CN103613326A - High-modulus cold-mix asphalt mixture used for road and its preparation method - Google Patents
High-modulus cold-mix asphalt mixture used for road and its preparation method Download PDFInfo
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Abstract
The invention relates to a high-modulus cold-mix asphalt mixture used for road and its preparation method. The high-modulus cold-mix asphalt mixture used for road comprises the following raw materials by volume ratio: 71-89.5% of basalt aggregates; 1-4.5% of limestone ore powder; 7-10% of SBS modified cation emulsified asphalt; 1-3% of ordinary portland cement; 1.5-8.5% of chrome tanning leather sawdust and 0-3% of water. The preparation method comprises the following steps: mixing the basalt aggregates and the chrome tanning leather sawdust with particle size of 0.075mm-0.30mm; adding limestone ore powder and the chrome tanning leather sawdust with particle size less than 0.075mm; and finally adding the SBS modified cation emulsified asphalt and water for uniformly mixing. The high-modulus cold-mix asphalt mixture used for road fully uses the sawdust generated in a chrome tanning leather factory, performance requirement of a mixture used for road is satisfied, static pressure modulus of the asphalt mixture is obviously increased, and the high-modulus cold-mix asphalt mixture enables popularization and application in hot and humid environment and in a bituminous paving engineering which easily generates rut damage.
Description
Technical field
The invention belongs to road engineering technical field, particularly high-modulus cold-mix asphalt compound and preparation method thereof for a kind of road.
Background technology
In recent years, along with the continuous expansion of Chinese Highway construction scale of projects, highway asphalt engineering is subject to the damp and hot climatic influences that wait of high temperature also to come more remarkable; On the other hand, in recent years, the overloading of vehicle also received much concern, and weather resistance and the security of consequent asphalt pavement rut road pavement have produced considerable influence.
Cold-mix asphalt compound refers to mix at normal temperatures, and the asphalt of making under normal temperature, also can make cold laid asphaltic compound, has the advantages such as energy-conserving and environment-protective, constructability.Cold-mix asphalt compound binder used is emulsified bitumen.For save energy; protection of the environment; improve workman's labor condition; in recent years, the widespread use in the newly-built and maintenance project of highway pavement at home and abroad of such compound, but due to the existence of moisture in emulsified bitumen; easily cause asphalt mastic intensity and compound medium pitch and the adhesive capacity of gathering materials to decline; thereby the mechanical index such as static pressure modulus of cold-mix asphalt compound are reduced, further cause compound to produce larger temperature and drying shrinkage deformation, the work-ing life of seriously having reduced highway engineering.
For bituminous pavement high temperature is damp and hot, wait with overload the rut problem causing, domestic and international scientific research personnel utilizes polymeric additive to develop heat and mixes High Modulus Asphalt Mixture, in bituminous coat project, be widely applied.On the other hand, in order to improve the modulus of cold-mix asphalt compound, scientific research personnel also improves by technique means such as admixture cement; But still there are the following problems:
The first, the polymeric additive complex manufacturing of mixing High Modulus Asphalt Mixture for heat, production technology is difficult to grasp, the external import of the many dependence of current highway High Modulus Bituminous Mixtures Additive.
The second, polymeric additive cost is higher, has obviously improved the price of asphalt, thereby has improved asphalt highway construction costs.
The 3rd, existing cold-mix asphalt compound relies on interpolation silicate cement to improve its compression modulus more; Yet too much silicate cement consumption easily causes compound water requirement large, too much hydrolysis product of cement can obviously increase compound fragility, causes compound that the endurance issues such as cracking and contraction easily occur.
Summary of the invention
For traditional asphalt compound, under the damp and hot and overload condition of high temperature, easily produce the problems such as rut, the object of the invention is to, a kind of road cold-mix asphalt compound that higher static pressure modulus and other performance index meet the demands that has is provided.
Road provided by the invention with high-modulus cold-mix asphalt compound by following raw materials according by volume per-cent form: basalt aggregate: 71%～89.5%, limestone breeze: 1%～4.5%, SBS modified cation emulsified bitumen: 7%～10%; Ordinary Portland cement: 1%～3%; Chrome tanning leather sawdust: 1.5%～8.5%; Water: 0～3%; The volume percent sum of above-mentioned raw materials is 100%;
Wherein, the particle size range of basalt aggregate is 0.075mm～13.2mm, the size distribution of chrome tanning leather sawdust is: the chrome tanning leather sawdust that particle diameter is (0.15～0.30) mm: 0.5%～3.0%, particle diameter is the chrome tanning leather sawdust of (0.075～0.15) mm: 0.5%～3.5%, and particle diameter is less than the chrome tanning leather sawdust of 0.075mm: 0.5%～2.0%.
Preferably, road with high-modulus cold-mix asphalt compound by following raw materials according by volume per-cent form: basalt aggregate: 77%～86%, limestone breeze: 1%～1.5%, SBS modified cation emulsified bitumen: 7%～9%; Ordinary Portland cement: 2%～3%; Particle diameter is the chrome tanning leather sawdust of (0.15～0.30) mm: 1.0%～2.5%, particle diameter is the chrome tanning leather sawdust of (0.075～0.15) mm: 1.0%～3.0%, particle diameter is less than the chrome tanning leather sawdust of 0.075mm: 1.0%～2.0%, water: 1%～2%, the volume percent sum of above-mentioned raw materials is 100%.
The preparation method of high-modulus cold-mix asphalt compound for described road, comprises the following steps:
The chrome tanning leather sawdust that is first 0.075mm～0.30mm by basalt aggregate and particle diameter mixes; Add again limestone breeze and particle diameter to be less than 0.075mm chrome tanning leather sawdust; Finally add SBS modified cation emulsified bitumen and water uniform mixing.
Road of the present invention has the following advantages with high-modulus cold-mix asphalt compound tool:
Make full use of industrial waste, promote industry byproduct and be worth, reduce High Modulus Asphalt Mixture production cost; This asphalt has higher static pressure modulus, reaches as high as 2000MPa, meets the requirement of engineering use properties.
Embodiment
The high resilience of chrome tanning leather, physical mechanical strength is good, and heat-resisting, wear-resisting, water resistant, extensibility are all good, the industry byproduct that chrome tanning leather sawdust is tannery; Therefore, the present invention makes full use of chrome tanning leather sawdust, in conjunction with cold-mix asphalt compound production technique, makes high-modulus cold-mix asphalt compound for road.
Chrome tanning leather sawdust of the present invention refers to the industry byproduct of the sawdust ，Wei chrome tanning tannery producing in tannery's cutting or processing chrome tanning leather process, and particle size range is 0.075mm～0.3mm, and is less than 0.075mm; For ease of carry out the design of compound aggregate grading according to volume ratio, it is single-row that the present invention will be less than 0.075mm chrome tanning leather sawdust, and be less than 0.075mm limestone breeze and add use simultaneously.
Basalt aggregate in material of the present invention also can be used limestone aggregates, and this depends on the use position of cold-mix asphalt compound in road surface; If for upper layer, recommendation basalt aggregate, because this hardness of gathering materials is higher, the compound wear resistance of production is better; If for lower surface layer, can use limestone or basalt aggregate, although because limestone aggregates is better with the adhesivity of pitch, its hardness is lower, if for upper layer, can cause road surface wear resistance to reduce.
Pitch in material of the present invention can not be used plain asphalt, can only use modified emulsifying asphalt, because plain asphalt can not cold mixing moulding and construction; Modified emulsifying asphalt has the kinds such as SBS and SBR modification, the comparative maturity that present stage is used for SBS modification, such modified emulsifying asphalt can meet asphalt and under high temperature and cold environmental conditions, have the requirement of better pavement performance.The type of emulsified bitumen has 3 kinds of negatively charged ion, positively charged ion and nonionics, general with cationic emulsified bitumen in highway engineering, because this emulsified bitumen particle surface is positively charged, surface of aggregate is electronegative, effect between positive and negative charge has promoted effective adhesion of pitch particle and surface of aggregate, thereby improves the whole pavement performance of compound; Therefore, the present invention has adopted SBS modified cation emulsified bitumen.
Below provide concrete preferred embodiment of the present invention, for further illustrating the present invention.These embodiment only understand the present invention fully for those skilled in the art, rather than are used for limiting the scope of the invention.Within every equivalents of carrying out on technical solution of the present invention or replacement all belong to the claimed interest field of the present invention.
Embodiment 1:
Starting material are selected: in compound cumulative volume, and basalt aggregate: 79.5%, limestone breeze: 1.5%, SBS modified cation emulsified bitumen: 8%; Ordinary Portland cement: 3%; Chrome tanning leather sawdust particle diameter (0.15～0.30) mm accounts for 2.0%, and chrome tanning leather sawdust particle diameter (0.075～0.15) mm accounts for 2.5%, and chrome tanning leather sawdust particle diameter is less than 0.075mm and accounts for 1.5%, and water accounts for 2%.
Basalt aggregate: density is 2.576g/cm
3, porosity is 2.2%, to asphalt adhesive grade, is 4 grades, and crush values is 15.0%, and particle diameter is 0.075mm～13.2mm, continuous grading;
Chrome tanning leather sawdust: particle size range is 0.075mm～0.3mm, and be less than 0.075mm, density is 0.921g/cm
3;
Limestone breeze: density is 2.701g/cm
3, without caking;
Emulsified bitumen: SBS modified cation emulsified bitumen, emulsifying agent is palmityl trimethyl ammonium chloride, on 1.18mm sieve, residual content is 0.02%, viscosity (C
25,3) be 28s, with coarse aggregate wrap area >2/3, evaporation residue content is 61%.
Cement: 42.5R ordinary Portland cement, density is 3.101g/cm
3, stability is qualified.
The aggregate grading of compound is as shown in table 1.
Table 1 aggregate grading table (volume ratio %)
According to following steps, prepare high-modulus cold-mix asphalt compound for road:
First, under 60 ℃ of conditions, respectively chrome tanning leather sawdust, limestone aggregates, limestone breeze and cement are dried 24 hours; Wherein, the particle size range of basalt aggregate is 0.075mm～13.2mm, and limestone deposit powder footpath is for being less than 0.075mm, and chrome tanning leather sawdust particle size range is 0.075mm～0.3mm and is less than 0.075mm;
Then, the chrome tanning leather sawdust that is 0.075mm～0.30mm by limestone aggregates and particle diameter mixes at ambient temperature; Add again limestone breeze and be less than 0.075mm chrome tanning leather sawdust;
Finally, add SBS modified cation emulsified bitumen and water, uniform mixing at ambient temperature, makes high-modulus cold-mix asphalt compound for road.
Embodiment 2～9:
According to high-modulus cold-mix asphalt compound for the road of the method production example 2～9 of describing in embodiment 1, raw material and nominal mix proportion thereof are as shown in table 2.
Table 2 Mixture Ratio (volume ratio %)
It is below the correlated performance test of above-described embodiment.
To the road of forming in embodiment 1～9, with high-modulus cold-mix asphalt compound, in temperature, be that under 20 ℃, the humidity condition that is 50%, maintenance, to 28d length of time, is carried out performance test according to < < highway engineering pitch and Asphalt Mixture Experiment rules > > (JTJ052-2000).
One, the mensuration of Marshall stability
Adopt marshall compaction instrument, hammer weight 4536g, free-falling height 457.2mm, on test specimen two sides, each hits real 75 times continuously.Test specimen is
right cylinder test specimen.With Marshall stability determinator, test its stability and flow valuve, test temperature is 20 ℃, and test-results sees the following form 3.
Table 3 Marshall Test result
| Sequence number | Stability (kN) | Flow valuve (mm) |
| Embodiment 1 | 13.9 | 2.68 |
| Embodiment 2 | 11.7 | 2.57 |
| Embodiment 3 | 10.6 | 2.29 |
| Embodiment 4 | 10.9 | 2.44 |
| Embodiment 5 | 9.4 | 3.01 |
| Embodiment 6 | 11.9 | 2.51 |
| Embodiment 7 | 8.1 | 2.90 |
| Embodiment 8 | 9.8 | 2.79 |
| Embodiment 9 | 8.3 | 2.21 |
Two, the mensuration of isostatic pressing strength
Test specimen adopts the right cylinder test specimen of hydrostatic profile, and diameter is 100mm ± 2.0mm, and height is 100 ± 2.0mm.Test temperature is 20 ℃, and loading rate is 2mm/min, and test-results is as shown in table 4.
Table 4 isostatic pressing strength test-results
| Embodiment sequence number | Isostatic pressing strength (MPa) |
| Embodiment 1 | 2.01 |
| Embodiment 2 | 1.85 |
| Embodiment 3 | 1.67 |
| Embodiment 4 | 1.70 |
| Embodiment 5 | 1.45 |
| Embodiment 6 | 1.92 |
| Embodiment 7 | 1.01 |
| Embodiment 8 | 1.55 |
| Embodiment 9 | 1.34 |
Three, the mensuration of dynamic stability
Rut board size is 300mm * 300mm * 50mm.Test rolling instrument and Measuring Device adopt HLR-3 type asphalt rolling forming machine and the dual-purpose wheel rutting test machine in HLR-3 type asphalt water route.It is 42 times/min that experimental wheel comes and goes rolling speed, and test temperature is 60 ℃, and test-results is as shown in table 5.
Table 5 dynamic stability test result
| Embodiment sequence number | Dynamic stability (inferior/mm) |
| Embodiment 1 | 6210 |
| Embodiment 2 | 5682 |
| Embodiment 3 | 5121 |
| Embodiment 4 | 5325 |
| Embodiment 5 | 4828 |
| Embodiment 6 | 5320 |
| Embodiment 7 | 3321 |
| Embodiment 8 | 3833 |
| Embodiment 9 | 3431 |
Four, the mensuration of freeze thawing Ratio of split strength
Test adopts the standard cylinder test specimen of Marshall compaction method moulding.Test temperature is 20 ℃, and loading rate is 50mm/min.Test apparatus is that pavement strength instrument and two width are 12.7mm, the metal bead that inner side radius-of-curvature is 75mm.According to formula, 2. and 3. calculate the tensile splitting strength of compound.
In (formula 1) and (formula 2): RT
1-do not carry out the cleavage strength of the 1st group of test specimen of freeze-thaw cycle, MPa; RT
2-stand the cleavage strength of the 2nd group of test specimen of freeze-thaw cycle, MPa; PT
1the trial load maximum value of-the 1 group of test specimen, N; PT
2the trial load maximum value of-the 2 group of test specimen, N; h
1the center line average of-the 1 group of test specimen, mm; h
2the center line average of-the 2 group of test specimen, mm.Finally, calculate the freeze thawing Ratio of split strength of compound according to formula (formula 3), test-results is as shown in table 6.
In (formula 3): RT
2-stand the tensile splitting strength of the 2nd group of test specimen of freeze-thaw cycle, MPa; RT
1-do not carry out the tensile splitting strength of the 1st group of test specimen of freeze-thaw cycle, MPa.
Table 6 freeze thawing Ratio of split strength test-results
| Embodiment sequence number | Freeze thawing Ratio of split strength (%) |
| Embodiment 1 | 99.2 |
| Embodiment 2 | 90.6 |
| Embodiment 3 | 88.3 |
| Embodiment 4 | 90.1 |
| Embodiment 5 | 83.5 |
| Embodiment 6 | 85.3 |
| Embodiment 7 | 76.5 |
| Embodiment 8 | 80.7 |
| Embodiment 9 | 81.8 |
Five, the mensuration of static pressure modulus
Test specimen adopts the right cylinder test specimen of hydrostatic profile, and diameter is 100mm ± 2.0mm, and height is 100 ± 2.0mm.Test temperature is 20 ℃, and loading rate is 2mm/min.According to resistance to compression load (P) result, get respectively seven grades of 0.1P, 0.2P, 0.3P, 0.4P, 0.5P, 0.6P and 0.7P as trial load, compound is exerted pressure step by step and unloaded, record P
iand corresponding distortion Δ L
i, and press formula 5. and 6. calculated static pressure modulus, test-results is as shown in table 7.
In (formula 4) and (formula 5): q
i-corresponding to load P at different levels
iunder pressure (MPa); P
i-put on the payload values at different levels (N) of test specimen; E-static pressure modulus (MPa); q
5-corresponding to the pressure (MPa) under the 5th grade of load (0.5P); H-test specimen axle center height (mm); Δ L
i-during corresponding to the 5th grade of load (0.5P) through the revised rebound deformation of initial point (mm).
Table 7 static pressure modulus test result
| Embodiment sequence number | Static pressure modulus (MPa) |
| Embodiment 1 | 2069 |
| Embodiment 2 | 1745 |
| Embodiment 3 | 1653 |
| Embodiment 4 | 1670 |
| Embodiment 5 | 1580 |
| Embodiment 6 | 1501 |
| Embodiment 7 | 1250 |
| Embodiment 8 | 1327 |
| Embodiment 9 | 1115 |
Above test-results shows, for road of the present invention, the pavement performance such as the Marshall stability of high-modulus cold-mix asphalt compound, flow valuve, isostatic pressing strength, dynamic stability, freeze thawing Ratio of split strength meets the requirement of highway engineering cold-mix asphalt mixture performance, and its more traditional road of static pressure modulus is improved approximately 1 times with cold-mix asphalt compound, can be at high temperature damp and hot and easily produce in the bituminous coat project that rut destroys and be applicable.
Claims (3)
- High-modulus cold-mix asphalt compound for 1.Yi Zhong road, it is characterized in that, this road with high-modulus cold-mix asphalt compound by following raw materials according by volume per-cent form: basalt aggregate: 71%～89.5%, limestone breeze: 1%～4.5%, SBS modified cation emulsified bitumen: 7%～10%; Ordinary Portland cement: 1%～3%; Chrome tanning leather sawdust: 1.5%～8.5%; Water: 0～3%; The volume percent sum of above-mentioned raw materials is 100%;Wherein, the particle size range of basalt aggregate is 0.075mm～13.2mm, the size distribution of chrome tanning leather sawdust is: the chrome tanning leather sawdust that particle diameter is (0.15～0.30) mm: 0.5%～3.0%, particle diameter is the chrome tanning leather sawdust of (0.075～0.15) mm: 0.5%～3.5%, and particle diameter is less than the chrome tanning leather sawdust of 0.075mm: 0.5%～2.0%.
- 2. high-modulus cold-mix asphalt compound for road as claimed in claim 1, it is characterized in that, described road with high-modulus cold-mix asphalt compound by following raw materials according by volume per-cent form: basalt aggregate: 77%～86%, limestone breeze: 1%～1.5%, SBS modified cation emulsified bitumen: 7%～9%; Ordinary Portland cement: 2%～3%; Particle diameter is the chrome tanning leather sawdust of (0.15～0.30) mm: 1.0%～2.5%, particle diameter is the chrome tanning leather sawdust of (0.075～0.15) mm: 1.0%～3.0%, particle diameter is less than the chrome tanning leather sawdust of 0.075mm: 1.0%～2.0%, water: 1.0%～2.0%, the volume percent sum of above-mentioned raw materials is 100%.
- 3. a preparation method for high-modulus cold-mix asphalt compound for road claimed in claim 1, is characterized in that, method comprises the following steps:The chrome tanning leather sawdust that is first 0.075mm～0.30mm by basalt aggregate and particle diameter mixes; Add again limestone breeze and particle diameter to be less than 0.075mm chrome tanning leather sawdust; Finally add SBS modified cation emulsified bitumen and water uniform mixing.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106587835A (en) * | 2016-12-14 | 2017-04-26 | 湖北益通建设股份有限公司 | Cold-mixed cement-emulsified asphalt concrete and pavement method thereof |
| CN106630769A (en) * | 2016-11-17 | 2017-05-10 | 中设设计集团股份有限公司 | Modified emulsified asphalt cold-mixed and cold-laid mixture for heavy traffic paving middle course and preparation method of modified emulsified asphalt cold-mixed and cold-laid mixture |
| CN108069661A (en) * | 2017-12-28 | 2018-05-25 | 喜跃发国际环保新材料股份有限公司 | A kind of aqueous cold repairing asphalt mixture and preparation method thereof |
| CN108358539A (en) * | 2018-01-22 | 2018-08-03 | 河南省交通规划设计研究院股份有限公司 | A kind of temperature resistance contracting compound and temperature resistance contracting Emulsified Asphalt Mixture |
| CN109133749A (en) * | 2018-09-29 | 2019-01-04 | 上海市政工程设计研究总院（集团）有限公司 | A kind of environmental flexible sawdust ground surface material |
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| CN101187193A (en) * | 2007-12-06 | 2008-05-28 | 武汉理工大学 | Half-flexible water drainage skid-free noise-reducing road surface pavement structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101187193A (en) * | 2007-12-06 | 2008-05-28 | 武汉理工大学 | Half-flexible water drainage skid-free noise-reducing road surface pavement structure |
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| CN106630769A (en) * | 2016-11-17 | 2017-05-10 | 中设设计集团股份有限公司 | Modified emulsified asphalt cold-mixed and cold-laid mixture for heavy traffic paving middle course and preparation method of modified emulsified asphalt cold-mixed and cold-laid mixture |
| CN106587835A (en) * | 2016-12-14 | 2017-04-26 | 湖北益通建设股份有限公司 | Cold-mixed cement-emulsified asphalt concrete and pavement method thereof |
| CN106587835B (en) * | 2016-12-14 | 2019-07-16 | 湖北益通建设股份有限公司 | A kind of cold mixing formula Cement emulsified asphalt concrete and its method for paving |
| CN108069661A (en) * | 2017-12-28 | 2018-05-25 | 喜跃发国际环保新材料股份有限公司 | A kind of aqueous cold repairing asphalt mixture and preparation method thereof |
| CN108358539A (en) * | 2018-01-22 | 2018-08-03 | 河南省交通规划设计研究院股份有限公司 | A kind of temperature resistance contracting compound and temperature resistance contracting Emulsified Asphalt Mixture |
| CN108358539B (en) * | 2018-01-22 | 2020-12-25 | 河南省交通规划设计研究院股份有限公司 | Temperature-shrinkage-resistant compound and temperature-shrinkage-resistant emulsified asphalt mixture |
| CN109133749A (en) * | 2018-09-29 | 2019-01-04 | 上海市政工程设计研究总院（集团）有限公司 | A kind of environmental flexible sawdust ground surface material |
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