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Author Topic: Sticky Rice and Great Wall of China  (Read 1755 times)

Offline Kudrat Kaur

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Sticky Rice and Great Wall of China
« on: August 31, 2010, 06:42:33 PM »
The secret of the strength and longevity of the Great Wall of China lies in the sticky rice that was used as its mortar.


The sticky rice mortar bound the bricks together so tightly that in many places weeds still cannot grow. However, there was widespread resentment against the Wall in the south of China because the Ming emperors requisitioned the southern rice harvest both to feed the workers on the Wall and to make the mortar.

"The inorganic component is calcium carbonate, and the organic component is amylopectin, which comes from the sticky rice soup added to the mortar. This amylopectin helped create a compact microstructure, [giving the Great Wall] more stable physical properties and greater mechanical strength," he reported in the journal of the American Chemical Society.
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