Construction

  • InfrastructureAsh from olive residue biomass leads to more effective, cheaper concrete

    Researchers have produced self-compacting concrete with ash from boiler combustion of olive pruning residue pellets. The plasticity and cohesion of this type of concrete mean no compaction is needed when used in construction and, moreover, it has other advantages with respect to conventional concrete.

  • InfrastructureMaking concrete “greener”

    Many factors determine the overall energy and environmental impact of concrete. Reducing the amount of portland cement, which reacts with water to bind all the sand, stone, and the other constituents of concrete as it hardens, provides the biggest opportunity. Portland cement manufacturing accounts for more than 5 percent of U.S. industrial carbon-dioxide emissions. In addition, the U.S. cement industry consumes 400 gigajoules of energy annually.

  • InfrastructureU.S. infrastructure grade raised from D to a D+, but problems loom

    The American Society of Civil Engineers (ASCE), in its just-released 2013 Report Card for America’s Infrastructure, gave the U.S. infrastructure an overall grade of D+, showing slight progress from the D in the last Report Card issued in 2009. The Report Card concludes that to raise the grades and get U.S. infrastructure to an acceptable level, a total investment of $3.6 trillion is needed by 2020. Currently, only about $2 trillion in infrastructure spending is projected, leaving a shortfall of approximately $1.6 trillion.

  • InfrastructureAmerica’s outdated waterways, ports hurting economy

    Underinvestment in America’s inland waterways cost American businesses approximately $33 billion in 2010. Without a significant increase in investment, that number could increase to $49 billion by 2020. If improvements are not made, 80 percent of American locks will be functionally obsolete by 2020. The extended failure of just one lock can cost agriculture exporters up to $45 million and barge operators as much as $163 million.

  • InfrastructureImproving high-speed rail ties against freezing, thawing conditions

    Research project is helping high-speed rail systems handle the stress of freezing and thawing weather conditions; the 3-year study looks at the freeze-thaw durability of concrete railroad ties; the research is essential to developing safe and durable high-speed rail systems

  • Safety glassSafety glass – cut to any shape

    If an object slams into the glass façade of a high-rise building, the glass must not shatter and fall down, because it could harm pedestrians below; in addition, the window panes must hold if a person were to fall against it from the inside; architects and builders must therefore use something stronger than laminated safety glass on the façades of high rise buildings; scientists develop a method which offers more flexibility with the design and handling of safety glass

  • Infrastructure protectionRehabilitating historical structures using laser scanning technology

    The Carmel Mission Basilica in California is undergoing a restoration using cutting-edge laser scanning technology; earlier this year, engineers the from Blach Construction Company  teamed up with CyArk, a non-profit foundation that digitally preserves historical sites, to shoot laser beams at and within the basilica to create precise digital maps of the building from different angles

  • InfrastructureExperts trying to determine cause of a giant Louisiana sinkhole

    The earth near Bayou Corne, Louisiana opened on 2 August: a 300-foot-wide sinkhole, with depth varying between 50 and 300 feet, suddenly opened up in an area, and the authorities have been trying to determine whether the sinkhole was caused by the collapse of an abandoned brine mining cavern along the margin of the Napoleonville Salt Dome or by something else

  • MaterialsMicrostructural improvements enhance material properties

    DARPA merges structural engineering principles with new fabrication technologies to demonstrate microstructural control of materials at the micron level; the ultimate objective of the agency’s Materials with Controlled Microstructural Architecture (MCMA) program is to be able to develop materials in the future with properties tailored to meet specific mission requirements

  • InfrastructureDecline and fall: all built structures are destined to break down or fail

    A series of infrastructure-related accidents in Ontario this summer has caused people to ask: Just how safe are the structures that we build? The answer a materials science and engineering professor offers may not be reassuring: “Nature always looks for ways to use energy in a favorable state — gravity always pushing things downwards is an example. Any built structure naturally goes against nature. Therefore, all structures will eventually be broken or destroyed — given the right amount of time, they will break down or fail.”

  • InfrastructureAerospace materials for on-site building of pipes of infinite length

    Concrete and steel pipes are built in short sections to fit on standard 18-wheel trucks; the heavy industrial manufacturing processes, long-distance trucking, and leak-prone joints used in steel and concrete pipe construction exact a heavy toll on the environment, not to mention bottom line; the solution: a new pipe design, consisting of a central layer of lightweight plastic honeycomb, which can be built onsite as a single section of virtually infinite length

  • Infrastructure protectionNew method for detecting, measuring bridge damage

    Researchers have created a bridge health index, which is a rating system that more accurately describes the amount of damage in a bridge; the health index can extend beyond bridges and apply to other structures, such as gas pipelines, dams, buildings, and airplanes

  • Infrastructure protectionAutomated pavement crack detection and sealing system to extend roadways life

    Researchers from the Georgia Tech Research Institute developed a prototype automated pavement crack detection and sealing system; in road tests, the system was able to detect cracks smaller than one-eighth-inch wide and efficiently fill cracks from a vehicle moving at a speed of three miles per hour

  • Infrastructure disasterQuick-curing concrete for infrastructure, mining disaster recovery

    A quick-curing concrete can be sprayed to reinforce structures — buildings, runways, tunnels, bridges, dams – damaged by an act of terror or natural disaster; the spraying can be done almost immediately, before the structure fails catastrophically, providing safety for rescue workers who risk their lives minutes after disasters hit, and for still stranded in or near the damaged structure

  • Infrastructure protectionHurricane Ike damage analysis point to vulnerable Texas bridges

    Preliminary results from a new research show more than a dozen Gulf Coast bridges on or near Galveston Island would likely suffer severe damage if subjected to a hurricane with a similar landfall as Hurricane Ike but with 30 percent stronger winds