There’s nothing better than a big glass of water filled with ice on a hot summer day. Concrete may feel the same way, also.
Weather is one of the most important factors during any concrete placement and when placed in hot weather, quality can be greatly diminished if the proper precautions are not taken. The Portland Cement Association estimates that, for every 20 degrees Fahrenheit of increased ambient temperature, the curing time of concrete can be reduced by as much as half. This decreased amount of work-ability time can put stress on a crew to complete the finishing work before it hardens and increase the risk of cracking. The PCA also suggests that steps be taken to reduce hot weather effects when ambient temperatures rise above 77 degrees Fahrenheit and especially after temperatures reach 90 degrees.
One way crews are keeping the temperature of their concrete cooler on hot days is to use ice. In fact, construction crews are using so much ice in Charlotte, North Carolina, that it’s becoming local business Zippy Ice’s fastest growing sector, as well as their highest source of revenue, according to a TWC News story. The ice they produce is 22 degrees, which is sure to be able to bring the temperature of a concrete mix down to more manageable levels. Before dropping chucks of ice into your mix, however, it’s worth noting that ASTM C1602 requires that ice be completely melted by the time mixing is complete. Depending on the amount of ice used and the ambient temperature, it may be better to purchase larger or smaller pieces of ice, or wait until it’s melted before adding it to the mixer. You should also enlist the help of an engineer to help you determine the amount of ice needed.
Concrete is an extremely strong building material, but has a notoriously weak tensile strength. In order to resist tension, bending, and shear forces, steel rebar or other reinforcement materials are added either prior to the placement or into the mix. Even with reinforcement, concrete is still extremely rigid and prone to cracking. In the event of a major earthquake, the uneven and horizontal forces can cause structures to crack and, in the worst case, cause failure.
Construction Safety is talked about constantly. There are many construction companies that take it very seriously. There are also many that don’t. All will say it’s their top priority.
So what can a city do that’s facing regular worker deaths and increases in workplace injuries? New York City has decided to require extensive safety training for all of the 185,000 construction workers in the city.
[sponsored] With the hottest of the summer months behind us, we are moving into the cooler months of autumn on the jobsite. While Helly Hansen is frequently seen on snowy slopes and high seas, their tradition of quality and protection actually originated in premium workwear.
Modular building makes a lot of sense: build repetitive structures in a controlled, factory-like setting and transport to the project site and assemble. It should be a more efficient and less expensive way to construct a building, but the truth is, it’s a lot harder than it looks. There’s also no written standard for doing it.
Masonry workers, specifically brick and block masons, have been around for centuries and are one of the construction industries oldest professions. Before blocks were prefabricated and purchased, masons had to cut the material by hand before placing. Recently, robotic brick and block placing robots have threatened to take some jobs away from human masons, but that technology is still a long way away from making a huge impact on the profession
Concrete can adapt to any shape its formwork calls for while it’s being placed. While it’s POSSIBLE to make intricate designs with the material, it’s not always easy or practical to do so. Researchers from ETH Zurich have designed a new method of forming and placing an ultra-thin, curved concrete roof system that they plan on installing on a construction project next year.
According to the Workzonesafety.com, nearly half (46%) of all work zone-associated worker fatalities from 2003-2010 were caused by being struck by a vehicle. Surprisingly, only around 2% of those workers were killed by a drunk driver. From 2003 to 2015 (the last year this data was updated), a total of 1324 work zone fatalities have been recorded, which averages to about 102 per year.
Residents living near a Jersey City, New Jersey construction site were frightened as they watched “explosions” of smoke coming out of holes in the ground.
For almost 80 years, the Old Kosciuszko Bridge connected Brooklyn and Queens in New York. Much like many other bridges its age, it is being replaced due to capacity issues and deterioration. When it was completed in 1939, it was built for 10,000 cars per day. Unfortunately for the people who needed to use that bridge that past few decades, around 180,000 cars used it.
The immense technological growth the construction industry has seen in the past decade has been a refreshing change, to say the least. Fax machines, large filing cabinets, and redundant work are slowly becoming a thing of the past. More importantly, software developers are actually paying attention to the construction industry, making our lives collectively easier, while giving us more data to make better decisions. Bluebeam, maker of one of the industry’s favorite construction document software, has recently announced a wireless digital sensor specifically for under construction buildings.