CN104310880A - Method for improving freeze-thaw resistance of concrete by using waste incineration fly ash pre-treated by washing - Google Patents
Method for improving freeze-thaw resistance of concrete by using waste incineration fly ash pre-treated by washing Download PDFInfo
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- CN104310880A CN104310880A CN201410514111.4A CN201410514111A CN104310880A CN 104310880 A CN104310880 A CN 104310880A CN 201410514111 A CN201410514111 A CN 201410514111A CN 104310880 A CN104310880 A CN 104310880A
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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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Abstract
The invention discloses a method for improving freeze-thaw resistance of concrete by using waste incineration fly ash pre-treated by washing. Cement, coal ash, sands, stones and water are used for preparing concrete. The method is characterized in that 5-20% by mass of cement is replaced by waste incineration fly ash pre-treated by washing. The method can be used for effectively improving the freeze-thaw resistance of concrete and guaranteeing that concrete has good mechanical property and meanwhile can be used for effectively immobilizing residual harmful heavy metal ions in waste incineration fly ash pre-treated by washing, so that heavy metal ions are not easily leached after the prepared concrete is subjected to freeze-thaw damage, thereby satisfying the associated safety standard of China. According to the method disclosed by the invention, urban waste incineration fly ash is reused, so that the method meets the strategy of sustainable development for resource regeneration of China and has relatively high social and economic benefits.
Description
Technical field
The invention belongs to building material technical field, be specifically related to a kind of method utilizing water-washing pre-treatment incineration of refuse flyash to improve agent on crack resistance of concrete freeze thawing performance.
Background technology
Concrete weather resistance refers to its opposing surrounding medium effect and the good use properties of long-term maintenance and complete appearance, thus maintains the ability of safe, the normal use of concrete structure.Wherein, the destruction that concrete produces because of freeze-thaw cycle under water-saturated state is called freeze-thaw damage, and concrete Frost Resistance (abbreviation frost resistance) namely refers to the performance of full water coagulation soil opposing freeze-thaw cycle effect.Concrete is in water-saturated state and freeze-thaw cycle alternating action is the prerequisite that concrete through freeze-thaw test occurs, therefore, concrete freeze-thaw damage generally betides the concrete structure that cold district often contacts with water, as the extra large work in change of level district, Hydro-concrete Structures thing and road, buildings plinth, balcony etc. with water contact site.In China northeast, the water resources dam of North China and the Northwest, the especially concrete structure of severe cold area, northeast, almost 100% engineering local or suffer in various degree in large area freeze-thaw damage.The destruction that concrete freeze-thaw cycle produces mainly contains frost heave cracking and surface deterioration two aspects, water icing frost heave cracking caused in concrete pore makes the mechanical property degradations such as concrete Young's modulus, ultimate compression strength, tensile strength, the wearing quality of Damage Structure thing, therefore in order to improve the endurance quality of concrete structure, ensure the safety of people's property and the person, improve the energy environment level of resources utilization, research improves concrete frost resistance meaning of crucial importance.
Under normal circumstances, concrete freeze-thaw damage is an extremely complicated physical change process, and by being permitted multifactorial impact.(such as: the number of times etc. of the Water filling degree of concrete mesoporosity, water cement ratio, cement type and aggregate quality, air content, envrionment temperature and multigelation.) therefore, the mechanism for concrete through freeze-thaw test is difficult to draw conforming final conclusion, mainly contains following representative theories: the separating layer of ice is theoretical, water filling coefficient is theoretical, theory of osmotic pressure, water pressure theoretical, pore structure is theoretical.Above-mentioned several theory has set forth the mechanism of concrete through freeze-thaw test from different perspectives, although these theories are also disagreed each other, generally can think concrete freeze-thaw damage be one from outward appearance to inner essence, the physical change process of aperture after first macropore.Because water build-ups ice generation volumetric expansion, in concrete, form internal pressure, when this internal pressure exceedes the limit that concrete can bear, cause inside concrete hole and crack constantly to grow, change from small to big, by short elongated, mutually through, finally cause concrete destruction.
The method of traditional raising concrete frost resistance mainly contains: strictly control water cement ratio, add air entrapment agent, mix appropriate high-quality mineral admixture and adopt resin impregnation concrete four kinds.But these methods all inevitably improve concrete production cost, consume more natural resources.
Flying ash primary chemical composition is SiO
2, CaO, Al
2o
3and Fe
2o
3, with the adulterant such as blast-furnace slag, flyash widely applied at present closely, and have certain activity, thus the secondary reaction product of aquation later stage flying dust is filled with the comparatively macrovoid of cement; On the other hand, fly ash granule particle diameter is comparatively thin, makes it can play the effect of certain filling minute aperture in concrete.Thus mix the aperture refinement that flying dust can make inside concrete in concrete, reduce freezing point, thus can effectively improve concrete anti-freezing property.
Summary of the invention
The object of the invention is to propose a kind of method that Appropriate application water-washing pre-treatment incineration of refuse flyash improves concrete antifreezing performance.
The present invention utilizes water-washing pre-treatment incineration of refuse flyash to improve the method for agent on crack resistance of concrete freeze thawing performance, its technical scheme is: with cement, flyash, sand, stone and water concrete batching, it is characterized in that, substitute the cement of 5-20% massfraction with the incineration of refuse flyash through water-washing pre-treatment.
The described composition of the incineration of refuse flyash primary chemical through water-washing pre-treatment is SiO
2, CaO, Al
2o
3and Fe
2o
3, and make the Leaching of flying dust lower than standard GB/T 5085.3-2007 " Hazardous wastes judging standard leaching characteristic identification " by water-washing pre-treatment.The described incineration of refuse flyash particle diameter through water-washing pre-treatment concentrates on 3-55 μm.
Preferably, the mass ratio of flyash and cement is 17-20%.
Preferably, the admixture that quality is the 0.5-1% of cement is also added with in the concrete prepared.Described admixture is mainly water reducer.
The present invention utilizes water-washing pre-treatment incineration of refuse flyash to replace part of cement, and be equipped with the material such as flyash and admixture and carry out composite modified, under the prerequisite ensureing mechanical performance of concrete, the concrete anti-freezing property of effective raising, and make the heavy metal ion of concrete after suffering freeze-thaw damage leach the environmental safety standard meeting country and be correlated with.The present invention is not only China garbage flying ash and disposes and open a new outlet, effectively process waste, improve urban environment, save land resources, also the building trade huge for energy consumption is provided the road of an environmental protection simultaneously, the management being conducive to promoting national incineration of refuse flyash, to " zero landfill ", " being free from risk " future development, has huge social and economic effects.
Accompanying drawing explanation
Fig. 1 is different shapes fly ash granule SEM image.
Embodiment
The fundamental property of water-washing pre-treatment incineration of refuse flyash used in the present invention
The present invention's incineration of refuse flyash former state used takes from Shanghai Pudong New Area Yu Qiao municipal solid waste incinerator, collected by incinerator dust-precipitator, after water-washing pre-treatment, be crushed to below granularity 5mm by PEF 60 × 100 jaw crusher, drop into Φ 500mm × L500mm test grinding machine grinding obtained after 20 minutes.Main chemical compositions before and after water-washing pre-treatment and heavy metal content are respectively in table 1, table 2.
Main chemical compositions before and after table 1 incinerator ash water-washing pre-treatment
Front and back incinerating flyash, heavy metal content/(mg/kg) washed by table 2
The microscopic appearance of water-washing pre-treatment flying ash as shown in Figure 1, can be summarized as spheroplast (a, b), atactic polymer (c, d), flock (e) and bar-shaped (f) from morphological specificity.
Table 3 is particle size distribution of water-washing pre-treatment incineration of refuse flyash used in the present invention.
The size-grade distribution of table 3 water-washing pre-treatment flying dust
Table 4 is the specific surface area of water-washing pre-treatment incineration of refuse flyash used in the present invention and the screen over-size of 80um.
Table 4 water-washing pre-treatment flying ash fineness
As can be seen from above-mentioned data, the present invention's flying dust used through water-washing pre-treatment with effectively after grinding, its Cl
-greatly reduce with heavy metal content, this makes its maximum doping quantity in concrete significantly improve.In addition the grain diameter washing and grind rear flying dust is comparatively thin and be evenly distributed, major part concentrates between 3-55um, particle diameter account for 75% at the particle of below 30um, particle diameter account for 90% at the particle of below 55um, mix in concrete and can play corresponding filling and secondary hydration effect, improve concrete freezing tolerance.
Embodiment
Table 5 is three kinds of concrete proportionings as a reference, the amount of the flying ash of admixture with the quality of cement for benchmark.
Pre-treatment washing flying ash frost thawing resistance concrete proportioning mixed by table 5
Regulation according in GB/T 175-2007 " general purpose portland cement " and GB 50164-2011 " Standard for quality control of concrete ": in plain concrete, Steel Concrete, prestressed concrete, Water soluble chloride ion limit value is respectively Cl
-≤ 1%, Cl
-≤ 0.3%, Cl
-≤ 0.06%.According to calculating, owing to washing the Cl in rear flying dust
-content greatly reduces, and the most high additive of water-washing pre-treatment flying ash can reach 20% of cement, therefore, allly all meets the peak demand of country to Chloride Ion in Concrete content with reference to proportioning above.
With reference to the concrete anti-freezing property of proportioning
The experiment of concrete freeze-thaw-measures according to " the quick-freeze method " in GB/T 50082-2009, and this standard specifies that the standard that test specimen reaches destruction and termination test is: reached 300 circulations, just can termination test; Relative dynamic elastic modulus drop to less than 60% or mass loss rate reach 5%, namely show that test specimen is damaged by frost.
Freezing and thawing test the results are shown in Table 6 and table 7.
Table 6 concrete antifreezing performance (mass loss rate) test result
Table 7 concrete antifreezing performance (relative dynamic elastic modulus) test result
From above-mentioned data, after mixing a certain amount of water-washing pre-treatment flying ash, concrete anti-freezing property is all greatly increased compared to benchmark group, its relative dynamic elastic modulus and mass loss rate are all lower than benchmark group, because itself and answering of flyash mix synergistic effect, concrete intensity not quite even can improve early strength to a certain extent compared to benchmark group difference, therefore, can think that flyash and water-washing pre-treatment incineration of refuse flyash are mixing its filling effect and secondary hydration effect Be very effective in situation again, the water-washing pre-treatment flying ash that utilizes proposed in visible the present invention is highly effective to improve concrete anti-freezing property.
Concrete is with reference to the concrete fundamental property of proportioning
Table 8, table 9 are respectively with reference to the concrete just final setting time of proportioning and the slump and slump retention value, due in flying dust containing the material that can promote hydrated cementitious, hydration rate is accelerated, thus corresponding shortening time of coagulation; Equally, the concrete slump can decrease along with the increase of flying dust volume.But two kinds of effects are just comparatively obvious more than only when volume is higher.Therefore, in actual use, the consumption suitably improving water reducer is needed when water-washing pre-treatment flying ash volume is higher.
Table 8 concrete is first, final setting time
Table 9 concrete slump and slump retention value/mm
Table 10 is three kinds of concrete mechanical properties of reference proportioning, as can be seen from the table, little compared to the difference of benchmark group with reference to the concrete early strength of proportioning, this is mainly due to mixing along with washing flying dust, early stage in aquation, although cement content reduces, cause C in system
3s, C
2s, C
3the minimizing of the mineral such as A, but a small amount of washing flying dust can promote the heat evolution velocity of cement to a certain extent, and therefore early strength is more or less the same.And it is active owing to itself having certain later stage in the aquation later stage, and particle wants thin many compared with cement granules, the hydrated product and unhydrated particles filled in the gap of hydrated cementitious resultant that flying dust hydration reaction increases, make concrete more closely knit, this is favourable to the development of concrete later strength, although therefore the content of cement reduces, concrete intensity is little compared to the change of benchmark group, can improve concrete early strength even to a certain extent.
Table 10 concrete crushing strength/MPa
As can be seen from the above data, method proposed by the invention can also ensure that it has good serviceability and mechanical property while raising frost-resistant concrete anti-freezing property.
With reference to the safety assessment of proportioning concrete Leaching of Heavy Metals concentration after freeze thawing
Usual cement-based material is very outstanding to the heavy metals immobilization ability in flying ash, the leaching regulation that country is relevant can be met, this is because concrete main hydration products is C-S-H gel, so when using cement to be cured incineration of refuse flyash, some heavy metals in flying ash, in cement hydration process, form the salt of calcic together with silicate or replace Ca
2+enter in C-S-H gel and confined, reduce its mobility in aqueous phase, Leaching Heavy Metals is reduced greatly, in addition, the present invention is after mixing flyash, mix synergistic effect by itself and answering of washing flying dust filling effect and pozzolanic reaction are enhanced, create more C-S-H gel and impel inside concrete pore structure more closely knit, thus further increasing the ability to cure of concrete heavy metal element.
But, due to the impact of the special Service Environment of frost thawing resistance concrete, after sample stands freeze thawing, the adsorptive power of hydrated calcium silicate gel heavy metal may weaken thus increase the risk of Leaching of Heavy Metals, so must ensure that cement and material still can ensure good metal-cured ability when being subject to freeze thawing.Therefore investigated further cement-based material after 100 freeze-thaw cycle in cement paste test block heavy metal surface leach situation, pre-treatment flying dust is pressed cement quality 10% respectively, 20%, 30%, 40% mix (is denoted as Bx than making cement paste test block, x is volume) test block loads 1000ml polyethylene bottle in 28 days by maintenance, 800ml deionized water is added by 10:1 liquid-solid ratio, put into concrete freeze-thaw cycle case, extracting Leaching of Heavy Metals liquid mensuration heavy metal concentration water-cement ratio with reference to HJ 557-2010 " solid waste Leaching leaching method horizontal vibration method " is 0.5, table 11 is the leaching content of cement paste test block its surperficial heavy metal element after being subject to freeze-thaw cycle 100 destructions.
Mix pre-treatment fly ash cement after table 11 freeze thawing and only starch Leaching of Heavy Metals concentration/(mg/L)
#: with reference to GB 5085.3-2007 " Hazardous wastes judging standard leaching characteristic identification "
Can be drawn by table 11, mix the cement-based material of pre-treatment washing flying ash after 100 freeze-thaw cycle, its ability to cure to the heavy metal element in flying dust keeps good, and the leaching concentration of its surperficial heavy metal is still far below national standard.
In sum, concrete freezing and thawing performance can be effectively improved after mixing a certain amount of incineration of refuse flyash, the test result of its mass loss rate and relative dynamic elastic modulus is all better than the examination group of not mixing flying ash, cement and material still can ensure good solidification effect to the heavy metal element in incineration of refuse flyash after freeze-thaw simultaneously, and its leaching concentration is significantly less than relative national standards.Therefore propose in the present invention utilize water-washing pre-treatment incineration of refuse flyash improve concrete anti-freezing property method safety, effectively, there is good practicality and economy.
Claims (6)
1. the method utilizing water-washing pre-treatment incineration of refuse flyash to improve agent on crack resistance of concrete freeze thawing performance, with cement, flyash, sand, stone and water concrete batching, it is characterized in that, substitute the cement of 5-20% massfraction with the incineration of refuse flyash through water-washing pre-treatment.
2. the method utilizing water-washing pre-treatment incineration of refuse flyash to improve agent on crack resistance of concrete freeze thawing performance according to claim 1, is characterized in that, the described composition of the incineration of refuse flyash primary chemical through water-washing pre-treatment is SiO
2, CaO, Al
2o
3and Fe
2o
3, and make the Leaching of flying dust lower than standard GB/T 5085.3-2007 " Hazardous wastes judging standard leaching characteristic identification " by water-washing pre-treatment.
3. the method utilizing water-washing pre-treatment incineration of refuse flyash to improve agent on crack resistance of concrete freeze thawing performance according to claim 2, the described incineration of refuse flyash particle diameter through water-washing pre-treatment concentrates on 3-55 μm.
4. the method utilizing water-washing pre-treatment incineration of refuse flyash to improve agent on crack resistance of concrete freeze thawing performance according to claim 1, it is characterized in that, the mass ratio of flyash and cement is 17-20%.
5. the method utilizing water-washing pre-treatment incineration of refuse flyash to improve agent on crack resistance of concrete freeze thawing performance according to claim 1, is characterized in that, be added with the admixture that quality is the 0.5-1% of cement in the concrete prepared.
6. the method utilizing water-washing pre-treatment incineration of refuse flyash to improve agent on crack resistance of concrete freeze thawing performance according to claim 5, it is characterized in that, described admixture is mainly water reducer.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110078436A (en) * | 2019-04-03 | 2019-08-02 | 中交四航工程研究院有限公司 | A kind of solid waste highly resistance folding concrete and preparation method thereof |
| CN111018415A (en) * | 2019-11-29 | 2020-04-17 | 谭纪林 | Concrete produced by using fly ash obtained by burning and curing industrial waste residues and wastes to replace natural sand and preparation method thereof |
| CN111454012A (en) * | 2020-05-28 | 2020-07-28 | 重庆市水务资产经营有限公司 | Clean application of water-washed domestic garbage incineration fly ash in cement stabilized macadam mixture |
| CN112159137A (en) * | 2020-10-12 | 2021-01-01 | 北京新奥混凝土集团有限公司 | Modified fly ash and application thereof in concrete |
| CN114163150A (en) * | 2021-07-23 | 2022-03-11 | 深圳市能源环保有限公司 | Method for preparing cementing material by using water-washed waste incineration fly ash and application |
| CN115477494A (en) * | 2022-06-13 | 2022-12-16 | 重庆交通大学 | Anti-freezing material for household garbage incineration fly ash and preparation method thereof |
| CN116023077A (en) * | 2022-12-27 | 2023-04-28 | 武汉大学 | Alkali-activated cementing material resistant to freeze-thawing cycle damage and preparation method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110078436A (en) * | 2019-04-03 | 2019-08-02 | 中交四航工程研究院有限公司 | A kind of solid waste highly resistance folding concrete and preparation method thereof |
| CN110078436B (en) * | 2019-04-03 | 2022-02-11 | 中交四航工程研究院有限公司 | Solid waste high-fracture-resistance concrete and preparation method thereof |
| CN111018415A (en) * | 2019-11-29 | 2020-04-17 | 谭纪林 | Concrete produced by using fly ash obtained by burning and curing industrial waste residues and wastes to replace natural sand and preparation method thereof |
| CN111454012A (en) * | 2020-05-28 | 2020-07-28 | 重庆市水务资产经营有限公司 | Clean application of water-washed domestic garbage incineration fly ash in cement stabilized macadam mixture |
| CN112159137A (en) * | 2020-10-12 | 2021-01-01 | 北京新奥混凝土集团有限公司 | Modified fly ash and application thereof in concrete |
| CN112159137B (en) * | 2020-10-12 | 2022-02-25 | 北京新奥混凝土集团有限公司 | Modified fly ash and application thereof in concrete |
| CN114163150A (en) * | 2021-07-23 | 2022-03-11 | 深圳市能源环保有限公司 | Method for preparing cementing material by using water-washed waste incineration fly ash and application |
| CN115477494A (en) * | 2022-06-13 | 2022-12-16 | 重庆交通大学 | Anti-freezing material for household garbage incineration fly ash and preparation method thereof |
| CN115477494B (en) * | 2022-06-13 | 2023-11-07 | 重庆交通大学 | Anti-freezing material for fly ash generated by incineration of household garbage and preparation method thereof |
| CN116023077A (en) * | 2022-12-27 | 2023-04-28 | 武汉大学 | Alkali-activated cementing material resistant to freeze-thawing cycle damage and preparation method thereof |
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Application publication date: 20150128 |
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