CN102745930B - Modifier of asphalt concrete and preparation method thereof - Google Patents
Modifier of asphalt concrete and preparation method thereof Download PDFInfo
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- CN102745930B CN102745930B CN201210278470.5A CN201210278470A CN102745930B CN 102745930 B CN102745930 B CN 102745930B CN 201210278470 A CN201210278470 A CN 201210278470A CN 102745930 B CN102745930 B CN 102745930B
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Abstract
The invention relates to a modifier of an asphalt concrete and a preparation method thereof. The modifier of the asphalt concrete is mainly made of a natural crystalloid hydration magnesium aluminum silicate mineral richly reserved in the northwest and can be obtained through a series of physical and chemical activation processes of the mineral. The modifier of the asphalt concrete is in a fiber chain structure and in alkalescence microscopically, forming of even and stable asphalt binders on the surfaces of mineral aggregates is facilitated, and the modifier has an obvious improving effect for the stability of the asphalt concrete, so that the high-temperature stability, low-temperature stability and water stability of the asphalt concrete can be improved comprehensively, and the service life of asphalt concrete pavements is prolonged. The modifier is simple in preparation process and low in cost, and social and economical benefits are remarkable.
Description
Technical field
The present invention relates to a kind of asphalt concrete modifying agent and preparation method thereof, be particularly related to a kind of asphalt concrete modifying agent that can improve bituminous concrete high-temperature stability, low-temperature stability and water stability.
Background technology
In recent years, bituminous highway career development is very fast, but the problem of bituminous pavement ubiquity technology and two aspects of quality, be mainly reflected in the weather resistance of highway engineering and the early stage infringement on road surface, especially severe at some weather condition and the larger section of traffic loading, therefore, the performance of bituminous concrete is had higher requirement.Conventionally, bituminous concrete the pitch through heating and the uniform mixture that thick, fine aggregate and packing material (breeze, cement etc.) form by suitable proportioning institute mix are obtained after compacting, therefore to the improvement of material, be, the most basic measure that improves bituminous concrete performance.
Conventionally, the temperature stability of bituminous concrete is the principal element that affects highway weather resistance, the water stability of bituminous concrete is the principal element that affects Protective Measures of Bitumen Pavement Initial Damage, bituminous concrete pavement is because stability is bad, just there is a large amount of be full of cracks, hole groove, the obscission of peeling off, gather materials not reaching its design life, even form structural destruction, have to rebuilding or maintenance, cause the great wasting of resources and financial loss.Therefore, from material system, optimize the proportioning of bituminous concrete and the properties-correcting agent that employing improves bituminous concrete performance, can improve physisorption and the chemisorption of asphaltic binder, the more structure pitch that produces, reduce free pitch, improve pitch and the interactional cohesion of aggregate, thereby improve the performances such as high-temperature stability, low-temperature stability and water stability of bituminous concrete.
At present, utilize flyash as the filler of bituminous concrete, the preferential wax component in adsorptive pitch, thereby improve the quality of pitch, the high temperature of road improvement bituminous concrete and low-temperature performance, but regulation in < < standard specification for construction and acceptance of highway asphalt pavement > > (JTG F40-2004): flyash consumption must not surpass 50% of filler total amount, the loss on ignition of flyash should be less than 12%, should be less than 4% with the mixed plasticity index of breeze; The oil mat of motorway and Class I highway should not adopt flyash to do filler.Utilizing cement to replace part breeze to use in bituminous concrete is commonplace in the world method, more extensive in US and European application especially, the specific of it is the water stability that has improved asphalt concrete pavement, cost is than using the modifying asphalts such as SBS or using antistripping agent low, in current Chinese code of practice, also mention the water stability that improves bituminous concrete with the breeze of cement replacement 2%, but can make asphalt hardening after admixture cement, it is large that fragility becomes, and the low-temperature stability of bituminous concrete is had to disadvantageous effect to a certain degree.Kunming, Yunnan proposes the siliceous asphalt modifier of application diatomite development, and the thermal conductivity of pitch is declined, and heat absorption value reduces, thermal resistance, cold resistance value improve, Temperature Susceptibility reduces, and the high low-temperature stability of bituminous concrete improves, but the water stability of bituminous concrete is not obtained to research effect.Therefore, find a kind of material system, can improve temperature stability and the water stability of bituminous concrete comprehensively, improve weather resistance and the early stage infringement of bituminous pavement, extend the work-ing life of bituminous highway, have great importance.
Summary of the invention
The present invention proposes for solving the defect of above-mentioned prior art, its objective is comprehensive raising bituminous concrete high-temperature stability, low-temperature stability and water stability, thereby extends the work-ing life of bituminous concrete pavement.
For achieving the above object, the present invention proposes a kind of asphalt concrete modifying agent and preparation method thereof, it is characterized in that main raw material(s) is a kind of natural crystalloid hydrous magnesium aluminium silicate mineral, through series of physical and chemical activation processing, prepare a kind of weakly alkaline powdery substance that is.
First pass through ultrasonic wave physical purification, remove thicker impurity;
Then in the NaCl solution that is 10% in concentration, carry out salt activation treatment, 75 ℃ of heating in water bath, soak repetitive scrubbing after 7 hours and are filtered to without chlorion, then 80 ℃ of oven dry;
With organic cation tensio-active agent, according to the ratio of cation exchange capacity, sample is carried out to organically-modified processing again; Finally by sample according to the ratio of solid-to-liquid ratio 1:50 at the Ca of 1mmol/L (OH)
2in solution, carry out alkali activation treatment, 75 ℃ of heating in water bath, soak repetitive scrubbing after 3 hours and are filtered to weakly alkaline, then 80 ℃ of oven dry.
The main chemical compositions of described crystalloid hydrous magnesium aluminium silicate mineral is SiO
2, Al
2o
3, Fe
2o
3, MgO and CaO.Association has a small amount of quartz, feldspar, rhombspar and calcite.
Described organic cation tensio-active agent is cetyl trimethylammonium bromide (HDTMAB), and the positively charged ion valency amount of changing is about 50mmol/100g.
Concrete preparation method is as follows:
The preparation of asphalt concrete modifying agent: starting material are a kind of natural crystalloid hydrous magnesium aluminium silicate mineral, prepares a kind of weakly alkaline powdery substance that is through series of physical and chemical activation processing.Preparation method is as follows:
A. pass through ultrasonic wave physical purification, remove thicker impurity;
B. in the NaCl solution that is 10% in concentration, carry out salt activation treatment, 75 ℃ of heating in water bath, soak repetitive scrubbing after 7 hours and are filtered to without chlorion, then 80 ℃ of oven dry;
C. the ratio of using organic cation tensio-active agent cetyl trimethylammonium bromide (HDTMAB) to be about 50mmol/100g according to cation exchange capacity is carried out organically-modified processing to sample;
D. by sample according to the ratio of solid-to-liquid ratio 1:50 at the Ca of 1mmol/L (OH)
2in solution, carry out alkali activation treatment, 75 ℃ of heating in water bath, soak repetitive scrubbing after 3 hours and are filtered to weakly alkaline, then 80 ℃ of oven dry.
2. the preparation of bituminous concrete: requiring selection and designing mixture ratio of asphalt concrete shaping test piece according to < < standard specification for construction and acceptance of highway asphalt pavement > > (JTG F40-2004).
A. pitch: the AH-90 bi tumenf orr oad (A level) that adopts Gansu Samsung petrochemical iy produced;
B. gather materials: adopt ground, Lanzhou City, Gansu Province material, performance meets the requirement of < < standard specification for construction and acceptance of highway asphalt pavement > > (JTG F40-2004);
C. breeze: the limestone dust that adopts Lanzhou mineral powder plant to produce;
D. the preparation of asphalt: adopt the full-automatic compound amalgamator of BH-10 type to stir, mix temperature is 150 ℃, and mineral aggregate Heating temperature is 165 ℃.
Embodiment
1. the preparation of asphalt concrete modifying agent: starting material are a kind of natural crystalloid hydrous magnesium aluminium silicate mineral, prepares a kind of weakly alkaline powdery substance that is through series of physical and chemical activation processing.
A. pass through ultrasonic wave physical purification, remove thicker impurity;
B. in the NaCl solution that is 10% in concentration, carry out salt activation treatment, 75 ℃ of heating in water bath, soak repetitive scrubbing after 7 hours and are filtered to without chlorion, then 80 ℃ of oven dry;
C. the ratio of using organic cation tensio-active agent cetyl trimethylammonium bromide (HDTMAB) to be about 50mmol/100g according to cation exchange capacity is carried out organically-modified processing to sample;
D. by sample according to the ratio of solid-to-liquid ratio 1:50 at the Ca of 1mmol/L (OH)
2in solution, carry out alkali activation treatment, 75 ℃ of heating in water bath, soak repetitive scrubbing after 3 hours and are filtered to weakly alkaline, then 80 ℃ of oven dry.
2. the preparation of bituminous concrete: requiring selection and designing mixture ratio of asphalt concrete shaping test piece according to < < standard specification for construction and acceptance of highway asphalt pavement > > (JTG F40-2004).
A. pitch: the AH-90 bi tumenf orr oad (A level) that adopts Gansu Samsung petrochemical iy produced;
B. gather materials: adopt ground, Lanzhou City, Gansu Province material, performance meets the requirement of < < standard specification for construction and acceptance of highway asphalt pavement > > (JTG F40-2004);
C. breeze: the limestone dust that adopts Lanzhou mineral powder plant to produce;
D. the preparation of asphalt: adopt the full-automatic compound amalgamator of BH-10 type to stir, mix temperature is 150 ℃, and mineral aggregate Heating temperature is 165 ℃.
3. performance test evaluation: mix beading formula AC-13 I type bituminous concrete, asphalt content be 4.5%, the I group for not adding asphalt concrete modifying agent, II group adds 6% asphalt concrete modifying agent, measure Marshall stability, low temperature splitting parameter and water stability, comparing result is as follows:
A. Marshall stability test:
B. low temperature cracking test:
C. water stability testing:
In June, 2010 in Gansu Province west long phoenix (crossing, Fengxiang, Xifeng---Chang Qingqiao---) motorway (K0+000～K35+600) making 2.0 kilometers of test sections, asphalt concrete modifying agent volume is 6%, so far respond well, during examination, be chosen as excellent engineering.
Claims (1)
1. an asphalt concrete modifying agent, is characterized in that: by starting material, be natural crystalloid hydrous magnesium aluminium silicate mineral, through physics and chemical activation processing, prepare a kind of weakly alkaline powdery substance properties-correcting agent that is, main chemical compositions is SiO
2, Al
2o
3, Fe
2o
3, MgO and CaO, association has a small amount of quartz, feldspar, rhombspar and calcite, its preparation method is as follows:
A. pass through ultrasonic wave physical purification, remove thicker impurity;
B. in the NaCl solution that is 10% in concentration, carry out salt activation treatment, 75 ℃ of heating in water bath, soak repetitive scrubbing after 7 hours and are filtered to without chlorion, then 80 ℃ of oven dry;
C. the ratio of using organic cation tensio-active agent cetyl trimethylammonium bromide (HDTMAB) to be about 50mmol/100g according to cation exchange capacity is carried out organically-modified processing to sample;
D. by sample according to the ratio of solid-to-liquid ratio 1:50 at the Ca of 1mmol/L (OH)
2in solution, carry out alkali activation treatment, 75 ℃ of heating in water bath, soak repetitive scrubbing after 3 hours and are filtered to weakly alkaline, then 80 ℃ of oven dry.
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| CN201210278470.5A CN102745930B (en) | 2012-08-07 | 2012-08-07 | Modifier of asphalt concrete and preparation method thereof |
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| CN201210278470.5A CN102745930B (en) | 2012-08-07 | 2012-08-07 | Modifier of asphalt concrete and preparation method thereof |
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| CN102745930A CN102745930A (en) | 2012-10-24 |
| CN102745930B true CN102745930B (en) | 2014-03-05 |
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| CN103773041B (en) * | 2014-02-19 | 2016-01-20 | 长安大学 | A kind of road asphalt modifier and preparation method thereof |
| CN104926194B (en) * | 2015-06-05 | 2017-03-01 | 华南理工大学 | A kind of water solublity gathers materials the antirust modifying agent of asphalt interface and preparation method and application |
| CN107954635A (en) * | 2018-01-04 | 2018-04-24 | 山东科达基建有限公司 | Asphalt concrete modifying agent |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001240444A (en) * | 2000-02-29 | 2001-09-04 | Ohbayashi Corp | Impervious paving material and paving method |
| CN101264894A (en) * | 2007-11-16 | 2008-09-17 | 兰州理工大学 | Method for preparing secondary intercalation organic bentonite |
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2012
- 2012-08-07 CN CN201210278470.5A patent/CN102745930B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001240444A (en) * | 2000-02-29 | 2001-09-04 | Ohbayashi Corp | Impervious paving material and paving method |
| CN101264894A (en) * | 2007-11-16 | 2008-09-17 | 兰州理工大学 | Method for preparing secondary intercalation organic bentonite |
Non-Patent Citations (2)
| Title |
|---|
| 朱宝华.纳米层状硅酸盐改性沥青制备工艺与机理研究.《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》.2008, |
| 纳米层状硅酸盐改性沥青制备工艺与机理研究;朱宝华;《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》;20081031;第1-3，33-36,40，43-44，59页及表1.1 * |
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Address after: 730020 1188 Jiatan Road, Chengguan District, Lanzhou City, Gansu Province Patentee after: Gansu Academy of Civil Engineering Sciences Co., Ltd. Address before: 730020 1188 Jiatan Road, Chengguan District, Lanzhou City, Gansu Province Patentee before: Gansu Civil Engineering Research Institute |
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