阅读说明：本技术 抑烟型温拌改性剂、温拌浇注式沥青混合料及制备方法 (Smoke suppression type warm-mix modifier, warm-mix cast asphalt mixture and preparation method ) 是由 王滔 王民 尚飞 常城 彭祝涛 胡德勇 肖丽 汪昊 于 2020-07-17 设计创作，主要内容包括：本发明公开了抑烟型温拌改性剂、温拌浇注式沥青混合料及制备方法,温拌浇注式沥青混合料由矿料、沥青、抑烟型温拌改性剂以100:(7.0～8.0):(0.5～1.5)的质量比混合而成,所述沥青由A-70号道路石油沥青、低标号道路石油沥青以(60～80)：(20～40)的质量比混合而成,所述抑烟型温拌改性剂由苯乙烯类热塑性弹性体、降黏剂、高温补强剂和抑烟剂以(4～6):(2～5):(2～5):(0.3～5)的质量比混合而成。本发明制备的温拌浇注式沥青混合料拌和温度不高于200℃、沥青烟浓度不高于1.0mg/cm<Sup>3</Sup>,可减少能源消耗、降低沥青烟的排放,在减少环境污染的同时,可有效降低施工作业人员身体健康伤害,适合推广使用。(The invention discloses a smoke-inhibiting warm-mix modifier, a warm-mix cast asphalt mixture and a preparation method thereof, wherein the warm-mix cast asphalt mixture is prepared by mixing mineral aggregate, asphalt and the smoke-inhibiting warm-mix modifier in a mass ratio of 100 (7.0-8.0) to (0.5-1.5)The asphalt is prepared from A-70 road petroleum asphalt and low-grade road petroleum asphalt (60-80): (20-40), wherein the smoke-suppressing warm-mixing modifier is prepared by mixing (4-6) of styrene thermoplastic elastomer, (2-5) of viscosity reducer, (2-5) of high-temperature reinforcing agent and (0.3-5) of smoke suppressor. The warm-mix pouring type asphalt mixture prepared by the invention has the mixing temperature of not higher than 200 ℃ and the asphalt smoke concentration of not higher than 1.0mg/cm 3 The energy consumption can be reduced, the emission of asphalt smoke is reduced, the environmental pollution is reduced, the harm to the health of construction operators can be effectively reduced, and the method is suitable for popularization and use.)

1. The smoke suppression type warm mixing modifier is characterized in that: the adhesive is prepared from styrene thermoplastic elastomer, viscosity reducing agent, high-temperature reinforcing agent and smoke suppressant (4-6): (2-5): (2-5): (0.3-5) in mass ratio.

2. The smoke-suppressing warm mix modifier according to claim 1, characterized in that: the styrene thermoplastic elastomer is one or more of SBS, SIS and SEBS.

3. The smoke-suppressing warm mix modifier according to claim 1 or 2, characterized in that: the viscosity reducer is one of polyethylene wax and No. 95 microcrystalline paraffin.

4. The smoke-suppressing warm mix modifier of any preceding claim, wherein: the high-temperature reinforcing agent is one of 40-mesh waste tire rubber powder and 80-mesh waste tire rubber powder.

5. The smoke-suppressing warm mix modifier of any preceding claim, wherein: the smoke suppressant is nano CaCO₃、Mg(OH)₂、Al(OH)₃One kind of (1).

6. The warm-mix pouring type asphalt mixture adopts the smoke suppression type warm-mix modifier as claimed in any one of the preceding claims, and is characterized in that: the smoke-inhibiting type warm-mixing modifier is prepared by mixing mineral aggregate, composite asphalt and a smoke-inhibiting type warm-mixing modifier in a proportion of 100: (7.0-8.0): (0.5-1.5), wherein the composite asphalt is prepared by mixing A-70 road petroleum asphalt and low-grade road petroleum asphalt in a mass ratio of (60-80): (20-40) by mass ratio.

7. The warm-mix cast asphalt mixture according to claim 6, wherein: the penetration degree of the low-grade road petroleum asphalt is 10-40 (0.1 mm).

8. The preparation method of the warm-mix cast asphalt mixture is based on the warm-mix cast asphalt mixture of claim 6 or 7, and is characterized by comprising the following steps of:

step 1), mixing (4-6) of styrene thermoplastic elastomer, viscosity reducer, high-temperature reinforcing agent and smoke suppressant: (2-5): (2-5): (0.3-5), and then uniformly mixing the styrene thermoplastic elastomer, the viscosity reducer, the high-temperature reinforcing agent and the smoke suppressant to obtain the smoke suppression type warm mixing modifier;

step 2) heating the A-70 road petroleum asphalt and the low-grade road petroleum asphalt to 155-165 ℃, and then mixing the A-70 road petroleum asphalt and the low-grade road petroleum asphalt with the following ratio (60-80): (20-40) weighing and uniformly mixing to obtain composite asphalt;

step 3) heating the aggregate in the mineral aggregate to ensure that the temperature of the aggregate reaching a storage bin is 230-250 ℃;

step 4), mixing the mineral aggregate, the composite asphalt and the smoke suppression type warm mixing modifier according to the weight ratio of 100: (7.0-8.0): (0.5-1.5) weighing;

step 5) carrying out dry mixing on the mineral aggregate and the smoke suppression type warm mixing modifier in a mixing cylinder for 15-30 s, then adding the composite asphalt, and carrying out wet mixing for 70-90 s;

and 6) loading the wet-mixed mixture into a special transport vehicle for the cast asphalt mixture, and stirring at 185-200 ℃ for more than 90min to obtain the warm-mixed cast asphalt mixture.

Technical Field

The invention belongs to the technical field of materials, and particularly relates to a smoke-suppression warm-mix modifier, a warm-mix cast asphalt mixture and a preparation method thereof.

Background

After the twenty-first century, with the improvement of the attention degree of global environmental protection, energy conservation and emission reduction, the defects of the hot-mix asphalt mixture are gradually known. On the one hand, the hot-mixed asphalt mixture has high energy consumption and is not economical in the high-temperature mixing production process. On the other hand, a great deal of asphalt smoke (the concentration is often more than 2.0 mg/cm) is generated in the high-temperature paving and rolling processes³) Some components in the asphalt smoke can react with other components in the atmosphere photochemically, which causes environmental pollution. In addition, the asphalt smoke can enter the human body through the respiratory tract or the skin, so that the human body has symptoms of headache, palpitation, abdominal pain, chest distress, conjunctivitis, dermatitis and the like, and the adverse effect is brought to the physical health of field operators.

To solve the above-mentioned disadvantages, countries in the world, especially developed countries, are beginning to seek technical breakthroughs. In the beginning of the twenty-first century, the technology of warm-mixing the asphalt mixture appears, so that the construction temperature is effectively reduced, the generation of harmful gas is greatly reduced, the energy consumption in the production process is reduced, the aging of the asphalt is reduced, and the economy and the environmental protection of the asphalt mixture are realized on the premise of ensuring the excellent road performance and durability of the asphalt mixture. The definition of the warm-mix asphalt mixture is internationally acknowledged at present that the mixing temperature is 30-50 ℃ lower than that of the warm-mix asphalt mixture, the construction temperature is reduced by more than 30 ℃, and the warm-mix asphalt mixture has good construction workability and service performance.

Chinese patent CN105314930B discloses a warm mix asphalt mixture, and specifically discloses: the asphalt mixture is composed of stone, mineral powder, SBS modified asphalt, a warm mixing agent, styrene butadiene rubber, epoxy resin and an anti-rutting agent, and the mixture comprises the following raw materials in parts by weight: 76% of stone, 12% of mineral powder, 9% of SBS modified asphalt, 0.6% of warm mixing agent, 0.8% of styrene butadiene rubber, 1.1% of epoxy resin and 0.5% of anti-rutting agent; the warm mixing agent is inorganic aluminosilicate; the stone comprises 10-15 mm of broken stones, 5-10 m of broken stones, 3-5 mm of broken stones and 0-3 mm of broken stones; the proportion of the 10-15 mm of broken stone, the 5-10 mm of broken stone, the 3-5 mm of broken stone and the 0-3 mm of broken stone is 1: 1.5: 0.2: 0.1; the anti-rutting agent is polypropylene fiber. The warm-mixed asphalt mixture in the patent can reduce the construction temperature on one hand, simultaneously slows down aging, increases the anti-rutting function and the like, and compared with the mixture in the same row, the overall performance is improved by 10-20%.

However, the warm mix asphalt is used as a general modified asphalt. For the cast asphalt mixture, no warm-mixing modifier aiming at the cast asphalt mixture and a preparation method of the warm-mixing cast asphalt mixture exist at present.

The cast asphalt mixture is used as a road material with excellent performance, and has the advantages of good free deformation capability, excellent fatigue cracking resistance, good water tightness (the void ratio is close to 0 percent) and the like, so that the cast asphalt mixture is widely applied to high-grade asphalt pavements or special asphalt pavements at home and abroad, such as steel bridge pavement, tunnel pavement and the like. In addition, the material has the characteristics of high mixing temperature (220-250 ℃) and the like, and the high mixing temperature means high energy consumption in the production, transportation, heat preservation and stirring processes of the mixture; under the action of high temperature, light components in the asphalt volatilize, so that the low-temperature performance of the asphalt mixture is reduced, and simultaneously, a large amount of asphalt smoke is generated, thereby not only harming the body health of construction operators, but also generating certain pollution to the surrounding environment; the high mixing temperature also means that the quality control difficulty is high in the production process of the mixture, and the high temperature has great damage to equipment. Therefore, the industry needs to find a warm-mixing modifier for the cast asphalt and a preparation method of the warm-mixing cast asphalt mixture.

Disclosure of Invention

The invention aims to provide a smoke suppression type warm-mix modifier for a warm-mix cast asphalt mixture, the warm-mix cast asphalt mixture and a preparation method thereof. The warm-mixing pouring type asphalt mixture has the characteristics of low mixing temperature, low asphalt smoke concentration, low production cost, energy conservation, environmental protection and the like, and is suitable for popularization and application.

In order to achieve the purpose, the invention adopts the technical scheme that:

the first aspect of the invention provides a smoke suppression type warm mixing modifier:

the smoke suppression type warm mixing modifier is prepared from styrene thermoplastic elastomer, viscosity reducer, high-temperature reinforcing agent and smoke suppression agent (4-6): (2-5): (2-5): (0.3-5) in mass ratio. Wherein, the styrene thermoplastic elastomer is one or more of SBS, SIS and SEBS. The viscosity reducer is one of polyethylene wax and No. 95 microcrystalline paraffin. The high-temperature reinforcing agent is one of 40-mesh waste tire rubber powder and 80-mesh waste tire rubber powder. The smoke suppressant is nano CaCO₃、Mg(OH)₂、Al(OH)₃One kind of (1).

Secondly, the invention also provides a warm-mix pouring asphalt mixture which adopts the smoke-suppressing warm-mix modifier and is prepared by mixing mineral aggregate, composite asphalt and the smoke-suppressing warm-mix modifier by the weight ratio of 100: (7.0-8.0): (0.5-1.5) by mass ratio. Wherein the composite asphalt is prepared from A-70 road petroleum asphalt and low-grade road petroleum asphalt (60-80): (20-40) by mass ratio. And the penetration degree of the low-grade road petroleum asphalt is 10-40 (0.1 mm).

The invention also provides a preparation method based on the warm-mix pouring type asphalt mixture, which comprises the following steps:

step 1), mixing the styrene thermoplastic elastomer, the viscosity reducer, the high-temperature reinforcing agent and the smoke suppressant in a ratio of (4-6): (2-5): (2-5): (0.3-5), and then uniformly mixing the styrene thermoplastic elastomer, the viscosity reducer, the high-temperature reinforcing agent and the smoke suppressant to obtain the smoke suppression type warm mixing modifier;

step 2) heating the A-70 road petroleum asphalt and the low-grade road petroleum asphalt to 155-165 ℃, and then mixing the A-70 road petroleum asphalt and the low-grade road petroleum asphalt with the following ratio (60-80): (20-40) weighing and uniformly mixing to obtain composite asphalt;

step 3) heating the aggregate in the mineral aggregate to ensure that the temperature of the aggregate reaching a storage bin is 230-250 ℃;

step 4), mixing the mineral aggregate, the composite asphalt and the smoke suppression type warm mixing modifier according to the weight ratio of 100: (7.0-8.0): (0.5-1.5) weighing;

step 5) carrying out dry mixing on the mineral aggregate and the smoke suppression type warm mixing modifier in a mixing cylinder for 15-30 s, then adding the composite asphalt, and carrying out wet mixing for 70-90 s;

and 6) loading the wet-mixed mixture into a special transport vehicle for the cast asphalt mixture, and stirring at 185-200 ℃ for more than 90min to obtain the warm-mixed cast asphalt mixture.

Compared with the prior art, the invention has the beneficial effects that:

1) the method is used for producing the cast asphalt mixture based on a warm mixing modification mechanism, and the mixing temperature is 185-200 ℃, which is 35-65 ℃ lower than that of the traditional cast asphalt mixture. The fuel oil consumption in the traditional pouring type asphalt mixture mixing production process is about 16-20 kg/t, the fuel oil consumption in the warm-mixing pouring type asphalt mixture mixing production process is about 12-15 kg/t, the fuel oil consumption is reduced by more than 25%, the production cost can be effectively reduced, and the CO is reduced₂And the effects of energy conservation and environmental protection are achieved.

2) In the production process of the traditional cast asphalt mixture, the aggregate heating temperature is often up to more than 300 ℃, and under the high-temperature production condition, the difficulty in controlling the quality of the mixture is high, and the damage to equipment is large. The warm-mix cast asphalt mixture has the production temperature which is 35-65 ℃ lower than that of the traditional cast asphalt mixture, and can effectively improve the stability of the production quality of the mixture, reduce the damage of equipment and reduce the maintenance cost.

3) The warm-mix pouring type asphalt mixture is produced based on the asphalt smoke inhibition technology, and the concentration of asphalt smoke is not higher than 1.0mg/cm³And the asphalt smoke concentration of the asphalt mixture is lower than that of the traditional cast asphalt mixture by more than 50 percent. On one hand, the discharge amount of harmful substances such as greenhouse gas, inhalable particles and the like is reduced, and the environmental pollution is reduced; on the other hand, the damage of asphalt smoke to the health of construction operators is effectively reduced.

Detailed Description

In order to better understand the present invention, the following examples are further provided to illustrate the content of the present invention, but the present invention is not limited to the following examples.