CN102674729A - Method for curing urban building waste at low temperature and normal pressure to produce building material - Google Patents
Method for curing urban building waste at low temperature and normal pressure to produce building material Download PDFInfo
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- CN102674729A CN102674729A CN2012101526208A CN201210152620A CN102674729A CN 102674729 A CN102674729 A CN 102674729A CN 2012101526208 A CN2012101526208 A CN 2012101526208A CN 201210152620 A CN201210152620 A CN 201210152620A CN 102674729 A CN102674729 A CN 102674729A
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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
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- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention belongs to a method for curing urban building wastes at low temperature and normal pressure to produce building materials. In consideration of the practical situation that the problem caused by domestic and overseas building wastes is increasingly prominent, the urban building wastes are cured at 100DEG C and normal pressure to produce a high-strength novel building material. The curing process comprises the steps of: firstly conducting crushing and grinding pretreatment to the building wastes, then adding a certain quantity of slaked lime, mixing t pretreatment to the building wastes with alkaline solution or water, molding the mixture by using a press, and finally curing molded bodies obtained after demolding to obtain the high-strength material with flexural strength which can reach above 18MPa. The cured material provided by the invention can be used for producing building materials such as wall tiles, pavement tiles paving tile and river revetment materials. The production method by using an autoclave is abandoned and the building wastes are cured at 100DEG C and normal pressure without using the autoclave to produce the novel building material. Since the curing process is conducted at normal pressure and can be a continuous production process, not only can the production cost and the equipment cost of the building material be effectively reduced, but also the energy consumption can be greatly reduced.
Description
Technical field
The invention belongs to inorganic waste recycling field, being specifically related to a kind of low-temperature atmosphere-pressure curing urban architecture rubbish is the method for material of construction.
Background technology
Urbanization process has not only been aggravated the anxiety of China's urban land, resource, and has been brought a large amount of building wastes.At present, the urban architecture rubbish of China generally is about 30% of municipal wastes total amount, and annual turnout reaches 5,000 ten thousand t.Like the output with the building waste of per ten thousand m2 building is that the standard of 500 ~ 600t calculates that to the year two thousand twenty, China also will increase floor area of building 30,000,000,000 m2 newly, and the new building waste that produces will be a shocking numeral.At present, the main mode of building waste being handled is to carry out landfill, stack or as the filling material of building lot.
China's building waste is mainly used in aspects such as production environment-friendly type fragment of brick, regeneration aggregate and Piled Mountain Landscape on Construction at present.But reason such as single owing to its product, that added value is low, applicable surface is narrow has seriously limited popularizing of construction refuse regenerated resource utilization.In addition, China's building waste also exists recovery utilization rate low, and the renewable resource state of the art is backward relatively, lacks the present situation of new technology, novel process.Therefore study new technology ten minutes necessity that building waste utilizes again.
Chinese patent " utilizing building waste to produce autoclaved brick " (open day 2007.09.26; Publication number CN101041567) disclosing a kind of is main raw material(s) with building waste, flyash, lime (or carbide slag) and admixture etc.; The technology of development and production autoclaved fly ash brick made from waste; Wherein the consumption of building waste is 15%～55%, and optimum range is 20%～35%, and goods are placed greater than 100 ℃ saturation steam (reaction kettle) handles.This technology is lower to the building waste utilization ratio, and the production temperature is higher relatively need in reaction kettle, carry out.
Chinese patent " utilizing building materials of building waste production and preparation method thereof " (open day 2009.01.21, publication number CN101348343) discloses a kind of building materials that utilize building waste production and preparation method thereof.Need be but the method for this invention prepares material of construction at 190 ~ 230 ℃ of steam press maintenances, this process need carries out in autoclave.The reaction kettle cost is high, and use needs the maintenance cost of great number, and in addition, its production process is an intermittent process (charging-intensification pressurization-constant temperature-cooling decompression-sampling) when using autoclave, makes production technique very long.These improve product cost, and energy expenditure strengthens.
Produce if can realize low temperature (100 ℃), because water is normal pressure at 100 ℃ saturated vapor pressure, so its preparation pressure is normal pressure just.Not only need not use autoclave to make production process can realize continuity production this moment, and its production process can simplify greatly, and production cost and energy consumption also all can descend greatly.
Summary of the invention
The objective of the invention is to propose a kind of low-temperature atmosphere-pressure curing urban architecture rubbish is the method for material of construction.Said method provides a kind of new way for the urban architecture garbage as resource, improves the resource utilization efficient of urban architecture rubbish; Through this solidified method, do not use at low temperature (100 ℃) normal pressure under the condition of reaction kettle and utilize urban architecture rubbish to prepare high-quality New Building Materials again, simplify production process, enhance productivity (continuous production) and save energy.
It is the method for material of construction that the low-temperature atmosphere-pressure that the present invention proposes solidifies urban architecture rubbish, is that urban architecture rubbish such as waste and old concrete, waste and old common brick are cured as the method with high-intensity material of construction, and concrete steps are following:
Selecting urban architecture rubbish for use is raw material, carries out pulverization process, add slaked lime then and mix with water or alkaline solution, and after mixing, compression moulding; Again with the sample after the demoulding, be that 100 ℃ water saturation vapour pressure (normal pressure) is handled 12 ~ 72h down in temperature, promptly obtain desired product; Wherein: the weight percentage of urban architecture rubbish is 60% ~ 90%, and slaked lime is 10% ~ 40%.
Among the present invention, said urban architecture rubbish comprises waste and old concrete or waste and old common brick one to two kind, and in the mixture of waste and old concrete and common brick, the weight percentage of waste and old concrete is 10% ~ 90%, and the weight percentage of waste and old common brick is 10% ~ 90%.
Among the present invention, said alkaline solution is a sodium hydroxide solution.
Among the present invention, the addition of said water or alkaline solution is 5 ~ 20wt% of urban architecture rubbish and slaked lime gross weight.
Among the present invention, the concentration of said alkaline solution is 1 ~ 4mol/L.
Characteristics of the present invention are: depleted urban architecture rubbish is prepared high-intensity material of construction.Its preparation process is atmospheric low-temperature (100 ℃), so can not use autoclave, makes that so not only facility investment reduces greatly, and its process also can realize continuity production, the reduction (seeing Figure 14) greatly of consuming energy.
The present invention has realized that the resource utilization of urban architecture rubbish utilizes again, has solved the low temperature continuity and has solidified a difficult problem of producing material of construction, and the preparation high-strength building material can be used for aspects such as wall floor tile, paving tile, pavior brick and rivers bank protection material.This technology both can be utilized waste, can significantly reduce the energy consumption in the production process again, greatly reduced the load to environment.
Description of drawings
Fig. 1: low-temperature curing urban architecture rubbish is the technical process of material of construction.
Fig. 2: the alkaline solution addition solidifies the influence of back folding strength to concrete sample.
Fig. 3: slaked lime content solidifies the influence of back folding strength to concrete sample.
Fig. 4: alkaline concentration solidifies the influence of back folding strength to concrete sample.
Fig. 5: set time concrete sample is solidified the influence of back folding strength.
Fig. 6: the concrete sample intensity of interpolation water is change curve in time.
Fig. 7: the alkaline solution addition solidifies the influence of back folding strength to the common brick sample.
Fig. 8: alkaline concentration solidifies the influence of back folding strength to the common brick sample.
Fig. 9: slaked lime content solidifies the influence of back folding strength to the common brick sample.
Figure 10: set time the common brick sample is solidified the influence of back folding strength.
Figure 11: the common brick sample intensity of interpolation water is change curve in time.
Figure 12: the concrete of different proportionings and common brick solidify the back folding strength relatively.
Figure 13: the FESEM morphology change of common brick sample before and after the solidification treatment.Wherein: (A) for before handling, (B) for after handling.
Figure 14: continous way preparation technology's conceptual schematic view.
Embodiment
Further specify the present invention through embodiment below.
Embodiment 1:
At first, the waste and old concrete of choosing after the pulverizing is a raw material, adds weight percentage and be 10% slaked lime powder, adds the water of pan feeding gross weight 5% then, after stirring, in the moulding of tabletting machine pressed; At last, the sample that suppresses is put into reaction vessel, solidification treatment 48h under 100 ℃ water saturation vapour pressure obtains final sample.
Embodiment 2:
At first, the waste and old concrete of choosing after the pulverizing is a raw material, adds 30% slaked lime powder, adds the water of pan feeding gross weight 15% then, after stirring, in the moulding of tabletting machine pressed; At last, the sample that suppresses is put into reaction vessel, solidification treatment 48h under 100 ℃ water saturation vapour pressure obtains final sample.
Embodiment 3:
At first, the waste and old common brick of choosing after the pulverizing is a raw material, adds 30% slaked lime powder, adds the sodium hydroxide solution of the 4mol/L of pan feeding gross weight 5% then, after stirring, in the moulding of tabletting machine pressed; At last, the sample that suppresses is put into reaction vessel, solidification treatment 48h under 100 ℃ water saturation vapour pressure obtains final sample.
Embodiment 4:
At first; Waste and old concrete and each mixture of 50% of waste and old common brick of choosing after the pulverizing are raw material, add weight percentage and be 30% slaked lime powder, add the sodium hydroxide solution of the 3mol/L of pan feeding gross weight 10% then; After stirring, in the moulding of tabletting machine pressed; At last, the sample that suppresses is put into reaction vessel, solidification treatment 48h under 100 ℃ water saturation vapour pressure obtains final sample.
The intensity of solidify material improves mechanism: in the solidification process, through having generated a type hydrated cementitious product in the chemical reaction cured body: hydrated calcium silicate (CaO-SiO
2-H
2O, C-S-H), these sheet hydrated calcium silicates that are interweaved together are created between endocorpuscular surface of material and the particle, have filled the particle gap, have improved the density of material, cause intensity to increase.
Through introducing variablees such as the sodium hydroxide addition of the present invention through changing test, naoh concentration, slaked lime content, reaction times, the data image that is cured further specifies the present invention below.
Fig. 1 is the whole process flow of material of construction for low-temperature curing urban architecture rubbish.
Fig. 2 is the influence of alkaline solution addition to the concrete sample cured strength.Experiment condition does, in a certain amount of waste and old concrete sample, adds the sodium hydroxide solution that is equivalent to sample mass 0,5%, 10%, 15% 2 mol/L, under 100 ℃ condition, solidifies 48h after the compression moulding.As can be seen from the figure, when not adding sodium hydroxide solution, its sample strength is zero.Along with the increase of sodium hydroxide addition, the folding strength of cured body increases to some extent, and addition is that 15% o'clock intensity is maximum.When addition surpassed 20%, the sample pressing process has solution just to have to ooze out made it to reach higher.This figure shows that the adding of alkaline solution can significantly change the intensity of cured body, and certain alkaline solution adds the rate of mass transfer that can accelerate solid particulate in the sample, promotes reaction to carry out.
Fig. 3 is slaked lime content solidifies the back folding strength to concrete sample influence.Experimental technique is in the waste and old concrete sample, to add slaked lime; The weight percentage that makes slaked lime is 0,10%, 20%, 30%, 40%; And add the sodium hydroxide solution of the 2mol/L of whole sample mass 15%, under 100 ℃ condition, solidify 48h after the compression moulding.As can be seen from the figure, along with the increase of slaked lime content, the folding strength of cured body increases afterwards earlier and reduces, and folding strength is near 18MPa when 30% slaked lime.Because the slaked lime of adding can generate the C-S-H crystal with crystalline phases such as the quartz reaction in the waste and old concrete, increases cured body intensity, so the adding along with slaked lime significantly increases to sample intensity, but the adding of too much slaked lime has spinoff to intensity on the contrary.
Fig. 4 is alkaline concentration solidifies the back folding strength to concrete sample influence.Get the waste and old concrete sample that contains 30% slaked lime, add the sodium hydroxide solution of 1mol/L, 2mol/L, 3mol/L, 4mol/L, under 100 ℃ of conditions, solidify 48h.Image reflects the increase along with naoh concentration, and the intensity of cured body increases the back at present and reduces, and reaches maximum 18MPa during for 3mol/L in concentration.The adding of alkali can be dissolved siliceous in the concrete material, promotes the carrying out of reaction, but the alkali of excessive concentrations has spinoff to the generation of CSH.
Fig. 5 solidifies the influence of back folding strength set time to concrete sample.Get the waste and old concrete sample that contains 30% slaked lime, add the sodium hydroxide solution of 15% 3mol/L, under 100 ℃ of conditions, solidify 0h, 12h, 24h, 48h, 72h (wherein 0h refer to uncured react direct test sample folding strength).As can be seen from the figure, initial reaction stage, sample intensity constantly increases, and arrives after the 48h, continues response intensity and reduces on the contrary.Hence one can see that for concrete sample best set time be 48h.Under identical set time, the intensity of sample that the strength ratio of adding the sample of alkaline solution is not added alkali is big.
Fig. 6 is the concrete sample intensity of adding water change curve in time.Get the waste and old concrete sample that contains 30% slaked lime, add 15% water, under 100 ℃ of conditions, solidify 0h, 12h, 24h, 48h, 72h and obtain this figure line.Reflect the increase along with the reaction times among the figure, sample intensity constantly increases.
Fig. 7 is the influence of alkaline solution addition to common brick sample cured strength.Experiment condition does, in a certain amount of waste and old common brick sample (containing 30% slaked lime in the sample), adds the sodium hydroxide solution that is equivalent to sample mass 0,5%, 10%, 15%, 20% 3 mol/L, under 100 ℃ condition, solidifies 48h after the compression moulding.As can be seen from the figure, along with the increase of alkaline solution addition, the folding strength of cured body increases afterwards earlier and reduces, and is 5% o'clock intensity maximum at the addition of alkaline solution.Alkaline solution identical with the mechanism of action to concrete sample to the mechanism of action of common brick sample.
Fig. 8 is alkaline concentration solidifies the back folding strength to the common brick sample influence.Get the waste and old common brick sample that contains 30% slaked lime, add the sodium hydroxide solution of 0.5ml 1mol/L, 2mol/L, 3mol/L, 4mol/L, under 100 ℃ of conditions, solidify 48h.Image reflects the increase along with naoh concentration, and the intensity of cured body increases the back at present and reduces, and reaches maximum in concentration during for 3mol/L.
Fig. 9 is slaked lime content solidifies the back folding strength to the common brick sample influence.Experimental technique is in waste and old common brick sample, to add slaked lime, and the weight percentage that makes slaked lime is 0,10%, 20%, 30%, 40%, and adds the sodium hydroxide solution of 3 mol/L of whole sample mass 5%, under 100 ℃ condition, solidifies 48h after the compression moulding.As can be seen from the figure, along with the increase of slaked lime content, the folding strength of cured body increases afterwards earlier and reduces, and folding strength surpasses 25MPa when 30% slaked lime, though intensity slightly descends afterwards, but still keeps higher numerical value.Because the slaked lime that adds can generate the CSH crystal with crystalline phases such as the quartz reaction in the waste and old concrete; Increase cured body intensity; So the adding along with slaked lime significantly increases to sample intensity, but, excessive slaked lime can cause figure line to glide to destroying its intensity when remaining in the cured body.Consider that in conjunction with factors such as costs in the actual production 30% slaked lime addition should be only selection.
Figure 10 solidifies the influence of back folding strength set time to the common brick sample.Get the waste and old common brick sample that contains 30% slaked lime, add the sodium hydroxide solution of 5% 3 mol/L, under 100 ℃ of conditions, solidify 0h, 12h, 24h, 48h, 72h (wherein 0h refer to uncured react direct test sample folding strength).As can be seen from the figure, initial reaction stage, sample intensity constantly increases, and arrives after the 48h strength degradation.Hence one can see that for common brick sample best set time be 48h.
Figure 11 is the common brick sample intensity of adding water change curve in time.Get the waste and old common brick sample that contains 30% slaked lime, add 15% water, under 100 ℃ of conditions, solidify 0h, 12h, 24h, 48h, 72h and obtain this figure line.Reflect the increase along with the reaction times among the figure, sample intensity constantly increases.
Figure 12 is that the concrete and the common brick of different proportionings solidifies the back folding strength relatively.The weight percentage of waste and old concrete is 10% ~ 90% in the building waste raw material, and the weight percentage of waste and old common brick is 10% ~ 90%.All the other experiment conditions are: the quality of sample medium-slaking lime accounts for 30%, adds the sodium hydroxide solution of the 3mol/L that is equivalent to sample mass 10%, under 100 ℃ of conditions, solidifies 48h after the compression moulding.Can know that from image though the building waste sample cured strength of different proportionings has certain difference, intensity can both reach about 11MPa, meets requirement of strength.The method scope of application of proof low-temperature curing building waste is quite wide.
The FESEM morphology change of common brick sample before and after Figure 13 solidification treatment.Wherein (A) is the FESEM figure of untreated waste and old concrete sample, and by finding out that before the processing, what bigger sand grain was loose is deposited in together among the figure, the gap is bigger between particle.(B) be FESEM figure behind the solidification treatment 48h; Can find out that produced a large amount of flaky CSH crystal between the macrobead of silt or on the large particle surface, these crystal have effectively been filled original particulate gap; The cured body density is increased substantially, and intensity increases thus.
Shown in Figure 14 is process flow sheet of the present invention.Just as the tunnel of firing ceramics, pressed green body slowly gets into curing apparatus (equipment can be general heat-insulating construction material and builds by laying bricks or stones) by leading portion and is cured processing, feeds 100 ℃ water vapour in the curing apparatus.After disposing, the material that the slave unit the other end comes out is finished product.
More than the present invention has been carried out detailed introduction, used concrete instance in the literary composition the present invention set forth, this is can understand and use the present invention for the ease of the those of ordinary skill of this technical field.Being familiar with those skilled in the art can easily make various modifications to these embodiment, and needn't pass through performing creative labour being applied among other embodiment in thought of the present invention.Therefore, the invention is not restricted to the embodiment here, those skilled in the art should be within protection scope of the present invention for improvement and modification that the present invention makes according to announcement of the present invention.
Claims (5)
1. a low-temperature atmosphere-pressure curing urban architecture rubbish is the method for material of construction; Its characteristic being used for concrete steps is: selecting urban architecture rubbish for use is raw material, carries out pulverization process, adds slaked lime then and mixes with water or alkaline solution; After mixing, compression moulding; Again with the sample after the demoulding, be that 100 ℃ water saturation vapour pressure is to handle 12 ~ 72h under the normal pressure in temperature, promptly obtain desired product; Wherein: the weight percentage that urban architecture rubbish is is 60% ~ 90%, and slaked lime is 10% ~ 40%.
2. method according to claim 1; It is characterized in that: said urban architecture rubbish be in waste and old concrete or the waste and old common brick more than one; In the mixture of waste and old concrete and common brick, the weight percentage of waste and old concrete is 10% ~ 90%, and the weight percentage of waste and old common brick is 10% ~ 90%.
3. method according to claim 1 is characterized in that: said alkaline solution is a sodium hydroxide solution.
4. method according to claim 1 is characterized in that: the addition of said water or alkaline solution is 5 ~ 20wt% of urban architecture rubbish and slaked lime gross weight.
5. method according to claim 3 is characterized in that: sodium hydroxide solution solubility is 1 ~ 4mol/L.
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Cited By (3)
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| CN104743998A (en) * | 2015-03-06 | 2015-07-01 | 同济大学 | Method for wet-type burning sea sand to produce high strength building material |
| CN106927737A (en) * | 2017-03-06 | 2017-07-07 | 同济大学 | A kind of preparation method of lime ground mass high-intensity building materials |
| CN108002790A (en) * | 2017-11-06 | 2018-05-08 | 同济大学 | A kind of method that humidity adjusting material is prepared using discarded concrete |
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| CN101717226A (en) * | 2009-11-27 | 2010-06-02 | 同济大学 | Method for solidifying blast furnace slag into building material |
| CN102173729A (en) * | 2011-01-05 | 2011-09-07 | 张佛西 | Novel process for preparing masonry material by waste solidification treatment |
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| CN101560810A (en) * | 2009-05-07 | 2009-10-21 | 广汉胜普轻质隔墙板有限公司 | Ecological light weight partition wall board |
| CN101717271A (en) * | 2009-11-05 | 2010-06-02 | 同济大学 | Method for preparing porous material from soil-textured raw material |
| CN101717226A (en) * | 2009-11-27 | 2010-06-02 | 同济大学 | Method for solidifying blast furnace slag into building material |
| CN102173729A (en) * | 2011-01-05 | 2011-09-07 | 张佛西 | Novel process for preparing masonry material by waste solidification treatment |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104743998A (en) * | 2015-03-06 | 2015-07-01 | 同济大学 | Method for wet-type burning sea sand to produce high strength building material |
| CN104743998B (en) * | 2015-03-06 | 2016-08-24 | 同济大学 | A kind of sea sand wet type is fired the method becoming high-intensity building materials |
| CN106927737A (en) * | 2017-03-06 | 2017-07-07 | 同济大学 | A kind of preparation method of lime ground mass high-intensity building materials |
| CN106927737B (en) * | 2017-03-06 | 2019-07-05 | 同济大学 | A kind of preparation method of lime ground mass high-intensity building materials |
| CN108002790A (en) * | 2017-11-06 | 2018-05-08 | 同济大学 | A kind of method that humidity adjusting material is prepared using discarded concrete |
| CN108002790B (en) * | 2017-11-06 | 2020-12-01 | 同济大学 | Method for preparing humidity-adjusting material by using waste concrete |
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Application publication date: 20120919 |