CN104237491B - A kind of cold renewal emulsifying agent method for optimizing based on mixture performance - Google Patents
A kind of cold renewal emulsifying agent method for optimizing based on mixture performance Download PDFInfo
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Abstract
Cold renewal emulsifying agent method for optimizing based on mixture performance provided by the invention, comprise the steps: that (1) measures early strength, (2) transportation stability is measured, (3) measure globality, (4) emulsifying agent optimum condition is: A, cohesion are greater than 180g/cm
2early strength is qualified, and is more applicable to quick open to traffic more greatly; B, Cold Recycled Mixture with Emulsified Asphalt are less than this operable time from production to the time needed for construction rolling, and transportation stability is qualified; C, to take out complete core be that globality is qualified.Test method provided by the invention can the cold renewal emulsifying agent of preferably different construction and application conditions.
Description
Technical field
The present invention is a kind of method for preferred cold renewal emulsifying agent, and especially a kind of method comparatively easily solving preferred cold renewal monomer emulsifying agent or composite emulsifier, belongs to asphalt highway technical field of performance test.
Background technology
The design life of bituminous pavement is generally 8 to 15 years, from counting now, every year by have an appointment 10% bituminous pavement enter maintenance or reconstruction cycle, annual consequent waste asphalt pavement material will reach ton up to a million.If recycling utilization can be carried out after these waste asphalt pavement material recovery, the Master Cost of at least several hundred million unit will be saved every year, and along with the continuous construction of infrastructure, these data also constantly increase in the speed with annual about 15%.
Emulsified asphalt cold recycling technology is after the old surface layer on original road surface is carried out milling, fragmentation, screening, by analyzing the old pipeline material of recovery, add a certain amount of emulsified asphalt, and according to the feature of original ground surface material and actual demands of engineering, fully mix and stir after can adding newly the gathering materials of some, mixture laying after regeneration is had on the roadbase meeting code requirement intensity and flatness, roll, make it reach the mixture structure layer construction technology of bituminous pavement property requirement.
Emulsified asphalt cold recycling technology can consume a large amount of old material, can reduce the stacking of reclaiming old material, reduces because old stockpile puts the environmental pollution and land occupation caused; Emulsified asphalt cold recycling technology can save the non-renewable resources such as a large amount of sand materials, reduces because exploitation of stone is to the destruction of environment, contributes to recovery of ecologic environment in a mine and environmental protection, be conducive to recycling economy development; Cold Recycled Mixture with Emulsified Asphalt is produced at normal temperatures, construct, and reducing because heating the energy consumed, reducing CO2 emission, reduce the toxic gas discharges such as glance coal, meet the development trend of current energy-saving and emission-reduction, low-carbon environment-friendly.
When storing under normal temperature condition, emulsified asphalt is the liquid suspended mixture with good fluidity, namely the particle of pitch at the repulsive force acting in conjunction low suspension of gravity and surface charge in water.In the process that pitch particle collides with each other, also there will be the phenomenon that a small amount of particle contacts is reunited, but, due to this agglomeration occur little, quality and the result of use of emulsified asphalt can not be affected.When emulsified asphalt and RAP expect to mix and stir, because the electric charge of emulsified asphalt particle surface and the electric charge of stone surface there occurs neutralization reaction, the electric charge of pitch particle does not disappear completely, also be not combined into the asphalt membrane with intensity securely, Here it is building stones (comprising reclaimed materials) and emulsified asphalt have have just mixed and stirred into state during cold regeneration mix.The time length that this state exists, relevant with the character of gathering materials, the more important thing is the type of emulsifying agent.When the emulsifying agent of slow hardening type is split in employing slowly, this state keeps several days time sometimes, and deviser can by the length regulating the formula of emulsifying agent regulate this process.Rolling through street roller, moisture content evaporate completely with pitch particle electric charge completely in and after, pitch particle further combined with, part pitch connects into asphalt membrane completely, now, the intensity of cold regeneration mix has reached the requirement of open to traffic, but does not also reach maximum intensity.The high temperature action paved through secondary and the traffic of a period of time roll, and the particle of pitch can be further combined with, and form completely solid-state solid asphalt membrane, at this moment compound intensity reaches maximal value, and mixture structure also becomes suitable stable.Cold Recycled Mixture with Emulsified Asphalt is that an emulsified asphalt---water---is gathered materials formed equilibrium system, and stable equilibrium, the balance of this system are broken, early strength is formed, intensity improves main relevant with monomer emulsifying agent or composite emulsifier character gradually.
The production of emulsified asphalt is the basis of emulsified asphalt cold recycling technology, emulsifying agent be then preferably the guarantee of Cold Recycled Mixture with Emulsified Asphalt performance and engineer applied effect.Cold renewal emulsified asphalt not only should meet emulsified asphalt performance index, also should meet the needs in engineering.As: when engineering is different, RAP used and mineral aggregate different in kind, emulsified asphalt and mineral aggregate should have and wrap effect preferably; Time distant between working-yard and compound factory, Cold Recycled Mixture with Emulsified Asphalt still should have good workability and workability (rammability) after long-distance transportation, namely Cold Recycled Mixture with Emulsified Asphalt in discharging, pave, there is good mobility in the process of compacting; When emulsified asphalt cold recycling technology is applied to urban road, due to cannot close traffic health, must open to traffic fast, Cold Recycled Mixture with Emulsified Asphalt should have higher early strength; Weather conditions when between preserving period are the cloudy day, rain, or when road both sides have house and trees to block, Cold Recycled Mixture with Emulsified Asphalt intensity should increase comparatively fast, and when namely moisture loss is slower, the compound after health should have good globality.Due to the restriction of above-mentioned engineering specifications, although cause emulsified asphalt to meet the technical indicator of specification defined, but when practical application often cannot practical requirement and cause construction normally to carry out or Pavement Condition decline, therefore, above-mentioned technological difficulties and engineering specifications be emulsifying agent preferably in need the key factor of consideration badly.
But, at present also not for the technological difficulties in production, construction, the method for preferred emulsifier targetedly.
Summary of the invention
The object of this invention is to provide a kind of method for preferred cold renewal monomer or composite emulsifier, can for the technological difficulties in production, construction, preferred emulsifier targetedly, thus checking emulsified asphalt formula, the method is simple, solves the problem of current nothing based on the cold renewal emulsifying agent method for optimizing of mixture performance.
Technical scheme:
In the links of emulsified asphalt cold recycling technology application, there are certain technological difficulties, need Emulsified Asphalt Mixture to meet different performance requirements, thus ensure the smooth enforcement of emulsified asphalt cold recycling technology.Therefore, as shown in table 1, the present invention is directed to the technological difficulties in production, construction and use procedure, propose the corresponding performance requirement of Cold Recycled Mixture with Emulsified Asphalt and evaluation method respectively.
Cold renewal based on mixture performance emulsifying agent method for optimizing, comprise the steps: that (1) measures early strength, (2) measure transportation stability, and (3) measure globality, and (4) emulsifying agent characteristic is preferred;
The assay method of described early strength is: (11), according to target mix design result mixing Cold Recycled Mixture with Emulsified Asphalt, adopt gyratory compaction molding to prepare cylinder specimen,
(12) be 20 DEG C by institute's shaping test piece in temperature, health 4h in the constant-temp. and-moisture maintenance of relative humidity 90%, health terminates rear reference Zhengzhou University master thesis " hgh-performance emulsified pitch cold in-plant recycling Mixture Design Method research " and carries out cohesion test determination immediately;
The assay method of described transportation stability is:
(21) according to target mix design result mixing Cold Recycled Mixture with Emulsified Asphalt A, get part A material and make shaping test piece 1, timing starts to be zero, and remaining A expects that plastic bag sealing is stand-by,
(22) at interval of the S time, identical method is adopted, the test specimen 2,3,4 of preparation equal in quality ... n, described n are positive integer,
(23) to complete n test specimen time total molding time be greater than when Practical Project haulage time or height of specimen significantly increase and stop,
(24) by institute's shaping test piece 1,2,3,4 ... ventilated drying oven health put into by n and not shaping remaining A material, and described health is leave standstill 48h in 60 DEG C of ventilated drying ovens,
(25) by the test specimen 1,2,3,4 after health ... n takes out, and to be cooledly to room temperature, measures its bulk density ρ respectively by water weight method
n; Remaining A material after health is taken out and tests its theoretical maximum specific density ρ,
(26) calculation testing piece voidage V
n, V
n=(1-ρ
n/ ρ) × 100%, and draw test specimen voidage with molding time change curve, according to " asphalt highway regeneration techniques specification " requirement, Cold Recycled Mixture with Emulsified Asphalt voidage scope is 9 ~ 14%, therefore reading the molding time maximal value of test specimen voidage <14% from curve, is Cold Recycled Mixture with Emulsified Asphalt operable time S
w;
Described globality assay method is:
(31) according to target mix design result mixing Cold Recycled Mixture with Emulsified Asphalt, gyratory compaction molding prepares cylinder specimen, and height of specimen is equal with institute's making emulsified asphalt cold renewal layer thickness in engineering,
(32) the test specimen surrounding of forming and an end face plastic sheeting are wrapped up, another end face is exposed, with the contact condition of compound in simulated roadway and environment, the test specimen wrapped is put into 20 DEG C, health 72h in the environmental cabinet of relative humidity 90%,
(33) by test specimen core boring sampling good for health;
Described emulsifying agent optimum condition is for meet simultaneously: A, cohesion are greater than 180g/cm
2early strength is qualified, and is more applicable to quick open to traffic more greatly; B, Cold Recycled Mixture with Emulsified Asphalt are less than this operable time from production to the time needed for construction rolling, and transportation stability is qualified; C, to take out complete core be that globality is qualified.
In described step (11), cylinder specimen diameter is 150mm, and mixture quality is 3kg, and height of specimen is 75 ± 2mm.
Described compound A is that 45kg, part A expect for 1kg, the S time is 30 minutes.
Described test specimen 1,2,3,4 ... n adopts gyratory compaction legal system standby, and number of revolutions is 20 times, adopts end face diameter to be the die trial of 100mm.
In described step (31), cylinder specimen diameter is 150mm.
Test method provided by the invention can the cold renewal emulsifying agent of preferably different construction and application conditions.
Preferred principle of the present invention and EMBODIMENTS OF THE INVENTIONIn:
Technological difficulties and evaluation method in table 1 emulsified asphalt cold renewal implementation process
The control research of the key links such as emulsifying agent is preferred, emulsified asphalt production, final purpose is the Cold Recycled Mixture with Emulsified Asphalt in order to excellent, therefore, the present invention is from the angle of compound, propose evaluation test method and the standard of each respective performances of Emulsified Asphalt Mixture, the emulsifying agent carried out based on mixture performance is preferred.
Choose certain emulsifying agent and make emulsified asphalt, emulsified asphalt performance should be able to meet " asphalt highway regeneration techniques specification " (JTGF41-2008) shows the related request of 4.3.1.According to design grating, the mineral aggregate mixing Cold Recycled Mixture with Emulsified Asphalt adopting engineering reality to use, determines transportation stability, early strength, the globality of the Cold Recycled Mixture with Emulsified Asphalt corresponding to this emulsifying agent by following steps.Again according to engineering physical condition (haul distance, open to traffic time, health-preserving condition etc.), carry out emulsifying agent preferably, thus optimize the monomer emulsifying agent or composite emulsifier that are applicable to this kind of mineral aggregate and engineering specifications.
1, early strength
State desired by emulsified asphalt cold renewal engineering is that the breakdown of emulsion time is longer, but once breakdown of emulsion can form intensity very soon.Higher early strength is not only the guarantee be open to traffic, and also reflects the final strength of Cold Recycled Mixture with Emulsified Asphalt to a certain extent.The major influence factors of Emulsified Asphalt Mixture early strength is emulsifying agent de-emulsification speed, and therefore, early strong test is the important indicator selecting emulsifying agent, adopts cohesion test evaluation Cold Recycled Mixture with Emulsified Asphalt early strength.
Test procedure is as follows:
(1) according to target mix design result mixing Cold Recycled Mixture with Emulsified Asphalt, gyratory compaction molding diameter is the cylinder specimen of 150mm, and mixture quality is about 3kg, and height of specimen is 75 ± 2mm.
(2) be 20 DEG C by institute's shaping test piece in temperature, health 4h in the constant-temp. and-moisture maintenance of relative humidity 90%, health terminates rear reference Zhengzhou University master thesis " hgh-performance emulsified pitch cold in-plant recycling Mixture Design Method research " and carries out cohesion test immediately.
2, transportation stability
(1) according to target mix design result mixing Cold Recycled Mixture with Emulsified Asphalt about 45kg, get the shaping gyratory compaction test specimen of the good compound of 1kg mixing, adopt end face diameter to be the die trial of 100mm, number of revolutions is 20 times, by stand-by for all the other compound plastic bag sealings.
(2) at interval of 0.5h, get the shaping gyratory compaction test specimen of Emulsified Asphalt Mixture of 1kg sealing, end face diameter is adopted to be the die trial of 100mm, number of revolutions is 20 times, each time point should at least carry out three parallel experiments, molding time is greater than Practical Project haulage time or height of specimen when significantly increasing, and stops shaping.
(3) institute's shaping test piece and not shaping loose Cold Recycled Mixture with Emulsified Asphalt are put into 60 DEG C of ventilated drying oven health 48h.
(4) the Cold Recycled Mixture with Emulsified Asphalt test specimen after health is taken out, to be cooledly to room temperature, measure its bulk density ρ by water weight method
n; Loose Cold Recycled Mixture with Emulsified Asphalt after health is taken out and tests its theoretical maximum specific density ρ.
(5) Cold Recycled Mixture with Emulsified Asphalt test specimen voidage V is calculated
n, V
n=(1-ρ
n/ ρ) × 100%, and draw test specimen voidage with molding time change curve.According to " asphalt highway regeneration techniques specification " requirement, Cold Recycled Mixture with Emulsified Asphalt voidage scope is 9 ~ 14%, therefore reading the molding time maximal value of test specimen voidage <14% from curve, is Cold Recycled Mixture with Emulsified Asphalt operable time S
w.
Initial stage does not have breakdown of emulsion due to emulsified asphalt, and Cold Recycled Mixture with Emulsified Asphalt has good mobility and rammability, and therefore voidage increases without significant change with molding time; Along with molding time increases gradually, emulsified asphalt is breakdown of emulsion gradually, and compound forms intensity and is difficult to compacting, and voidage significantly rises with molding time increase; When total molding time is greater than operable time, Cold Recycled Mixture with Emulsified Asphalt voidage is difficult to reach within the scope of normal voidage, and shaping mixture performance declines to a great extent.Should ensure that Cold Recycled Mixture with Emulsified Asphalt is less than this operable time from production to the time needed for construction rolling, otherwise Cold Recycled Mixture with Emulsified Asphalt will form intensity by breakdown of emulsion in transportation, thus cause being difficult to unload or be difficult to compacting, institute's making emulsified asphalt cold renewal layer quality cannot meet the demands.Test method provided by the invention can effectively determine Cold Recycled Mixture with Emulsified Asphalt operable time, thus judges its transportation stability.
3, globality
After making emulsified asphalt cold renewal layer, need through certain preserving period, make the moisture content in compound scatter and disappear thus form intensity.But due to the factor of weather and structure, the moisture content in Cold Recycled Mixture with Emulsified Asphalt often fails to scatter and disappear in time, if the weather conditions between preserving period be cloudy day, rainy, or road both sides have house and trees to block.Now, the strength derived value of Cold Recycled Mixture with Emulsified Asphalt is more slow, and globality is poor, and compound is very easily loose, and this has not only delayed open to traffic, making upper layer, and a large amount of moisture content simultaneously residued in road surface also can impact compound long-term behaviour.
Under evaluating the disadvantageous situation of health-preserving condition, different emulsifiers on the impact of Emulsified Asphalt Mixture globality and strength derived value speed, design coring test, test procedure is as follows:
(1) according to target mix design result mixing Cold Recycled Mixture with Emulsified Asphalt, gyratory compaction molding diameter is the cylinder specimen of 150mm, and height of specimen is equal with institute's making emulsified asphalt cold renewal layer thickness in engineering.
(2) the test specimen surrounding of forming and an end face plastic sheeting are wrapped up, another end face is exposed, with the contact condition of compound in simulated roadway and environment.The test specimen wrapped is put into 20 DEG C, health 72h in the environmental cabinet of relative humidity 90%.
(3) by test specimen core boring sampling good for health, core end face diameter is 100mm, is qualified can take out complete core.
Sum up the performance of compound corresponding to each emulsifying agent, judge the applicable elements of this compound, for the application conditions of emulsified asphalt cold renewal engineering, optimize the emulsifying agent being applicable to long-distance transportation, the fast situation such as open to traffic, health-preserving condition unfavorable (overcast and rainy or road both sides have trees to block).
Beneficial effect: the method for cold renewal emulsifying agent method for optimizing for proposing for the technological difficulties in the application of emulsified asphalt cold recycling technology based on mixture performance provided by the invention, the emulsified asphalt produced by the method can meet the every demand in production, construction and use procedure, thus ensures the smooth enforcement of emulsified asphalt cold recycling technology.And properties test for for compound propose, test findings and engineering desired properties tight ness rating high, can truly reflect compound practical situations.
Cold renewal based on mixture performance emulsifying agent method for optimizing, accurately and reliably, test method is comparatively simple, and equipment requirement is not high, and operating process is easy for test figure, is beneficial to test method and promotes.
Inventor this method for optimizing has been tried out in system in Beijing Jing open high speed bypass overhaul engineering, G107 national highway overhaul engineering, West China road, Pinggu engineering, information road, Haidian, Tuan Zhong road etc., Daxing ten remainder engineerings emulsifying agent preferably in, current respective stretch pavement usage is all right, illustrates that the present invention is rational, reliable, practical.
Accompanying drawing explanation
Fig. 1 voidage is with molding time change curve.
Embodiment
Below in conjunction with embodiment, the present invention is described in further details.
Embodiment 1 monomer emulsifying agent is preferred:
When monomer emulsifying agent produces emulsified asphalt, matrix pitch used for Qinhuangdao AH-70 pitch and the emulsified asphalt produced to mineral aggregate to wrap effect all better.
1, early strength
State desired by emulsified asphalt cold renewal engineering is that the breakdown of emulsion time is longer, but once breakdown of emulsion can form intensity very soon.Higher early strength is not only the guarantee be open to traffic, and also reflects the final strength of Cold Recycled Mixture with Emulsified Asphalt to a certain extent.The major influence factors of Emulsified Asphalt Mixture early strength is emulsifier, and therefore, early strong test is also the important indicator selecting emulsified asphalt formula, adopts cohesion test evaluation Cold Recycled Mixture with Emulsified Asphalt early strength.
Test procedure is as follows:
(1) according to target mix design result mixing Cold Recycled Mixture with Emulsified Asphalt, gyratory compaction molding diameter is the cylinder specimen of 150mm, and mixture quality is about 3kg, and height of specimen is 75 ± 2mm.
(2) be 20 DEG C by institute's shaping test piece in temperature, health 4h in the constant-temp. and-moisture maintenance of relative humidity 90%, health terminates rear reference Zhengzhou University master thesis " hgh-performance emulsified pitch cold in-plant recycling Mixture Design Method research " and carries out cohesion test immediately.
Early strength test findings is as shown in the table.
Cold Recycled Mixture with Emulsified Asphalt early strength test findings corresponding to each monomer emulsifying agent of table 2
As can be seen from the test results, compound early strength sequence corresponding to each monomer emulsifying agent is: F>G>E>DGreatT. GreaT.GTC>B>A, basic consistent with de-emulsification speed, emulsifier type or de-emulsification speed are described, early strength is had a significant impact.Cohesion should be greater than 180g/cm
2, from early strength angle, answer preferred emulsifier C, D, E, F, G.
2, transportation stability
(1) according to target mix design result mixing Cold Recycled Mixture with Emulsified Asphalt about 45kg, get the shaping gyratory compaction test specimen of the good compound of 1kg mixing, adopt end face diameter to be the die trial of 100mm, number of revolutions is 20 times, by stand-by for all the other compound plastic bag sealings.
(2) at interval of 0.5h, get the shaping gyratory compaction test specimen of Emulsified Asphalt Mixture of 1kg sealing, end face diameter is adopted to be the die trial of 100mm, number of revolutions is 20 times, each time point should at least carry out three parallel experiments, molding time is greater than Practical Project haulage time or height of specimen when significantly increasing, and stops shaping.
(3) institute's shaping test piece and not shaping loose Cold Recycled Mixture with Emulsified Asphalt are put into 60 DEG C of ventilated drying oven health 48h.
(4) the Cold Recycled Mixture with Emulsified Asphalt test specimen after health is taken out, to be cooledly to room temperature, measure its bulk density ρ by water weight method
n; Loose Cold Recycled Mixture with Emulsified Asphalt after health is taken out and tests its theoretical maximum specific density ρ.
(5) Cold Recycled Mixture with Emulsified Asphalt test specimen voidage V is calculated
n, V
n=(1-ρ
n/ ρ) × 100%, and draw test specimen voidage with molding time change curve, as shown in Figure 1, the compound wherein corresponding to each monomer emulsifying agent is designated as A, B, C, D, E respectively.According to " asphalt highway regeneration techniques specification " requirement, Cold Recycled Mixture with Emulsified Asphalt voidage scope is 9 ~ 14%, therefore reading the molding time maximal value of test specimen voidage <14% from curve, is Cold Recycled Mixture with Emulsified Asphalt operable time S
w.See Fig. 1.
Transportation stability test findings is as shown in the table.
Table 3 transportation stability test findings
From data in table, the Cold Recycled Mixture with Emulsified Asphalt transportation stability corresponding to emulsifying agent C, D is qualified.
3, globality
(1) according to target mix design result mixing Cold Recycled Mixture with Emulsified Asphalt, gyratory compaction molding diameter is the cylinder specimen of 150mm, and height of specimen is equal with institute's making emulsified asphalt cold renewal layer thickness in engineering.
(2) the test specimen surrounding of forming and an end face plastic sheeting are wrapped up, another end face is exposed, with the contact condition of compound in simulated roadway and environment.The test specimen wrapped is put into 20 DEG C, health 72h in the environmental cabinet of relative humidity 90%.
(3) by test specimen core boring sampling good for health, core end face diameter is 100mm, is qualified can take out complete core.
Integrality test result is as shown in the table.
Table 4 integrality test result
From data in table, when emulsified asphalt cold renewal engineering health-preserving condition is unfavorable, preferred emulsifier D, E, F, G emulsified asphalt can be produced.
From combination property, the emulsified asphalt that mentioned emulsifier D produces can meet the every demand in production, construction and use procedure.
Embodiment 2
Composite emulsifier is preferred:
Composite emulsifier optimization test result for different substrates pitch (Qinhuangdao AH-70 matrix pitch, Binzhou AH-70 matrix pitch, Zhenghai AH-70 matrix pitch) (being commercially available) is as shown in the table.Wherein, the emulsified asphalt adopting RH-1 type composite emulsifier to produce is designated as emulsified asphalt 1, RH-2 ~ RH-9 in like manner; Emulsified asphalt 1,2,3 adopts Qinhuangdao AH-70 matrix pitch to produce, and emulsified asphalt 4,5,6 adopts Binzhou AH-70 matrix pitch to produce, and emulsified asphalt 7,8,9 adopts Zhenghai AH-70 matrix pitch to produce.
Table 5 is for Qinhuangdao AH-70 matrix pitch emulsifying agent preferred result
Table 6 is for Binzhou AH-70 matrix pitch emulsifying agent preferred result
Table 7 is for Zhenghai AH-70 matrix pitch emulsifying agent preferred result
In engineer applied, if mineral aggregate reclaims old material and matrix pitch character changes, even if use same monomer emulsifying agent or composite emulsifier, also emulsifying agent should be re-started preferred.
Test findings shows, the emulsified asphalt that mentioned emulsifier and pitch are mixed to get is all qualified.When transportation range is longer, can preferred emulsified asphalt 1,4,7; When must fast open to traffic time, can preferred emulsified asphalt 2,5,8; When health-preserving condition is unfavorable, can preferred emulsified asphalt 3,6,9.
Each emulsified asphalt Indexs measure result is as shown in table 8 ~ 17, and result as can be seen from table, the performance index of each emulsified asphalt all meet code requirement.
Comprehensive above test findings, can find out the emulsified asphalt that monomer emulsifying agent D+ Qinhuangdao AH-70 produces and the emulsified asphalt that nine kinds of composite emulsifiers for three kinds of matrix pitches are produced all qualified, and corresponding compound meets the performance requirement under corresponding implementation condition, can be applied in engineering as cold renewal emulsified asphalt.
The emulsified asphalt performance index testing result that table 8 monomer emulsifying agent D+ Qinhuangdao AH-70 produces
Table 9 emulsified asphalt 1 performance index testing result
Table 10 emulsified asphalt 2 performance index testing result
Table 11 emulsified asphalt 3 performance index testing result
Table 12 emulsified asphalt 4 performance index testing result
Table 13 emulsified asphalt 5 performance index testing result
Table 14 emulsified asphalt 6 performance index testing result
Table 15 emulsified asphalt 7 performance index testing result
Table 16 emulsified asphalt 8 performance index testing result
Table 17 emulsified asphalt 9 performance index testing result
This test method tried out open the engineerings such as high speed bypass overhaul engineering, West China road, Pinggu engineering, G107 national highway overhaul engineering in system in Beijing Jing emulsifying agent preferably in, current respective stretch pavement usage is all right, illustrates that test method of the present invention is rational, reliable, practical.
Claims (5)
1., based on the cold renewal emulsifying agent method for optimizing of mixture performance, comprise the steps: that (1) measures early strength, (2) measure transportation stability, and (3) measure globality, and (4) emulsifying agent characteristic is preferred;
The assay method of described early strength is:
(11) according to target mix design result mixing Cold Recycled Mixture with Emulsified Asphalt, gyratory compaction molding is adopted to prepare cylinder specimen,
(12) be 20 DEG C by institute's shaping test piece in temperature, health 4h in the constant-temp. and-moisture maintenance of relative humidity 90%, health terminates rear reference Zhengzhou University master thesis " hgh-performance emulsified pitch cold in-plant recycling Mixture Design Method research " and carries out cohesion test determination immediately;
The assay method of described transportation stability is:
(21) according to target mix design result mixing Cold Recycled Mixture with Emulsified Asphalt A, get part A material and make shaping test piece 1, timing starts to be zero, and remaining A expects that plastic bag sealing is stand-by,
(22) at interval of the S time, identical method is adopted, the test specimen 2,3,4 of preparation equal in quality ... n, described n are positive integer,
(23) to complete n test specimen time total molding time be greater than when Practical Project haulage time or height of specimen significantly increase and stop,
(24) by institute's shaping test piece 1,2,3,4 ... ventilated drying oven health put into by n and not shaping remaining A material, and described health is leave standstill 48h in 60 DEG C of ventilated drying ovens,
(25) by test specimen after health 1,2,3,4 ... n takes out, and to be cooledly to room temperature, measures its bulk density ρ respectively by water weight method
n; Remaining A material after health is taken out and tests its theoretical maximum specific density ρ,
(26) calculation testing piece voidage V
n, V
n=(1-ρ
n/ ρ) × 100%, and draw test specimen voidage with molding time change curve, according to " asphalt highway regeneration techniques specification " requirement, Cold Recycled Mixture with Emulsified Asphalt voidage scope is 9 ~ 14%, therefore reading the molding time maximal value of test specimen voidage <14% from curve, is Cold Recycled Mixture with Emulsified Asphalt operable time S
w;
Described globality assay method is:
(31) according to target mix design result mixing Cold Recycled Mixture with Emulsified Asphalt, gyratory compaction molding prepares cylinder specimen, and height of specimen is equal with institute's making emulsified asphalt cold renewal layer thickness in engineering,
(32) the test specimen surrounding of forming and an end face plastic sheeting are wrapped up, another end face is exposed, with the contact condition of compound in simulated roadway and environment, the test specimen wrapped is put into 20 DEG C, health 72h in the environmental cabinet of relative humidity 90%,
(33) by test specimen core boring sampling good for health;
Described emulsifying agent optimum condition is for meet simultaneously: A, cohesion are greater than 180g/cm
2early strength is qualified, and is more applicable to quick open to traffic more greatly; B, Cold Recycled Mixture with Emulsified Asphalt are less than this operable time from production to the time needed for construction rolling, and transportation stability is qualified; C, to take out complete core be that globality is qualified.
2. method for optimizing according to claim 1, in described step (11), cylinder specimen diameter is 150mm, and mixture quality is 3kg, and height of specimen is 75 ± 2mm.
3. method for optimizing according to claim 1, described compound A is 45kg, part A material for 1kg, the S time is 30 minutes.
4. method for optimizing according to claim 1, described test specimen 1,2,3,4 ... n adopts gyratory compaction legal system standby, and number of revolutions is 20 times, adopts end face diameter to be the die trial of 100mm.
5. method for optimizing according to claim 1, in described step (31), cylinder specimen diameter is 150mm.
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| CN113176177B (en) * | 2021-04-14 | 2024-05-31 | 武汉理工大学 | Optimized method for emulsified asphalt for cold-mix asphalt mixture based on rheological property |
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