Lighthouse says: "Steel is the material of choice for high rises in any case".
Wiki says: "The primary structural system of Burj Khalifa (world's tallest building) is reinforced concrete. Over 45,000 m3 (58,900 cu yd) of concrete, weighing more than 110,000 tonnes (120,000 ST; 110,000 LT) were used to construct the concrete and steel foundation..In May 2008 concrete was pumped to a then world record delivery height of 606 m...Special mixes of concrete are made to withstand the extreme pressures of the massive building weight; as is typical with reinforced concrete construction, each batch of concrete used was tested to ensure it could withstand certain pressures. "
A 100% cost premium on concrete would be acceptable in such applications (buildings, bridges etc) as savings in transport/pumping costs and construction benefits would be more significant.
Problem is that the market for this concrete might be limited relative to future availability of nanocarbons. Success will depend on securing some specific patents, which might prove difficult.
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