北海道産火山灰の加熱発泡体原料としての適性について
1982 年 98 巻 1137 号 p. 1117-1122
詳細
1982 年 98 巻 1137 号 p. 1117-1122
Hokkaido is dominated by various kinds of volcanic ash such as pumice flow and vitric tuff which are similar to shirasu in the southern Kyushu. Some characteristics of these raw materials and samples prepared by sieving, were investigated. The bloated particles were tried to be produced from these samples by heat treatment, their physical properties were measured and roughly estimated from the characteristics of raw materials. All the samples prepared could be used as raw materials of the bloated particles.
The results obtained are summerized:
(1) Because of high yield and good properties of the bloated particles, the following volcanic ash were useful as a good raw material of the bloated particles; two kinds of pumice flow in Minami-ku Sapporo-shi and Suenaga Date-shi, and two kinds of vitric tuff in Ikeda-machi and Makubetsu-machi Nakagawa-gun.
(2) The values of the expanding ratio and the yield of the bloated particles have some correlations with the physical properties of raw material, such as the values of the bulk density, the apparent density, volcanic glass content and weight loss of 600°C to 1000°C on thermal gravity at 20°C/min of the samples prepared, and could be estimated by the linear equation calculated by least square method.
(3) The values of the bulk density, the apparent density and hydrostatic strength of the bloated particles could also be presumed by the physical properties of raw material mentioned above.
