ASPHALT ANSWERS
Chip Sealing can be an effective , economical solution to paving rural or private roads .
After the area to be worked has been cleaned and free of any residual dirt , rocks or dust , we must put a layer of asphalt emulsion , typically the same design you use for tack but at a higher application rate . If we are using our distributor truck for tack , we are probably applying at a rate of . 05 gallons per square yard , but for chip sealing , we will apply at closer to . 3 gallons per square yard . This means at 8 feet wide , we will use over 1,400 gallons of emulsion per lane mile . If you are working the spreader at 150 feet per minute , you ’ ll complete a lane mile in well under an hour if you have your trucks lined up . If your goal is high production , you will certainly run your distributor out of emulsion rather quickly , so it ’ s a good idea to have a tanker on standby . Next is the application of aggregate , or “ chips ”. The old style chip spreaders were manual units that required you to gauge the application rate manually . If you were too light or heavy , you just pulled the lever
back a little . Today ’ s units are computer controlled and will lay a metered layer of aggregate that is measured in pounds per square yard . This amount is usually calculated by an engineer depending on the size of aggregate used and needs to be a washed , graded aggregate . Similar to asphalt paving , larger aggregate is used as a base layer and smaller aggregate is used for surface . The finished result allows you to see a little bit of the emulsion between the aggregate so the wearing surface is a layer on top of the emulsion . For road rejuvenation , only one lift is required . For new road building , 2 or even 3 lifts will be performed . Finally , the finished product must be rolled with a pneumatic roller . Unlike asphalt paving , you are not trying to achieve density , only “ setting ” the material in place . That ’ s why a pneumatic roller is most desired . Since you are not rolling a flexible surface , a steel drum roller will only fracture the rock and create an undesirable finished product . Like asphalt , however , the entire surface must be rolled to ensure the aggregate properly bonds with the emulsion . Optionally you can broom the surface after the emulsion has cured , usually the next day . Some contractors or municipalities will top the finished surface with sand to further fill the voids . All is just a matter of technique . A quick internet search will give you a lot of information not described here such as videos and photos . Chip sealing has certainly made a comeback in the last 10 years and doesn ’ t seem to be slowing .
Brian Hall , LeeBoy Territory Manager . He can be reached via email at Brian . Hall @ Leeboy . com .
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