Submitted by: The Solar Freedom Group
Implemented country: United States
Title: The “Positherm” Project

The use of cement has served mankind since antiquity. The Chinese employed a cementious mortar to construct in part the Great Wall of China. The Roman Empire was established in most of Europe and North Africa. Vestiges of that culture and engineering skills are still seen today in aqueducts that are still standing after 2000 years. The Parthenon in Rome spans 43 m (142 ft). It is still standing, held together by an ash based cement. The Romans were able to build bridges since their cement would harden in water. In 1823, Portland cement was invented, the basis for our modern world today. A revolutionary form of a LEED rated cement with inestimable benefits is the subject of the following entry.



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