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How to Cure Concrete

Concrete Curing

Concrete must be placed, ideally between 50 degrees and 75 degrees Fahrenheit, and this temperature must be maintained during concrete curing

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Construction Spotlight10

Super Long Lasting Concrete Making its Debut

Sunday April 20, 2014
Concrete crack

A new concrete is being developed by the University of Wisconsin-Milwaukee and the most important aspect of it, is that if could last over 120 years with little or no maintenance. The new water-repellant concrete, with added fibers, is claimed to be more durable and able to keep water from being absorbed by the concrete reducing the damages water has on concrete over time. The concrete can be more ductile than concrete preventing failure and reducing cracks. The new concrete can be over 200 times more ductile than traditional concrete and its superhydrophobic qualities will result in fewer concrete cracks. Water can expand into concrete causing cracks and other damages to the integrity of the concrete and also salts will corrode steel that reinforces the concrete. The ability to continuously monitor the concrete will reduce repairs on the roads, which are a headache for everyone. However, this concrete is not made for all applications, as the fibers will reduce the ability of the concrete to flow and it is too expensive to be poured on smaller jobs, of jobs that will not require longer warranty periods. The material, which would cost more than typical concrete, would pay for itself with diminished maintenance costs if it performs as expected.

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A Transportation Hub Even More Challenging than World Trade Center's Design

Wednesday April 16, 2014

The construction of the World Trade Center is facing some significant challenges due to its complex design by Santiago Calatrava. The main structure is over 365 feet long and includes more than 11,000 tons of structural steel. One of the most challenging situation is because of the geometry proposed and the amount of welding required to complete the installation of the massive steel structure. The entire structure was modeled to determine a carefully staged erection sequence. The hub is scheduled to open some time next year. The cost of the project has almost doubled from its original estimate to nearly $4 billion. Calatrava's design is intended to evoke a white dove taking flight.

However, this amazing transportation hub could face some competitors as a new design has been unveiled for the point in the Woodside section of Queens where the number 7 subway line and the Long Island Railroad meet. Designers Chad Kellogg and Matt Bowles of AMLGM have named the project The Urban Alloy Towers, which they see as a mixed-use structure that combines the transit hub with retail and housing.

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Photo Courtesy AMLGM

New Safety Device to Reduce Construction Related Fatalities

Sunday April 13, 2014

Transportation officials are convinced that the new era of safety devices will be key influencers on reducing the number of fatalities at highway construction sites. The new device, a highway speed bump, has been announced as part of the National Work Zone Awareness Week. The device, a portable rubber rumble strip, has been designed so drivers will get a distinctive rough surface that will eventually get their attention and will became aware of the construction site they are approaching. The rubber strip will be deployed in traffic lanes that are to be gradually closed off at construction sites. The safety device is only about an inch high so they will not create hazards to drivers and smooth enough to be able to switch lanes safely. The rumble strips will be deployed with new barrels topped with flashing, self-synchronizing flashing LED lights. There were 2,749 accidents in construction zones statewide last year, down from the 10-year high of 3,651 in 2011.

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Historic Slide-In Bridge Process in Progress

Wednesday April 9, 2014
Milton Madison Bridge

The Milton-Madison Bride project is achieving a major milestone today. Walsh Construction Company who is in charge to build the new bridge, has started the process of sliding the bridge into place, the longer bridge ever slide into place in North America. The bridge will be moved 55 feet laterally onto refurbished piers and the new 40-foot-wide bridge includes two 12-foot lanes and 8-foot shoulders -- twice as wide as the original bridge. The slide of the 2,428-foot truss (nearly a half mile) will be historic. The bridge will be moved by hydraulic jacks, each one of them about two feet in diameter. These jacks will be moving the bridge about 20 inches per pull, and the bridge will be moved a total of 55 feet to reach its final destination. Because there will be many stops along the way, the process will take most of the day. Once the slide is complete, it will take up to a week to complete the road connections to the bridge.

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