Directly-mixed rubber asphalt mixture and production method thereof

Abstract

The invention relates to a rubber asphalt mixture and a preparation method thereof. The mixture is prepared with the following components in proportion by weight: gradation stone: petroleum matrix asphalt: rubber powder modifier= 89 to 94: 4 to 6: 2 to 5, and the rubber powder modifier comprises the following component in proportion by weight: rubber power: hexanediol= 100: 3 to 7. The preparation method of the mixture comprises the following steps that: the hexanediol is doped in waste tire powder according to the proportion to be mixed and moistened to obtain the rubber powder modifier; mineral aggregates are heated to the temperature of 210 to 220 DEG C, and then rubber powder modifier and petroleum matrix asphalt are added into the mineral aggregates at the same time to be mixed for 40 to 60 seconds to obtain the mixture. The method is free from pre-mixing the rubber powder and the stone, is simple, and can realize the transformation from rubber to oil, and the petroleum-stone ratio of the mixture can be reduced to 6 to 8. All technical indexes of the directly-mixed rubber asphalt mixture are higher than the industrial standard, and the directly-mixed rubber asphalt mixture can be used for the road construction and water prevention and leakage prevention of roof and tunnels.

Description

technical field [0001] The invention relates to a method for producing rubber asphalt mixture and the produced rubber asphalt mixture. Background technique [0002] Rubber asphalt is a product obtained by mixing rubber powder and asphalt in a certain proportion. It is a binder used in the construction of various types of flexible road surfaces. The mixture obtained by mixing rubber asphalt and mineral aggregates is called rubber asphalt mixture, and when it is paved and rolled, it is also called rubber asphalt concrete. At present, rubber asphalt pavement technology has formed a relatively complete wet process and dry process. The dry process is a production method in which rubber powder is added to mineral aggregates, put into the mixing building, and hot asphalt is added to mix to produce rubber asphalt mixture. The wet process is a production method in which rubber powder and asphalt are first mixed to form rubber asphalt and then mixed with mineral materials to produce...

AI Technical Summary

Problems solved by technology

However, due to the short preparation time of the dry rubber asphalt mixture, which is only about 1 minute, the rubber particles in the dry rubber asphalt mixture cannot complete the process of desulfurization and degradation, and cannot perform material exchange with asphalt to modify the asphalt , can only be used as an aggregate, and has no obvious effect on improving the performance of asphalt pavement

Therefore, the performance of the existing dry-process rubber asphalt mixture is poorer than that of wet-process asphalt, especially the water stability is poor. During the production process, additives such as cement and salt lime are often added to improve water stability.

Due to the poor adhesion of rubber particles and poor miscibility with mineral aggregates, pre-mixing of mineral aggregates and rubber particles is required, which affects the heat storage of the mixture and limits the paving and rolling time, making the paving molding Rubber asphalt concrete is only suitable for the middle and lower layers of roads due to its low quality

And when the dry rubber asphalt mixture is mixed, the rubber asphalt will absorb the same volume of asphalt, which will increase the asphalt ratio of the mixture (mass ratio of asphalt to mineral aggregate), which limits the amount and quality of the rubber powder modifier and increases cost of rubberized asphalt mixture

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