For Pass Two, he did the same. We’ll wrap up with a quick review of intelligent compaction (IC) use. Poor rolling practice can be overcome by The length of the compactor drum is not the true measure of the productive capacity of the asphalt rolling machine. At the back of Pass Two, the operator crossed on the coolest part of the mat to the other side of the lane, and then performed Pass Three, rolling to a gentle stop when the roller was within about 50 feet of the paver. Develop Your Best Rolling Pattern Part 1.
But the tires will start wrapping the material around them, grabbing more and more, creating a mess of the mat, according to Ball. It has low pressure and it needs to be reinflated. Or they may run a second breakdown. @ Copyright 2020 Construction Equipment. “Draindown occurs due to the low surface area of the aggregate and can result in bleeding in the surface of the pavement.”One of the ways the team solves the problem of draindown is to call the plant. For the majority of mixes, it permits the highest production to be achieved. “He may be able to roll a little closer to the screed when he uses the lubricating additive,” Ball said.For typical rolling patterns, Ball reminded operators that it’s generally acceptable to roll within 50 feet of the screed, which equals about two lengths of the paver. That means the roller operator’s equipment must be in perfect working order, as we discussed in September, and his skills must be honed with excellent training and continued review. Generally, these two dimensions are within 10 percent.
There are several procedures that compactor manufacturers teach operators to increase productivity.
Because a compactor with drums too wide for the pavement was used, breakdown rolling results will fail to achieve requirements. If one reads lower than another (80 instead of 120), it’s flat. When you add a release agent to the tank, the amount of water use lessens and the roller can get a little closer to the screed where the mat is still hottest.
You’ve got to go up and back a third time, for a total of nine minutes, to get full coverage of the 12-foot lane. Sometimes higher roller frequency and lower amplitude is used for thinlays. Photo courtesy Bomag Americas, Ridgeway, South CarolinaBall calls the pneumatic tired roller your secret weapon. He’s going to share the what, why and how to get density numbers and smoothness for the job.Don’t forget to take time to know your compaction equipment. They need a meeting at the start of the day to learn the what, why and how for the rolling pattern(s).In the old days of all-visual control, the supervisor was generally the one giving the roller operator his cues. This is another reason why the members of the compaction team need to be aware of equipment size and capability. Following the forward motion of the paver keeps the breakdown compactor in the same relative temperature range of the mat as the paver.
Let’s take a look at how that works.First, the condition of the subbase is more complex than this article will go into. You are the person who gets the aggregates and fines that are in the mix to fit together like a puzzle within their layers, so that they form a strong and supportive, yet still flThe Paving Amplitude Calculator App from Caterpillar Paving Products, Peoria, Illinois, is designed to help the operator determine the proper amplitude setting for the roller. Even though the controls are designed to be user-friendly, the OEM’s dealer needs to explain the system to the operators until they understand it.
Your dealer can tell you the specifications for your model’s tire.Now here’s a tip for keeping tire pressure even throughout the shift. Brown described it as “similar to bleeding or a fat spot.” If you roll this area, the fat spot becomes permanent and friction at that spot is lessened.