The workers build the Great Wall of the Ming Dynasty era, about 600 years ago by mixing glutinous rice flour with chalk, as the standard material mixture of adhesive, said Dr. Zhang Bingjian.
Glutinous mixture of bricks so tightly bind many weeds can not grow. However, rejection occurs widely in southern China against construction of the Wall as Emperor Ming asked for sticky rice harvest in the south for food and as a mixture of cement workers.
'The mixture of these ancient cement adhesive, consisting of a special kind of mixture of organic and inorganic,' said Dr. Zhang, an expert in chemistry from Zhejiang University, Hangzhou city, east China, as reported by the Telegraph.
'organic component, amylopectin, is derived from glutinous rice porridge that is added to the mixture of cement,' he added.
'inorganic component is calcium carbonate and organic components are derived from glutinous rice amylopectin. Amylopectin help create dense microstructure, making the Great Wall is more stable and have greater mechanical strength, 'according to a report in the journal of the American Chemical Society.
Dr. Zhang said the use of sticky rice, the staple food of East Asia, is one of the biggest technical innovation at the time, which helps various tombs, pagodas and walls in the era of the Ming Dynasty from the blow of the weather, earthquakes and other natural disasters.
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