The invention method of producing lightweight aggregate according to the present invention relates to a lightweight aggregate material and a manufacturing method having a foam cell of the second is a) a sodium silicate liquid nSiO 2 · Na 2 O · xH 2 O (n is from 3 to 4 .) and by addition of the clay, waste concrete minutes or functionality of one or more is selected from ceramics powder to prepare a functional hwasu; b) to dry the produced functional water glass to prepare a functional hwasu and pulverizing the prepared functional hwasu; And c) mixed with the pulverized functional hwasu reference to the milled either individually or in combination of two or more thereof and boron oxide, of one or more is selected from boric acid or borax powder is selected from calcium oxide, calcium hydroxide or cement functional hwasu step of granulation; d) firing at a low temperature and characterized the step of stabilization at a high temperature, and the aspect of the different manufacturing method a) sodium silicate liquid nSiO 2 · Na 2 O · xH 2 O (n is from 3 to 4), boron oxide, boric acid or borax powder to 20 to 30% by weight calcium, a liquid or two or more mixture selected from calcium oxide or cement pulverized to prepare a slurry; b) sodium silicate liquid nSiO 2 · Na 2 O · xH 2 O (n is from 3 to 4) and the clay, waste concrete minutes or functional manufactured by one or a mixture and wherein the step a) of two or more selected from ceramics powder mixing to produce a functional hwasu a slurry; c) by drying the produced water glass to prepare a functional particles; d) characterized by the step of foaming and stabilizing the dried particles. As a lightweight aggregate in accordance with the present invention has a pore structure of the foam pore structure 2 with low water absorption and thermal conductivity, a high strength advantages.
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