CN1311015C - Asphalt modifier in use for aggregate modification of acidity of bituminous concrete and preparation method - Google Patents
Asphalt modifier in use for aggregate modification of acidity of bituminous concrete and preparation method Download PDFInfo
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- CN1311015C CN1311015C CNB2003101111785A CN200310111178A CN1311015C CN 1311015 C CN1311015 C CN 1311015C CN B2003101111785 A CNB2003101111785 A CN B2003101111785A CN 200310111178 A CN200310111178 A CN 200310111178A CN 1311015 C CN1311015 C CN 1311015C
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- asphalt modifier
- asphalt
- sio
- diatomite
- acidity
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Abstract
The present invention provides an asphalt modifier for modifying acidic aggregate asphalt concrete and a preparation method thereof. The present invention is characterized in that the asphalt modifier contains the components by weight: 10 to 40% of SiO2 and less than 5% of water, the bulk density is less than 0.8 g/cm<3>, and the base number is more than 0.9. The asphalt modifier has capability of adhering to asphalt at 4 to 5 grade and can not be decomposed or volatilized within 380 DEG C, and the asphalt modifier has the granularity (400 mesh) with less than 25% of the sieve residue. The asphalt modifier can make the adhesive of the acidic aggregate asphalt concrete reach 4 to 5 grade and has the advantages of stable performance, no volatilization at high temperature, no decomposition and high durability. The asphalt modifier can also obviously improve the quality of the road surface and prolong the service life of the road surface, and consequently, the maintenance and repair cost of the road surface is reduced, and the present invention has excellent social benefits.
Description
Technical field
The present invention relates to a kind of asphalt modifier, especially a kind of asphalt modifier that is used for the modification of asphalt concrete acidity aggregate and preparation method thereof.
Background technology
Existing high-grade highway, having more than 75% is asphalt concrete pavement.Gathering materials that this road surface is used has alkalescence to gather materials and acidity aggregate.For alkalescence such as Wingdale, rhombspar were gathered materials, its advantage was: better with the bituminous adhesivity, but ultimate compression strength is lower, and rate of wear is higher, and weather resistance is relatively poor.And acidity aggregates such as grouan, basalt, andesite, diabase, leaf gneiss, their ultimate compression strength height, rate of wear is low, is that the high-quality of high-grade highway is gathered materials.But because the SiO that this class is gathered materials
2The content height, and be acid, bad with asphalt adhesion, even raw material just also can't utilize in the locality.In order to solve the adhesivity of pitch and acidity aggregate, the Chemicals that multiple name is called " antistripping agent " have been developed both at home and abroad.But this product effect in actual applications is unsatisfactory, and reason is that high-temperature stability is bad, is easy to decompose, and weather resistance is relatively poor.Therefore, be necessary prior art is improved.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of asphalt modifier that can carry out modification to the asphalt concrete acidity aggregate is provided, to overcome the deficiency of chemical antistripping agent, acidity aggregate is used for high-grade highway to be done to gather materials, make itself and bituminous adhesivity reach 4～5 grades, and high-temperature stability and good endurance.
Another object of the present invention is to provide a kind of technology simple, cost is low, the preparation method of the effective asphalt modifier that is used for the modification of asphalt concrete acidity aggregate.
The present invention realizes (the used per-cent of the present invention all is weight percentage) by following technical proposal:
The SiO of described asphalt concrete acidity aggregate asphalt modifier
2Content is 10-40%, water content＜5%, bulk density＜0.8g/cm
3, base number＞0.9, with the bituminous adhesivity be the 4-5 level, do not decompose in 380 ℃, non-volatile, granularity (400 order) tails over＜25%.
The described preparation method who is used for the asphalt modifier of asphalt concrete acidity aggregate modification is:
A, will contain amorphousness SiO
2And the diatomite with microvoid structure is under 600～800 ℃ of temperature, roasting 7-12 hour, and make it finish purification, modification, activation, dilatation, be crushed to the 200-600 order after the cooling, stand-by;
B, take off the material of column weight amount per-cent:
Baked diatomite 20%～30%
Metakaolinite 5～10%,
Mullite 2～5%,
Ca(OH)
2 55～65％
Through stirring and evenly mixing, slaking, grinding, selection by winnowing, make the acidity aggregate asphalt modifier of 400 mesh screen residues＜25%.
Used diatomite is high loss on ignition type diatomite among the preparation technology of the present invention, and its Chemical Composition is: SiO
255～60%, Al
2O
312～16%, Fe
2O
36～10%, CaO 1～2%, and MgO 1～1.5%, K
2O 1～2%, Na
2O 0.2～0.5%, loss on ignition 20～26%.
Diatomaceous roasting apparatus adopts " arranging all-in-one oven " of the prior art more among the preparation technology of the present invention, blocky diatomite is put into " arranging all-in-one oven " more, make its spontaneous combustion, temperature is controlled at 600～800 ℃, time 7-12 hour, be crushed to 200 orders after the cooling.
The used metakaolinite of the present invention, mullite, Ca (OH)
2All be Industrial products.Metakaolinite SiO
245 ± 3%, Al
2O
337 ± 2%.Mullite Al
2O
365 ± 2%, SiO
230 ± 2%.Ca(OH)
2 CaO+MgO＝72±1％。
The present invention has following modified effect to the asphalt concrete acidity aggregate;
1, acidity aggregate, as grouan, granite gneiss, basalt, diabase, andesite etc., with the bituminous adhesivity by 1～2 grade, bring up to 4～5 grades, and high-temperature stability and good endurance, see Table 1.
2, with the asphalt modifier of the present invention's preparation, join in the pitch, penetration degree descends, and softening temperature improves, and 135 ℃ of viscosity improve, and show that high-temperature stability improves, and sees Table 2.
3, with the acidity aggregate asphalt of the present invention's preparation, density increases, and porosity reduces, and the pitch saturation ratio improves, and Marshall stability, residual stability, Marshall modulus increase substantially, and illustrate that mixture performance is good, see Table 3.
4, the acidic mixed material for preparing with the present invention, making on motorway, the acid modification asphalt concrete pavement is checked and accepted evenness of road surface, closely knit through close inspection, gather materials bonding firmly, high temperature is bellding not, and low temperature does not ftracture, and water stability is fabulous, wear-resisting, antiskid, reduce noise, improve more than 70% fatigue lifetime.
In a word, asphalt modifier with the present invention's preparation, can make the adhesivity of acidity aggregate asphalt concrete reach 4～5 grades, and stable performance, high temperature is non-volatile, do not decompose, good endurance can significantly improve pavement quality, prolongs service life of road surface, thereby reduce maintenance of surface, maintenance cost, have fabulous social benefit.
Description of drawings
Fig. 1 is the present invention's process flow sheet.
Embodiment
Below by specific embodiment the present invention is described further.
Embodiment:
The major equipment of actual usefulness has: arrange all-in-one oven, hammer mill, the ultra-fine autogenous mill of hurricane, slaking storehouse, proportioning machine, stirrer, wrapping machine more.
Raw materials used have 4 kinds: 1, diatomite; 2, metakaolinite; 3, mullite; 4, Ca (OH)
2
1, diatomite by " arranging all-in-one oven " purification, modification, activation and dilatation more.Its concrete practice is: block diatomite is broken into sheet about thick 20cm, in pack into " arranging all-in-one oven ", come out of the stove after drying, spontaneous combustion, insulation, the cooling more, whole process needs 9 hours, wherein dried 2 hours, spontaneous combustion 3 hours is incubated 2 hours, cooled off 2 hours, 600～800 ℃ of spontaneous ignition temperatures, diatomite is beige more after " arranging all-in-one oven " roasting, various Chemical Composition see Table 4, and it is ground into powdery through hammer mill;
2, press 25% with the diatomite after roasting, the pulverizing, allocate metakaolinite 8% into, mullite 2%, Ca (OH)
265%, go into proportioning machine, prepare material after, go into stirrer, after stirring, go into the slaking storehouse, and then it is levigate to enter the ultra-fine autogenous mill of hurricane, through selection by winnowing, just make 400 mesh screen residues less than 25% acidity aggregate asphalt modifier;
3, with 200 tons of this asphalt modifiers, press bitumen aggregate ratio 5.1%, fry and mix 19607 tons of acidity aggregate asphalts,, check and accept, be chosen as excellent engineering through close inspection 8.8 kilometers of motorway shop, two-way 4 track AK-16A bituminous concrete pavements.This two winters of two summers of road surface test does not have any early damage vestige, has successfully solved the bad problem of acidity aggregate and asphalt adhesion.Thereby for acidity aggregate large-scale popularization in the Expressway Asphalt concrete is used, is gathered materials on the spot and created condition.
Table 1 adhesiveness test
| The kind of gathering materials | The grade of gathering materials (cm) | Aggregate temperature (℃) | Asphalt temperature (℃) | Gather materials time (S) in pitch | Gather materials the aerial time (min) | The poach time (min) | Pitch peels off degree (%) | The adhesivity grade |
| Granite gneiss | 10.5 | 105 | 150 | 45 | 15 | 3 | 0 | 5 |
Table 2 pitch " three big indexs " test
| The pitch kind | The heated bitumen temperature (℃) | Consumption (compound, %) | Penetration degree (0.1mm) | Ductility (cm) | Softening temperature (℃) | Viscosity (135 ℃, PaS) | Adhesivity | |
| Be added in the pitch | Be added in the compound | |||||||
| AH-70 | 150 150 155 165 175 | 0 0.5 1.0 1.5 2.0 | 71.8 65.7 45.6 41.8 38.6 | 195.0 109.4 55.6 50.4 44.8 | 47.6 49.3 49.5 50 51 | 0.436 0.586 0.778 1.24 1.68 | 2 grades 2 grades 3 grades 4 grades 4 grades | 2 grades 3 grades 5 grades 5 grades 5 grades |
The Marshall stability test of table 3 acidity aggregate
| The properties-correcting agent consumption | Mix type | Bitumen aggregate ratio (%) | Density (g/cm 3) | Voidage (%) | Saturation ratio (%) | Stability (KN) | Flow valuve (0.1mm) | Residual stability (%) | The Marshall modulus |
| Compound 0% | AK-16A | 5.1 | 2.316 | 6.1 | 60.18 | 8.92 | 33.1 | 89.5 | 2.84 |
| Compound 1.0% | 5.1 | 2.348 | 5.8 | 62.6 | 9.33 | 31.7 | 92.4 | 2.94 | |
| Compound 1.5% | 5.1 | 2.321 | 4.3 | 70.5 | 9.88 | 32.3 | 98.1 | 3.06 | |
| Code requirement | 4～10 | 60～75 | ＞50 | 20～40 | ＞70 |
Diatomaceous chemical ingredients after table 4 roasting
| Component | SiO 2 | Al 2O 3 | Fe 2O 3 | CaO | MgO | K 2O | Na 2O | Loss on ignition | Add up to |
| Content (%) | 68.01 | 16.58 | 10.36 | 0.71 | 1.09 | 1.56 | 0.11 | 1.58 | 100 |
Claims (3)
1, a kind of asphalt modifier that is used for the modification of asphalt concrete acidity aggregate is characterized in that it contains the SiO that weight percent is 10-40%
2, moisture content＜5%, its bulk density＜0.8g/cm
3, base number＞0.9, with the bituminous adhesivity be the 4-5 level, do not decompose in 380 ℃, non-volatile, granularity is 400 mesh screen residues＜25%; And make by following method:
A, will contain amorphousness SiO
2And the diatomite with microvoid structure is under 600～800 ℃ of temperature, roasting 7-12 hour, and make it finish purification, modification, activation, dilatation, be crushed to the 200--600 order after the cooling, stand-by;
B, take off the material of column weight amount per-cent:
Baked diatomite 20%～30%
Metakaolinite 5～10%,
Mullite 2～5%,
Ca(OH)
2 55～65％
Through stirring and evenly mixing, slaking, grinding, selection by winnowing, make the acidity aggregate asphalt modifier of 400 mesh screen residues＜25%.
2, asphalt modifier according to claim 1 is characterized in that described diatomite is high loss on ignition type diatomite, and its Chemical Composition is following mass percent: SiO
255～60%, Al
2O
312～16%, Fe
2O
36～10%, CaO 1～2%, and MgO 1～1.5%, K
2O 1～2%, Na
2O0.2～0.5%, loss on ignition 20～26%.
3, asphalt modifier according to claim 1 is characterized in that used metakaolinite, mullite, Ca (OH)
2All be Industrial products, the chemical ingredients of metakaolinite is following mass percent: SiO
245 ± 3%, Al
2O
337 ± 2%; The chemical ingredients of mullite is following mass percent: Al
2O
365 ± 2%, SiO
230 ± 2%; Ca (OH)
2Chemical ingredients be following mass percent: CaO+MgO=72 ± 1%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101111785A CN1311015C (en) | 2003-12-08 | 2003-12-08 | Asphalt modifier in use for aggregate modification of acidity of bituminous concrete and preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101111785A CN1311015C (en) | 2003-12-08 | 2003-12-08 | Asphalt modifier in use for aggregate modification of acidity of bituminous concrete and preparation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1626568A CN1626568A (en) | 2005-06-15 |
| CN1311015C true CN1311015C (en) | 2007-04-18 |
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ID=34759348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101111785A Expired - Fee Related CN1311015C (en) | 2003-12-08 | 2003-12-08 | Asphalt modifier in use for aggregate modification of acidity of bituminous concrete and preparation method |
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|---|---|
| CN (1) | CN1311015C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2462489C2 (en) * | 2010-11-16 | 2012-09-27 | Федеральное государственное образовательное учреждение высшего профессионального образования "Казанский государственный архитектурно-строительный университет" (КазГАСУ) | Nanomodified asphalt-rubber composition and production method thereof |
| CN115304927A (en) * | 2022-09-20 | 2022-11-08 | 大理大学 | Preparation method of asphalt modifier for modifying asphalt concrete acidic aggregate |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1339524A (en) * | 2000-08-18 | 2002-03-13 | 于漧 | Modifier for silicon modified asphalt and its preparing method |
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2003
- 2003-12-08 CN CNB2003101111785A patent/CN1311015C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1339524A (en) * | 2000-08-18 | 2002-03-13 | 于漧 | Modifier for silicon modified asphalt and its preparing method |
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| Publication number | Publication date |
|---|---|
| CN1626568A (en) | 2005-06-15 |
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Granted publication date: 20070418 Termination date: 20131208 |