FAQ: Pavegrip® Hot Mix Adhesion Promoter
Answers to frequently asked questions about Pavegrip® asphalt adhesion.
You’re wondering about hot mix asphalt adhesion. Here are answers to your burning questions about Pavegrip® storage temperature, packaging, shelf life and injections into asphalt cement.
How does Pavegrip improve hot mix asphalt?
Pavegrip is an antistripping additive which helps to improve the tensile strength ratio (TSR) of the mix. Aggregates have a natural affinity for water. In fact, each stone has an invisible film of moisture even after drying. Pavegrip helps disperse the moisture allowing for a stronger bond of the liquid asphalt to the aggregate. This is also true for dust on the surface of the aggregate. Pavegrip helps disperse the dust to help improve the bonding. This action improves TSR’s improving test results such as the TSR test of AASHTO T 283.
How is Pavegrip added to the mix?
Pavegrip is injected into the liquid asphalt cement. Three methods are recommended for injecting Pavegrip Additive to your asphalt cement:
- At the asphalt terminal, the correct amount of additive can be placed in the bottom of the tanker before the asphalt cement is loaded (added either manually or pumped in). When the asphalt cement is loaded the turbulence will provide sufficient mixing;
- Simple drum or tote use at the plant when unloading a tanker of asphalt cement. This method involves placing a Tee in the line before the asphalt cement unloading pump. Using a scale and a flow control valve, the proper amount of additive can be drawn into the line using the suction of the unloading pump.
- Use of a storage tank with a metering system (with metering pump) is the most accurate and most common. In this case controls are used to set the flow rate of the additive into the tank during unloading of the asphalt.
What is the recommended dosage of Pavegrip?
The typical dosage of Pavegrip is 0.25% to 0.75%. But on average the most widely used dosage is 0.5% Pavegrip (based upon the weight of the liquid AC).
What is the shelf life of Pavegrip?
Pavegrip has five year shelf life. If the product is stored outside during the winter in a drum or tote a small amount of mixing may be required if the product cannot be warmed up. But after this the product is ready for use.
What is the recommended storage temperature for Pavegrip?
The recommended storage temperature is 100º to 120º F.
What type of packaging does Pavegrip come in?
Packaging includes 55 gallon drums (440 pounds net), 275 gallon totes (2,205 pounds net) or in various bulk quantities.
In addition to the many product benefits from low odor and improved handling characteristics, another key to the product is superior customer and technical service. The combination of technical support and customer service provides customers with all the help they need from mix design on through.
Why are their different grades of Pavegrip?
Different aggregates require different active ingredients, especially in the case of difficult mix designs. Also, some customers need the increased tensile strength, but need an economical option.