CN101900719B - Method for detecting mixing dispersity of original bituminous pavement mixture in on-site heat recovery process - Google Patents
Method for detecting mixing dispersity of original bituminous pavement mixture in on-site heat recovery process Download PDFInfo
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Abstract
The invention provides a method for detecting mixing dispersity of original bituminous pavement mixture in on-site heat recovery process. The invention is characterized in that the method includes the following steps: step one, pavement material is taken; step two, mixing test is carried out on original bituminous pavement mixture; step three, preheated mineral powder is added and mixing is carried out again; step four, cooling is carried out, and then screening is carried out, so as to obtain unit screening rate Pio; step five, newly mixed bituminous mixture is produced according to bitumen-aggregate ratio and gradation of the original bituminous pavement mixture; step six, preheated mineral powder is added and mixing is carried out again; step seven, cooling is carried out, and then screening is carried out, so as to obtain unit screening rate Pin; step eight, the difference between the unit screening rates of the original bituminous pavement mixture and the newly mixed bituminous pavement mixture at each standard screening level is calculated. The test method provided by the invention can effectively solve the problem that mixing dispersion effect of pavement mixture in the existing bituminous pavement on-site heat recovery process can not be accurately evaluated, thus providing beneficial basis for design and optimization of on-site heat recovery construction technological condition.
Description
Technical field
The present invention a kind ofly mixes and stirs dispersed method for effective evaluation road surface compound, especially a kind of method that dispersion effect can't accurate evaluation of mixing and stirring that easily solves the hot regenerative process of present Bituminous Pavement Central Plains pavement asphalt mixture belongs to asphalt highway regeneration techniques field.
Background technology
Since the large 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 Expressway Development planning, 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 Development situation, 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 to a certain extent technological sophistication to relatively lag behind in the situation of construction speed.While is due to traffic climate condition and management level and larger difference is abroad arranged, and China's road structure form and behaviour in service all present the comparison salient feature.
Although China's bituminous pavement design life-span is 15 years, the part road surface early disease in various degree just occurred in 2～3 years afterwards in operation, and most of heavy traffic asphalt pavement after operation 5～6 years, just entered 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 within 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 approximately has 12% asphalt mat to overhaul every year, and conventional method for maintaining is the old asphalt pavement milling to be discarded overlay new bituminous pavement again, therefore, often be only road crust and overhaul the useless asphalt of generation and just reached approximately 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 in order to substitute discarded old asphalt mixture, expend a large amount of construction funds.And be no matter 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 top layer compounds only discarding every year just can directly be saved fee of material and be reached 400,000,000 yuan, can not only greatly economize on resources, and 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.
Hot Recycling Techniques for Asphalt Pavement in Site refers on original bituminous pavement by thermoplastic, the old material in mechanically scarifying (fragmentation) road surface, add as required pitch, regenerant, new compound or the new aggregate of some, then carrying out heat mixes and stirs, and with the compacting that again paves of formed regenerating mixture scene, thereby reach the road maintenance process of eliminating pavement disease, recovering Pavement Performance.Compare with other maintenance technologies, the on-site heat regeneration technology can be directly on the spot the disposable road surface of completing repair, not only reached the very utilization of old material, the transportation that need not old material is discarded, has cost savings large, the characteristics that the environmental protection coefficient is high, also have simultaneously speed of application fast, the duration is short, and open to traffic early, construction to advantages such as the interference of traffic are little, is the most effective the most direct technical approach that road table function venereal disease evil is repaired.Based on the present pavement disease characteristics of China, the functional disease of road table has occupied sizable ratio, and the early disease on road surface is also a very important important phenomenon simultaneously.And based on the bituminous pavement development trend of Asphalt Pavement Abroad application experience and China, along with bituminous pavement is built and administrative skill constantly perfect, the Long Life Asphalt Pavement developing direction that is inevitable, also namely in afterwards service life of road surface process, pavement structure and material all can be in more stable state, only need in use to carry out maintenance to wearing away road table material.Therefore, be no matter present stage damage repair needs or the demand of long-range technical development, to the research of on-site heat regeneration technology with use all can be more and more extensive.
China is until just release First " asphalt highway regeneration techniques standard " truly in April, 2008 (JTGF41-2008), indicate that the asphalt highway regeneration techniques is subject 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 good technical system.This technical manual itself is also pointed out just regeneration techniques have been proposed than the direction in relative broad range, the technical foundation that also lacks at present comparative maturity, therefore, proposing to be not only for the method for testing and detecting of Applied of Asphalt Pavement Recycle Technique necessary for China Applied of Asphalt Pavement Recycle Technique present situation, is urgent simultaneously.
From 2002, China's part province such as Jiangsu, Henan, Shandong, Hebei etc. begin to introduce the hot reclaim equiment of Bituminous Pavement successively, and in succession put in the engineering application, obtained certain engineering application experience and good result of use, also make the on-site heat regeneration technology more and more come into one's own in the application of China.But than new black top road surface, still there is very large instability in its construction quality, also makes its result of use be subject to a lot of queries, has seriously limited its large-scale promotion application.Be exactly that its technique is mixed and stirred effect and affect the unsettled key influence factor of its quality.Mix and stir production than the factory of newly mixing asphalt, on-site heat regeneration is on the spot the road surface to be heated, then broken rear compensation regeneration agent, and the new materials such as new asphalt, and then mix and stir and obtain reclaimed asphalt mixture.Can find out, can the former ground surface material that fragmentation is mixed and stirred reach rational disperse state is the primary factor that affects the regenerating mixture quality, if in the on-site heat regeneration process, the old pavement material can't broken mix and stir the disperse state that reaches good, not only can cause the skewness of protobitumen ground surface material own, also can cause mixing and stirring of the old and new's material inhomogeneous, thereby cause the final regenerated road surface quality that forms bad.
As seen, the dispersiveness of well mixing and stirring of road surface, Bituminous Pavement hot regenerative process Central Plains compound is the precondition that ensures whole on-site heat regeneration construction technology quality, therefore, the Experimental Method in Laboratory of being badly in need of a kind of simple possible can carry out analysis of experiments to it, thereby provides basic guarantee for the successful implementation of on-site heat regeneration technology.
Summary of the invention
Technical matters: the technical problem to be solved in the present invention is to provide that in a kind of on-site heat regeneration process, former asphalt pavement mixture mixes and stirs dispersed detection method, by actual in the hot regenerative process of shop experiment simulated field mix and stir process conditions and with the disperse state contrast of newly mixing asphalt, can judge simply and easily the dispersiveness under hot technological condition of regeneration at the scene of former asphalt pavement mixture in the on-site heat regeneration process.
Technical scheme: for solving the problems of the technologies described above, the technical solution used in the present invention is:
Step 1: carry out cold cut and cut open and take material in will carrying out the blacktop position integral thickness scope of on-site heat regeneration, the feeding scale is for being not less than 75～105cm length * 75～105cm width, and finishing obtains to be no less than the former state asphalt pavement mixture sample of 3 20～25cm * 20～25cm;
step 2: with former state asphalt pavement mixture sample baking oven preheating insulation, holding temperature is chosen according to the actual heating effect of on-site heat regeneration equipment road pavement, sample is weighed and was carried out for two stages in the indoor compound mixer that is placed on uniform temp and mix and stir test, phase one is mixed and stirred 30～45s, subordinate phase identical mixing time when and then continuing to mix and stir with on-site heat regeneration equipment practice of construction, if used in the hot regenerative process of actual field outside regenerant etc. and mixed adjuvant, can mix and stir in the phase one and add after completing, and then carrying out subordinate phase mixes and stirs,
Step 3: after step 2 is completed, add immediately with mixer in the heavy preheating breeze such as former state asphalt pavement mixture, after mixing and stirring 45～60s, the bottom compound is turned over to the upper strata, continue to mix and stir 45～60s;
Step 4: until former state asphalt pavement mixture sample and breeze mix and stir potpourri cooling after, carry out size analysis, the test procedure that size analysis can be followed in the asphalt Inspection Method for Mineral Aggregate Grading T 0725-2000 of " highway engineering pitch and Asphalt Mixture Experiment rules " JTJ 052-2000 regulation is carried out, and calculates and record the grader retained percentage P of former state asphalt pavement mixture standard sieve i at different levels
i o
Step 5: according to bitumen aggregate ratio and the grating identical with the former state asphalt pavement mixture, choose new pitch and newly gather materials, new pitch and new aggregate feature should try one's best former ground surface material or choose according to actual demands of engineering, can also use the aged asphalt that obtains from former pavement asphalt mixture extracting and reclaiming and gather materials, indoorly mixing and stirring production and newly mix asphalt 5～6kg;
Step 6: after step 5 is completed, add immediately with mixer in newly mix the heavy preheating breeze such as asphalt, after mixing and stirring 45～60s, the bottom compound is turned over to the upper strata, continue to mix and stir 45～60s;
Step 7: until newly mix asphalt and breeze mix and stir potpourri cooling after, carry out the size analysis identical with step 4, calculate and record the grader retained percentage P that newly mixes asphalt standard sieve i at different levels
i n;
Step 8: calculate former state asphalt pavement mixture standard sieve grader retained percentage at different levels P
i oWith newly mix asphalt standard sieve grader retained percentage at different levels P
i nBetween difference,
P
i oAnd P
i n(grader retained percentage that is sieve aperture i 〉=0.3mm) calculates all to get sieve aperture i and be 0.3mm and above standard sieve thereof, when the protobitumen road surface that will carry out on-site heat regeneration is common hot-mixed bitumen pavement, former pavement asphalt mixture has the standard that dispersiveness should reach of mixing and stirring of satisfy producing: when sieve aperture i≤2.36mm, should satisfy Δ P≤5%, when sieve aperture i 〉=4.75mm, should satisfy Δ P≤6%; When the protobitumen road surface that will carry out on-site heat regeneration is the SMA asphaltic road-mix surface course, former pavement asphalt mixture has the standard that dispersiveness should reach of mixing and stirring of satisfy producing: when sieve aperture i≤2.36mm, Δ P≤3% should be satisfied, when sieve aperture i 〉=4.75mm, Δ P≤4% should be satisfied.
Beneficial effect: in the on-site heat regeneration process, to mix and stir dispersiveness be the good important embodiments of on-site heat regeneration process conditions to former Mixture for Asphalt Pavement, it is also the crucial precondition of on-site heat regeneration technology successful implementation, if can't ensureing, the on-site heat regeneration technology former pavement asphalt mixture can be mixed and stirred the disperse state that reaches good, not only former road surface aged asphalt compound can't reach good regeneration effect, can cause simultaneously aged asphalt compound and follow-up interpolation new material mix and stir badly, and then cause the deteriorated of whole reengineer quality.
In on-site heat regeneration process provided by the invention, former asphalt pavement mixture mixes and stirs dispersed detection method, the former pavement asphalt mixture of detection that not only can be good mix and stir dispersiveness, the evaluation of mixing and stirring effect for on-site heat regeneration technique provides good foundation, simultaneously can analyze the hot technological condition of regeneration of Different field such as heating-up temperature, mixing time, the impact effect to former road surface compound disperse state such as the application of regenerant, thereby for the optimization of on-site heat regeneration construction technology condition provides reasonable reference, to ensure the successful implementation of on-site heat regeneration technology.Simultaneously, test condition is simply improved, can also be used to the dispersed of comparative evaluation's different pitches compound and to mixing and stirring the dependence of process conditions, for production technology and the performance optimization of compound provides the good means that realize.In a word, the test method that the present invention proposes, test figure accurately and reliably, test method is simple and feasible, is easy to realize, has very good utilization and extention and is worth.
test method of the present invention has not only been carried out effective checking by a large amount of shop experiments, simultaneously in the good hot regeneration maintenance maintenance of the Bituminous Pavement that is applied to many highways, the hot regeneration maintenance maintenance engineering of Bituminous Pavement as Xu (Nanjing-Suqian-Xuzhou) highway Jiangsu Province, peaceful place Suqian section, protobitumen road surface compound disperse state in the on-site heat regeneration process has been carried out evaluation analysis, and Based on testing results is optimized design to on-site heat regeneration construction technology condition, effectively raise maintenance engineering reclaimed bituminous pavement service property (quality), verified the rationality of test method of the present invention, dependable with function.
Description of drawings
Fig. 1 is the experiment process figure that in on-site heat regeneration process provided by the invention, former asphalt pavement mixture mixes and stirs dispersed detection method.
Fig. 2 is the application example test findings figure that in on-site heat regeneration process provided by the invention, former asphalt pavement mixture mixes and stirs dispersed detection method.
Embodiment
Gather materials after mixing and stirring with pitch, can produce certain bonding clustering phenomena under the cementation of pitch, can not exist with original grating state again, but form different big or small asphalt micelles, exist with a kind of specific inherent disperse state, can be called the dispersiveness of asphalt.Compound must have good dispersiveness, can guarantee the compound compacting that evenly paves smoothly, forms homogeneous external phase bituminous pavement.But this dispersiveness is to be difficult to test obtain in the compound production run, also there is no relevant method for testing and analyzing at present.
In on-site heat regeneration process provided by the invention, former asphalt pavement mixture mixes and stirs its mentality of designing of dispersed detection method and is: formed the very ripe production technology of mixing and stirring owing to newly mixing asphalt, and its application has also obtained abundant engineering experience checking, therefore mix and stir test by lab simulation and obtain and dispersiveness before former pavement asphalt mixture has newly mixing bituminous mixture laying and rolling of identical bitumen aggregate ratio and grating, and as the desirable dispersiveness contrast benchmark of asphalt; And then mix and stir by lab simulation the dispersiveness that the former pavement asphalt mixture after the on-site heat regeneration scarifying is mixed and stirred is obtained in test; The latter and the former are compared, if the latter can reach identical or approximate dispersiveness, show that in the on-site heat regeneration process, former asphalt pavement mixture has good dispersiveness.
The concrete scheme that the present invention adopts is, at first utilize indoor small-sized compound mixer, mix and stir production and newly mix asphalt by simulating the working condition of newly mixing asphalt, newly the mixing the asphalt dispersiveness and can think a kind of desirable benchmark disperse state of this moment; And then by the hot technological condition of regeneration of simulated field, the block feeding in protobitumen road surface is mixed and stirred, obtain the disperse state of the former pavement asphalt mixture under the concrete on-site heat regeneration process conditions of reflection; Yet this moment, the disperse state of two kinds of asphalts was to determine by concrete size analysis, therefore, add wherein a large amount of breeze (breeze is 1: 1 with the mixture quality ratio), do not have in a large number can wrapping up rapidly of adhering breeze to be in the asphalt micelle of the different sizes of disperse state, thereby it is dispersed into the ingredient that is similar to the different-grain diameter size of gathering materials; After it is cooling, can carry out the asphalt micelle grating that this moment is obtained in size analysis, and this screening grating can reflect the dispersiveness of asphalt under hot state to a certain extent; With the disperse state of former pavement asphalt mixture with newly mix asphalt benchmark disperse state and compare, namely can assess its dispersiveness.Can reach following two purposes by such test design:
1. adopt bitumen aggregate ratio and the grating identical with on-site heat regeneration former road surface compound owing to newly mixing asphalt, and it mixes and stirs working condition is more satisfactory process conditions, therefore its dispersiveness can be used as contrast standard, the dispersiveness of on-site heat regeneration former road surface compound is compared with it, can understand the rationality of the disperse state of protobitumen road surface compound under the on-site heat regeneration process conditions of selecting.
2. by simulating the contrast of the former pavement asphalt mixture dispersiveness that different on-site heat regeneration process conditions obtain, can effectively judge the influence factor of former pavement asphalt mixture dispersiveness, and then provide favourable foundation for the optimal design of on-site heat regeneration process conditions.
As shown in Figure 1, in on-site heat regeneration process provided by the invention, former asphalt pavement mixture mixes and stirs dispersed detection method and comprises the following steps:
step 1: carry out cold cut and cut open and take material in will carrying out the blacktop position integral thickness scope of on-site heat regeneration, the feeding scale is for being not less than 75～105cm length * 75～105cm width, and finishing obtains to be no less than the former state asphalt pavement mixture sample of 3 20～25cm * 20～25cm, as without specific (special) requirements, the feeding on protobitumen road surface and sampling finishing should be followed the relevant regulations of the asphalt sampling method T 0701-2000 of " highway engineering pitch and Asphalt Mixture Experiment rules " JTJ 052-2000 regulation, cut open and take material with the disturbance of reduce to former ground surface material character and compaction state thereof carrying out cold cut in the layer position integral thickness scope that will carry out on-site heat regeneration, should carefully remove foreign material during sampling finishing simultaneously, the asphalt and the marginal portion that do not belong to the feeding layer gather materials because of the fragmentation that feeding causes,
step 2: with former state asphalt pavement mixture sample baking oven preheating insulation, holding temperature is chosen according to the actual heating effect of on-site heat regeneration equipment road pavement, sample is weighed and was carried out for two stages in the indoor compound mixer that is placed on uniform temp and mix and stir, phase one is mixed and stirred 30～45s, with the scarifying effect of simulated field heat regeneration milling scarifying cylinder to former pavement asphalt mixture, subordinate phase identical mixing time when and then continuing to mix and stir with on-site heat regeneration equipment practice of construction, with the effect of mixing and stirring in the hot regeneration stirring apparatus actual production process of simulated field, if used the outer adjuvants of mixing such as regenerant in the on-site heat regeneration process, mix and stir in the phase one and add after completing, and then carry out subordinate phase and mix and stir test,
Step 3: after step 2 is completed, add immediately with mixer in the heavy preheating breeze such as former state asphalt pavement mixture, after mixing and stirring 45～60s, the bottom compound is turned over to the upper strata, continue to mix and stir 45～60s, to guarantee that breeze fully wraps the dispersed bitumens compound;
Step 4: until former state asphalt pavement mixture sample and breeze mix and stir potpourri cooling after, carry out size analysis, the test procedure that size analysis can be followed in the asphalt Inspection Method for Mineral Aggregate Grading T 0725-2000 of " highway engineering pitch and Asphalt Mixture Experiment rules " JTJ 052-2000 regulation is carried out, and calculates and record the grader retained percentage P of former state asphalt pavement mixture standard sieve i at different levels
i o
step 5: according to bitumen aggregate ratio and the grating identical with the former state asphalt pavement mixture, choose new pitch and newly gather materials, new pitch and new aggregate feature should try one's best former ground surface material or choose according to actual demands of engineering, can also use the aged asphalt that obtains from former pavement asphalt mixture extracting and reclaiming and gather materials, indoorly mix and stir production and newly mix asphalt 5～6kg, newly mix mixing and stirring production and can carrying out according to B.5.2 relevant regulations in " standard specification for construction and acceptance of highway asphalt pavement " JTG F40-2004 appendix B hot-mix asphalt mixture mixing proportion design method of asphalt,
Step 6: after step 6 is completed, add immediately with mixer in newly mix the heavy preheating breeze such as asphalt, after mixing and stirring 45～60s, the bottom compound is turned over to the upper strata, continue to mix and stir 45～60s;
Step 7: until newly mix asphalt and breeze mix and stir potpourri cooling after, carry out the size analysis identical with step 4, calculate and record the grader retained percentage P that newly mixes asphalt standard sieve i at different levels
i n
Step 8: calculate former state asphalt pavement mixture standard sieve grader retained percentage at different levels P
i oWith newly mix asphalt standard sieve grader retained percentage at different levels P
i nBetween difference,
P
i oAnd P
i n(grader retained percentage that is sieve aperture i 〉=0.3mm) calculates all to get sieve aperture i and be 0.3mm and above standard sieve thereof, when the protobitumen road surface that will carry out on-site heat regeneration is common hot-mixed bitumen pavement, former pavement asphalt mixture has the standard that dispersiveness should reach of mixing and stirring of satisfy producing: when sieve aperture i≤2.36mm, should satisfy Δ P≤5%, when sieve aperture i 〉=4.75mm, should satisfy Δ P≤6%; When the protobitumen road surface that will carry out on-site heat regeneration is the SMA asphaltic road-mix surface course, former pavement asphalt mixture has the standard that dispersiveness should reach of mixing and stirring of satisfy producing: when sieve aperture i≤2.36mm, Δ P≤3% should be satisfied, when sieve aperture i 〉=4.75mm, Δ P≤4% should be satisfied.
Application example: testing method of the present invention has obtained effective checking of entity project.Xu (Nanjing-Suqian-Xuzhou) highway Jiangsu Province, peaceful place Suqian section is applied to the on-site heat regeneration technology maintenance engineering of SMA bituminous pavement at home first.Than common hot-mix asphalt mixture, the SMA compound has special material and forms (skeleton structure is outstanding, and bitumen content is large, and fine material content is large and use fiber), therefore require relatively harsher to the condition of mixing and stirring (mixing and stirring temperature, the mixing time etc.) of producing.Owing to not having ripe experience or technical measures can be used for reference and use, can existing on-site heat regeneration equipment mix and stir with the scarifying of original SMA bituminous pavement the disperse state that reaches good, thereby be conducive to regenerant, the interpolation of the new materials such as new asphalt and mixing and stirring, and form the regeneration SMA compound with good pavement performance, must consider carefully and determine in advance.Therefore, according to testing method of the present invention, former SMA pavement compound dispersiveness under the hot technological condition of regeneration of Different field has been carried out detecting and estimated, and according to the test findings of detection method of the present invention, on-site heat regeneration construction technology condition being optimized design, this maintenance engineering regeneration SMA bituminous pavement operating position is good at present.In this entity project, the concrete implementation step of test method of the present invention is as follows:
Step 1: be K153+700 in the peaceful peaceful direction pile No. of place Xu Gaosugonglusu, having carried out cold cut in the bituminous pavement upper layer thickness range of three typical sections of K153+800 and K153+900 cuts open and takes material, the scale of each feeding point all is about 105cm length * 105cm width, and finishing obtains 5 approximately former state asphalt pavement mixture samples of 20cm length * 20cm width;
Step 2: be the different on-site heat regeneration construction technology condition of comparative analysis, for former state asphalt pavement mixture sample baking oven preheating insulation temperature T and subordinate phase mixing time t and whether use regenerant (R) to set 5 kinds of different simulation test conditions: 120-1:T=120 ℃, t=1min does not use regenerant (R); 120-1-R:T=120 ℃, t=1min uses regenerant (R); 120-2-R:T=120 ℃, t=2min uses regenerant (R); 130-2-R:T=130 ℃, t=2min uses regenerant (R); 140-2-R:T=140 ℃, t=2min uses regenerant (R), carries out respectively the test of mixing and stirring of former state asphalt pavement mixture, and the sample that obtains is respectively: 120-1; 120-1-R; 120-2-R; 130-2-R; 140-2-R;
Step 3: after step 2 is completed, add immediately with mixer in the heavy preheating breeze such as former state asphalt pavement mixture, after mixing and stirring 45～60s, the bottom compound is turned over to the upper strata, continue to mix and stir 45～60s;
Step 4: until the former state asphalt pavement mixture sample that obtains under the different tests condition and breeze mix and stir potpourri cooling after, follow the test procedure in the asphalt Inspection Method for Mineral Aggregate Grading T 0725-2000 of " highway engineering pitch and Asphalt Mixture Experiment rules " JTJ 052-2000 regulation, carry out respectively size analysis, calculated and recorded the grader retained percentage P of former state asphalt pavement mixture standard sieve i at different levels
i o, as shown in table 1;
Table 1
step 5: protobitumen road surface compound is the SMA13 compound, its bitumen aggregate ratio is 6.35%, the match ratio of gathering materials is as shown in table 2, choosing the engineering application newly gathers materials, the design grating of newly gathering materials is as shown in table 3, basically identical with the old material grating of table 2, the new pitch of SBS70 that new pitch selects engineering to use, and mix and stir production according to the bitumen aggregate ratio 6.35% identical with protobitumen road surface compound with newly gathering materials, because being produces the SMA asphalt, mix and stir production run what newly mix asphalt, also added 0.3% wood fibre, mix and stir to produce to obtain and newly mix SMA13 asphalt 5kg,
Table 2
| Size of mesh/ |
16 | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 | 0.15 | 0.075 |
| By percent/% | 100 | 95.9 | 68.6 | 33.7 | 24.6 | 19.9 | 15.4 | 13 | 11.7 | 11.4 |
Table 3
| Size of mesh i/mm | 1# | 2# | 3# | 4# | Breeze | The design grating of newly gathering |
| 16 | 100 | 100 | 100 | 100 | 100 | 100.0 |
| 13.2 | 85 | 100 | 100 | 100 | 100 | 96.3 |
| 9.5 | 3.1 | 81.6 | 100 | 100 | 100 | 68.0 |
| 4.75 | 0.1 | 2.9 | 89.7 | 100 | 100 | 33.7 |
| 2.36 | 0 | 0.2 | 8.3 | 80 | 100 | 25.1 |
| 1.18 | 0 | 0 | 1.4 | 49.2 | 100 | 19.4 |
| 0.6 | 0 | 0 | 0.5 | 30.7 | 100 | 16.2 |
| 0.3 | 0 | 0 | 0 | 14.6 | 100 | 13.5 |
| 0.15 | 0 | 0 | 0 | 7.6 | 100 | 12.3 |
| 0.075 | 0 | 0 | 0 | 2.9 | 99.9 | 11.5 |
| Mixing ratio | 25 | 42 | 5 | 17 | 11 | - |
Step 6: after step 5 is completed, add immediately with mixer in newly mix the heavy 5kg preheating breeze such as asphalt, after mixing and stirring 45～60s, the bottom compound is turned over to the upper strata, continue to mix and stir 45～60s;
Step 7: until newly mix asphalt and breeze mix and stir potpourri cooling after, carry out the size analysis identical with step 4, calculate and record the grader retained percentage P that newly mixes asphalt standard sieve i at different levels
i n, as shown in table 4;
Table 4
| Size of mesh i/ |
16 | 13.2 | 9.5 | 4.75 | 2.36 | 1.18 | 0.6 | 0.3 |
| Grader retained percentage P i n/％ | 0.3 | 8.0 | 11.2 | 19.6 | 4.2 | 3.7 | 4.4 | 4.5 |
Step 8: calculate respectively the former state asphalt pavement mixture standard sieve grader retained percentage at different levels P that obtains under the different tests condition
i oWith newly mix asphalt standard sieve grader retained percentage at different levels P
i nBetween difference,
As table 5 and shown in Figure 2.
Table 5
Because the protobitumen road surface that will carry out on-site heat regeneration is the SMA asphalt, therefore, former pavement asphalt mixture has and satisfies the standard that dispersiveness should reach of mixing and stirring of producing and be: when i≤2.36mm, and Δ P≤3%, when i 〉=4.75mm, Δ P≤4%.Can find out from the result of calculation of table 5 and Fig. 2,120 ℃ of 120-1 representative mix and stir temperature and 1min mixing time construction technology condition can't obtain the dispersed (i=13.2mm of satisfied former pavement asphalt mixture, 9.5mm all surpassed 4% maximum permissible value with the Δ P of 4.75mm, the Δ P of i=0.6mm and 0.3mm has also all surpassed 3% maximum permissible value); 120 ℃ of the 120-1-R representative are mixed and stirred temperature, the construction technology condition of 1min mixing time and use regenerant can't obtain satisfied former pavement asphalt mixture dispersiveness equally, and (the Δ P of i=9.5mm and 4.75mm has has all met or exceeded 4% maximum permissible value, the Δ P of i=0.6mm and 0.3mm has also all surpassed 3% maximum permissible value), but the use that can find out regenerant effectively reduces Δ P than the condition of not using regenerant, illustrates that the use of regenerant helps to improve the dispersiveness of former pavement asphalt mixture; 120 ℃ of the 120-2-R representative are mixed and stirred temperature, 2min mixing time and to use the construction technology condition of regenerant can obtain substantially to satisfy the former pavement asphalt mixture of standard dispersed (when i≤2.36mm, Δ P≤3%, when i 〉=4.75mm, Δ P＜4%), show that extending the mixing time can effectively improve former pavement asphalt mixture dispersiveness; 130 ℃ of the 130-2-R representative are mixed and stirred temperature, the construction technology condition of 2min mixing time and use regenerant can obtain satisfied former pavement asphalt mixture dispersed (maximum Δ P only has 2.5% left and right), shows to improve and mixes and stirs the dispersiveness that temperature can effectively improve former pavement asphalt mixture; 140 ℃ of the 140-2-R representative are mixed and stirred temperature, the 2min mixing time can obtain relative best former pavement asphalt mixture dispersed (maximum Δ P is only in 2% left and right) with the construction technology condition of using regenerant, has verified that again the raising of mixing and stirring temperature can effectively improve the dispersiveness of former pavement asphalt mixture.
Sum up above-mentioned test condition and corresponding test testing result, at the scene in heat regeneration work progress, for guaranteeing that protobitumen road surface compound has good dispersion effect, the construction technology condition that should take is: mix and stir temperature and be not less than 130 ℃, mixing time is not less than 2min, and uses regenerant as far as possible.And the original construction technology condition of the on-site heat regeneration preparation of construction of this maintenance project is approximately 120 ℃ of left and right of the average heating-up temperature in road surface (also namely mixing and stirring temperature), usually the construction speed of travel is in the 3m/min left and right, the corresponding mixing time is in the 1.5min left and right, pass through Improvement, the construction technology condition that finally reaches is that the average heating-up temperature in road surface (also namely mixing and stirring temperature) is 130～140 ℃ of left and right, the construction speed of travel is adjusted into 2m/min, and the corresponding mixing time is in the 2min left and right.
The entity project application example shows, in on-site heat regeneration process provided by the invention, former asphalt pavement mixture mixes and stirs dispersed detection method, data accurately and reliably, easy to operate feasible, be easy to realize, can reflect accurately that the hot Regeneration Construction Technique condition of Different field mixes and stirs dispersed impact to protobitumen road surface compound, thereby for selection and the design of on-site 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. in an on-site heat regeneration process, former asphalt pavement mixture mixes and stirs dispersed detection method, it is characterized in that the method comprises the steps:
Step 1: carry out cold cut and cut open and take material in will carrying out the blacktop position integral thickness scope of on-site heat regeneration, the feeding scale is length 75～105cm, width 75～105cm, and finishing obtains to be no less than the former state asphalt pavement mixture sample of 3 20～25cm * 20～25cm;
Step 2: with former state asphalt pavement mixture sample baking oven preheating insulation, holding temperature is chosen according to the actual heating effect of on-site heat regeneration equipment road pavement, sample is weighed and was carried out for two stages in the indoor compound mixer that is placed on uniform temp and mix and stir test, phase one is mixed and stirred 30～45s, subordinate phase identical mixing time when and then continuing to mix and stir with on-site heat regeneration equipment practice of construction, if used regenerant in the hot regenerative process of actual field, mix and stir in the phase one and add after completing, and then carry out subordinate phase and mix and stir;
Step 3: after step 2 is completed, add immediately with mixer in the heavy preheating breeze such as former state asphalt pavement mixture, after mixing and stirring 45～60s, the bottom compound is turned over to the upper strata, continue to mix and stir 45～60s;
Step 4: until former state asphalt pavement mixture sample and breeze mix and stir potpourri cooling after, carry out size analysis, the test procedure that size analysis is followed in the asphalt Inspection Method for Mineral Aggregate Grading T0725-2000 of " highway engineering pitch and Asphalt Mixture Experiment rules " JTJ052-2000 regulation is carried out, and calculates and record the grader retained percentage P of former state asphalt pavement mixture standard sieve i at different levels
i o
Step 5: according to bitumen aggregate ratio and the grating identical with the former state asphalt pavement mixture, choose new pitch and newly gather materials, new pitch and new aggregate feature should try one's best former ground surface material or choose according to actual demands of engineering;
Step 6: after step 5 is completed, add immediately with mixer in newly mix the heavy preheating breeze such as asphalt, after mixing and stirring 45～60s, the bottom compound is turned over to the upper strata, continue to mix and stir 45～60s;
Step 7: until newly mix asphalt and breeze mix and stir potpourri cooling after, carry out the size analysis identical with step 4, calculate and record the grader retained percentage P that newly mixes asphalt standard sieve i at different levels
i n;
Step 8: calculate former state asphalt pavement mixture standard sieve grader retained percentage at different levels P
i oWith newly mix asphalt standard sieve grader retained percentage at different levels P
i nBetween difference, Δ P=|P
i o-P
i n|, P
i oAnd P
i nThe grader retained percentage of all getting sieve aperture i and be 0.3mm and above standard sieve thereof calculates, sieve aperture i 〉=0.3mm.
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