A cracking alternative to cement
Alternative cement products make good environmental sense, writes Sean Dodson, especially if Britain is to meet its ambitious targets to reduce carbon dioxide emissions
Thursday May 11, 2006
The Guardian
In 1824 an English bricklayer named Joseph Aspdin rediscovered one of the great secrets of the ancient world. Burning limestone and clay together at an incredible heat – more than 2,700 degrees fahrenheit – made the two minerals fuse together. Once cooled and ground into a fine ash, the resulting substance would, after mixing with water, set as hard as the Portland stone that gave it its name. And while his invention, portland cement, is seldom celebrated in the same breath as steam power or the spinning jenny or even the mass introduction of soap, it too – literally – laid a cornerstone of the modern industrial world.
Beloved of master builders, detested by their labourers and used by the Romans, cement supports the very ground beneath your feet and keeps the roof from crashing in; yet few outside the building trade spare the back-breaking bringer of toil much thought. read more
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