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An additive for improving the performance of asphalt pavement and its preparation method

A kind of asphalt pavement and additive technology, applied in the field of additives to improve the performance of asphalt pavement, can solve the problems of unfavorable environment and personal health, strong pungent smell, inhalation of staff, etc., to achieve environmental protection and personal health, less volatile gas , The effect of improving low temperature cracking resistance

Active Publication Date: 2016-03-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two patents also need to heat and melt sulfur into a liquid state. The operating temperature is high, which will produce a strong pungent smell, which is not conducive to the environment and human health.
It can only improve the high-temperature performance of the asphalt mixture. The low-temperature cracking resistance and water damage resistance of the mixture still need to be improved, and the sulfur particles formed are also relatively brittle and easily broken during transportation and loading and unloading. Due to the friction between the particles, It will also produce more dust, which not only pollutes the environment, but also easily inhales the staff, endangering health.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 70 kg of sulfur, 10 kg of EVA (vinyl acetate content of 68%, softening point of 105°C), 15 kg of PSBR (22% by mass of styrene) and 5 kg of aluminum hydroxide, and mix them evenly with mixing equipment , and then convey the mixture to an extruder for extrusion and granulation to form granules with a diameter of 3 mm and a length of 3 to 8 mm to obtain the additive of the present invention. The temperature at the feed port of the extruder is 70°C, the temperature at the discharge port is 130°C, and the intermediate temperature control point is between 70°C and 130°C. The extruder is a single screw extruder. The ratio of raw materials and the properties of additives are shown in Table 1.

[0036] Pre-heat the special asphalt mixing tank to a constant temperature of 130°C; pre-preparate Fushun basalt rock into a graded AC-13 stone with a total weight of 100kg, and heat it to 130°C for use; pre-weigh No. 70 bitumen (Donghai brand) 5.22kg, heated to 150°C for later us...

Embodiment 2

[0038]Weigh 90 kg of sulfur, 4 kg of EVA (the content of vinyl acetate is 43%, and the softening point is 83°C), 5 kg of PSBR (the mass percentage of styrene is 34%), and 1 kg of magnesium hydroxide, and mix them evenly with mixing equipment , and then convey the mixture to an extruder for extrusion and granulation to form granules with a diameter of 3 mm and a length of 3 to 8 mm to obtain the additive of the present invention. The temperature at the feed port of the extruder is 90°C, the temperature at the discharge port is 110°C, and the intermediate temperature control point is between 90°C and 110°C. The extruder is a twin-screw extruder. The ratio of raw materials and the properties of additives are shown in Table 1.

[0039] Pre-heat the special asphalt mixing tank to a constant temperature of 160°C; pre-preparate Fushun basalt rock into a graded AC-13 stone with a total weight of 100kg, and heat it to 160°C for use; pre-weigh No. 70 bitumen (Donghai brand) 4.06kg, he...

Embodiment 3

[0041] Weigh 80 kg of sulfur, 7 kg of EVA (the content of vinyl acetate is 55%, and the softening point is 96°C), 10 kg of PSBR (the mass percentage of styrene is 28%), and 3 kg of calcium hydroxide, and mix them evenly with mixing equipment , and then convey the mixture to an extruder for extrusion and granulation to form granules with a diameter of 3 mm and a length of 3 to 8 mm to obtain the additive of the present invention. The temperature at the feed port of the extruder is 80°C, the temperature at the discharge port is 120°C, and the intermediate temperature control point is between 80°C and 120°C. The extruder is a single screw extruder. The ratio of raw materials and the properties of additives are shown in Table 1.

[0042] Pre-heat the special asphalt mixing tank to a constant temperature of 145°C; pre-preparate Fushun basalt rock into AC-13 stone with a total weight of 100kg, and heat it to 145°C for use; pre-weigh No. 70 asphalt (Donghai brand) 4.64kg, heated to...

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Abstract

The invention discloses an additive for improving the performance of asphalt pavement and a preparation method thereof. The additive comprises: 65%-90% of sulfur, EVA? 4%~15%, PSBR? 5% to 15%, hydroxide 1% to 5%. The preparation method includes the following steps: uniformly mixing sulfur, ethylene-vinyl acetate copolymer, powdered styrene-butadiene rubber and hydroxide, conveying the mixture to an extruder for extrusion and granulation to obtain the additive. The additive of the invention has little pungent smell during the preparation process, and adding the additive of the invention into the asphalt mixture can effectively improve the anti-rutting performance of the asphalt pavement, improve the anti-water damage performance, and simultaneously take into account the low-temperature performance.

Description

technical field [0001] The invention relates to an additive for improving the performance of asphalt pavement, in particular to an additive for improving the rutting resistance and water damage resistance of the asphalt pavement, its preparation method and application. Background technique [0002] Due to the increasing number of vehicles in our country and the heavy load of transportation, the phenomenon of rutting and wrapping on asphalt pavement is becoming more and more serious, especially in the hot areas in southern my country. In addition, in areas with a lot of rain in the south of my country or along the coast, water damage to asphalt pavement caused by stone falling off due to rainwater penetrating into the asphalt mixture surface layer or even the base layer is also more prominent. These two phenomena have become the main damage forms of asphalt roads in our country, seriously affecting the driving safety, service level and service life of asphalt roads. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26C04B26/26
Inventor 范思远陈保莲宁爱民李志军程国香张静陈闯
Owner CHINA PETROLEUM & CHEM CORP
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