Introduction of high modulus agent
Keywords
High modulus agent, road building additive, high modulus asphalt concrete
Overview
A high modulus agent is a commonly used mixed material additive. The appearance is dark, solid and granular. It is a direct-injection externally-mixed asphalt mixture modifier. Adding the modifier to the asphalt mixture can significantly increase the dynamic modulus of the asphalt mixture.
The modulus is the ratio of stress to strain. Under the condition of certain stress, the increase of the modulus will reduce the strain, and the response to the pavement structure is that the modulus increases and the pavement deformation decreases.
High modulus asphalt concrete achieves the purpose of improving stiffness modulus and fatigue resistance through the characteristics of hard binder, high binder content, and low porosity.
Production Process
The high-modulus agent is a graft compound formed by mixing a variety of high-molecular polymers and auxiliary agents through a screw extruder under specific process conditions.
Raw material composition
Polyethylene, polypropylene, maleic anhydride, rubber, antioxidants, antioxidants, dispersants, etc.
Instructions
High-modulus admixtures are often used in the middle and lower layers and base layers, especially the base layers of flexible asphalt pavement structures.
High modulus asphalt mixture additives are divided into two types: direct feeding and asphalt mixing;
It is used for the middle and lower layers of the road, and has little effect on the low temperature cracking resistance of the mixture.
Performance advantage
Admixtures that can significantly improve the stiffness modulus and fatigue resistance of asphalt mixtures are called high-modulus additives, and asphalt concrete with high-modulus additives is called high-modulus asphalt concrete.
Improve asphalt viscosity, dynamic modulus of asphalt mixture;
Fiber reinforcement, which is drawn into plastic fibers during mixing to produce fiber reinforcement for aggregates;
Prevent long-term deformation of asphalt pavement.
Scope of application
Roads with heavy traffic and heavy loads that are prone to rutting;
Mountainous and hilly areas, winding roads, long and steep slopes;
Heavy traffic roads in tropical high temperature areas;
Highways, urban arterial road intersections, airport runways, etc.
