论述了天然火山灰用作混凝土掺合料的矿物组成、物化性能；火山灰活性及其评定。
This paper expounds mineral composition, physical and chemical characteristics, activity and its evaluation of natural volcanic ash which is used as concrete admixture.
室内完成暴露混凝土，黑色染色胶合板门和面板，白色的墙壁和天花板画，天然火山灰。
Interior finishes are exposed concrete, black stained plywood doors and panels, white painted walls and ceilings, natural ash.
巨大的火山灰烟霭含有大量的二氧化硅- - - - -一种跟着这种类型的火山爆发而来的天然成分。
The enormous dust cloud may contain large amounts of silica, a natural component of rock that comes with these types of volcanic explosions.
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