| http://www.w3.org/ns/prov#value | - The binder is similar to the binder described in the third embodiment. [0173] a) Firstly, 10 to 30 kg of cement, 0.5 to 1.5 kg of sodium carbonate, 5 to 15 kg of kaolin, 0.5 to 2 kg of amorphous silica, 0.3 to 2 kg of methylcellulose, 2 to 3 kg of casein, and 10 to 15 kg of perlite are put in a first mixing tank or other vessel and mixed together as the first powder.
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