4. Analysis
The fly ash retrieval was put from the factory located in the village of Trangkil, Pati, Central Java Province, Indonesia. The fly ash was taken from burning of bagasse itself, which is very much a waste by production processof the sugar factory. The Sand used in this research was the sand resulted from volcanic material of Mount Merapi in Magelang region, known as Muntilan sand. The choice of Muntilan sand is based on the excellent quality of the construction material. In addtion, the material is also very abundant in the area after the eruption of Merapi, one of
the active volcanic mountain in Central Java Province, Indonesia, in 2010; it is the other benefit of this material. The Styrofoam used in this study was firstly processed by using styrofoam waste shredder (crusher foam). The bagasse ash was grinded by using High Energy Milling in order to produce silica nano-particles.