In order to properly prepare the pothole for asphalt repair, there are several steps that must be taken. First, prepare the pothole by driving out the moisture and blowing out contaminants. Next, heat the edges of the pothole to the correct temperature of the asphalt repair material. This will ensure a good bond. If you follow these steps, you’ll be well on your way to successfully repairing your pothole.

Heat exchanger

How to build an asphalt heat exchanger? In this article, you will learn how to construct the pipe assembly, including the insulating layer and the binder. The pipes are laid in parallel with the construction of the integration layer, to ensure that they are in optimal contact with the asphalt mix. The construction of the pipes in this way also limits the presence of void spaces. The pipes are indented into the integration layer during the implementation period, which is determined by the workability of the asphalt mix.

An important thing to remember when determining the right flow rate is that bigger L/K ratios control the amount of heat exchanged by the asphalt. The temperature gradient will be higher with a large L/K ratio than a small L/K ratio. The lower the flow rate, the lower the temperature gradient. The optimal flow rate for a built system is 0.12 L/s. The flow rate is important because smaller pipes heat a small volume of water at a higher rate than larger ones.

Dual hopper

Dual hopper asphalt hot boxes provide better heat distribution than single hopper machines, and they help recover cold asphalt as well. When used as a hotbox, the loading doors open to form a chute for virgin hot mix, and unloading doors lock up in the up position to prevent accidental closure. Dual hoppers also have sloped sides to aid in the removal of hot mix. Dual hoppers are available in single and triple-slope designs.

A dual-hopper asphalt hot box is the most common type available. It is mounted on the truck’s deck and is capable of maintaining an asphalt temperature for up to 48 hours. The hopper is heated by two infrared heaters, and a PLC monitors the temperature. The automatic spark ignition system has a safety feature that keeps the hot box running at a pre-set temperature. Dual hopper asphalt hot boxes feature two infrared heaters, so that the entire hot mix does not overheat. This type of asphalt recycling equipment is available in capacities of two, three, or four tons.

Side walls

An asphalt hot box has two main components: the lid and the side walls. The lid covers the heat exchanger, and the sides are used to keep the asphalt hot. The lid and the side walls form an airtight seal, and the lid provides an accessible access panel. In addition, the lid incorporates a three-position shoveling door, and the entire unit is raised up to 26 inches off the ground. The unit sits atop a tandem axle trailer with a GVWR of 7,000 pounds.

The end wall contains two service doors that are used to unload the hot asphalt from the hot box. This service apron is supported by hinges 28 on mounting plates 29. The apron can be adjusted to varying heights, and the top wall tilts and drops asphalt at varying rates. This allows the technician to customize the level of the hot asphalt in each pothole and ensure that it is delivered in the correct place.


An asphalt hot box can be a simple, portable unit. The unit consists of a container that extends 96 inches from side to side, a bed plate, a bottom wall, and a roof. The roof, or the heat exchanger, is 50 inches high. The whole unit can be transported on a truck and can be unloaded when the work is complete. The roof is equipped with lifting lugs at the corners to help ease the unloading process.

The present invention provides a heat-transfer system for an asphalt hot box. The heat-transfer system transmits heat from the burner to the asphalt through the air-tight container. The heat-transfer system also provides a uniform heat-conducting surface for the asphalt. It is advantageous to have a single supply depot for asphalt, because one unit can supply asphalt to several locations without requiring several depots.


A hot box is a building in which the heated asphalt emits fumes and vapors. Fumes are small particles of up to one micrometer in diameter and are emitted by heated asphalt. Particle dispersions were studied by the Stanford Research Institute in 1961. Today, we can use SF6 gas or smoke aerosol to simulate the emissions that asphalt generates. However, there are several important safety considerations that need to be addressed when building an asphalt hot box.

A hot box reclaimer is a specialized piece of equipment that heats an asphalt mixture. It is usually made of triple walls and an air space between the holding chamber and the asphalt. The hot box’s heating system is powered by a PLC and features automatic spark ignition for added safety. It is important to understand how propane and diesel heat asphalt to ensure that the material is heated properly and does not overheat.

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