Composite modified rubber asphalt mixture and preparation method thereof

Abstract

The invention discloses a composite modified rubber asphalt mixture. The composite modified rubber asphalt mixture is prepared by the following raw materials by mass: 5-10 parts of waste tyre rubber, 10-15 parts of polyethylene wax, 30-40 parts of petroleum asphalt, 0.02-0.1 part of a thermoplastic resin and 30-45 parts of an aggregate. A preparation method of the composite modified rubber asphalt mixture comprises the steps of preparing improved rubber asphalt by using the waste tyre rubber, the polyethylene wax and the petroleum asphalt according to the above mass proportions under a certain condition; adding the thermoplastic resin to modify the improved rubber asphalt; and finally mixing the modified improved rubber asphalt with the aggregate thoroughly under a certain condition to obtain the composite modified rubber asphalt mixture. The composite modified rubber asphalt mixture is reasonable in proportions, and effectively increases the anti-aging performance, adhesive property and high temperature stability of the improved rubber asphalt. The preparation process is simple in flow, convenient for operations, wide in raw material resources and low in cost, reduces production cost and can be popularized in large scale easily.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a composite modified rubber asphalt mixture and a preparation method thereof. Background technique [0002] Rubber asphalt refers to the modified asphalt interface material obtained by the swelling reaction of tire rubber powder with a content of more than 15% under the condition of high temperature and sufficient mixing with asphalt. Compared with ordinary asphalt, rubber asphalt has improved high temperature and low temperature stability and anti-aging performance. Rubber asphalt pavement has better driving comfort and can effectively reduce the vibration and noise generated by the interaction between automobile tires and the road surface. It is widely used in road construction in our country. Since rubber asphalt uses recycled tires as the main material for modification, it has a cost advantage over styrene-butadiene block copolymer (SBS) modified asphal...

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Problems solved by technology

[0004] In recent years, a new method of preparing rubber asphalt mixture by combining dry method and wet method has appeared. However, due to the limitation of material selection and other factors, the rubber asphalt mixture prepared by this method is not good in adhesion performance and high temperature performance. satisfactory

The main reason for insufficient adhesion performance is that more than 15% of rubber powder is added to rubber asphalt, resulting in too thick asphalt, so it is difficult to coat the surface of stone materials; the main reason for poor high temperature performance is that the adhesion performance of rubber asphalt and stone materials is reduced After that, the high temperature performance is also reduced. In addition, the content of asphalt added to the rubber asphalt mixture is relatively high, which is about 50% higher than that of ordinary asphalt mixture. The mixture with relatively high asphalt content has poorer high temperature performance.

If modifiers are added to the rubber asphalt, the viscosity of the rubber asphalt will be higher. Although there is a patent to add it through the dry method, it will still increase the construction difficulty of the rubber asphalt mixture.

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