Admixing type modifier of asphalt mixture

Abstract

The invention discloses an admixing type modifier of an asphalt mixture. The modifier comprises the following components by weight: 60-80% of high density polyethylene (HDPE) with weight-average molecular weight of 80,000-150,000, 20-35% of low density polyethylene (LDPE) with weight-average molecular weight of 30,000-100,000, 10-20% of linear low density polyethylene (LLDPE) with weight-average molecular weight of 50,000-100,000, 1-5% of rock asphalt with softening point of 160+ / -10 DEG C, 3-10% of rubber powder, 1-5% of fiber stabilizing agent, 1-3% of antistripping agent and 1-2% of paraffin. The modifier adopts the above components by weight percent, can be directly added during production of the asphalt mixture by way of admixing type modification, can substantially improve the high-temperature property of the mixture and effectively improve the low-temperature property, water stability and fatigue property of the mixture after being added, so the improved mixture can meet the use requirements.

Description

technical field [0001] The invention relates to an externally-mixed modified additive for asphalt mixtures used in the paving of highway asphalt pavements, in particular to an externally-mixed additive for improving the technical performance of asphalt mixtures, especially the high-temperature rutting resistance and water damage resistance. formula modifier. Background technique [0002] Asphalt occupies a very important position in highway construction, and the vast majority of high-grade pavements in the world use asphalt pavements. In order to prevent the asphalt pavement from deforming at high temperature or breaking at low temperature, it is required that the asphalt has sufficient strength and thermal stability at high temperature, and sufficient elasticity and plasticity at low temperature. Therefore, using modifiers to improve the road performance of asphalt has become an important method to solve the problem of asphalt quality. Similar products currently on the ma...

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Problems solved by technology

[0003] Aiming at the problems existing in the above-mentioned prior art, the purpose of the present invention is to solve the existing domestic and foreign asphalt mixture externally blended modified products, which are not effective in improving the technical performance of asphalt mixture roads, especially the high-temperature performance and the price. It is cheap, or the improvement effect is significant, but the optimal asphalt ratio of the asphalt mixture needs to be changed, and the improvement effect on the low-temperature performance and water stability of the mixture is weak, and the product price is high. Low price, stable performance, low overall product cost, no need to change the optimum asphalt mixture ratio, an externally mixed modifying additive that is beneficial to the environment, and has the ability to significantly improve the asphalt mixture after being added to the asphalt mixture High temperature performance, effectively improving the low temperature performance, water stability and fatigue performance of the mixture

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