up to described Modified alta-mud.
Embodiment 1
A kind of waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist, it is by 100 parts by weight waste and old concrete cement stone dusts Material, 70 parts by weight mountain flours, 0.8 weight component sintering additive, 7 parts by weight desulfurized gypsums, 0.8 parts by weight exciting agent composition；Wherein swash It is pure by 72wt% modified alta-mud, 6wt% polyoxyethylene sorbitan monostearate, 8wt% sodium alginate, 5wt% to send out agent Alkali, alkali lignin 9wt% are mixed；Sintering aid is zinc sulfate.
The preparation step of the waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist are as follows: 1) take waste and old concrete or waste and old Mortar is raw material, carries out primary fragmentation using crusher first and obtains the regenerated coarse aggregate that partial size is less than 19mm, then is carried out secondary broken The broken recycled fine aggregate for obtaining partial size and being less than 4.75mm, then carries out the powder that screening takes granularity to be less than 2.36mm to recycled fine aggregate As waste and old concrete Behavior of Hardened Cement Paste powder；2) by waste and old concrete Behavior of Hardened Cement Paste powder obtained by step 1) and mountain flour and zinc sulfate press than Example is uniformly mixed, progress low temperature calcination processing, and 400 DEG C of calcination temperature, calcination time 3h；3) by the powder after step 2) calcination processing Material mixes in proportion with desulfurized gesso of flue gas and exciting agent and carries out grinding process processing, grinding 2h to 200 mesh screen residue of machine powder out Less than 15% (quality) to get the waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist.
Waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist manufactured in the present embodiment is subjected to activity test, the results showed that Its water demand ratio is 98%, and 28 days activity indexs are 93%, and fluidity ratio is 105%, full-automatic specific surface area measuring instrument measurement Specific surface area be 421m2/kg。
Embodiment 2
A kind of waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist, it is by 100 parts by weight waste and old concrete Behavior of Hardened Cement Paste Powder, 65 parts by weight mountain flours, 0.7 weight component sintering additive, 6 parts by weight desulfurized gypsums, 1.0 parts by weight exciting agents composition；Wherein Exciting agent is by 80wt% modified alta-mud, 4wt% polyoxyethylene sorbitan monostearate, 7wt% sodium alginate, 4wt% Soda ash, alkali lignin 5wt% composition；Sintering aid is zinc carbonate.
The preparation step of the waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist are as follows: 1) take waste and old concrete or waste and old Mortar is raw material, carries out primary fragmentation using crusher first and obtains the regenerated coarse aggregate that partial size is less than 19mm, then is carried out secondary broken The broken recycled fine aggregate for obtaining partial size and being less than 4.75mm, then carries out the powder that screening takes granularity to be less than 2.36mm to recycled fine aggregate As waste and old concrete Behavior of Hardened Cement Paste powder；2) by waste and old concrete Behavior of Hardened Cement Paste powder obtained by step 1) and mountain flour and zinc carbonate press than Example is uniformly mixed, progress low temperature calcination processing, and 430 DEG C of calcination temperature, calcination time 2.5h；It 3) will be after step 2) calcination processing Powder mixes in proportion with desulfurized gesso of flue gas and exciting agent and carries out grinding process processing, grinding 1.5h to 200 mesh of machine powder out It tails over less than 15% (quality) to get the waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist.
Waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist manufactured in the present embodiment is subjected to activity test, the results showed that Its water demand ratio is 100%, and 28 days activity indexs are 95%, and fluidity ratio is 92%, full-automatic specific surface area measuring instrument measurement Specific surface area be 436m2/kg。
Embodiment 3
A kind of waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist, it is by 100 parts by weight waste and old concrete Behavior of Hardened Cement Paste Powder, 60 parts by weight mountain flours, 0.6 weight component sintering additive, 8 parts by weight desulfurized gypsums, 1.2 parts by weight exciting agents composition；Wherein Exciting agent is by 68wt% modified alta-mud, 11wt% polyoxyethylene sorbitan monostearate, 9wt% sodium alginate, 2wt% Soda ash, alkali lignin 10wt% composition；Sintering aid is inclined Sodium Caprylate.
The preparation step of the waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist are as follows: 1) take waste and old concrete or waste and old Mortar is raw material, carries out primary fragmentation using crusher first and obtains the regenerated coarse aggregate that partial size is less than 19mm, then is carried out secondary broken The broken recycled fine aggregate for obtaining partial size and being less than 4.75mm, then carries out the powder that screening takes granularity to be less than 2.36mm to recycled fine aggregate As waste and old concrete Behavior of Hardened Cement Paste powder；2) waste and old concrete Behavior of Hardened Cement Paste powder obtained by step 1) and mountain flour and eccentric sour sodium are pressed Ratio is uniformly mixed, and is carried out low temperature calcination processing, 380 DEG C of calcination temperature, is calcined 2h to 200 mesh screen residue of machine powder out less than 15% (quality)；3) powder after step 2) calcination processing is mixed in proportion with desulfurized gesso of flue gas and exciting agent and carries out grinding process Processing, grinding time 1.5h is to get the waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist.
Waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist manufactured in the present embodiment is subjected to activity test, the results showed that Its water demand ratio is 99%, and 28 days activity indexs are 96%, and fluidity ratio is 95%, full-automatic specific surface area measuring instrument measurement Specific surface area is 442m2/kg。
Application examples and comparative example
Waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist prepared by embodiment 2 is applied to concrete batching, proportion It is shown in Table 1, by the common II grade of flyash of gained waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist replacing whole, performance test knot Fruit is shown in Table 2.
The cement is using the new PO42.5R cement of China；Flyash uses II grade of flyash of Wuhan Yangluo power plant production, Activity index 80%；Miberal powder uses Co., Ltd S95 grades of high perfermance cinder micro mist of Jiangnan grinding, activity index 105%；Rubble is 5-30mm continuous grading limestone gravel, crush values 7.9%, water absorption rate 1.8%；River sand is using sand in Dongting Lake, fineness modulus 2.8, clay content 0.8%；Water-reducing agent uses Wuhan Su Bote polycarboxylic acids high efficiency sustained-release water reducing agent.
Match ratio (the kg/m of concrete described in 1 application examples of table and comparative example3)
The performance test results of concrete obtained by 2 application examples of table and comparative example
The above results show: 28 days activity indexs of waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist of the present invention can To reach 95%, the initial fluidity of concrete can be improved by being applied in concrete, and have early strength height, shrinking percentage The features such as low, can replace flyash to use completely.
The foregoing is merely the preferred embodiment of the present invention, it is noted that comes for those of ordinary skill in the art It says, without departing from the concept of the premise of the invention, make several modifications and variations, these belong to protection model of the invention It encloses.

Claims (7)

1. a kind of waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist, which is characterized in that it is with waste and old concrete cement stone dust Material, mountain flour, sintering aid, desulfurized gypsum, exciting agent are that raw material is formed through grinding, and wherein each component is calculated by weight as:
The sintering aid is one of zinc sulfate, zinc carbonate, meta-sodium zincate or a variety of.
2. waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist according to claim 1, which is characterized in that described waste and old Concrete cement mountain flour material carries out primary fragmentation using crusher first and obtains partial size using waste and old concrete or waste and old mortar as raw material Regenerated coarse aggregate less than 19mm, then carry out second-time breakage and obtain the recycled fine aggregate that partial size is less than 4.75mm, it is then thin to regenerating Aggregate carries out the powder that screening takes granularity to be less than 2.36mm, as waste and old concrete Behavior of Hardened Cement Paste powder.
3. waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist according to claim 1, which is characterized in that the mountain flour For the leftover pieces generated in processing of stone engineering, wherein SiO2Content is 70~95wt%, and partial size is less than 4.75mm.
4. waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist according to claim 1, which is characterized in that the desulfurization Gypsum is desulfurized gesso of flue gas, CaSO4·2H2The mass content of O is greater than 90%, and 200 mesh screen residues are 5-8%.
5. waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist according to claim 1, which is characterized in that the excitation Agent is the mixture of modified alta-mud, polyoxyethylene sorbitan monostearate, sodium alginate, soda ash, alkali lignin, wherein respectively Mass percent shared by component are as follows: modified alta-mud 65-82%, polyoxyethylene sorbitan monostearate 4-12%, seaweed Sour sodium 6-10%, soda ash 2-8%, alkali lignin 5-14%.
6. waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist according to claim 5, which is characterized in that the modification Bentonitic preparation step are as follows:
1) calcium-base bentonite, polyethylene glycol 200, hydroquinone are warming up to 60-80 DEG C, mechanical stirring 5-10min, then horse is added dropwise Carry out sour mono-n-butylester to continue to stir 1-2h, keeps the temperature 0.5-1.0h；2) reaction product obtained by step 1) is condensed back and is filtered Obtained solid grind up to the modified alta-mud by reaction in 80-110 DEG C of drying 4-6h；Wherein calcium-base bentonite, Polyethylene glycol 200, hydroquinone, butyl maleate mass ratio be 1:(0.5-2): (0.02-0.05): (0.8-1.5).
7. the preparation method of the described in any item waste and old concrete Low Temperature Heat Treatment regeneration activity micro mists of claim 1~6, special Sign is, includes the following steps: 1) to mix in proportion waste and old concrete Behavior of Hardened Cement Paste powder, mountain flour and sintering aid, into Row calcination processing, calcination temperature are 300-500 DEG C, time 2-4h；2) will through after step 1) calcination processing powder and desulfurization Gypsum and exciting agent mix in proportion carries out grinding processing, until less than 15%, powder specific surface area is 200 mesh screen residue of machine powder out 350-450m2/ kg is to get the waste and old concrete Low Temperature Heat Treatment regeneration activity micro mist.
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