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 Cold milling involves removal of the existing asphalt surfacing of a roadway, runway, or other asphalt surface. Cold milling is also referred to as cold planing or grinding. The milling machine is equipped with a cutting mandrel which is designed to move the milled material to the center of the mandrel or drum where it drops on to a conveyor. The milled material can then be placed either on the ground or loaded into trucks. The conveyor has the capability to swing right or left to place the material directly on the shoulder of a roadway or directly into trucks to be hauled away. Once it is loaded into trucks, it can be utilized in a number of different ways. It is common to haul the milled material to a hot plant to be incorporated into the hot mix being placed back on the roadway. This is what is known as hot plant recycling. It can also be stockpiled and incorporated into a hot plant recycle process at a later date. If the existing asphalt surfacing is deteriorated to the point where it has been determined that is cannot be utilized in a hot plant recycling process, it is commonly used as shoulder backing material or as a base material. In those instances, it can be placed directly on the shoulder as previously mentioned, or it can be placed in trucks and hauled to designated areas. Another important use of milled material is in the stationary cold recycling process. The major difference between cold in-place recycling and stationary cold recycling is the asphalt pavement that is milled or removed from the roadway is hauled to a stockpile site and processed at a later date. This recycled material can be laid and compacted on another roadway or it can be left in a stockpile for later use. Different recycling agents can be used which will determine how quickly the recycled material will set up. If the recycled material is going to be left in stockpile for later use, the proper recycling agent will allow it to remain in a stockpile for a period of time. The workhorse in all of this is the asphalt milling machine or rotomill. These are high horsepower machines capable of removing up to 10" (250 mm) of asphalt surfacing at one time. The rotomill has been an important tool in roadway rehabilitation for over 20 years. Owners and specifiers have long ago realized that existing asphalt surfacing has a value and can readily be recycled. Cold milling will always be an important element of the roadway rehabilitation industry. Valentine Surfacing Company began in 1978 as a cold milling contractor. Over the years we have branched out into cold recycling, pulverizing, and soil stabilization but the foundation of our company remains in the cold milling process. We are proud of our reputation for quality, high production, and dependability. We are known throughout the western United States as one of the premier cold milling contractors in the business. Valentine Surfacing Co. offers an array of roadway services: |
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