CN103739233B - A kind of preparation method of PET-brick powder material of construction - Google Patents
A kind of preparation method of PET-brick powder material of construction Download PDFInfo
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- CN103739233B CN103739233B CN201410001774.6A CN201410001774A CN103739233B CN 103739233 B CN103739233 B CN 103739233B CN 201410001774 A CN201410001774 A CN 201410001774A CN 103739233 B CN103739233 B CN 103739233B
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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 kind of preparation method of PET-brick powder material of construction, be 1:9:20 according to the mass ratio of flyash, PET and brick powder, wherein the mass ratio of binding agent and brick powder be after the compound mix of 1:2 under 300 DEG C of conditions melting 2h, PET stirs after melting completely, pours into rapidly in heating die trial, vibrate, compacting, leveling, under the curing temperature of 180 DEG C, curing time is 2h, is cooled to room temperature, form removal.The present invention's waste PET substitutes cement as gelling material, decreases the environmental pollution that manufacture of cement is brought, and avoids the consumption of the natural materials such as sand, stone.The material of construction ultimate compression strength that the method obtains can reach 40MPa, and folding strength reaches 12MPa, and anti-permeability performance is high, corrosion-resistant, and water-intake rate 0.8% can be widely used in the industries such as building, highway, bridge.
Description
Technical field
The invention belongs to building material technical field, be specifically related to a kind of preparation method of PET-brick powder material of construction.
Background technology
Along with expanding economy, the application of luminous building is paid attention in increasing city, and luminous building in beautifying city simultaneously, also consumes a large amount of electric power resources.According to statistics, only Tian'anmen Square head light power summation just reaches 100kW, and square is as communal facility, and the lighting time of average every day has exceeded 9 hours, and only throwing light on one all can consume a large amount of electric energy every year.Be decorative lighting greatly in the illumination of luminous building, do not need very high brightness, use lighting to create huge energy dissipation undoubtedly.
PET bottle has shock-resistance, the transparency, nontoxicity, high barrier and the advantage such as cheap, becomes the preferred material in drink pack field gradually.Although the fast development of plastic industry has been with convenience to people, because PET is corrosion-resistant, not easily degrade, nature has not had bacterium and the enzyme that can digest plastics, and waste PET has become again new source of pollution.Waste PET enters soil, can affect the material transfer in soil and microorganism growth, changes soil materials, polluted underground water source.Along with the increase of PET bottle usage quantity, the problem of environmental pollution that waste PET causes is also day by day serious.
Current China is in the peak time that house is teared down and built, and tears down the old house, builds new house, and carries out reducing energy consumption or secondary decoration to existing building, all can produce a large amount of waste material of buildings, expects the year two thousand twenty China also by New Dwelling 30,000,000,000 m
2, consequent waste material of buildings at least reaches 5,000,000,000 t.Therefore discarded clay brick is one of main study subject of construction refuse resource utilization.
Summary of the invention
For above-mentioned prior art, the technical problem to be solved in the present invention utilizes PET twice-laid stuff, flyash, brick powder etc., the preparation method of a kind of high-strength PET-brick powder material of construction is provided, the industries such as building, highway, bridge can be widely used in, realize the recycling of waste and old resource, reduce environmental pollution, environmental protection.
For solving the problem, the present invention is achieved through the following technical solutions:
A preparation method for PET-brick powder material of construction, comprises the following steps:
(1) be 1:9:20 according to the mass ratio of flyash, PET and brick powder, flyash and PET are binding agent, are compound melting 2h under 300 DEG C of conditions of 1:2 by the mass ratio of binding agent and brick powder;
Described brick powder particles grating mass ratio is as follows: particle diameter R represents, 4.75mm≤R < 9.5mm3%, 2.36mm≤R < 4.75mm17%, 1.18mm≤R < 2.36mm21%, 0.6mm≤R < 1.18mm23%, 0.3mm≤R < 0.6mm23%, 0.15mm≤R < 0.3mm8%, 0.075≤R < 0.15mm2%, R < 0.075mm3%;
(2), after PET melts completely, stir, pour into rapidly heating die trial in, vibrate, compacting, leveling, under the curing temperature of 180 DEG C, curing time is 2h, is cooled to room temperature, form removal.
The present invention proposes a kind of preparation method of PET-brick powder material of construction waste PET and clay brick combined, obtained PET-brick powder material of construction, strength criterion and luminous feature are applicable to paving tile and use.Both saved resource, and realized resource utilization recycling, additionally reduce the pollution of PET to environment, there is good Social and economic benef@.
The beneficial effect of the PET-brick powder material of construction that the present invention obtains is:
(1) substitute cement as gelling material with waste PET, decrease the environmental pollution that manufacture of cement is brought.Achieve the recycling of waste and old clay brick, avoid the consumption of the natural materials such as sand, stone.
(2) mechanical property is better, and its ultimate compression strength can reach 40MPa, and folding strength reaches 12MPa, can meet the requirement of buildings in general to the strength of materials.
(3) anti-permeability performance is high, corrosion-resistant, water-intake rate 0.8%, and chlorion displacement flux test-results is 43.2 coulombs, can be widely used in the industries such as building, highway, bridge.
(4) have early strong feature, after shaping 4h, pressure-proof and snap-resistent intensity just can reach more than 90% of its final strength, is applicable to the works of rapid construction in civil engineering work, and is plastic fracture when it destroys, more general water-setting concrete structure good toughness.
Accompanying drawing explanation
Fig. 1 is the stress-strain curve of the material of construction that embodiment obtains;
Fig. 2 is the change in intensity length of time of the material of construction that embodiment obtains;
Fig. 3 is the SEM scanned picture of the amplification 400 times of the material of construction that embodiment obtains;
Fig. 4 is the SEM scanned picture of the amplification 1000 times of the material of construction that embodiment obtains;
Fig. 5 is that the folding strength of material of construction under different PET consumption that embodiment obtains compares;
Fig. 6 is the ultimate compression strength change of material of construction under different curing that embodiment obtains;
Fig. 7 is the folding strength change of material of construction under different curing that embodiment obtains.
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment
Table 1 brick powder mixing grating B.
It is 1:9:20 that PET, flyash and brick powder as shown in table 1 are mixed grating according to the mass ratio of coal ash, PET and brick powder, and after mixing, 300 DEG C of heating melt, and heat-up time is 2h.Should keep in heat-processed ventilate and die trial should heat with above-mentioned compound simultaneously.PET stirs after melting completely, pour into rapidly in heating die trial, vibrate, compacting, leveling, maintenance naturally cooling after two hours under the curing temperature of 180 DEG C.
Can test by carrying out the sulphate-corrosion resistance of regenerative PET-brick powder test specimen under different gradation, determining major influence factors, proposing the durability evaluation index under sulphate crystal erosion environment.According to drying and watering cycle method, a circulation is weighed once, and one group of compressive strength test is done in ten circulations, and mass loss is as table 2:
The quality change of test specimen under table 2 sulphate attack.
As can be seen from the table, be immersed in building materials quality that the present invention in sulfate liquor obtains not loss increase to some extent on the contrary.Quality increase is because vitriol invades test specimen inside by modes such as infiltration and capillary absorptions, and when mortar specimen body humidity declines, vitriol and crystallization generate sodium sulfate crystal, but the increment of quality is less, this shows that the permeability resistance of material is fine.
Fig. 1 is the stress-strain curve of the PET-brick powder material of construction that the present invention obtains, and is that the displacements such as the fixed speed of 0.5mm/min load according to displacement.In way, A-B section stress rises with the increase of strain, and during B point, stress reaches maximum value, and stress is now the intensity of the material of construction that the present invention obtains.Test specimen presents stress decrease in B-C section, is because its internal structure is destroyed substantially, and along with the increase of displacement, remaining framework also destroys gradually and loses bearing capacity.There is longer load downcomer after when the load that PET test specimen bears as we can see from the figure reaches peak, can judge that it has good toughness thus.And toughness material often can absorb more energy under dynamic loading, and can effectively avoid unexpected brittle rupture, the slope of straight-line segment and i.e. Young's modulus are 2.1GPa.
The PET-brick powder material of construction that obtains of the present invention is after shaping 4h as seen from Figure 2, and namely intensity reach 36.9MPa, reaches 40.6Mpa during 6h, and its intensity remains unchanged substantially afterwards, also only has 40.8Mpa during 7d.As can be seen here, the strength development of PET-brick powder material of construction is exceedingly fast, and its major cause is the cementing system that its intensity relies on that PET condenses and brick powder forms jointly, substantially can realize the development of intensity after the cooling period.
Fig. 3 is the SEM scanned picture that PET-brick powder material of construction that the present invention obtains amplifies 400 times, obviously can observe PET on this yardstick and present good degree of compactness, present few hole, and this is also that it is good in impermeability, the reason that water-intake rate is lower.
Fig. 4 is the SEM scanned picture that PET-brick powder material of construction that the present invention obtains amplifies 1000 times, there is hole, and have fiber to tie repeatedly between brick powder particles and PET around visible brick powder particles.
The determination of brick powder grating
Because PET material is similar to pitch, therefore in examination timing, first carry out gradation design according to grains of sand formula AC-5 in " standard specification for construction and acceptance of highway asphalt pavement ", as shown in table 3:
Table 3 brick powder mixing grating A.
Pass through the existing brick particle diameter of examination allocation bigger than normal, powder is on the high side, and PET melts mixture very thickness that is rear and brick powder, and test specimen is difficult to shaping, and the test specimen made presents comparatively concrete dynamic modulus, and Forming Quality is not good.
So the size grading of water draw cement concrete medium sand, readjusts the grating of brick powder, decrease the content of powder and 2.36mm particle, increase the content of 0.6mm and 0.3mm particle, new grating is as shown in table 1:
Table 1 brick powder mixing grating B.
After Adjusted gradation, the mobility of PET-brick powder mixture is significantly improved, and shaping rear test specimen pattern rule, therefore chooses grating B in follow-up test.
The determination of consumption of binder
Under the prerequisite meeting requirement of strength, the uniformity that compound is good will be ensured simultaneously, have chosen the different binding agent of 1:1,1:2,1:3 tri-groups herein and brick powder amount ratio carries out simultaneous test, for improving workability, flyash is used to replace the PET of 10%, find when consumption of binder is than 1:1 with brick powder consumption time shaping, test specimen shows huge volumetric shrinkage, even produce cavity at component inside, and when amount ratio is 1:3, PET under molten state effectively cannot wrap up brick powder particles, thus makes to be built into loose porous state.Because test specimen defect is particularly remarkable in resistance to compression test specimen, and 1:1 group anti-folding test specimen produces obvious cavity, therefore only contrasts the folding strength of 1:2 group and 1:3 group.When binding agent and brick powder ratio are 1:2, the folding strength of test specimen reaches 10.55MPa and 13.47MPa respectively, and when binding agent and brick powder ratio are 1:3, the folding strength of test specimen is only 6.85MPa and 5.63MPa.The former exceeds nearly one times than the latter by folding strength, has clear superiority.
The selection of curing temperature
In test, the melt temperature of PET is at about 300 DEG C, and shaping and be cooled in the process of room temperature at it, contraction to a certain degree can occur volume.If under being directly exposed to room temperature, then the PET material on top layer cools rapidly and shrinks, and internal heat has little time to distribute, thus forms internal-external temperature difference, and produces pulling force at skin.And now PET to also maintains temperature higher, and the state that intensity is lower, easily ftractures under action of pulling stress.Therefore after specimen molding, need the maintenance it being carried out to the short period of time, to reduce its internal-external temperature difference, and make it cool according to less thermograde.Tentative curing time is 2h, and carry out pressure-proof and snap-resistent strength test to the test specimen of different curing, result is as Fig. 7, Fig. 6.
As can be seen from Fig. 7 and Fig. 6, resistance to compression and the folding strength of test specimen increase along with the raising of curing temperature, and when curing temperature is 180 DEG C, ultimate compression strength or the folding strength of test specimen reach maximum.Its ultimate compression strength is up to 43.4MPa, and compared with the test piece intensity 30.8MPa of maintenance under room temperature, intensity adds nearly 50%, and folding strength, up to 13.2MPa, therefore, is selected 180 DEG C and tested as the curing temperature finally determined.
The mensuration of apparent density
Because the proportion of PET is only 1.67, and the proportion of clay brick powder is also less than sandstone for building, and therefore the density of PET-brick powder material is less than sand-cement slurry and concrete.The apparent density evaluation of estimate recorded through water weight method is 1.84 × 10
3kg/m
3, the density of normal concrete (is about 2.4 × 10
3kg/m
3).Specific experiment numerical value is as shown in table 4.
Table 4 apparent density measurement result.
The mensuration of water-intake rate
Water-intake rate is an important research index of weather resistance.Prepare test specimen by regulation, be immersed in water by whole mortar specimen, the water surface must exceed test specimen about 20mm, every other day takes out test specimen, dries surface of test piece and records test specimen quality.Until test specimen quality no longer increases, test-results is as shown in table 5:
Quality after the water suction of table 5 test specimen.
As can be seen from the above table, the water-intake rate of test specimen just reaches stationary value 0.8% after 2 days, and water suction mainly occur in test specimen enter water 30min within (about 0.5%), mainly PET material of tracing it to its cause is impervious good, and brick powder then has stronger water-absorbent.After test specimen enters water, the powder particles that turns of its surface exposure absorbs water and water of satisfying at short notice, and after this test specimen presents lower water-absorbent.
By reference to the accompanying drawings the specific embodiment of the present invention is explained in detail although above-mentioned; but not limiting the scope of the invention; in the ken that those skilled in the art possess, do not need to pay various amendments that creative work can make still within protection scope of the present invention.
Claims (1)
1. a preparation method for PET-brick powder material of construction, is characterized in that, comprise the following steps:
(1) according to flyash, the mass ratio of PET and clay brick powder is 1:9:20, flyash and PET are binding agent, by compound melting 2h under 300 DEG C of conditions that the mass ratio of binding agent and clay brick powder is 1:2, described clay brick powder particles grating mass ratio is as follows: particle diameter R represents, 4.75mm≤R < 9.5mm3%, 2.36mm≤R < 4.75mm17%, 1.18mm≤R < 2.36mm21%, 0.6mm≤R < 1.18mm23%, 0.3mm≤R < 0.6mm23%, 0.15mm≤R < 0.3mm8%, 0.075≤R < 0.15mm2%, R < 0.075mm3%,
(2), after PET melts completely, stir, pour into rapidly heating die trial in, vibrate, compacting, leveling, under the curing temperature of 180 DEG C, curing time is 2h, is cooled to room temperature, form removal.
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|---|---|---|---|---|
| CN101376577A (en) * | 2007-08-30 | 2009-03-04 | 北京曲全环保科技有限公司 | Plastic and solid waste combined building material and production method thereof |
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| CN101376577A (en) * | 2007-08-30 | 2009-03-04 | 北京曲全环保科技有限公司 | Plastic and solid waste combined building material and production method thereof |
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