is built on concrete and steel. Put the two together, though, and you can generate a problem. Reinforcing concrete with steel rods called rebars is the basis of modern construction. But because water gets in through tiny cracks, the rebars rust. This causes them to expand, widening the cracks and weakening the concrete. Hence such structures require constant attention and often have design lives of only 60-100 years.
According to Mahbube Subhani, one of the researchers at Deakin, a three-metre-long version of such a section has just been tested and has passed local building codes. The group is now pressing ahead with the first of the ten-metre sections needed to construct the bridges themselves. They will also be more environmentally friendly, for the concrete surrounding the skeleton is unconventional, too. Normal concrete is bound with Portland cement, which is made by roasting a mixture that includes limestone . This process drives off carbon dioxide, a greenhouse gas, and cement-making is a big source of such emissions.
A very lovely sun dial if you’re looking for it...your turn...
JuanJAmado 👀
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