Origin and Manufacturing of Volcanic Glass Powder
By A. Tomoyose, T. Noguchi, K. Sodeyama and K. Higashi
Concrete Journal, Vol.58, No.10, Oct. 2020
- Synopsis
- While most volcanic deposits are known to be reactive, volcanic glass powder is defined in JIS A 6209 as "fine powder consisting mainly of silicate glass (volcanic glass) produced from volcanic ejecta by sorting, grading, milling, etc." When Ito pyroclastic flow deposits in Southern Kyushu are used as the raw material, JIS-compliant mineral admixtures can be manufactured by dry classification based on particle size and density. With a view to the production of volcanic glass powder from volcanic ejecta from all over Japan, we rated the effectiveness of dry classification from the viewpoints of volcanic eruption and deposition, as well as the physical properties and weathering of volcanic glass, and showed the possibility of producing volcanic glass powder from volcanic ejecta in each region in the same manner.
- Keywords:
- Volcanic glass powder, Pozzolan, Dry classification, Volcanic ejecta
