Thermal storage stable rubber-plastic composite modified asphalt and preparation method thereof

Abstract

The invention discloses rubber-plastic composite modified asphalt with stable thermal storage. The rubber-plastic composite modified asphalt is prepared from matrix asphalt, waste tire rubber powder, polyethylene and a 264 antioxidant, wherein the content of the waste tire rubber powder is 10-35% of the weight of the matrix asphalt, the content of polyethylene is 3-10% of the weight of the matrix asphalt, and the content of the 264 antioxidant is 1.0-5.0% of the weight of the waste tire rubber powder. A preparation method of the rubber-plastic composite modified asphalt comprises the following steps: (1) heating the matrix asphalt into a hot melt state, slowly adding a well weighed mixture of the waste tire rubber powder, polyethylene and 264 antioxidant, and stirring to mix uniformly; and (2) heating the modified asphalt mixture of the step (1) to 170-210 DEG C, and performing high-velocity shearing for 30-120 minutes. The modified asphalt prepared by the method disclosed by the invention improves the high-temperature rut resistance, low-temperature crack resistance and thermal storage stability of asphalt, and is not easy to segregate, so that the cost of the modified asphalt is reduced, and the process is simple and is beneficial for popularization and application of the modified asphalt.

Description

technical field [0001] The invention relates to a preparation method of modified asphalt, in particular to a rubber-plastic composite modified asphalt with good high and low temperature performance and stable heat storage and a preparation method thereof. Background technique [0002] With the rapid growth of highway traffic volume, large-scale vehicles, heavy loads, overloading, and channelized traffic have become increasingly prominent, resulting in damage to the asphalt concrete pavement after a short period of time, affecting the normal operation and service life of the road. In addition, the strong sensitivity of asphalt to temperature leads to problems such as high-temperature rutting and shifting in summer and low-temperature cracking in winter on asphalt concrete pavement. In view of this, improving the temperature sensitivity of asphalt by adding polymer modifiers has become an effective way to improve the pavement performance of asphalt pavement. [0003] At prese...

AI Technical Summary

Problems solved by technology

However, although most of the above-mentioned polymer modifiers can significantly improve the road performance of asphalt materials, their high prices will undoubtedly greatly increase the cost of modified asphalt, thus restricting the promotion and application of modified asphalt

[0004] When waste tire rubber powder or PE is used as the asphalt modifier, since the waste tire rubber powder and PE are very different from the base asphalt in chemical structure, density, viscosity, molecular weight, etc., they are extremely dissimilar in thermodynamics. Therefore, the waste tire rubber powder or PE-modified asphalt has thermal storage stability problems

Images