Reparation method and construction method of warm mix asphalt mixture

Abstract

The invention discloses a preparation method and a construction method of a warm mix asphalt mixture. The preparation method comprises the following steps: testing all performance indexes of a warm mixing agent and matrix asphalt; adding different addition amounts of the warm mixing agent into the matrix asphalt to prepare warm mix asphalt; commonly testing all performance indexes of the warm mix asphalt by adopting a penetration grading evaluation system and a PG grading evaluation system, and determining the best addition amount of the warm mixing agent; and preparing the warm mix asphalt mixture. The warm mixing agent is a Sasobit warm mixing agent, and the best addition amount of the warm mixing agent is 2.5-3.5% of the mass of the matrix asphalt. The construction method comprises the steps of warm mix asphalt mixture mixing, transportation, spreading and compaction. The preparation method and the construction method of the warm mixing asphalt mixture are simple, the mixing temperature substantially decreases, the discharge of harmful gases is substantially reduced, the cost is reduced, and the road performances of the asphalt and the asphalt mixture are comprehensively improved.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and relates to the preparation technology of warm asphalt, in particular to a preparation method of warm asphalt mixture and a construction method thereof. Background technique [0002] Sasobit warm mix agent is a product developed by Sasol-Wax in Germany. It is an organic additive with a high melting point. It can be obtained from coal gasification by the Fischer-Tropsch (FT) method, also known as FT paraffin wax. . It is a fine crystal and usually exists in two forms: one is powder, for melt addition; the other is solid small particles (such as pellets), for direct addition. [0003] Sasobit warm mix is ​​a narrow distribution mixture of synthetic saturated hydrocarbons, a hard wax. It is well known that high wax content in asphalt will have a significant negative impact on the performance of asphalt, but adding a certain amount of Sasobit will not cause this problem. This is becaus...

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Problems solved by technology

Moreover, most polymer modifiers will greatly increase the viscosity of asphalt (especially the viscosity at 135°C), resulting in higher energy consumption during processing

It can be seen that the preparation process of traditional polymer modified asphalt is complicated, the energy consumption is high, and its storage stability cannot be guaranteed.

[0005] Zhai Xiang and others studied the influence of Sasobit warm mix agent on the water stability of asphalt mixture in the article "The Effect of Sasobit on the Water Stability of Asphalt Mixture". For -13C warm asphalt mixture, Marshall specimens were made according to the indoor mixing and molding temperature. The experimental results show that the water stability of Sasobit warm asphalt mixture is slightly worse than that of ordinary asphalt mixture, so it is impossible to judge the Sasobit Effect of Warm Mixing Agent on Asphalt Water Stability Improvement

[0006] Zhao Ziling studied the effect of the addition of Sasobit warm mix agent on the performance of asphalt mixture in the article "Sasobit Application Evaluation in Warm Mix Asphalt Mixture". The research results pointed out that the addition of Sasobit may increase or decrease. The water damage resistance of asphalt mixture, so it is impossible to judge the improvement effect of Sasobit warm mix agent on the water stability of asphalt mixture

[0007] At present, in the research on using Sasobit as warm mix agent to improve the performance of asphalt mixture, it is generally reflected that the water stability of warm mix asphalt mixture is poor, and it is impossible to correctly judge the improvement effect of Sasobit warm mix agent on the water stability of asphalt mixture

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