CN103553444B - Modified bituminous concrete with self-regulating temperature function - Google Patents
Modified bituminous concrete with self-regulating temperature function Download PDFInfo
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- CN103553444B CN103553444B CN201310517396.2A CN201310517396A CN103553444B CN 103553444 B CN103553444 B CN 103553444B CN 201310517396 A CN201310517396 A CN 201310517396A CN 103553444 B CN103553444 B CN 103553444B
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Abstract
The invention provides modified bituminous concrete with a self-regulating temperature function. The modified bituminous concrete is prepared from the following raw materials in parts by weight: 100 parts of mineral aggregate, 3-7 parts of asphalt, 0.2-2.4 parts of sepiolite powder, 0.1-2.0 parts of palygorskite powder, and 0.01-0.06 part of coupling agent, wherein the coupling agent is a titanate coupling agent or an aluminate coupling agent; the aggregate grading type of the mineral aggregate is AM-13, GAC-13, AC-13, SMA-13 or OGFC-13. According to the modified bituminous concrete provided by the invention, excellent characteristics of sepiolite and palygorskite are reasonably utilized; the usability of a bituminous concrete pavement can be effectively improved; the temperature of the bituminous concrete pavement can be reduced under a high-temperature condition; a track disease is reduced; the bituminous concrete pavement can keep high temperature to resist a low-temperature disease under a low-temperature condition.
Description
Technical field
The invention belongs to road bitumen technical field, be specifically related to a kind of modified asphalt concrete with temp auto-controlled function.
Background technology
Bituminous concrete pavement is as topmost pavement of road form, in use, due to the characteristic of itself, there is comparatively general high temperature rut and cold cracking problem, these two kinds diseases relevant with temperature account for more than 90% of Asphalt Pavement Damage, have a strong impact on road-ability and road service quality, the crack that cold cracking produces also can cause stress concentration under Driving Loading and thereupon more serious crack phenomenon, simultaneously, the existence in crack is oozed under being easy to cause water, produce Moisture Damage phenomenon, destroy pavement structure, circulate and so forth, have a strong impact on Road Service Life.Therefore, the solution high temperature rut relevant with temperature and cold cracking phenomenon are still the theme of current Research on Bituminous Pavement.
At present, when solving the rut problem of bituminous pavement, mainly take the technical measures improving stability at high temperature of asphalt mixture; When solving Pavement Low disease problem, main technical measures such as employing heated bitumen or the shutoff of the emulsified bitumen cementation of fissures, making sealing and cover etc.Engineering practice proves that the application of these technology fundamentally can not solve rut and low temperature disease problem.In recent years, inorganic mineral improves as limestone powder the focus that bituminous concrete performance has become highway research.Inorganic modifier has the series of advantages such as safety, environmental protection, cost are low, easy construction, and existing scholar expands research to the inorganic limestone powder of pitch, and has adopted inorganic materials to improve Pavement of Asphalt Road Performance.Therefore, with inorganic mineral class for research direction, develop a kind of modified asphalt concrete with temp auto-controlled function to high temperature disease and the low temperature disease of alleviating bituminous concrete pavement, keep road construction Sustainable development to have vital meaning.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, provides a kind of modified asphalt concrete with temp auto-controlled function.This bituminous concrete Appropriate application good characteristic of sepiolite and polygorskite, effectively can improve the use properties of bituminous pavement, under the high temperature conditions, bituminous concrete pavement temperature can be reduced, reduce rut disease, under cryogenic, bituminous concrete pavement can be made to keep higher temperature to resist low temperature disease.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of modified asphalt concrete with temp auto-controlled function, it is characterized in that, be made up of the raw material of following weight part: mineral aggregate 100 parts, pitch 3 ~ 7 parts, sepiolite powder 0.2 ~ 2.4 part, 0.1 ~ 2.0 part, polygorskite powder, coupling agent 0.01 ~ 0.06 part, described coupling agent is titanate coupling agent or aluminate coupling agent, and the gradation types of described mineral aggregate is AM-13 type, GAC-13 type, AC-13 type, SMA-13 type or OGFC-13 type.
Above-mentioned a kind of modified asphalt concrete with temp auto-controlled function, is characterized in that, be made up of the raw material of following weight part: mineral aggregate 100 parts, pitch 4 ~ 5.2 parts, sepiolite powder 0.4 ~ 1.6 part, 0.4 ~ 1.8 part, polygorskite powder, coupling agent 0.02 ~ 0.04 part.
Above-mentioned a kind of modified asphalt concrete with temp auto-controlled function, is characterized in that, be made up of the raw material of following weight part: mineral aggregate 100 parts, pitch 4.6 parts, sepiolite 1 part, polygorskite 1.2 parts, coupling agent 0.03 part.
Above-mentioned a kind of modified asphalt concrete with temp auto-controlled function, is characterized in that, described pitch is bi tumenf orr oad, coal-tar pitch, SBS modifying asphalt, SBR modifying asphalt or natural rubber modifying asphalt.
Above-mentioned a kind of modified asphalt concrete with temp auto-controlled function, it is characterized in that, the particle diameter of described sepiolite powder and polygorskite powder is all less than 0.075mm.
Described weight part can be two, jin, gram, kilogram, Dun Deng weight metering unit.
The preparation method that the present invention has the modified asphalt concrete of temp auto-controlled function comprises the following steps:
Step one, sepiolite powder and polygorskite powder are mixed after add in coupling agent and stir, be then placed in loft drier, be dry 2h ~ 3h under the condition of 160 DEG C ~ 180 DEG C in temperature, obtain modified powder;
Step 2, modified powder described in the breeze in mineral aggregate and step one to be mixed, obtain mixed powder;
Step 3, by asphalt heating to 140 DEG C ~ 170 DEG C, is heated to 180 DEG C ~ 200 DEG C gathering materials in mineral aggregate, then the pitch after heating was joined in gathering materials after heating and mix and stir 90s, finally add mixed powder described in step 2, continue to mix and stir 90s ~ 100s, obtain the modified asphalt concrete with temp auto-controlled function.
The another kind of preparation method that the present invention has the modified asphalt concrete of temp auto-controlled function comprises the following steps:
Step one, sepiolite powder and polygorskite powder are mixed after add in coupling agent and stir, be then placed in loft drier, be dry 2h ~ 3h under the condition of 160 DEG C ~ 180 DEG C in temperature, obtain modified powder;
Step 2, by asphalt heating to 140 DEG C ~ 170 DEG C, then modified powder described in step one is joined in the pitch after heating and mix and stir 90s;
Step 3, gathering materials in mineral aggregate is heated to 180 DEG C ~ 200 DEG C, then the pitch mixing and stirring modified powder in step 2 is joined in gathering materials after heating and mix and stir 90s, finally add the breeze in mineral aggregate, continue to mix and stir 90s ~ 100s, obtain the modified asphalt concrete with temp auto-controlled function.
The application process that the present invention has the modified asphalt concrete of temp auto-controlled function comprises the following steps:
Step one, the earth removing road surface to be laid, foreign material etc., ensure the road surface to be laid not obvious defect such as polishing, deformation, check crack, then spreading emulsified bitumen;
Step 2, be transported to working-yard under the condition of 160 DEG C ~ 180 DEG C in temperature by modified asphalt concrete of the present invention, note keeping temperature, and note the generation that prevents from emanating;
Step 3, pour modified asphalt concrete of the present invention into paver and pave, adopt street roller that the bituminous concrete paved is carried out compacting.
The present invention compared with prior art has the following advantages:
1, sepiolite and polygorskite is added with in modified asphalt concrete of the present invention, sepiolite is the silicate minerals that one has the transition type structure of 2: 1 type chains and stratiform, due to the structural performance that it is special, sepiolite has good heat insulation function and thermostability, when external temperature raises, sepiolite can stop heat further to transmit, and makes concrete internal temperature remain on lower state, when outside temperature is lower, sepiolite can stop again scattering and disappearing of concrete internal temperature.And polygorskite inside has comparatively concrete dynamic modulus, there is very large specific surface area and good adsorptive power, and rheological and catalytic performance excellent, also there is desirable colloidal property and resistance toheat, sepiolite can be made better to be scattered in bituminous concrete, and the performance of sepiolite temp auto-controlled function can be promoted.The present invention makes full use of the synergy of sepiolite and polygorskite, can significantly play temp auto-controlled function, under the high temperature conditions, can reduce the pavement temperature of bituminous concrete, reduces rut disease; Under middle cold condition, the temperature that bituminous concrete pavement can be made to keep higher, resists low temperature disease.
2, be added with sepiolite and polygorskite in modified asphalt concrete of the present invention, sepiolite and polygorskite are not only pollution-free, and also have higher mechanochemistry stability, and there is not saturation limit, sustainable use, repeating utilization factor is higher, and weather resistance is strong; In addition, the Mineral Resource of China's sepiolite and polygorskite is very abundant, and buying is convenient, and Exploitative potential is very large.
3, the present invention has the advantages such as preparation method is simple, production cost is low, temp auto-controlled Be very effective, effectively can improve the use properties of bituminous concrete pavement.
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment
Mineral aggregate in modified asphalt concrete of the present invention meets the associated specifications of JTG-F40-2004 " standard specification for construction and acceptance of highway asphalt pavement ", mineral aggregate by gather materials and breeze form, the grouan wherein gathered materials for particle diameter 0.075mm ~ 16mm gathers materials, basalt aggregate, diabase gather materials or limestone aggregates, and breeze is the limestone powder that particle diameter is less than 0.075mm.
Embodiment 1
The present embodiment has the modified asphalt concrete of temp auto-controlled function, is made up of the raw material of following weight part: mineral aggregate 100 parts, pitch 4.6 parts, sepiolite powder 1 part, 1.2 parts, polygorskite powder, coupling agent 0.03 part; Described pitch is SBS modifying asphalt, and described coupling agent is titanate coupling agent, and the particle diameter of described sepiolite powder and polygorskite powder is all less than 0.075mm, and the gradation types of described mineral aggregate is AM-13 type (concrete gradation composition is in table 1).
The gradation composition of table 1 AM-13 type
The preparation method of the present embodiment modified asphalt concrete comprises the following steps:
Step one, sepiolite powder and polygorskite powder are mixed after add in coupling agent and stir, be then placed in loft drier, be dry 3h under the condition of 180 DEG C in temperature, obtain modified powder;
Step 2, modified powder described in the breeze in mineral aggregate and step one to be mixed, obtain mixed powder;
Step 3, by asphalt heating to 170 DEG C, gathering materials in mineral aggregate is heated to 200 DEG C, then the pitch after heating was joined in gathering materials after heating and mix and stir 90s, finally add mixed powder described in step 2, continue to mix and stir 90s, obtain the modified asphalt concrete with temp auto-controlled function.
Embodiment 2
The present embodiment has the modified asphalt concrete of temp auto-controlled function, is made up of the raw material of following weight part: mineral aggregate 100 parts, pitch 3 parts, sepiolite 2.4 parts, polygorskite 0.1 part, coupling agent 0.01 part; Described pitch is bi tumenf orr oad, and described coupling agent is aluminate coupling agent, and the particle diameter of described sepiolite powder and polygorskite powder is all less than 0.075mm, and the gradation types of described mineral aggregate is GAC-13 type (concrete gradation composition is in table 2).
The gradation composition of table 2 GAC-13 type
The preparation method of the present embodiment modified asphalt concrete comprises the following steps:
Step one, sepiolite powder and polygorskite powder are mixed after add in coupling agent and stir, be then placed in loft drier, be dry 2h under the condition of 160 DEG C in temperature, obtain modified powder;
Step 2, modified powder described in the breeze in mineral aggregate and step one to be mixed, obtain mixed powder;
Step 3, by asphalt heating to 140 DEG C, gathering materials in mineral aggregate is heated to 200 DEG C, then the pitch after heating was joined in gathering materials after heating and mix and stir 90s, finally add mixed powder described in step 2, continue to mix and stir 90s, obtain the modified asphalt concrete with temp auto-controlled function.
Embodiment 3
The present embodiment has the modified asphalt concrete of road surface cooling function, is made up of the raw material of following weight part: mineral aggregate 100 parts, pitch 7 parts, sepiolite 0.2 part, polygorskite 2.0 parts, coupling agent 0.06 part; Described pitch is coal-tar pitch, and described coupling agent is aluminate coupling agent, and the particle diameter of described sepiolite powder and polygorskite powder is all less than 0.075mm, and the gradation types of described mineral aggregate is AC-13 type (concrete gradation composition is in table 3).
The gradation composition of table 3 AC-13 type
The preparation method of the present embodiment modified asphalt concrete comprises the following steps:
Step one, sepiolite powder and polygorskite powder are mixed after add in coupling agent and stir, be then placed in loft drier, be dry 3h under the condition of 180 DEG C in temperature, obtain modified powder;
Step 2, modified powder described in the breeze in mineral aggregate and step one to be mixed, obtain mixed powder;
Step 3, by asphalt heating to 140 DEG C, gathering materials in mineral aggregate is heated to 200 DEG C, then the pitch after heating was joined in gathering materials after heating and mix and stir 90s, finally add mixed powder described in step 2, continue to mix and stir 100s, obtain the modified asphalt concrete with temp auto-controlled function.
Embodiment 4
The present embodiment has the modified asphalt concrete of road surface cooling function, is made up of the raw material of following weight part: mineral aggregate 100 parts, pitch 4 parts, sepiolite 0.4 part, polygorskite 0.4 part, coupling agent 0.02 part; Described pitch is SBR modifying asphalt, and described coupling agent is aluminate coupling agent, and the particle diameter of described sepiolite powder and polygorskite powder is all less than 0.075mm, and the gradation types of described mineral aggregate is SMA-13 type (concrete gradation composition is in table 4).
Table 4 SMA-13 type bituminous concrete gathers materials formate gradation composition
The preparation method of the present embodiment modified asphalt concrete comprises the following steps:
Step one, sepiolite powder and polygorskite powder are mixed after add in coupling agent and stir, be then placed in loft drier, be dry 3h under the condition of 180 DEG C in temperature, obtain modified powder;
Step 2, by asphalt heating to 170 DEG C, then modified powder described in step one is joined in the pitch after heating and mix and stir 90s;
Step 3, gathering materials in mineral aggregate is heated to 200 DEG C, then the pitch mixing and stirring modified powder in step 2 is joined in gathering materials after heating and mix and stir 90s, finally add the breeze in mineral aggregate, continue to mix and stir 100s, obtain the modified asphalt concrete with temp auto-controlled function.
Embodiment 5
The present embodiment has the modified asphalt concrete of road surface cooling function, is made up of the raw material of following weight part: mineral aggregate 100 parts, pitch 5.2 parts, sepiolite 1.6 parts, polygorskite 1.8 parts, coupling agent 0.04 part; Described pitch is natural rubber pitch, and described coupling agent is titanate coupling agent, and the particle diameter of described sepiolite powder and polygorskite powder is all less than 0.075mm, and the gradation types of described mineral aggregate is OGFC-13 type (concrete gradation composition is in table 5).
The gradation composition of table 5 OGFC-13 type
The preparation method of the present embodiment modified asphalt concrete comprises the following steps:
Step one, sepiolite powder and polygorskite powder are mixed after add in coupling agent and stir, be then placed in loft drier, be dry 2h under the condition of 180 DEG C in temperature, obtain modified powder;
Step 2, by asphalt heating to 140 DEG C, then modified powder described in step one is joined in the pitch after heating and mix and stir 90s;
Step 3, gathering materials in mineral aggregate is heated to 200 DEG C, then the pitch mixing and stirring modified powder in step 2 is joined in gathering materials after heating and mix and stir 90s, finally add the breeze in mineral aggregate, continue to mix and stir 90s, obtain the modified asphalt concrete with temp auto-controlled function.
According to the associated specifications of the Ministry of Communications ministerial standard JTG E20-2011 " highway engineering pitch and Asphalt Mixture Experiment code ", the performance of the embodiment of the present invention 1 to 5 modified asphalt concrete is verified by following test.
One, pavement performance
Wheel tracking test, low-temperature bending test (-10 DEG C), indirect tensile test on frozen-thaw and immersion Marshall test are all carried out to embodiment 1 to 5 modified asphalt concrete, the pavement performance of test bituminous concrete, and be analyzed with the performance of the asphalt concrete not adding sepiolite or polygorskite, test-results is in table 6.
Table 6 temp auto-controlled concrete road performance test results
As can be seen from Table 6, modified asphalt concrete of the present invention meets " standard specification for construction and acceptance of highway asphalt pavement " (JTG F40-2004) related request, the indexs such as its high-temperature behavior, low-temperature performance, water stabilizing, apparently higher than asphalt concrete, show that the pavement performance of bituminous concrete of the present invention is superior.
Two, rut plate temperature test
The employing embodiment of the present invention 1 to 5 modified asphalt concrete respectively preparation size is the rut plate of 30cm × 30cm × 5cm, under rut plate is positioned over outdoor environment simultaneously, the temperature on the surface of test rut plate, the temperature variation of simulation bituminous concrete pavement, and carry out performance comparison with the asphalt concrete not adding sepiolite and polygorskite.Test-results under the hot environment selected is in table 7, and the test-results of winter low temperature is in table 8.
The rut plate temperature test-results of table 7 hot environment
The rut plate temperature test-results of table 8 low temperature environment
As can be seen from Table 7, when envrionment temperature is higher, the surface temperature of the shaping rut plate of modified asphalt concrete of the present invention is adopted to be starkly lower than the surface temperature of the shaping rut plate of asphalt concrete.As can be seen from Table 8, when envrionment temperature is lower, the surface temperature of the rut plate adopting modified asphalt concrete of the present invention shaping will apparently higher than envrionment temperature.In sum, the bituminous concrete that prepared by the present invention has temp auto-controlled function under various circumstances.
The above; it is only preferred embodiment of the present invention; not any restriction is done to the present invention, every above embodiment is done according to invention technical spirit any simple modification, change and equivalent structure change, all still belong in the protection domain of technical solution of the present invention.
Claims (4)
1. one kind has the modified asphalt concrete of temp auto-controlled function, it is characterized in that, be made up of the raw material of following weight part: mineral aggregate 100 parts, pitch 4 ~ 5.2 parts, sepiolite powder 0.4 ~ 1.6 part, 0.4 ~ 1.8 part, polygorskite powder, coupling agent 0.02 ~ 0.04 part, described coupling agent is titanate coupling agent or aluminate coupling agent, and the gradation types of described mineral aggregate is AM-13 type, GAC-13 type, AC-13 type, SMA-13 type or OGFC-13 type.
2. a kind of modified asphalt concrete with temp auto-controlled function according to claim 1, is characterized in that, be made up of the raw material of following weight part: mineral aggregate 100 parts, pitch 4.6 parts, sepiolite 1 part, polygorskite 1.2 parts, coupling agent 0.03 part.
3. a kind of modified asphalt concrete with temp auto-controlled function according to claim 1 and 2, is characterized in that, described pitch is bi tumenf orr oad, coal-tar pitch, SBS modifying asphalt, SBR modifying asphalt or natural rubber modifying asphalt.
4. a kind of modified asphalt concrete with temp auto-controlled function according to claim 1 and 2, it is characterized in that, the particle diameter of described sepiolite powder and polygorskite powder is all less than 0.075mm.
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| CN1775865A (en) * | 2005-12-13 | 2006-05-24 | 武汉理工大学 | Laminated silicate clay nano modified alphalt and its preparing method |
| EP2216370A1 (en) * | 2009-02-06 | 2010-08-11 | Shell Internationale Research Maatschappij B.V. | Asphalt |
| CN102745947A (en) * | 2012-08-07 | 2012-10-24 | 甘肃土木工程科学研究院 | Modified asphalt mixture |
| CN102849990A (en) * | 2012-09-29 | 2013-01-02 | 长安大学 | Modified asphalt concrete with road surface cooling function |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2562094B2 (en) * | 1992-05-27 | 1996-12-11 | 株式会社白石中央研究所 | Granular asphalt containing inorganic particles and method for producing the same |
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Patent Citations (4)
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| CN1775865A (en) * | 2005-12-13 | 2006-05-24 | 武汉理工大学 | Laminated silicate clay nano modified alphalt and its preparing method |
| EP2216370A1 (en) * | 2009-02-06 | 2010-08-11 | Shell Internationale Research Maatschappij B.V. | Asphalt |
| CN102745947A (en) * | 2012-08-07 | 2012-10-24 | 甘肃土木工程科学研究院 | Modified asphalt mixture |
| CN102849990A (en) * | 2012-09-29 | 2013-01-02 | 长安大学 | Modified asphalt concrete with road surface cooling function |
Non-Patent Citations (1)
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