Special low-viscosity easy-dispersion regenerant for modified asphalt and preparation method thereof

Abstract

The invention provides a special low-viscosity easy-dispersion regenerant for modified asphalt and a preparation method thereof. The regenerant comprises the following components in parts by weight: 80-100 parts of regeneration composition, 1.0-10 parts of vulcanizer, 0.5-10 parts of accelerator, 1-10 parts of activating agent, 0-5 parts of anti-reducing agent, 0.1-2 parts of scorch retarder and 0.1-3 parts of antioxidant. The invention also discloses the preparation method of the asphalt regenerant. The processing steps comprises: a, pre-heating a reaction kettle, slowly adding the regeneration composition weighed in proportion into the reaction kettle, gradually heating to 40-100 DEG C and continuously stirring; b, putting the vulcanizer weighed in proportion into the reaction kettle, continuing to heat until the temperature is 50-130 DEG C, accelerating the stirring speed until the vulcanizer is evenly dispersed; c, continuing to rapidly stir and gradually cooling, as well as adding the scorch retarder and the antioxidant which are weighed in proportion in the process of stirring and cooling; and d, while cooling to 20-60 DEG C, adding the activating agent, the anti-reducing agent and the accelerator which are weighed in proportion, evenly stirring, and cooling to room temperature so as to obtain the special low-viscosity easy-dispersion regenerant product for the modified asphalt. The low-viscosity easy-dispersion regenerant has the characteristics of available raw material, simple preparation process and sustainable development, and meets green ecology.

Description

technical field [0001] The invention relates to road paving materials, in particular to a low-viscosity, easily dispersed regenerant suitable for road waste modified asphalt and a preparation method thereof. Background technique [0002] Compared with ordinary asphalt, modified asphalt has better road performance. The road surface paved with it has good durability and wear resistance, and realizes no softening at high temperature and no cracking at low temperature. Therefore, it is used on more and more roads. It has been widely used in engineering. There are many ways to prepare modified asphalt, including chemical modification, physical modification, etc. At present, it is commonly used to improve the performance of asphalt by adding modifiers. Styrene-butadiene-styrene block copolymer (SBS ) modifier is currently the most widely used asphalt modifier in the world, and SBS modified asphalt occupies a dominant position in my country. [0003] However, recent studies have s...

AI Technical Summary

Problems solved by technology

[0005] The School of Transportation of Southeast University has conducted research on the rutting performance of aged modified asphalt mixtures and asphalt mixtures added with ordinary regenerants. The results show that the aged modified asphalt still has good anti-rutting ability due to aging and hardening of asphalt. , the dynamic stability is 4800 times / mm, while the dynamic stability of the asphalt mixture added with ordinary regenerant is only 2800 times / mm. It can be seen that although ordinary regenerated agent can restore the performance indicators of asphalt (softening point, penetration and other indicators) ), but the anti-rutting ability of asphalt mixture is greatly reduced. It can be seen that ordinary regenerants cannot meet the regeneration requirements of modified asphalt. Therefore, it is necessary and urgent to develop a special regenerant suitable for road recycling of modified asphalt

[0006] At present, in the process of reclaiming asphalt pavement at home and abroad, many projects add petroleum resins, modifiers, and other anti-rutting agents to improve the performance of rutting resistance and cracking resistance of regenerated asphalt pavement. The improvement or improvement effect of the road performance is not obvious, and the main problem of modifiers or anti-rutting agents is that it is difficult to disperse, so the performance of recycled asphalt pavement is often not ideal