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INFRASTRUCTURES * USA - Self-healing Concrete for Safer, More Durable Infrastructure
MICH,USA - Science Daily -24 April 2009: -- University of Michigan researchers have developed a new self-healing concrete that can repair its own cracks without human intervention, using only naturally occurring water and carbon dioxide... A few rainy days could mend a damaged bridge using this kind of concrete, called Engineered Cement Composite (ECC), which is made to bend and crack in narrow hairlines. Victor Li's, the E. Benjamin Wylie Collegiate Professor of Civil Engineering and a professor of Materials Science and Engineering said, researchers found that self-healed specimens were able to get back most or all of their original strength after being subjected to a 3 percent tensile strain, enough to cause catastrophic breakage in traditional concrete... The research team has been working for 15 years to develop ECC, which is flexible and studded with reinforcing fibers that make it behave more like a metal than a traditional concrete... (Photo Credit: Nicole Casal Moore - Self-healing concrete works because it can bend. When it's strained, many microcracks form instead of one large crack that causes it to fail. Here, a specimen is bending as a force of five percent tensile strain is being applied. Regular concrete would fail at .01 percent tensile strain)Labels: infrastructures
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