• Concrete recycling robot disassembles concrete structures for recycling, reuse

    Current concrete-demolition techniques require a lot of power crushing, separation, and machinery, not to mention the fact that they waste a lot of water in order to prevent dust blooms during operation. A new concrete recycling robot is designed efficiently to disassemble concrete structures without any waste, dust, or separation and enable reclaimed building materials to be reused for new prefabricated concrete buildings. It does so by using a water jet to crack the concrete surface, separate the waste, and package the cleaned, dust-free material.

  • Earthquake-proofing precast buildings

    Precast or ready-made building structures offer a number of advantages when compared to more traditional construction techniques in terms of time and cost savings. The vulnerability of joints and connections between assembled precast elements, however, is widely recognized as a potential safety issue, especially in earthquake-prone areas. An EU-funded project has set out to develop new procedures and guidelines for designing precast structure joints and connections that can stand up to seismic forces.

  • U California, Berkeley students win National Student Steel Bridge Competition

    The weekend of 31 May residents of Washington State watched as engineers began erecting a temporary steel bridge over the Skagit River, to replace the 160-foot span of a 4-lane bridge that had collapsed a week earlier, after being struck by an over-height truck. Just sixty miles away, on the campus of the University of Washington in Seattle, 620 civil engineering students erected their own temporary steel bridges in a competition to demonstrate their engineering skills. For the second consecutive year and for the second time in the past seven years, a team of students from the University of California, Berkeley captured the title as champions of the ASCE/AISC National Student Steel Bridge Competition (NSSBC).

  • Ash 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.

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  • Making 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.

  • U.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.

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  • America’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.

  • Improving 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 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

  • Rehabilitating 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

  • Experts 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

  • Microstructural 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

  • Decline 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.”

  • Aerospace 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

  • New 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