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After this interview, then-Senator John F. Kennedy calls Meet the Press the nation's "fifty-first state.
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After the interview, Hoffa was furious about being asked whether his insistence on dealing only in cash and keeping few records gave the appearance of impropriety. The potential Senate candidate was coached by his older brother, President John F.
On the day of the program, President Kennedy delayed his departure from Palm Beach in order to watch the show, but later told his brother that he was almost too nervous to watch.
Ronald Reagan, making his first bid for public office, appears on "Meet the Press" with his Democratic opponent for the governorship of California, the incumbent Gov. Reagan appeared on "Meet the Press" seven times -- all before he was elected president.
Rolling Patterns To Achieve Density And Production | Construction Equipment
Kennedy makes his ninth -- and final -- appearance on "Meet the Press" with Lawrence E. Kennedy was assassinated in California less than 3 months later -- shortly after claiming victory in that state's Democratic presidential primary. He was 42 years old. He has since appeared on the program as a U. Senator from Massachusetts 21 times. After she was elected Prime Minister inGandhi grew more concerned about her television image and contacted "Meet the Press" to request makeup samples used during her appearance on the program.
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. 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. Compact the joint for uniform density. 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.
Select a compactor based on effective rolling width. 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. The difference between EDW and drum length can be significant. Generally, these two dimensions are within 10 percent.
Several examples in Figure 3 click to enlarge shows this relationship. The width of the paved panel in Figure 3 requires three side-by-side passes of the compactor to provide complete coverage.
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Unfortunately, even the best operator will fail to achieve uniform pavement density when making a rolling pattern like the one shown, since the compaction forces are not evenly applied across the width of the panel.
The fifth pass overlaps the pavement surfaces compacted during the first four passes, but gives only a single pass over the middle 18 inches of the panel. This means density will be lowest in the center, slightly higher at the outer quarters of the panel, and highest in the sections where three drum passes were made.
This does not meet the necessary requirements. The narrow rolling width also interferes with the ability of the operator to keep up with the paver. Notice in Figure 4 click to enlarge that only two side-by-side passes are needed to completely cover the same panel width from Figure 3.
This is due to a compactor with a wider EDW. The well-trained operator on a compactor with inch drums is able to compact the panel with uniform coverage except in the exact center where the side-by-side passes overlap slightly.
Using this breakdown rolling technique will achieve uniform density across the panel and help achieve requirements. It is also possible to have drums that are too wide for the panel. In Figure 5 click to enlargethe compactor drums are 84 inches wide.
The center of the panel is receiving twice as much compaction force as the outer sections. Because a compactor with drums too wide for the pavement was used, breakdown rolling results will fail to achieve requirements.
In addition, the larger compactor has higher ownership and operating costs, so there is reduced payback to the contractor on the investment.
This is the reason nearly all manufacturers produce highway-class compactors with drums in three basic widths: The major contribution of the compactor to the paving train is the ability to achieve density. Selecting a compactor size is sometimes based on what is in a contractor's fleet.