Calcium sulfate whisker-modified asphalt and preparation method thereof

Abstract

The invention belongs to the field of preparation of asphalt mixtures and discloses calcium sulfate whisker-modified asphalt and a preparation method thereof. The preparation method comprises the following steps: heating matrix asphalt to a flow state, screening, re-heating to a flow state, then keeping in a constant-temperature state for stirring, adding 2-8 percent by weight of calcium sulfate whisker while stirring, and continuously and uniformly stirring after the completion of adding to obtain the modified asphalt. The calcium sulfate whisker-modified asphalt and the preparation method thereof disclosed by the invention have the benefits that through adding the near nanoscale calcium sulfate whisker into the matrix asphalt, the phenomenon of overlarge fiber section of many calcium sulfate whisker products in the past is changed, so that the whisker section reaches a near nanoscale level, the calcium sulfate whisker has the characteristic of being in more full contact with various asphalt components; a colloid structure of the asphalt is better changed, so that the road performance of the asphalt is more excellent and economic; in the production process, the near nanoscale calcium sulfate whisker is low in energy consumption; the calcium sulfate whisker-modified asphalt self is non-toxic and nonirritant, and fully conforms to a strategic industrial policy for national sustainable development.

Description

technical field [0001] The invention relates to the field of asphalt mixture preparation, in particular to a calcium sulfate whisker modified asphalt and a preparation method thereof. Background technique [0002] Asphalt mixture is a typical viscoelastic-plastic material, which becomes soft when the temperature rises and is prone to rutting under load; it becomes hard and brittle when the temperature decreases, and is prone to fatigue cracking and low-temperature cracking under the combined action of load and temperature. [0003] Modern mortar theory believes that asphalt mixture is a multi-level dispersion system. Although the proportion is relatively small, it is the most important in the dispersion system and is the fundamental factor affecting the viscoelasticity of asphalt mixture. The resistance to permanent deformation of asphalt mixture has a decisive influence and affects the performance of the mixture to a large extent. According to the research results of the U...

AI Technical Summary

Problems solved by technology

Therefore, asphalt is very important, so researchers are increasingly trying to use fibers, inorganic fillers, polymer materials, etc. to modify asphalt. However, these materials are often difficult to take into account both the modification effect and the economy. , The energy consumption in the production process of basalt fiber is extremely high, the environmental protection pressure of the two is great, and the lignin fiber will lead to an increase in the amount of asphalt, and the cost performance is low from an economic point of view

Images