CN103132418B - Construction mixing temperature determination method of warm-mix asphalt mixture using surface active warm-mix agent - Google Patents
Construction mixing temperature determination method of warm-mix asphalt mixture using surface active warm-mix agent Download PDFInfo
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Abstract
The invention provides a construction mixing temperature determination method of a warm-mix asphalt mixture using a surface active warm-mix agent. The method comprises the steps that: two parts of asphalt used for a designed asphalt mixture are weighed, wherein the masses of the two parts are the same; two parts of mineral powder used for the designed asphalt mixture are weighed, wherein the masses of the two parts are the same; two parts of original asphalt mastic are obtained; One part of the original asphalt mastic is selected, and is mixed according to a ratio of the original asphalt mastic to the surface active warm-mix agent; a viscosity-temperature curve of the original asphalt mastic and the viscosity-temperature curve of the warm-mix asphalt mastic are drawn respectively; the construction mixing temperature of the designed asphalt mixture is obtained in the viscosity-temperature curve of the original asphalt mastic, and the construction mixing temperature of the warm-mix asphalt is obtained in the viscosity-temperature curve of the warm-mix asphalt mastic. With the method provided by the invention, the difficulty in accurately evaluating the construction mixing temperature of the warm-mix asphalt mixture using the surface active warm-mix agent is effectively solved, such that beneficial basis is provided for in-situ warm-mix asphalt pavement construction condition design and for selection of warm-mix agent.
Description
Technical field
The present invention a kind ofly uses the construction of the Warm-Mix Bitumen Mixture of surface-active warm-mixing agent to mix and stir temperature determining method, is mainly used to solve the Warm-Mix Bitumen Mixture using surface-active warm-mixing agent in the produced on-site process of current warm-mixed asphalt road surface
Temperature of mixing and stirring cannot the problem of accurate evaluation, belong to asphalt highway warm mix technical field.
Background technology
In recent years along with the pay attention to day by day of environmental protection, Warm-Mix Bitumen Mixture is progressively paid attention to by various countries and is applied.
According to being familiar with at present and applicable cases, an indicative definition is given: so-called Warm-Mix Bitumen Mixture is that a class mixes and stirs temperature between hot-mix asphalt mixture (150 DEG C-180 DEG C) and cold mixing (normal temperature) (10 DEG C-40 DEG C) bituminous mixture, the novel asphalt compound of performance reaches (or close) hot-mix asphalt mixture to this novel compound.
At present by adding organic viscosity reduction additive, surface-active warm-mixing agent or adopt each class methods such as soft or hard pitch combines to mix and stir temperature to the construction reducing compound in compound, these compounds all can be referred to as Warm-Mix Bitumen Mixture.Compared with hot-mix asphalt mixture, according to mix type, the mixing and stirring temperature and generally can reduce by 15 DEG C-40 DEG C of different Warm-Mix Bitumen Mixture, the Railway Project adopting Warm-Mix Bitumen Mixture can alleviate hot-mix asphalt mixture well to cause because high temperature mixes and stirs:
First, the noxious gas emission problem under high temperature.Due to hot-mix asphalt mixture to mix and stir temperature high, so compound mixing process and even phenomenon that when paving, blue or green cigarette is a burst of are apparent.According to external examining report, bituminous mixture from heat mix transfer to warm mix can make carbon dioxide CO2 discharge reduce about 1/2, carbon monoxide COl discharge reduce about 2/3, sulfur dioxide SO2 reduce 40%, nitrogen oxide NOx class reduce nearly 60%.This illustrates that the environmental benefit adopting warm mix asphalt technologies is obviously.In addition, " glance coal " stimulation to side operating personnel's respiratory system that hot-mix asphalt mixture evaporates in mixing and paving process is also the self-explantory fact.Therefore, consider environmental benefit, apply Warm-Mix Bitumen Mixture significant.
Secondly, the cementitious matter problem of aging that high temperature causes.The mixing of hot-mix asphalt mixture and construction temperature are quite high.Well this point can be described to the associated temperature regulation of hot-mix asphalt mixture in " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004).For No. 90 pitches, asphalt heating temperature is 150 DEG C-160 DEG C, and aggregate heating temperature is 160 DEG C-190 DEG C.Consider and roll smoothly, the temperature of compound after being transported to scene will remain on more than 140 DEG C, then the temperature of compound accumulating is generally greater than 150 DEG C.For No. 70 pitches, above-mentioned every temperature also will improve 5 DEG C; If adopt at present in China's application also modified bitumen very widely, when so mixing and stirring, modified bitumen temperature will be heated to about 175 DEG C, aggregate temperature is heated to 190 DEG C-220 DEG C.When mixing and stirring, pitch wraps up in the thickness of the asphalt membrane be attached on dense-graded aggregate substantially all between 5-10 μ ε, in so high temperature and be when having oxygen, is understood that aging being difficult to of pitch is avoided; Meanwhile, it is also high to mix and stir the high accumulating temperature of bituminous mixture that must cause of temperature, and this process also can produce aging naturally.Adopt warm mix technology effectively can reduce the construction temperature of bituminous mixture, also just reduce the degree of aging of bituminous cements accordingly.
Again, energy consumption problem.Adopt Warm-Mix Bitumen Mixture greatly can reduce and mixes and stirs temperature, and then can remarkable energy conservation.
Due to warm-mixing agent kind and principle different, still there is very large unstability in warm-mixed asphalt construction quality of pavement, also makes its warm mix effect receive a lot of query, seriously limit its large-scale promotion application.And the key influence factor affecting its quality instability is exactly the accurate judgement of the warm mix effect of Warm-Mix Bitumen Mixture.The warm mix effect of bituminous mixture is exactly mainly reflected by the reduction that temperature is mixed and stirred in bituminous mixture construction, after adopting warm-mixing agent, compared to the bituminous mixture of former state, it is lower that temperature is mixed and stirred in the construction of Warm-Mix Bitumen Mixture, then show that its warm mix effect is more obvious.But, in practice of construction process, use the construction temperature of the Warm-Mix Bitumen Mixture of warm-mixing agent be difficult to Accurate Determining or measure cost prohibitive, so the construction temperature of a lot of Warm-Mix Bitumen Mixture is all random selecting or determines based on experience, this has buried very large hidden danger with regard to giving the construction quality of Warm-Mix Bitumen Mixture.
" standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004) adopts the viscosity of pitch to mix and stir temperature to the construction controlling bituminous mixture.In engineering and desk research, applicant finds that there is organic additive and adopts the construction of the warm-mixed asphalt bituminous mixture of soft or hard pitch combined technology to mix and stir temperature and can control to determine by the viscosity of warm-mixed asphalt.But, surface-active warm-mixing agent asphalt viscosity test on asphalt viscosity without any impact.This is because its warm mix mechanism of difference of warm-mixing agent kind is completely different, organic viscosity reduction additive and fluxed bitumen all can make protobitumen thinning and cause its viscosity to decline, and the action principle of surface-active warm-mixing agent plays lubrication between pitch and the interface that gathers materials, so simple asphalt viscosity test can not characterize its cooling-down effect, thus can not accurately judge to use the construction of the Warm-Mix Bitumen Mixture of surface-active warm-mixing agent to mix and stir temperature, also just limit the large-scale promotion application of surface-active warm-mixing agent.
Therefore, the Experimental Method in Laboratory being badly in need of a kind of simple possible can the warm mix effect row Validity Test of the active warm-mixing agent of effects on surface, thus accurately judge to use the construction of the Warm-Mix Bitumen Mixture of surface-active warm-mixing agent to mix and stir temperature, and then provide basic guarantee for the successful popularization of surface-active warm-mixing agent.
Summary of the invention
Technical problem: the technical problem to be solved in the present invention is to provide and a kind ofly uses the construction of the Warm-Mix Bitumen Mixture of surface-active warm-mixing agent to mix and stir temperature determining method, can judge the warm mix effect of surface-active warm-mixing agent simply accurately and use the construction of the Warm-Mix Bitumen Mixture of surface-active warm-mixing agent to mix and stir temperature.
Technical scheme: for solving the problems of the technologies described above, the technical solution used in the present invention is:
Use the construction of the Warm-Mix Bitumen Mixture of surface-active warm-mixing agent to mix and stir a temperature determining method, it is characterized in that, step is as follows:
Step 1: take quality and be not less than the designing asphalt mixture of the homogenous quantities of 800g pitch two parts used, be all heated to 170 ~ 180 DEG C; The quality of every part is not less than 800g, the enough consumptions of follow-up viscosity test can be ensured, be all heated to 170 ~ 180 DEG C, can ensure that pitch has enough mobility and mixes with breeze, general matrix pitch temperature can get low value, and modified bitumen temperature can get high level;
Step 2: take the breeze that two parts of designing asphalt mixtures of the pitch homogenous quantities used with described designing asphalt mixture are used, be all heated to 170 ~ 180 DEG C; The quality of breeze every part is also not less than 800g, the enough consumptions of follow-up viscosity test can be ensured, be all heated to 170 ~ 180 DEG C, carry out heating to breeze and can promote and pitch evenly miscible, general matrix pitch temperature can get low value, and modified bitumen temperature can get high level;
Step 3: the pitch of step 1 is mixed according to 1:1 mass ratio with the breeze of step 2, uniform stirring 5 ~ 10min, obtains two parts of former state asphalt mastics; Stir 5 ~ 10min, can ensure that breeze mixes with pitch, general matrix pitch mixing time can get low value, and the modified asphalt-stirring time can get high level;
Step 4: a copy of it former state asphalt mastic that selecting step 3 obtains, the ratio that asphalt mastic and surface-active warm-mixing agent mass ratio are 1000:5 ~ 10 as it is takes surface-active warm-mixing agent and mixes with former state asphalt mastic, uniform stirring 5 ~ 10min; The adding proportion of surface-active warm-mixing agent, the use volume (mass ratio of surface-active warm-mixing agent and pitch) recommended according to surface-active warm-mixing agent calculates the required surface-active warm-mixing agent consumption added of asphalt mastic, take surface-active warm-mixing agent and mix with former state asphalt mastic, uniform stirring 5 ~ 10min, can ensure that surface-active warm-mixing agent mixes with former state asphalt mastic, if former state asphalt mastic uses matrix pitch to get low value, if former state asphalt mastic uses modified bitumen to get high level;
Step 5: according to Li Qingbushi rotary viscosity test, optional two temperature within the scope of 120 DEG C ~ 180 DEG C, test the viscosity of former state asphalt mastic and warm-mixed asphalt rubber cement respectively, the interval of two temperature of selection should lower than 30 DEG C; The Li Qingbushi rotary viscosity test (T0625-2000) that Li Qingbushi rotary viscosity test specifies with " highway engineering pitch and Asphalt Mixture Experiment code " (JTJ052-2000) is for standard, and the interval of two temperature of selection should lower than 30 DEG C;
Step 6: take probe temperature as x value, with the viscosity of correspondence for y value, draws the viscosity-temperature curve of former state asphalt mastic and the viscosity-temperature curve y=ax+b of warm-mixed asphalt rubber cement respectively;
Step 7: temperature is mixed and stirred in the construction according to designing asphalt mixture, in the viscosity-temperature curve of the former state asphalt mastic of step 6 acquisition, determines that viscosity is mixed and stirred in the construction of designing asphalt mixture;
Step 8: viscosity is mixed and stirred in the construction according to the designing asphalt mixture of step 7 acquisition, in the viscosity-temperature curve of the warm-mixed asphalt rubber cement of step 6 acquisition, temperature is mixed and stirred in the anti-construction pushing away acquisition Warm-Mix Bitumen Mixture.
Described take designing asphalt mixture asphalt quality used is 800 ~ 1000g.
Described test former state asphalt mastic and the temperature of warm-mixed asphalt cement viscosity are 135 DEG C and 175 DEG C.
Beneficial effect:
The important embodiment that temperature is warm-mixing agent warm mix effect is mixed and stirred in the construction of Warm-Mix Bitumen Mixture, also be the key precondition condition of warm mix technology successful implementation, if warm mix technology cannot ensure that the construction of bituminous mixture is mixed and stirred temperature and improved, not only under cooling conditions, bituminous mixture does not reach good construction effect and construction may be caused to occur quality problems, adds warm-mixing agent cost in vain simultaneously.
Provided by the inventionly a kind ofly the construction of the Warm-Mix Bitumen Mixture of surface-active warm-mixing agent is used to mix and stir temperature determining method, can be simple and easy and determine the warm mix effect of the surface-active warm-mixing agent close with construction condition accurately.Meanwhile, the present invention is not only to showing the test of active warm-mixing agent effectively, and the warm mix technology combined to organic additive, employing soft or hard pitch is effective equally, facilitates the comparative analysis of dissimilar warm mix technology warm mix effect.In a word, the method that the present invention proposes, accurately and reliably, test method is simple and feasible for experimental data, is easy to realize, and has very good utilization and extention and is worth.
Test method of the present invention has not carried out effective checking by means of only a large amount of laboratory test, the method has been applied in the warm-mixed asphalt pavement construction on-the-spot test of many speedways simultaneously, in on-the-spot test as transport hub, southern station, Nanjing SMA flexible pavement, to the former state designing asphalt mixture in site operation process, Sasobit Warm-Mix Bitumen Mixture, Evotherm M1 Warm-Mix Bitumen Mixture warm mix effect has carried out evaluation analysis, and according to result of the test to on-the-spot asphalt pavement construction process conditions, warm-mixing agent volume is optimized design, effectively reduce the construction temperature on SMA road surface, ensured its good construction quality simultaneously, demonstrate the reasonability of test method of the present invention, dependable with function.
Accompanying drawing explanation
Fig. 1 provided by the inventionly a kind ofly uses the construction of the Warm-Mix Bitumen Mixture of surface-active warm-mixing agent to mix and stir temperature
The viscosity-temperature curve figure of the former state asphalt mastic of degree defining method.
Fig. 2 provided by the inventionly a kind ofly uses the construction of the Warm-Mix Bitumen Mixture of surface-active warm-mixing agent to mix and stir temperature
The viscosity-temperature curve figure of the warm-mixed asphalt rubber cement of degree defining method.
Detailed description of the invention
Add warm-mixing agent in bituminous mixture after, compound can carry out mixing and stirring and compacting mixing and stirring than normal construction at the low temperature of temperature, mixing and stirring of obtaining is consistent with consolidation effect and hot-mix asphalt mixture, can be described as Warm-Mix Bitumen Mixture warm mix effect at such a temperature, namely this warm-mixing agent can be lowered the temperature how many degree under this volume.But the warm mix effect of warm-mixing agent because error is difficult to effectively accurately record, also just means using the construction of Warm-Mix Bitumen Mixture after warm-mixing agent to mix and stir temperature should be how much be difficult to determine in bulk testing.If but after reasonably can not determining to use warm-mixing agent, temperature is mixed and stirred in the construction of Warm-Mix Bitumen Mixture, is just easy to the construction quality affecting Warm-Mix Bitumen Mixture.If fixed too high of construction temperature, warm mix effect is remarkable, just cannot reach result of use and the economic benefit of expection; If fixed too low of construction temperature, Warm-Mix Bitumen Mixture is just not easy uniform mixing and roller-compaction, can cause the decline of later stage service property (quality).Therefore, when after use warm-mixing agent, must determine that temperature is mixed and stirred in the construction of Warm-Mix Bitumen Mixture accurately.Current " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004) generally adopts the viscosity of pitch to control the mixing and compaction temperatures of bituminous mixture, if then this method is applied in Warm-Mix Bitumen Mixture, mix and stir temperature for using the construction of Warm-Mix Bitumen Mixture of organic viscosity reduction warm-mixing agent and determine it is effective, but mixing and stirring temperature for the construction of the Warm-Mix Bitumen Mixture using surface-active warm-mixing agent determines and inapplicable.Because surface-active warm-mixing agent joins the viscosity that can't affect pitch in pitch.Therefore, use at present the construction of the warm mix reclaimed asphalt mixture of surface-active warm-mixing agent to mix and stir temperature to determine, all with certain randomness and empirical, to lack theoretical and test basis.This is also hinder one of surface-active warm-mixing agent large-scale promotion application very important reason.
Provided by the inventionly a kind ofly use the construction of the Warm-Mix Bitumen Mixture of surface-active warm-mixing agent to mix and stir its mentality of designing of temperature determining method to be: the warm mix principle of surface-active warm-mixing agent in bituminous mixture plays lubrication between pitch and the interface that gathers materials, this lubrication can reduce the resistance gathered materials in the process of mixing and stirring, and thus plays and reduces the effect that temperature is mixed and stirred in bituminous mixture construction; Because the specific area of breeze is very large, be far longer than and gather materials, pitch, after adding compound, first sticks to the surface of breeze and forms asphalt mastic with breeze, between therefore gathering materials to mix and stir that resistance originates greatly be breeze and asphalt mastic; Surface-active warm-mixing agent can mainly concentrate in asphalt mastic equally after adding bituminous mixture, thus play the effect at interface between lubrication breeze and pitch, if the impact of surface-active warm-mixing agent on asphalt mastic viscosity therefore can be tested out, just can reflect the warm mix effect of surface-active warm-mixing agent in bituminous mixture really, also just can accurately judge that the reasonable construction of Warm-Mix Bitumen Mixture mixes and stirs temperature.
The concrete scheme that the present invention adopts is: take the pitch that two parts of designing asphalt mixtures are used, the quality of every part is for being not less than 800g, in reality test, can choose in the scope of 800 ~ 1000g, all be heated to 170 ~ 180 DEG C and (can ensure that pitch has enough mobility and mixes with breeze, general matrix pitch temperature can get low value, modified asphalt warm
Degree can get high level); Take the breeze that two parts of designing asphalt mixtures are used, the quality of every part and the identical in quality of the pitch that designing asphalt mixture is used above, also be 800 ~ 1000g (the enough consumptions of follow-up viscosity test can be ensured), all be heated to 170 ~ 180 DEG C (to carry out heating to breeze and can promote and pitch evenly miscible, general matrix pitch temperature can get low value
Modified bitumen temperature can get high level); Pitch is mixed according to 1:1 mass ratio with breeze, uniform stirring 5 ~ 10min (can ensure that breeze mixes with pitch, general matrix pitch mixing time can get low value, and the modified asphalt-stirring time can get high level), obtain two parts of former state asphalt mastics; Choose a copy of it former state asphalt mastic, the use volume (mass ratio of surface-active warm-mixing agent and pitch) recommended according to surface-active warm-mixing agent calculates the required surface-active warm-mixing agent consumption added of asphalt mastic, take surface-active warm-mixing agent and mix with former state asphalt mastic, uniform stirring 5 ~ 10min (can ensure that surface-active warm-mixing agent mixes with former state asphalt mastic, if former state asphalt mastic uses matrix pitch to get low value, if former state asphalt mastic uses modified bitumen to get high level); Optional two temperature within the scope of 120 DEG C ~ 180 DEG C, test the viscosity of former state asphalt mastic and warm-mixed asphalt rubber cement respectively, the interval of two temperature selected should lower than 30 DEG C, temperature choose the Li Qingbushi rotary viscosity test (T0625-2000) that can also specify according to " highway engineering pitch and Asphalt Mixture Experiment code " (JTJ052-2000), test 135 DEG C of viscosity and 175 DEG C of viscosity of former state asphalt mastic and warm-mixed asphalt rubber cement respectively; Take probe temperature as x value, with the viscosity of correspondence for y value, draw the viscosity-temperature curve of former state asphalt mastic and the viscosity-temperature curve y=ax+b of warm-mixed asphalt rubber cement respectively; Temperature is mixed and stirred in construction according to designing asphalt mixture, in the viscosity-temperature curve of former state asphalt mastic, can determine that viscosity is mixed and stirred in the construction of designing asphalt mixture; Viscosity is mixed and stirred in construction according to the designing asphalt mixture obtained, in the viscosity-temperature curve of warm-mixed asphalt rubber cement, instead can push away the construction obtaining Warm-Mix Bitumen Mixture and mix and stir temperature.
Following two objects can be reached by such experimental design:
By judging that temperature is mixed and stirred in the construction of compound to the test of asphalt mastic viscosity, better can simulate the mixed state in practice of construction process, more accurate on the factor location affecting bituminous mixture construction temperature, and then the construction temperature of the Warm-Mix Bitumen Mixture using surface-active warm-mixing agent can be judged accurately, the optimal design for Warm-Mix Bitumen Mixture construction technology provides strong foundation;
Still viscosity determining procedure is have employed in this programme, with the determination of mixing and stirring temperature of constructing of traditional bituminous mixture, there is close correlation, therefore can not only be used for testing and use the construction of the Warm-Mix Bitumen Mixture of surface-active warm-mixing agent to mix and stir temperature, can be applicable to use the construction of the Warm-Mix Bitumen Mixture of other types warm-mixing agent to mix and stir temperature determine simultaneously, and the warm mix effect of different warm-mixing agent can be contrasted by comparative analysis.
Provided by the inventionly a kind ofly use the construction of the Warm-Mix Bitumen Mixture of surface-active warm-mixing agent to mix and stir temperature determining method to comprise the following steps:
Step 1: take quality and be not less than the designing asphalt mixture of the homogenous quantities of 800g pitch two parts used, be all heated to 170 ~ 180 DEG C; The quality of every part is not less than 800g, the enough consumptions of follow-up viscosity test can be ensured, be all heated to 170 ~ 180 DEG C, can ensure that pitch has enough mobility and mixes with breeze, general matrix pitch temperature can get low value, and modified bitumen temperature can get high level;
Step 2: take the breeze that two parts of designing asphalt mixtures of the pitch homogenous quantities used with described designing asphalt mixture are used, be all heated to 170 ~ 180 DEG C; The quality of breeze every part is also not less than 800g, the enough consumptions of follow-up viscosity test can be ensured, be all heated to 170 ~ 180 DEG C, carry out heating to breeze and can promote and pitch evenly miscible, general matrix pitch temperature can get low value, and modified bitumen temperature can get high level;
Step 3: the pitch of step 1 is mixed according to 1:1 mass ratio with the breeze of step 2, uniform stirring 5 ~ 10min, obtains two parts of former state asphalt mastics; Stir 5 ~ 10min, can ensure that breeze mixes with pitch, general matrix pitch mixing time can get low value, and the modified asphalt-stirring time can get high level;
Step 4: a copy of it former state asphalt mastic that selecting step 3 obtains, the ratio that asphalt mastic and surface-active warm-mixing agent mass ratio are 1000:5 ~ 10 as it is takes surface-active warm-mixing agent and mixes with former state asphalt mastic, uniform stirring 5 ~ 10min; The adding proportion of surface-active warm-mixing agent, the use volume (mass ratio of surface-active warm-mixing agent and pitch) recommended according to surface-active warm-mixing agent calculates the required surface-active warm-mixing agent consumption added of asphalt mastic, take surface-active warm-mixing agent and mix with former state asphalt mastic, uniform stirring 5 ~ 10min, can ensure that surface-active warm-mixing agent mixes with former state asphalt mastic, if former state asphalt mastic uses matrix pitch to get low value, if former state asphalt mastic uses modified bitumen to get high level;
Step 5: according to Li Qingbushi rotary viscosity test, optional two temperature within the scope of 120 DEG C ~ 180 DEG C, test the viscosity of former state asphalt mastic and warm-mixed asphalt rubber cement respectively, the interval of two temperature of selection should lower than 30 DEG C; The Li Qingbushi rotary viscosity test (T0625-2000) that Li Qingbushi rotary viscosity test specifies with " highway engineering pitch and Asphalt Mixture Experiment code " (JTJ052-2000) is for standard, and the interval of two temperature of selection should lower than 30 DEG C;
Step 6: take probe temperature as x value, with the viscosity of correspondence for y value, draws the viscosity-temperature curve of former state asphalt mastic and the viscosity-temperature curve y=ax+b of warm-mixed asphalt rubber cement respectively;
Step 7: temperature is mixed and stirred in the construction according to designing asphalt mixture, in the viscosity-temperature curve of the former state asphalt mastic of step 6 acquisition, determines that viscosity is mixed and stirred in the construction of designing asphalt mixture;
Step 8: viscosity is mixed and stirred in the construction according to the designing asphalt mixture of step 7 acquisition, in the viscosity-temperature curve of the warm-mixed asphalt rubber cement of step 6 acquisition, temperature is mixed and stirred in the anti-construction pushing away acquisition Warm-Mix Bitumen Mixture.
Described take designing asphalt mixture asphalt quality used is 800 ~ 1000g.
Described test former state asphalt mastic and the temperature of warm-mixed asphalt cement viscosity are 135 DEG C of viscosity and 175 DEG C of viscosity.
Application example: testing method of the present invention obtains effective checking in entity project.Around the urban express way that traffic main hinge in southern station, Nanjing is built, in order to ensure pavement performance, design have employed SMA13 bituminous mixture, but because construction seasons temperature is relatively low, and in order to avoid the flue gas in work progress is on the impact of surrounding environment, therefore determine that temperature is mixed and stirred in the construction adopting warm mix technology to reduce SMA13 compound.Mix and stir temperature according to the construction of testing method of the present invention to the Warm-Mix Bitumen Mixture using surface-active warm-mixing agent to determine, and be optimized design according to the construction technology condition of result of the test to scene of detection method, ensure good construction quality.In this entity project,
The concrete implementation step of test method of the present invention is as follows:
Step 1: taking quality is the design SMA bituminous mixture of the homogenous quantities of 1000g pitch two parts used, is all heated to 180 DEG C;
Step 2: take the breeze used with the described two parts of designing asphalt mixtures designing SMA bituminous mixture pitch homogenous quantities used, be all heated to 180 DEG C;
Step 3: the pitch of step 1 is mixed according to 1:1 mass ratio with the breeze of step 2, uniform stirring 10min, obtains two parts of former state asphalt mastics;
Step 4: a copy of it former state asphalt mastic that selecting step 3 obtains, it is 6g that the use volume (mass ratio of surface-active warm-mixing agent and pitch is 1000:6) recommended according to surface-active warm-mixing agent calculates the required surface-active warm-mixing agent consumption added of asphalt mastic, take surface-active warm-mixing agent 6g and mix with former state asphalt mastic, uniform stirring 10min, obtains warm-mixed asphalt rubber cement;
Step 5: according to Li Qingbushi rotary viscosity test, 135 DEG C and 175 DEG C of two probe temperatures are selected within the scope of 120 DEG C ~ 180 DEG C, test the viscosity of former state asphalt mastic and warm-mixed asphalt rubber cement respectively, the viscosity of former state asphalt mastic is as shown in table 1, and the viscosity of warm-mixed asphalt rubber cement is as shown in table 2;
Table 1
| Temperature/DEG C | 175 | 135 |
| Viscosity/Pa.s | 17.52 | 53.68 |
Table 2
| Temperature/DEG C | 175 | 135 |
| Viscosity/Pa.s | 16.54 | 50.01 |
Step 6: with probe temperature T for x value, with the viscosities il of correspondence for y value, draw the viscosity-temperature curve of former state asphalt mastic and the viscosity-temperature curve y=ax+b of warm-mixed asphalt rubber cement respectively, as shown in Figure 1, the viscosity-temperature curve of warm-mixed asphalt rubber cement as shown in Figure 2 for the viscosity-temperature curve of former state asphalt mastic;
Step 7: mixing and stirring temperature according to the construction of design SMA13 bituminous mixture is 160 DEG C, in the viscosity-temperature curve of the former state asphalt mastic of step 6 acquisition, determines that viscosity 31.08Pa.s is mixed and stirred in the construction of designing asphalt mixture;
Step 8: viscosity 31.08Pa.s is mixed and stirred in the construction according to the design SMA13 bituminous mixture of step 7 acquisition, in the viscosity-temperature curve of the warm-mixed asphalt rubber cement of step 6 acquisition, it is 137 DEG C that temperature is mixed and stirred in the anti-construction pushing away acquisition warm mix SMA13 bituminous mixture, is taken as 140 DEG C in entity project.
Entity project application example shows, provided by the inventionly a kind ofly the construction of the Warm-Mix Bitumen Mixture of surface-active warm-mixing agent is used to mix and stir temperature determining method, data accurately and reliably, easy to operate feasible, be easy to realize, thus select to provide reliable basis with design for the construction technology condition of on-the-spot Warm-Mix Bitumen Mixture, and then ensure good construction quality.Therefore, method for testing and detecting of the present invention has very good application and popularization value.
Claims (3)
1. use the construction of the Warm-Mix Bitumen Mixture of surface-active warm-mixing agent to mix and stir a temperature determining method, it is characterized in that, comprise the steps:
Step 1: take quality and be not less than the designing asphalt mixture of the homogenous quantities of 800g pitch two parts used, be all heated to 170 ~ 180 DEG C;
Step 2: take the breeze that two parts of designing asphalt mixtures of the pitch homogenous quantities used with described designing asphalt mixture are used, be all heated to 170 ~ 180 DEG C;
Step 3: the pitch of step 1 is mixed according to 1:1 mass ratio with the breeze of step 2, uniform stirring 5 ~ 10min, obtains two parts of former state asphalt mastics;
Step 4: a copy of it former state asphalt mastic that selecting step 3 obtains, the ratio that asphalt mastic and surface-active warm-mixing agent mass ratio are 1000: 5 ~ 10 as it is takes surface-active warm-mixing agent and mixes with former state asphalt mastic, uniform stirring 5 ~ 10min;
Step 5: according to Li Qingbushi rotary viscosity test, optional two temperature within the scope of 120 DEG C ~ 180 DEG C, test the viscosity of former state asphalt mastic and warm-mixed asphalt rubber cement respectively, the interval of two temperature of selection should lower than 30 DEG C;
Step 6: take probe temperature as x value, with the viscosity of correspondence for y value, draws the viscosity-temperature curve of former state asphalt mastic and the viscosity-temperature curve y=ax+b of warm-mixed asphalt rubber cement respectively;
Step 7: temperature is mixed and stirred in the construction according to designing asphalt mixture, in the viscosity-temperature curve of the former state asphalt mastic of step 6 acquisition, determines that viscosity is mixed and stirred in the construction of designing asphalt mixture;
Step 8: viscosity is mixed and stirred in the construction according to the designing asphalt mixture of step 7 acquisition, in the viscosity-temperature curve of the warm-mixed asphalt rubber cement of step 6 acquisition, temperature is mixed and stirred in the anti-construction pushing away acquisition Warm-Mix Bitumen Mixture.
2. temperature determining method is mixed and stirred in the construction of the Warm-Mix Bitumen Mixture of use surface-active warm-mixing agent according to claim 1, it is characterized in that: described take designing asphalt mixture asphalt quality used is 800 ~ 1000g.
3. temperature determining method is mixed and stirred in the construction of the Warm-Mix Bitumen Mixture of use surface-active warm-mixing agent according to claim 1, it is characterized in that: described test former state asphalt mastic and the temperature of warm-mixed asphalt cement viscosity are 135 DEG C and 175 DEG C.
Priority Applications (1)
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| CN105842121B (en) * | 2016-03-18 | 2018-07-24 | 交通运输部公路科学研究所 | Asphalt based on wetting theory most preferably mixes and stirs temperature determining method |
| CN107059548B (en) * | 2017-02-16 | 2019-03-22 | 昆山市交通工程集团有限公司 | A kind of bituminous concrete winter construction method |
| CN110396420B (en) * | 2019-08-08 | 2021-05-18 | 平顶山东晟高科实业有限公司 | Additive adding process in asphalt refining process |
| CN111366498B (en) * | 2020-03-30 | 2022-05-13 | 东南大学 | Method for determining optimal foaming condition of modified asphalt through viscosity |
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