CN101788439B - Method for detecting effective regeneration rate of aged bitumen in thermal regeneration of bituminous pavement - Google Patents
Method for detecting effective regeneration rate of aged bitumen in thermal regeneration of bituminous pavement Download PDFInfo
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- CN101788439B CN101788439B CN2010101212076A CN201010121207A CN101788439B CN 101788439 B CN101788439 B CN 101788439B CN 2010101212076 A CN2010101212076 A CN 2010101212076A CN 201010121207 A CN201010121207 A CN 201010121207A CN 101788439 B CN101788439 B CN 101788439B
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Abstract
The invention provides a method for detecting the effective regeneration rate of aged bitumen in thermal regeneration of a bituminous pavement, which is characterized by comprising the following steps: 1, typically sampling aged bituminous mixture and determining a filler-bitumen ratio a; 2, calculating the mass of the aged bitumen in the aged bituminous mixture ma and preheating; 3, preheating new aggregate with the mass of m1; 4, preheating new bitumen with the mass of ma; 5, blending the aged bituminous mixture and the new aggregate and then adding the new bitumen for blending; 6, separating the new aggregate and weighing the mass m2 of the new aggregate; 7, detecting the mass mp of mineral powder on the surface of the new aggregate and the mass of bitumen mb; and 8, calculating the effective regeneration rate of the aged bitumen in the aged bituminous mixture according to the following formula: P=2*mp/a/mb*100 percent. The test method provided by the invention can effectively solve the problem that the effective regeneration content of the aged bitumen in the aged bituminous mixture in the thermal regeneration process cannot be accurately evaluated, and provides a favorable basis for design of thermal regeneration process conditions, and quality evaluation.
Description
Technical field
The present invention is that a kind of effective evaluation bituminous pavement aged asphalt compound that is used for is used for the aged asphalt content detecting method that when regeneration heat can be utilized by effective regeneration, the utilization ratio that can reflect aged asphalt in the reclaimed asphalt mixture accurately, thereby help to judge the regeneration effect of reclaimed asphalt mixture and the selection of technological condition of regeneration rationally, belong to asphalt highway regeneration techniques field.
Background technology
Since the big highway in Shen in 1988 was open to the traffic, China's highway developed at a speed unheard of before.By the end of the year 2008, the highway mileage open to traffic has broken through 60,000 kilometers, occupies the second place of the world, and wherein bituminous pavement has occupied the ratio more than 90%.According to national highway development plan, China will build up 8.5 ten thousand kilometers highways in the end of the year 2010, form perfect national freeway net at the year two thousand twenty.Yet compare with external advanced country road state of development, China's expressway construction is started late, and a little less than the technical foundation relative thin, is subjected to economic fast development needs, has caused technological sophistication to relatively lag behind in the situation of construction speed to a certain extent.Simultaneously because traffic climate condition and management level and abroad have than big-difference, China's road structure form and behaviour in service all present the comparison salient feature.
Although China's bituminous pavement designed life be 15 years, the part road surface has just occurred early disease in various degree in operation after 2～3 years, and most of heavy traffic asphaltum road surface after operation 5～6 years, just enters large tracts of land maintenance and transformation phase in long 7～8 years.Therefore, with regard to the present actual state of China, highway not only entered a lasting extensive maintenance phase, and in a very long time, the control of early disease must be paid attention to also when rapidly building.
It is estimated, from now on China has 12% asphalt mat to overhaul every year approximately, and conventional method for maintaining is the old asphalt pavement milling to be discarded overlay new bituminous pavement again, therefore, the useless asphalt that annual only road crust is overhauled generation has just reached about 2,200,000 tons, and this numeral also will be with annual 15% speed increment.These discarded old asphalt mixtures not only take a large amount of soils, but also can cause the pollution of ecologic environment.Meanwhile, also need to produce the new asphalt of a large amount of high-qualitys, expend a large amount of construction funds in order to substitute discarded old asphalt mixture.And no matter be from gathering materials or from the pitch angle; China's bituminous pavement all has good regeneration and is worth; therefore; if can realize the highly efficient regeneration utilization of old asphalt mixture; the application of 2,200,000 tons of only annual discarded top layer compounds just can directly be saved fee of material and be reached 400,000,000 yuan, can not only economize on resources greatly, alleviates highway and builds the foster contradiction that lacks of capital; can preserve the ecological environment simultaneously, meet the trend of the times of present sustainable development.
The asphalt surface hot reproduction technology is by thermoplastic, the old material in mechanically scarifying (fragmentation) road surface, then according to the design needs, add regenerant, new asphalt and the outer adjuvant etc. of mixing that needs, carry out again heat and mix and stir, and with the reclaimed asphalt mixture that the forms compacting that paves, thereby reach the utilization again of aged asphalt compound, eliminate original pavement disease, recover the road maintenance maintenance process of Pavement Performance.Compare with traditional maintenance technology, it is big that hot regeneration techniques not only has cost savings, the economic environment advantage that the environmental protection coefficient is high, design proper reclaimed asphalt mixture simultaneously and have the pavement performance of not failing fully in newly mixing asphalt, therefore hot regeneration techniques has obtained extensive attention both domestic and external and has applied, although the hot regeneration techniques of China is started late relatively, the technical research focus and emphasis that has become the maintenance of surface maintenance is now applied one of technology.
Although all carried out in a large number research targetedly at hot regeneration techniques Chinese scholars and research institution, also in actual engineering, accumulated abundant engineering application experience, but still there is certain controversial in the usability for heat regeneration asphalt mixture, and the engineering of heat regeneration asphalt mixture is applied to power and still is lower than and newly mixes asphalt.Although and the reason that causes this phenomenon is many-sided, it is exactly one of basic influence factor of its key that the effective regeneration utilization factor of aged asphalt in the hot regenerating mixture is familiar with deficiency.Even the regeneration techniques development early, the ripe relatively perfect U.S. of technical system, in its regeneration techniques guide, also be based on aged asphalt can be fully and regenerant or new pitch merge, also be the performance design that reclaimed asphalt mixture is carried out in supposition that aged asphalt can reach very regeneration.Yet increasing correlative study and engineering practice have all proposed query to this, very the aged asphalt of aged asphalt compound is extracted the back on the basis of regeneration at the supposition aged asphalt and under heating condition, evenly stir the regeneration asphalt sample that the back obtains, with the shear agitation power that relies on machinery in the practical engineering application aged asphalt that sticks to surface of aggregate with the asphalt membrane state in regenerant or new pitch and the aged asphalt compound and exist is carried out the miscible regeneration asphalt that obtains and have suitable difference with regenerant or new pitch.Especially when regenerant or new pitch can't be even when miscible with the aged asphalt film, aged asphalt just can't obtain regeneration very, therefore the performance obtained of indoor regeneration asphalt performance test just can't reflect the time of day and the performance of the regeneration asphalt film in the reclaimed asphalt mixture fully really, and this also is to cause reclaimed asphalt mixture engineering application performance and shop experiment to design the one of the main reasons of generation than big-difference.
China just releases first " asphalt highway regeneration techniques standard " truly (JTGF41-2008) up in April, 2008, indicate that the asphalt highway regeneration techniques is subjected to the more and more wider attention of sending out and applies in China, but the while also illustrates regeneration techniques and starts late in China, use maturation not enough, also lack the good technical system.This technical manual itself is also pointed out just regeneration techniques have been proposed than the direction in the relative broad range, the technical foundation that also lacks at present comparative maturity, therefore, proposing to be not only at the method for testing and detecting of asphalt pavement regeneration technology necessary at China asphalt pavement regeneration state of the art, is urgent simultaneously.
To newly gather materials to mix and stir with new pitch with the production of newly mixing asphalt and compare, heat regeneration asphalt mixture has been owing to used the aged asphalt compound, and therefore, it is more complicated and changeable relatively that it mixes and stirs production run.In the aged asphalt compound, aged asphalt sticks to surface of aggregate with membrane stage, and regenerant or new pitch are follow-up adding ingredients, mainly is that mixing power and the aged asphalt by machinery spreads miscible formation regeneration asphalt.At this moment, just there is the miscible degree problem of regenerant or new pitch and aged asphalt, be exactly and the effective regeneration rate (total the aged asphalt of regeneration accounts for the percentage composition of aged asphalt) of final result reflection aged asphalt.If regenerant or new pitch and aged asphalt can't fully merge, will inevitably form the regeneration asphalt film of layering in surface of aggregate, also be regenerant or the new more skin that is present in the regeneration asphalt film of pitch, form softer regeneration asphalt layer, and the internal layer asphalt membrane remains based on aged asphalt, forms harder internal layer pitch.What really obtained regeneration this moment is outer field part aged asphalt, and the aged asphalt of internal layer does not only obtain regeneration, is on the contrary to a great extent to have also promptly so-called " black stone " effect as a part of gathering materials.The existence of " black stone " phenomenon not only can cause the reduction of regeneration effect, makes actual regeneration effect and initial design produce than large deviation simultaneously, will certainly influence the long-term pavement performance of reclaimed asphalt mixture, even produces the disease that can't expect.
The important factors that asphalt surface hot reproduction technology large-scale promotion application is restricted is exactly to lack the effective regeneration rate that feasible shop experiment method is effectively judged aged asphalt compound aged asphalt in the regenerative process at present, causes and can't make correct assessment to the reclaimed asphalt mixture Effect on Performance to the aged asphalt compound.And then can't carry out correct reclaimed asphalt mixture performance design.Yet growing along with the shortage of high-quality resource and environmental protection importance; the extensive regeneration of bituminous pavement is imperative; thereby the shop experiment method of being badly in need of a kind of simple possible can carry out analysis of experiments at the effective regeneration rate of aged asphalt, and then provides favourable foundation for the selection of hot process engineering for regenerating condition and the guarantee of adjustment and reclaimed asphalt mixture pavement performance.
Therefore, purpose of the present invention just provides a kind of shop experiment method of simple possible can be to the aged asphalt effective regeneration rate of aged asphalt compound in the asphalt surface hot reproduction process (aged asphalt that also promptly obtains regeneration with the miscible aged asphalt of regenerant or new pitch in the regenerative process accounts for the number percent of total aged asphalt), thereby provides a favorable security for the successful implementation of asphalt surface hot reproduction technology.
Summary of the invention
Technical matters: the technical problem to be solved in the present invention provides aged asphalt compound aged asphalt effective regeneration rate detection method in a kind of asphalt surface hot reproduction process, utilize Determination on content by the aged asphalt effective regeneration, can judge the utilization factor of the aged asphalt in the aged asphalt compound and process engineering for regenerating condition simply and easily to promoting the applicability and the practical effect of aged asphalt regeneration, thereby provide effective foundation for the match ratio design of heat regeneration asphalt mixture.
Technical scheme: for solving the problems of the technologies described above, the technical solution used in the present invention is:
Step 1: get broken fully and through size of mesh be aged asphalt compound after the standard sieve of 4.75mm sieves as test aged asphalt compound, and definite its Ratio of filler bitumen a;
Step 2: test aged asphalt compound sample, accurately its quality of weighing is calculated total aged asphalt quality m in the aged asphalt compound
a, preheating then, preheat temperature is consistent with the actual preheat temperature of aged asphalt compound in the actual reproduction production run;
Step 3: the particle diameter of getting oven dry is that the single of 9.5mm evenly newly gathered materials, accurately its quality of weighing m
1, preheating is newly gathered materials and is selected for use newly gathering materials of will using in the actual reproduction engineering production run, and the heating-up temperature of newly gathering materials in preheat temperature and the actual reproduction production run is consistent;
Step 4: accurately taking by weighing quality is m
aNew pitch, preheating, new pitch is selected the new pitch that will use in the actual reproduction engineering production run for use, newly the heating-up temperature of pitch is consistent in preheat temperature and the actual reproduction production run;
Step 5: in indoor compound mixer, 30～45s is mixed and stirred in newly gathering materials that aged asphalt compound sample that preheating is finished and preheating are finished, the new pitch that adds preheating again continues to mix and stir, in mixing time and the actual reproduction production run to mix and stir the production time consistent, if need to use regenerant in the process of the test, then before adding, new pitch adds, and mix and stir about 30～45s, add again new pitch continue to mix and stir with the actual reproduction production run in the identical mixing time, guarantee that simultaneously the regenerant and the gross mass of new pitch are m
a
Step 6: the cooling of compound after waiting to mix and stir will newly be gathered materials and separate from mix and stir compound, and accurately take by weighing its quality m to below 70 ℃ the time
2
Step 7: newly gather materials with the immersion of triclene solution is isolated, soaking solution is obtained wherein breeze with the glass filter paper filtering, accurately take by weighing powdered ore quality m after the oven dry
p, then the asphalt quality in the solution is m
b=(m
2-m
1-m
p);
Step 8:P=2 * m
p/ a/m
b* 100% is aged asphalt compound aged asphalt effective regeneration rate, when P=100%, illustrates that aged asphalt realized the holomorphosis utilization, when P＜100%, illustrates that aged asphalt only realized the partial regeneration utilization.
Beneficial effect: in hot regenerative process,, utilize problem with regard to the effective regeneration that has aged asphalt if new pitch or regenerant can't fully mix and stir misciblely with aged asphalt.Being reflected on the regeneration asphalt film, must be the inside and outside layering of regeneration asphalt film, and skin contains some aged asphalt and new pitch or regenerant, forms the viscid bitumen layer, and internal layer then mainly is an aged asphalt, forms the unitaite layer.Just mean that also aged asphalt only partly is reproduced utilization, exists an effective regeneration to utilize content.And not only do not reach the regeneration purpose of original aged asphalt in this case, even can have a strong impact on the pavement performance of reclaimed asphalt mixture.Therefore, be to understand aged asphalt compound regeneration actual effect to the test of aged asphalt compound aged asphalt effective regeneration rate in the hot regenerative process, improve the important step of reclaimed asphalt mixture performance design.
Effective regeneration rate of aged bitumen in thermal regeneration of bituminous pavement detection method provided by the invention, the effective regeneration utilization factor of aged asphalt in the analysis aged asphalt compound that not only can be good, help the even miscible degree of the old and new's pitch in the analgesic regenerative process simultaneously, and then can judge the applicability and the actual implementation result thereof of the hot technological condition of regeneration of selecting for use.Test figure accurately and reliably, test method is simple and feasible, be easy to test, good solution can't understand the problem of miscible degree of the old and new's pitch and aged asphalt effective regeneration rate in the past, help to improve reclaimed asphalt mixture design system and construction technology, have very good application value.
Test method of the present invention has not only been carried out effective checking by a large amount of shop experiments, be applied in the asphalt surface hot reproduction maintenance engineering of many highways simultaneously, as the asphalt surface hot reproduction maintenance engineering of Beijing-Shanghai (Beijing-Shanghai) highway Jiangsu Province Huaian section.In this maintenance engineering, utilize test method of the present invention that aged asphalt compound aged asphalt effective regeneration rate under the different heat regeneration operating technique conditions is detected and estimates, and then technological condition of regeneration has been carried out optimal design based on analysis result, effectively ensured the regeneration effect of aged asphalt compound, this hot regeneration maintenance maintenance engineering reclaimed bituminous pavement behaviour in service is good at present, has verified rationality, reliability and the practicality of test method of the present invention.
Description of drawings
Fig. 1 is that aged asphalt compound surface of aggregate aged asphalt effective regeneration rate is low excessively in the asphalt surface hot reproduction, causes aged asphalt and the inside and outside layering synoptic diagram of the asphalt membrane that newly pitch or regenerant can't be fully miscible.
Fig. 2 carries the experiment process figure of detection method for the present invention.
Fig. 3 is the application example test findings figure of detection method of the present invention.
Fig. 4 is the application example test findings figure of detection method of the present invention.
Fig. 5 is the application example test findings figure of detection method of the present invention.
Fig. 6 is the application example test findings figure of detection method of the present invention.
Embodiment
As shown in Figure 1, in the reclaimed asphalt mixture that the regeneration of aged asphalt compound heat forms, if new pitch or regenerant can't fully mix and stir miscible with old pitch, be reflected on the regeneration asphalt film on (3) surface that gathers materials, it must be the inside and outside layering of regeneration asphalt film, the aged asphalt layer that outer (1) contains new pitch or regenerant forms softer effective regeneration brea bed, and internal layer (2) then mainly is not have capable of regeneration aged asphalt, forms the unitaite layer.This phenomenon can simply characterize with this index of effective regeneration rate (being the number percent that outer field aged asphalt accounts for total aged asphalt) of aged asphalt.When aged asphalt effective regeneration rate is low, not only can't reaches original regeneration purpose, even can cause the gross differences of regenerability design, and then influence the pavement performance of reclaimed asphalt mixture.Yet in the present heat regeneration asphalt mixture design owing to lack method for testing and analyzing at this phenomenon, therefore all be that new pitch of supposition or regenerant and aged asphalt are fully miscible, this also is to cause the heat regeneration asphalt mixture design inaccurate, and then influences the major reason of reclaimed asphalt mixture service property (quality).Therefore, the invention provides a kind of effective regeneration rate of aged bitumen in thermal regeneration of bituminous pavement detection method.
Its mentality of designing of effective regeneration rate of aged bitumen in thermal regeneration of bituminous pavement detection method provided by the invention is: obtain the regeneration asphalt rubber cement by mixing and stirring of new pitch or regenerant and aged asphalt compound, and then by making the partial regeneration asphalt mastic be transferred to new surface of aggregate from aged asphalt compound surface of aggregate with mixing and stirring of newly gathering materials, and then the effective regeneration rate of aged asphalt is estimated in the test of the asphalt mastic by being transferred to new surface of aggregate.Concrete technical scheme is: simulation heat regeneration actual production conditions in the aged asphalt compound, add newly gather materials and with aged asphalt compound sample in the new pitch (comprising regenerant) of quality such as aged asphalt mix and stir test; New pitch (comprising regenerant) can be with aged asphalt rubber cement (comprising pitch and breeze) thereby miscible formation regeneration asphalt rubber cement, and the overall Ratio of filler bitumen of regeneration asphalt rubber cement then changes a/2 into by a of original aged asphalt rubber cement; Simultaneously with mixing and stirring in the process of newly gathering materials, a part of regeneration asphalt rubber cement of aged asphalt compound surface of aggregate can be transferred to new surface of aggregate; To newly gather materials and from reclaimed asphalt mixture, separate, can obtain to be transferred to the powdered ore quality m of new surface of aggregate by quality testing
pWith asphalt quality m
bBecause mixing and stirring the new pitch (comprising regenerant) that adds in the test equates with the aged asphalt quality, therefore if new pitch (comprising regenerant) has obtained to mix and stir fully miscible with aged asphalt, the mass ratio that then means in the pitch that is transferred to new surface of aggregate new pitch (comprising regenerant) and aged asphalt is 1: 1, also is that the ideal dumping amount of aged asphalt 100% regeneration should be m
b/ 2; Do not add breeze in the test owing to mixing and stirring simultaneously, the breeze of therefore new surface of aggregate is along with aged asphalt shifts from the aged asphalt rubber cement, just means that also aged asphalt is m to the actual transfer amount of new surface of aggregate
p/ a; Aged asphalt is the effective regeneration rate of aged asphalt, i.e. P=(m to the actual transfer amount of new surface of aggregate and the ratio of ideal dumping amount
p/ a)/(m
b/ 2) * 100%=2 * m
p/ a/m
b* 100%.Can reach following two purposes by test method design of the present invention:
1. pass through the calculating of aged asphalt effective regeneration rate, can understand the miscible situation of new pitch (comprising regenerant) and aged asphalt, not only can understand the regeneration effect of aged asphalt, can contrast simultaneously different new pitches or regenerant to the regeneration effect of aged asphalt, help the selection of new pitch or regenerant.
2. the design alternative by different technological condition of regeneration, can the different technological condition of regeneration of comparative analysis to the influence of aged asphalt effective regeneration rate, and then, realize the asphalt pavement regeneration effect of the best for design and the adjustment of technological condition of regeneration provides favourable foundation.
As shown in Figure 2, effective regeneration rate of aged bitumen in thermal regeneration of bituminous pavement detection method provided by the invention comprises the steps:
Step 1: getting broken is that aged asphalt compound after the standard sieve of 4.75mm sieves is as test aged asphalt compound fully and through size of mesh, and definite its Ratio of filler bitumen a, breeze content and the bitumen content of determining to determine earlier the aged asphalt compound of Ratio of filler bitumen a according to the correlation test method of " highway engineering pitch and asphalt testing regulations " JTJ 052-2000, and then calculating obtains;
Step 2: get test aged asphalt compound sample about 400～600g, accurately its quality of weighing is calculated total aged asphalt quality m in the aged asphalt compound
a, preheating then, preheat temperature is consistent with the actual preheat temperature of aged asphalt compound in the actual reproduction production run;
Step 3: getting the particle diameter of drying about 400～600g is that the single of 9.5mm evenly newly gathered materials, accurately its quality of weighing m
1Preheating, newly gather materials and select for use newly gathering materials of will using in the actual reproduction engineering production run, the heating-up temperature of newly gathering materials in preheat temperature and the actual reproduction production run is consistent, also can choose according to B.5.2 relevant regulations in " asphalt highway construction technique normalizing " JTJ F40-2004 appendix B hot-mix asphalt mixture mixing proportion design method;
Step 4: accurately taking by weighing quality is m
aNew pitch, preheating, new pitch is selected the new pitch that will use in the actual reproduction engineering production run for use, the heating-up temperature of new pitch is consistent in preheat temperature and the actual reproduction production run, also can choose according to B.5.2 relevant regulations in " asphalt highway construction technique normalizing " JTJ F40-2004 appendix B hot-mix asphalt mixture mixing proportion design method;
Step 5: in indoor compound mixer, 30～45s is mixed and stirred in newly gathering materials that aged asphalt compound sample that preheating is finished and preheating are finished, the new pitch that adds preheating again continues to mix and stir, in mixing time and the actual reproduction production run to mix and stir the production time consistent, if need to use regenerant in the process of the test, then before adding, new pitch adds, and mix and stir about 30～45s, add again new pitch continue to mix and stir with the actual reproduction production run in the identical mixing time, guarantee that simultaneously the regenerant and the gross mass of new pitch are m
a
Step 6: the cooling of compound after waiting to mix and stir will newly be gathered materials and separate from mix and stir compound, and accurately take by weighing its quality m to below 70 ℃ the time
2
Step 7: newly gather materials with the immersion of triclene solution is isolated, soaking solution is obtained wherein breeze with the glass filter paper filtering, accurately take by weighing powdered ore quality m after the oven dry
p, then the asphalt quality in the solution is m
b=(m
2-m
1-m
p);
Step 8:P=2 * m
p/ a/m
b* 100% is aged asphalt compound aged asphalt effective regeneration rate, when P=100%, illustrate that aged asphalt and new pitch comprise that regenerant realized complete miscibility, aged asphalt has obtained the holomorphosis utilization, when P＜100%, only illustrate that part aged asphalt and new pitch comprise that regenerant realized misciblely, aged asphalt has only been realized the partial regeneration utilization.
Application example: testing method of the present invention has obtained effective checking of entity project.The asphalt surface hot reproduction maintenance engineering utilization test method of the present invention of Beijing-Shanghai (Beijing-Shanghai) highway Jiangsu Province Huaian section detects and estimates the aged asphalt compound aged asphalt effective regeneration rate under the different heat regeneration operating technique conditions, and then technological condition of regeneration has been carried out optimal design based on analysis result, effectively ensured the regeneration effect of aged asphalt compound, this hot regeneration maintenance maintenance engineering reclaimed bituminous pavement behaviour in service is good at present.In this entity project, the concrete enforcement of test method of the present invention is as follows:
Step 1: engineering at first abundant to fragmentation and after the 4.75mm standard sieve sieves has been carried out typical sampling with the aged asphalt compound, and test determines that its breeze content is 6.78%, and bitumen aggregate ratio is 4.66%, so its Ratio of filler bitumen a=1.45;
Step 2: get 24 parts on aged asphalt compound sample, per three parts be one group to carry out repeated contrast test, be divided into is eight groups, wherein 25 ℃ of uses of four groups of normal temperature, other four groups all are preheated to 120 ℃ of uses, to analyze the influence of aged asphalt preheating of mixed material temperature to aged asphalt effective regeneration rate, the quality of every part of aged asphalt compound sample is 500g, then its aged asphalt quality m
aBe 23.3g;
Step 3: the engineering particle diameter of getting oven dry be 9.5mm newly gather materials 24 parts, per three parts is one group, being divided into is eight groups, all accurately takes by weighing quality m
1After be preheated to 180 ℃;
Step 4: get quality m
aBe 24 parts of the 70# pitches of engineering of 23.3g, per three parts is one group, and being divided into is eight groups, all is preheated to 160 ℃;
Step 5: in indoor compound mixer, the aged asphalt compound is mixed and stirred 30s with newly gathering materials, adding new pitch again continues to mix and stir, be the influence of the mixing time after the new pitch adding of comparative analysis to aged asphalt effective regeneration rate, mixing time after wherein four groups of new pitches add is set at 1min, and the other four groups mixing time is set at 3min; Be of the influence of comparative analysis regenerant simultaneously to aged asphalt effective regeneration rate, wherein four groups are not used regenerant, and other four groups before adding new pitch, all added 1.86g regenerant (account for aged asphalt quality 10%) earlier and mixed and stirred 30s, added the new pitch of 21.44g (the quality summation that guarantees new pitch and regenerant is 23.3g) again and continue to mix and stir;
Step 6: treat that compound cooling after each test is mixed and stirred to below 70 ℃ the time, will newly gather materials and separate, and accurately take by weighing its quality m from mix and stir compound
2
Step 7: newly gather materials with the immersion of triclene solution is isolated, soaking solution is obtained wherein breeze with the glass filter paper filtering, accurately take by weighing powdered ore quality m after the oven dry
p, be the powdered ore quality that is transferred to new surface of aggregate, then the asphalt quality in the solution is m
b=(m
2-m
1-m
p), also be the asphalt quality that is transferred to new surface of aggregate;
Step 8:P=2 * m
p/ a/m
b* 100% is aged asphalt compound aged asphalt effective regeneration rate.
In test She Ji different tests condition and corresponding aged asphalt effective regeneration rate of obtaining such as table 1 and shown in Figure 3.As shown in table 1, at the preheat temperature T of aged asphalt compound, the mixing time t after new pitch adds and whether use regenerant, eight groups of tests 1 of different tests condition have been carried out in design altogether, 2,3,4,5,6,7,8: test 1---preheat temperature T is 25 ℃, mixing time t is 1min, does not use regenerant; Test 2---preheat temperature T is 25 ℃, and mixing time t is 3min, does not use regenerant; Test 3---preheat temperature T is 120 ℃, and mixing time t is 1min, does not use regenerant; Test 4---preheat temperature T is 120 ℃, and mixing time t is 3min, does not use regenerant; Test 5---preheat temperature T is 25 ℃, and mixing time t is 1min, uses regenerant; Test 6---preheat temperature T is 25 ℃, and mixing time t is 3min, uses regenerant; Test 7---preheat temperature T is 120 ℃, and mixing time t is 1min, uses regenerant; Test 8---preheat temperature T is 120 ℃, and mixing time t is 3min, uses regenerant; Wherein three samples (1) have all been adopted in every group of test, and (2), (3) carry out replica test, and get the aged asphalt effective regeneration rate P of its mean value as this group test.
Table 1
As shown in Figure 3, the test findings of eight groups of different tests conditions (1,2,3,4,5,6,7,8) have between than evident difference, illustrate that test method of the present invention can be simulated preferably to distinguish different test conditions, obtain the good test findings of reflection test condition influence.From its overall variation tendency as can be seen, when the not preheating of aged asphalt compound (25 ℃), mixing time t lacks (1min), and when not using regenerant, the effective regeneration rate of aged asphalt is minimum, has only about 30%, and regeneration effect is relatively poor; And the raising of aged asphalt preheating of mixed material temperature T, the prolongation of mixing time t, and the use of regenerant, all can effectively improve the effective regeneration rate of aged asphalt, when reaching optimum test condition, promptly aged asphalt preheating of mixed material temperature T is 120 ℃, mixing time t is 3min, when using regenerant simultaneously, the effective regeneration rate of aged asphalt can be increased to about 85%, has been more satisfactory regeneration effect.
As shown in Figure 4, when the preheat temperature T of aged asphalt compound was promoted to 120 ℃ by 25 ℃, the average effective regeneration rate of aged asphalt can increase about 20%.
As shown in Figure 5, when mixing time t was promoted to 3min by 1min, the average effective regeneration rate of aged asphalt can increase about 20%.
As shown in Figure 6, the situation (N) of regenerant is not used in contrast, and the use of regenerant (Y) can make the average effective regeneration rate of aged asphalt increase about 20%.
Test findings based on test method of the present invention, can sum up judgement, in heat regeneration actual production process, the raising of aged asphalt preheating of mixed material temperature, the prolongation of reclaimed asphalt mixture mixing time and the use that can soften the regenerant of aged asphalt can both effectively promote the miscible of aged asphalt and new pitch or regenerant, thereby play the effect that improves aged asphalt effective regeneration rate, can be considered as the three-favour condition of regenerating and producing.And the three-favour condition influence degree to aged asphalt effective regeneration rate is suitable substantially separately, therefore, in the actual reproduction production run, should create conditions as far as possible and use the three-favour condition simultaneously, even realize the three-favour condition simultaneously more at need, also must ensure wherein effective enforcement of two advantages.
Based on the test findings of the present invention's test, this entity project has been carried out rational heat regeneration construction technology optimal design, has effectively ensured engineering construction quality, and this entity project reclaimed bituminous pavement operating position is good.The entity project application example shows, effective regeneration rate of aged bitumen in thermal regeneration of bituminous pavement detection method provided by the invention, data accurately and reliably, easy to operate feasible, be easy to realize, the regeneration effect that can accurately reflect different heat regeneration construction technology conditions, thereby for the selection and the design of heat regeneration construction technology condition provides reliable basis, and then ensure good construction quality.Therefore, method for testing and detecting of the present invention has very good application and popularization value.
Claims (1)
1. an effective regeneration rate of aged bitumen in thermal regeneration of bituminous pavement detection method is characterized in that this method comprises the steps:
Step 1: get broken fully and through size of mesh be aged asphalt compound after the standard sieve of 4.75mm sieves as test aged asphalt compound, and definite its Ratio of filler bitumen a;
Step 2: get test aged asphalt compound sample, accurately its quality of weighing is calculated total aged asphalt quality m in the aged asphalt compound
a, preheating then, preheat temperature is consistent with the actual preheat temperature of aged asphalt compound in the actual reproduction production run;
Step 3: the particle diameter of getting oven dry is that the single of 9.5mm evenly newly gathered materials, accurately its quality of weighing m
1, preheating is newly gathered materials and is selected for use newly gathering materials of will using in the actual reproduction engineering production run, and the heating-up temperature of newly gathering materials in preheat temperature and the actual reproduction production run is consistent;
Step 4: accurately taking by weighing quality is m
aNew pitch, preheating, new pitch is selected the new pitch that will use in the actual reproduction engineering production run for use, newly the heating-up temperature of pitch is consistent in preheat temperature and the actual reproduction production run;
Step 5: in indoor compound mixer, newly gathering materials that aged asphalt compound sample that preheating is finished and preheating are finished mixed and stirred, the new pitch that adds preheating again continues to mix and stir, mix and stir in production time and the actual reproduction production run to mix and stir the production time consistent, if need to use regenerant in the process of the test, then before adding, new pitch adds, and mix and stir, add again new pitch continue to mix and stir with the actual reproduction production run in identical mixing and stirring the production time, guarantee that simultaneously the regenerant and the gross mass of new pitch are m
a
Step 6: the cooling of compound after waiting to mix and stir will newly be gathered materials and separate from mix and stir compound, and accurately take by weighing its quality m to below 70 ℃ the time
2
Step 7: newly gather materials with the immersion of triclene solution is isolated, soaking solution is obtained wherein breeze with the glass filter paper filtering, accurately take by weighing powdered ore quality m after the oven dry
p, then the asphalt quality in the solution is m
b=(m
2-m
1-m
p);
Step 8:P=2 * m
p/ a/m
b* 100% is aged asphalt compound aged asphalt effective regeneration rate, when P=100%, illustrates that aged asphalt realized the holomorphosis utilization, when P＜100%, illustrates that aged asphalt only realized the partial regeneration utilization.
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| CN102926308B (en) * | 2012-11-02 | 2015-12-02 | 华侨大学 | The control method of pitch thermal regeneration device drying system and detection, control system |
| CN105716999B (en) * | 2016-04-14 | 2018-04-03 | 河海大学 | A kind of reclaimed asphalt mixture regenerative agent diffuser efficiency evaluation method |
| CN107219147B (en) * | 2017-06-09 | 2020-02-07 | 交通运输部公路科学研究所 | Method for evaluating heat resistance test of road fiber |
| CN107976389B (en) * | 2017-10-09 | 2020-07-24 | 淮阴工学院 | Method for measuring effective regeneration rate of old material in thermal regeneration asphalt mixture |
| CN109085073B (en) * | 2018-07-18 | 2021-09-14 | 北京建筑大学 | New and old asphalt mixing degree characterization method based on dynamic modulus of mixture |
| CN111122725A (en) * | 2019-12-19 | 2020-05-08 | 扬州大学 | Ageing asphalt performance recovery evaluation method |
| CN112082895B (en) * | 2020-09-18 | 2021-09-21 | 山东大学 | Method for determining effective recovery rate of old asphalt and correcting consumption of new asphalt |
| CN114544389B (en) * | 2022-01-12 | 2023-09-15 | 中路交科检测技术有限公司 | Evaluation method for regeneration efficiency of asphalt regenerant |
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| JP2972543B2 (en) * | 1995-02-20 | 1999-11-08 | 田中鉄工株式会社 | Asphalt pavement waste material recycling device |
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