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Download Now Name your own price. Click download now to get access to the following files: Evolution - Linux 24 MB. Sticky Evolution Gif Collection. Sticky Bugs. Neuron network size. When any one of these items is out of balance, productivity drops. Most paving contractors know precisely how many tons of mix the asphalt plant is capable of producing on an hourly basis. The contractors know the storage capacity of the silos.
Contractors determine whether the plant will be providing mix for only one project or for multiple projects at the same time. If the contractor does not own a plant and must purchase mix from another producer, the number of tons of mix to be purchased is usually a contract item and of predictable supply. Contractors also know the size and capacity of the transport trucks used to deliver hot mix asphalt HMA to the project.
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From experience, contractors estimate the round-trip transportation time from plant to job site and determine how many loads each truck can deliver per unit of time. When it comes to laydown and compaction, predictions on productivity are less certain. Especially for compaction , the variables of how much HMA is produced and when it is delivered influence the temperature of the asphalt when compacted. Mix temperature is the most critical element in compaction.
Keeping compactors in the proper rolling zone to achieve target density requires the right rolling patterns. There are several procedures that compactor manufacturers teach operators to increase productivity.
Since nearly all breakdown rolling today utilizes vibratory double-drum compactors, the following best practices concentrate on operating of this type of compactor. The first pass achieves the most air void reduction because the mix viscosity is low and the ability to rearrange aggregate particles into closer orientation is high.
If the edge of the pavement is supported against lateral movement, the operator should slightly overlap the joint between cold and hot panels. The more skilled the operator, the narrower the overlap of the joint needed. Most operators need only 3 inches to 4 inches of overlap. If the edge of the pavement is unsupported, the operator should make this first pass 6 inches to 8 inches away from the edge to reduce lateral shoving of the mat.
Stiffer mixes may not require this precaution. Figure 1 shows the proper drum orientation to the pavement on the first pass. Stop forward motion of the compactor, rolling in a slight arc toward the center of the panel, a safe distance behind the paver and crew.
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The reason for stopping on an angle is to facilitate rolling out drum depressions on the next pass. This helps prevent formation of bumps on the pavement. Figure 2 shows the technique. The pass on the left side of the panel stops in an arc and the compactor returns on the same path. The next forward pass is on the right side of the panel, passing the previous forward pass, with an arc toward the center of the panel.
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This technique permits the compactor to achieve more uniform density by staying in the same range of temperature with each side-by-side pass. Roll the end of each subsequent pass beyond the end of the adjacent and previous pass. This is also shown in Figure 2. Following the forward motion of the paver keeps the breakdown compactor in the same relative temperature range of the mat as the paver.
Limiting the length of the breakdown rolling zone helps the front compactor keep up with the paver.
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There is no more important technique in compaction, especially for stone mastic asphalt SMA and Superpave mixes. Complete breakdown rolling before the mix cools below a temperature consistent with achieving target density. This technique accomplishes two objectives. For the majority of mixes, it permits the highest production to be achieved.
For those mixes that exhibit tenderness, this permits density to be reached before the mix begins toexhibit instability. One of the more common deficiencies found in HMA pavements is low joint density.
Low density at the joint is caused by poor paving technique, excessive luting and raking, poor rolling practice, or a combination of these. Poor rolling practice can be overcome by proper training of compactor operators and through experience. The Ingersoll Rand Road Institute offers a number of courses that teach compaction techniques to paving crews. The length of the compactor drum is not the true measure of the productive capacity of the compactor.
Rather,effective drum width EDW is the important metric.