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HAC returns to prove its mettle.High Alumina Cement (HAC), also known as 'fondu concrete', was invented in 1908 in the laboratories of French cement manufacturer Pavin de Lafarge.

It started crossing the Channel in bulk in the 1960s when the frantic pace of construction in those booming days made its rapid hardening and early strength seem like the answer to contractors' dreams.Soon Lafarge was selling 30,000 tonnes a year and two thirds of this were going into pre-stressed concrete beams.In 1973 disaster struck. Pre-stressed beams in three different buildings collapsed. HAC was taken off the market with its failure blamed on a process known as conversion.However, ...

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