Construction | Homeland Security Newswire

  • Purdue engineers test effects of fire on steel structures

    Building fires may reach temperatures of 1,000 degrees Celsius, or more than 1,800 degrees Fahrenheit; at that temperature, exposed steel would take about twenty-five minutes to lose about 60 percent of its strength and stiffness; Purdue researchers experiment with ways to make steel more fire-resistant

  • GWU earthquake simulator helps engineering prepare for the real thing

    George Washington University laboratory’s “shake table” — a $1 million, 10-by-10-foot metal structure that moves in six directions — replicates earthquakes and allows engineering students to test construction materials to see how they hold up under tremors of varying strength

  • New Orleans levee committee uneasy with Corps of Engineers modeling

    The Army Corps of Engineers uses complex computer models for hazard analysis calculations on which billions of dollars worth of repairs and improvements to the federal hurricane levee system are being based; the members of the regional levee commission want their own expert to scrutinize these computer models

  • U.K.'s government unveils £200 billion National Infrastructure Plan

    David Cameron announces infrastructure plan to rebuild the economy a week after sweeping government cuts; the plan calls for a government commitment of over £40 billion directed to infrastructure projects, including a Green Investment Bank that provides up to £1 billion toward a commercial scale carbon capture and storage demonstration projects; £30 billion for transportation, including a high speed rail network, maintenance, and investment in local roads and rail and funding towards the Network Rail

  • Smog-eating concrete for Missouri highways

    Missouri highway is paved with smog-eating concrete; the concrete contains an active ingredient that captures pollution and UV light from the sun breaks it down into harmless chemicals

  • New technology weighs trucks while trucks are in motion

    Israeli researchers develop a method to detect overloaded trucks quickly and efficiently — while the trucks are in motion; the system, which has potential for use in law enforcement, infrastructure maintenance monitoring, and road and bridge design and planning

  • U.K. railways threatened by changes in rainfall patterns

    Some of the U.K.’s railway infrastructure was built in the nineteenth century on unprepared foundations, before engineers understood soil mechanics; rail embankments are structures made of soil and rock, which are always be affected by climate — particularly rainfall patterns

  • High performance materials for the tunnel of the century

    On 15 October Swiss engineers finished their work on the Gotthard Tunnel — longest rail tunnel in the world; the 57-km (35.4-mile) high-speed rail link, which will open in 2017, will form the lynchpin of a new rail network between northern and southeastern Europe and help ease congestion and pollution in the Swiss Alps

  • America's latest wonder: Hoover Dam companion bridge

    After the 9/11 terrorist attacks, the U.S. feared a terrorist with a truck bomb could attack the Hoover Dam, potentially flooding vast areas and disrupting water and power supplies to several states; semi-trucks were banned from bridge, forced to take route to Las Vegas that is more than forty miles longer; new 1,900-foot-long structure will reroutes traffic off of the two-lane road atop the dam, will improve traffic in the region, and help protect the dam from terrorist threats; it is the seventh highest bridge in the world and it is held up by the longest arch in the Western Hemisphere

  • NIST data enabling evacuation planning of high-rise buildings

    NIST researchers made video recordings of evacuation drills in stairwells at nine buildings ranging in height from six to sixty-two stories tall; the drills are part of a wide-ranging study to track the movement of people on stairs during high-rise building evacuation; the data sets created will ensure that architects, engineers, emergency planners, and others involved in building design have a strong technical basis for safer, more cost-effective building evacuations

  • Curved escalators can follow any path upward

    A retired British mechanical engineering professor designed an escalator, or conveyance — dubbed the Levytator — that can be designed into any shape, so architects can incorporate escalators that follow curves rather than travel in straight lines; the Levytator moves a continuous loop of curved steps, which can follow any path upwards, flatten, and straighten, and descend again with passengers onboard

  • Bridge column withstands 6.9 quake in tests

    Engineers in California test a bridge column design capable of withstanding a 6.9 quake; nearly all of California’s 2,194 state-owned bridges have been retrofitted better to withstand tremors; local cities and counties across California own 1,193 with work done on 729 of them

  • Using bacteria to create self-healing concrete

    Cement production has an impact on the environment as it is very energy intensive, accounting for about 7 percent of the total anthropogenic atmospheric CO2 emissions; in addition to the energy consumption from production and transportation, air pollution, as well as land use and impacts on the landscape from related mining activities are also matters of concern; means of increasing the service life of concrete structures would make the material not only more durable, but also more sustainable — and researchers find that embedding certain bacteria in the concrete promises to do just that

  • The world's longest tunnel to open 15 October

    At 57 kilometers, the Gotthard tunnel, connecting Zurich and Milan, will be the world’s longest tunnel; constructing the tunnel, which opens on 15 October, required the excavation of m an estimated 24 million tons of rock at a cost of $9.5 billion

  • New cement absorbs CO2

    Concrete — the essential material used by the world’s $3.8 trillion construction industry — accounts for 5 percent of the world’s man-made carbon dioxide emissions; each ton of cement emits about 800 kg (1,763 lb.) of CO2 during manufacture — and every year, some 3 billion tons of cement turn into nearly 30 billion tons of concrete, a British start-up has devised a new cement — based on magnesium silicates rather than limestone — that absorbs and stores CO2 when it is produced