CN104310891B - A kind of environmental full regeneration concrete of nano-photo catalytic - Google Patents
A kind of environmental full regeneration concrete of nano-photo catalytic Download PDFInfo
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- CN104310891B CN104310891B CN201410543042.XA CN201410543042A CN104310891B CN 104310891 B CN104310891 B CN 104310891B CN 201410543042 A CN201410543042 A CN 201410543042A CN 104310891 B CN104310891 B CN 104310891B
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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 disclosure one full regeneration concrete of ecotype nano-photo catalytic, this concrete is prepared by each component of following weight portion, including cement 360～480 parts, loaded optic catalyst coarse aggregate 1000～1200 parts, fine aggregate 500～600 parts, supplementary cementitious material 40～90 parts, high efficiency water reducing agent 4～10 parts, 150～180 parts of water.Present invention have the advantage that the regenerated coarse aggregate, recycled fine aggregate and the regeneration concrete powder that utilize discarded concrete to produce, and use it for concrete preparation, achieving discarded concrete complete utilization truly and resource nil waste, ecological, environmental protective effect is obvious；And first passage load nano-photo catalytic component in regenerated coarse aggregate, it is achieved decomposing automobile exhaust, optimize atmospheric environment function.
Description
Technical field
The invention belongs to building material field, relate to a kind of environmental nano-photo catalytic entirely regenerate (by the regenerated coarse aggregate, recycled fine aggregate and the regenerative powder that obtain in discarded concrete disposal process all of) concrete.
Background technology
Along with the increase increasingly of infrastructure construction, tear old building open and new process will produce substantial amounts of discarded concrete, if not to its Appropriate application in addition, ecological environment will be had a strong impact on.In the disposal process of discarded concrete, regenerated coarse aggregate, recycled fine aggregate and regenerative powder can be obtained.At present generally prepare regeneration concrete only with regenerated coarse aggregate and recycled fine aggregate, thus cause cannot efficient resource utilization regenerative powder.Complete regeneration for realizing discarded concrete reaches environmental effect, it is necessary to regeneration aggregate and regenerative powder are carried out full regeneration.
In recent years, China's socio-economic development is swift and violent, and automobile pollution increases sharply, and the atmospheric pollution that vehicle exhaust causes has caused the concern of people.Major pollutants in vehicle exhaust include carbon monoxide (CO), Hydrocarbon (HC), oxynitride (NOx), sulfide, aldehyde and particulate matter etc., bring great negative effect to the health of people.Conventional pav material does not possess the function of decomposed tail gas, therefore need develop a kind of ground surface material with cleaning atmospheric pollution thing function.
Summary of the invention
The present invention is directed to the above-mentioned deficiency of prior art, it is provided that one can make full use of discarded concrete, energy-conserving and environment-protective, there is the full regeneration concrete of environmental nano-photo catalytic of cleaning atmospheric pollution thing function.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is: a kind of environmental full regeneration concrete of nano-photo catalytic, this concrete is prepared by each component of following weight portion, including cement 360～480 parts, loaded optic catalyst coarse aggregate 1000～1200 parts, fine aggregate 500～600 parts, supplementary cementitious material 40～90 parts, high efficiency water reducing agent 4～10 parts, 150～180 parts of water.
Loaded optic catalyst coarse aggregate of the present invention be by adopt discarded concrete to crush to make meet particle diameter 4.75～25mm continuous grading, crush index is less than 12%, robustness mass loss is less than 5% regenerated coarse aggregate is placed in photocatalyst and soaks 15-30h (preferred 24h), then take out, at 90～105 DEG C, be dried to constant weight and the loaded optic catalyst coarse aggregate that obtains.
Above-mentioned robustness mass loss industry is defined as general sand, cobble and rubble etc. and resists, under weathering and other extraneous physical chemical factor effects, the ability broken.Checking by metabisulfite solution method, sample its weight loss values after 5 times circulate should be less than pertinent regulations, the such as present invention above-mentioned mass loss regulation less than 5%.
Fine aggregate of the present invention be adopt discarded concrete crush make meet particle diameter be more than or equal to 0.075mm and less than the recycled fine aggregate of 4.75mm, II district grating (II district graded soil wood engineering industry conventional designation).
The above-mentioned restriction for coarse aggregate and the specification of fine aggregate of the present invention, the restriction such as particle diameter is the regulation divided for thick, fine aggregate in civil engineering；And the regulation for crush values etc. is mainly the mechanical property considering regenerated coarse aggregate, if the indexs such as the crush values of regenerated coarse aggregate are too low, then the concrete strength prepared cannot be guaranteed.
Supplementary cementitious material of the present invention is composite regenerated concrete powder, and it is attach the particle diameter the formed regenerative powder less than 0.075mm in regeneration aggregate production process through (in the present invention, slag powders and regenerative powder respectively account for 50% with slag powders；Why directly do not adopt regenerative powder, the pozzolanic activity that reason is regenerative powder is relatively low, concrete physical and mechanical property can be had a negative impact, and with slag powders compound after, a kind of supplementary cementitious material with pozzolanic activity can be changed into, thus concrete long-term behaviour is produced advantageous effect) the levigate powder body of compound, meet 45 μm tail over≤3.0%, water demand ratio≤105%, loss on ignition≤8.0,28d activity index >=90%.Limiting in order that make the performance of supplementary cementitious material meet prepare concrete requirement of above-mentioned composite regenerated concrete powder specification；Such as: water demand ratio is excessive, causing that concrete strength reduces, activity index is too small, then show that supplementary cementitious material pozzolanic activity is relatively low, later stage mechanical property is had a negative impact.
Water reducer of the present invention is the water-reducing rate high-efficiency water-reducing agent of poly-carboxylic acid (all adapting to the present invention as Wuhu Fa Er wins the TOJ800-10 polycarboxylate water-reducer of Science and Technology Ltd.'s production, TOJ800-4 polycarboxylate water-reducer, TOJ800-2 polycarboxylate water-reducer etc.) more than 25% or naphthalene series high-efficiency water-reducing agent (naphthalene series high-efficiency water-reducing agent if Wanshan Mountain Chemical Co., Ltd. product is β naphthalenesulfonic acid-formaldehyde condensate).
Photocatalyst of the present invention is nano titanium oxide dispersion (can be the transparent dispersion liquid of nano titanium oxide herein, it is to adopt international advanced dispersing technology, nano-titanium dioxide powder (5-15nm) is disperseed in an aqueous medium, form the transparent dispersion liquid of nanometer titanium dioxide water of high degree of dispersion, homogenization and stabilisation, direct commercially available prod), anatase titanium dioxide, titanium dioxide powder particle diameter 5 nanometers-15 nanometers, concentration is 5g/L.
The concrete preparation method of the present invention above-mentioned " a kind of environmental full regeneration concrete of nano-photo catalytic " is:
(1) first waste concrete block is crushed, obtain after screening particle diameter, grating and physical property meet in formula require regenerated coarse aggregate after, this regenerated coarse aggregate is soaked in photocatalyst 15-30h, takes out, at 90～105 DEG C, be dried to constant weight；And then remaining granule is sieved, obtain particle diameter and meet, with grating, the recycled fine aggregate required in above-mentioned formula；Finally by levigate to remaining regenerative powder and slag powders compound, obtain performance indications and meet the composite regenerated concrete powder required in formula；
(2) each raw material is weighed by formula proportion, first the water of the 50% of loaded optic catalyst coarse aggregate, fine aggregate and formula total water consumption is stirred 25-35s, it is subsequently adding cement and supplementary cementitious material is stirred for 25-35s and obtains compound, stirring in above-mentioned compound, the full regeneration concrete of environmental nano-photo catalytic that namely stirring 45-60s obtains is added after finally high efficiency water reducing agent being distributed in remaining 50% water.
Containing Ca (OH) in the regeneration concrete powder of the present invention2, slag powders is the mineral admixture that a kind of activity is significantly high, and it is at alkali-activator Ca (OH)2Effect under, the hydrated products such as C-S-H gel can be generated.Regeneration concrete powder and the levigate system of slag powders compound are clearly advantageous to exciting of mineral admixture activity, give full play to its pozzolanic activity.
The regenerated coarse aggregate of the present invention is porous mass, be soaked in nano-photocatalyst can abundant load photocatalysis component, use it for concrete preparation, it is achieved the function of photocatalytic degradation car exhaust gas.
The environmental full regeneration concrete of nano-photo catalytic of the present invention, the ecotype refers to that discarded concrete is fully used, not influence ecological environment；Full regeneration refers to that discarded concrete has all been processed into regenerated coarse aggregate, recycled fine aggregate and regenerative powder, it is achieved that full regeneration；Nano-photo catalytic concrete refers to and is loaded with nano-photo catalytic component in concrete, makes concrete have the function realizing decomposing automobile exhaust, optimizing atmospheric environment.
The present invention compared with prior art, has performance and the advantage of following uniqueness:
(1) utilize regenerated coarse aggregate, recycled fine aggregate and regeneration concrete powder that discarded concrete produces, and use it for concrete preparation, it is achieved that discarded concrete complete utilization truly and resource nil waste, ecological, environmental protective effect is obvious.
(2) first passage of the present invention load nano-photo catalytic component in regenerated coarse aggregate, it is achieved decomposing automobile exhaust, optimize atmospheric environment function.
(3) present invention is compared to other ground surface material of similar performance, and the maximum advantage of the present invention is economic and environment-friendly, stable and controllable for quality, meets the ecological ideas development that country advocates.
Accompanying drawing explanation
The accompanying drawing present invention is through the broken and sieving technology of discarded concrete coarse aggregate and fine aggregate and regenerative powder etc..
Detailed description of the invention
The present invention is described in further detail by the examples below, but the present invention is not limited solely to following example.
The discarded concrete of the present invention through repeatedly crushing and after screening, need to respectively obtain regenerated coarse aggregate, recycled fine aggregate and regenerative powder.For industry common process, concrete technology flow chart is shown in shown in accompanying drawing.
Embodiment 1
Calculation by weight, each raw material components of the present embodiment concrete is as follows: include cement 370 parts, loaded optic catalyst coarse aggregate 1172 parts, fine aggregate 578 parts, supplementary cementitious material 50 parts, naphthalene series high-efficiency water-reducing agent 4 parts, 150 parts of water.
Preparation process is: first waste concrete block is crushed by (1), obtain after screening particle diameter, grating and physical property meet in above-mentioned formula require regenerated coarse aggregate after, this regenerated coarse aggregate is soaked in photocatalyst 24h, takes out, at 90～105 DEG C, be dried to constant weight；And then remaining granule is sieved, obtain particle diameter and meet, with grating, the recycled fine aggregate required in above-mentioned formula；Finally by levigate to remaining regeneration concrete powder and slag powders compound, obtain performance indications and meet the supplementary cementitious material required in above-mentioned formula.
(2) each raw material is weighed by formula proportion, first the water of the 50% of regenerated coarse aggregate, recycled fine aggregate and formula total water consumption is stirred 30s, it is subsequently adding cement and supplementary cementitious material is stirred for 30s, finally polycarboxylate water-reducer being distributed in remaining 50% water to add, namely stirring 50s obtains the above-mentioned full regeneration concrete of environmental nano-photo catalytic.
The technical specification of the full regeneration concrete of environmental nano-photo catalytic prepared by the present embodiment: 28d comprcssive strength is 38.6MPa, 28d flexural tensile strength is 3.5MPa, meets ground surface material mechanical property requirements.This concrete, under simulating sun optical condition, continues through the NO that concentration is 30ppm2Testing, photocatalysis rate reaches 78.1%.
Embodiment 2
Calculation by weight, including cement 425 parts, loaded optic catalyst coarse aggregate 1113 parts, fine aggregate 552 parts, supplementary cementitious material 75 parts, naphthalene series high-efficiency water-reducing agent 5 parts, 165 parts of water.
Preparation method is with embodiment 1.
The technical specification of the full regeneration concrete of environmental nano-photo catalytic prepared by the present embodiment: 28d comprcssive strength is 45.8MPa, 28d flexural tensile strength is 4.6MPa, meets ground surface material mechanical property requirements.This concrete, under simulating sun optical condition, continues through the NO that concentration is 30ppm2Testing, photocatalysis rate reaches 72.2%.
Embodiment 3
Calculation by weight, including cement 465 parts, loaded optic catalyst coarse aggregate 1085 parts, fine aggregate 565 parts, supplementary cementitious material 85 parts, high-efficiency water-reducing agent of poly-carboxylic acid 8 parts, 165 parts of water.
Preparation method is with embodiment 1.
The technical specification of the full regeneration concrete of environmental nano-photo catalytic prepared by the present embodiment: 28d comprcssive strength is 58.8MPa, 28d flexural tensile strength is 5.6MPa, meets ground surface material mechanical property requirements.This concrete, under simulating sun optical condition, continues through the NO that concentration is 30ppm2Testing, photocatalysis rate reaches 69.6%.
Claims (5)
1. the full regeneration concrete of environmental nano-photo catalytic, it is characterized in that: this concrete is prepared by each component of following weight portion: cement 360 ~ 480 parts, loaded optic catalyst coarse aggregate 1000 ~ 1200 parts, fine aggregate 500 ~ 600 parts, supplementary cementitious material 40 ~ 90 parts, high efficiency water reducing agent 4 ~ 10 parts, 150 ~ 180 parts of water；
Described loaded optic catalyst coarse aggregate be by adopt discarded concrete to crush to make meet particle diameter 4.75 ~ 25mm continuous grading, crush index is less than 12%, robustness mass loss is less than 5% regenerated coarse aggregate is placed in photocatalyst immersion 15-30h, then take out, at 90 ~ 105 DEG C, be dried to constant weight and the loaded optic catalyst coarse aggregate that obtains；Described fine aggregate be adopt discarded concrete crush make meet particle diameter be more than or equal to 0.075mm and less than the recycled fine aggregate of 4.75mm, II district grating；Described supplementary cementitious material is composite regenerated concrete powder, it is the particle diameter formed subsidiary in the regeneration aggregate production process regenerative powder less than the 0.075mm powder body levigate with slag powders compound, this composite regenerated concrete powder meet 45 μm tail over≤3.0%, water demand ratio≤105%, loss on ignition≤8.0%, 28d activity index >=90%.
2. the environmental full regeneration concrete of nano-photo catalytic according to claim 1, it is characterised in that: described photocatalyst is nano titanium oxide dispersion, anatase titanium dioxide, titanium dioxide powder particle diameter 5 nanometers-15 nanometers, and concentration is 5g/L.
3. the environmental full regeneration concrete of nano-photo catalytic according to claim 1, it is characterised in that: in described composite regenerated concrete powder wherein regeneration aggregate production process, the subsidiary particle diameter the formed regenerative powder less than 0.075mm is 1:1 with the weight ratio of slag powders.
4. the environmental full regeneration concrete of nano-photo catalytic according to claim 1, it is characterised in that: described water reducer is the water-reducing rate high-efficiency water-reducing agent of poly-carboxylic acid more than 25% or naphthalene series high-efficiency water-reducing agent.
5. the preparation method of the environmental full regeneration concrete of nano-photo catalytic according to claim 1, it is characterised in that: step includes:
(1) first waste concrete block is crushed, obtain after screening particle diameter, grating and physical property meet in formula require regenerated coarse aggregate after, this regenerated coarse aggregate is soaked in photocatalyst 15-30h, taking-up, at 90 ~ 105 DEG C, be dried to constant weight；And then remaining granule is sieved, obtain particle diameter and meet, with grating, the recycled fine aggregate required in above-mentioned formula；Finally by levigate to remaining regenerative powder and slag powders compound, obtain performance indications and meet the composite regenerated concrete powder required in formula；
(2) each raw material is weighed by formula proportion, first the water of the 50% of loaded optic catalyst coarse aggregate, fine aggregate and formula total water consumption is stirred 25-35s, it is subsequently adding cement and supplementary cementitious material is stirred for 25-35s and obtains compound, stirring in above-mentioned compound, the full regeneration concrete of environmental nano-photo catalytic that namely stirring 45-60s obtains is added after finally high efficiency water reducing agent being distributed in remaining 50% water.
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| CN104944863A (en) * | 2015-06-12 | 2015-09-30 | 中建商品混凝土西安有限公司 | Preparation method for high-strength self-compacting concrete with recycled fine aggregate |
| CN106220102A (en) * | 2016-08-15 | 2016-12-14 | 马鞍山十七冶工程科技有限责任公司 | A kind of colored automatically cleaning self-compacting concrete and preparation method |
| CN108585690A (en) * | 2018-04-27 | 2018-09-28 | 哈尔滨工程大学 | A kind of high efficiency photocatalysis cement-based material and its application process |
| CN109503087A (en) * | 2018-12-29 | 2019-03-22 | 浙江大学 | A kind of self-supported nano-TiO2Modification regeneration water-permeable brick and preparation method thereof |
| CN110194606A (en) * | 2019-06-20 | 2019-09-03 | 中建西部建设新疆有限公司 | A kind of preparation method of Photocatalytic Regeneration micro mist, concrete material and preparation method |
| CN111056794B (en) * | 2019-12-17 | 2021-11-30 | 深圳市恒星建材有限公司 | Ecological nano photocatalytic recycled concrete and preparation method thereof |
| CN112047679B (en) * | 2020-08-19 | 2022-04-26 | 南通市展成商品混凝土有限公司 | Recycled concrete and preparation method thereof |
| CN112281570B (en) * | 2020-12-29 | 2021-05-14 | 山东交通学院 | Pavement structure with photocatalytic purification function and construction method |
| CN113233833B (en) * | 2021-01-22 | 2022-10-11 | 浙江省二建建设集团有限公司 | Preparation method of recycled aggregate colorful bare concrete hanging plate with self-cleaning function |
| EP4155277A1 (en) * | 2021-09-23 | 2023-03-29 | HeidelbergCement AG | Method for manufacturing a supplementary cementitious material |
| CN114149228A (en) * | 2021-12-20 | 2022-03-08 | 饶平县新才建材有限公司 | Environment-friendly recycled concrete |
| CN114380556B (en) * | 2022-01-26 | 2022-10-25 | 同济大学 | Concrete preparation and used aggregate treatment method considering future convenience for cyclic regeneration |
| CN115611558B (en) * | 2022-09-13 | 2023-08-22 | 安徽师范大学 | Preparation method of three-dimensional ecological concrete and application of three-dimensional ecological concrete in black and odorous water body treatment |
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