锰铁合金渣具有潜在的水硬性和火山灰性，可用作混凝土掺合料和水泥混合材料。
Ferromanganese slag has the latent hydraulicity and volcanic ash, it can be used to build concrete admixtures and cement.
此外，高火山灰性(凝硬性)灰可以通过控制燃烧来产生，此时，二氧化硅保持在非结晶形式和蜂窝状结构。
In addition, highly pozzolanic ash can be produced by means of controlled combustion, when silica is kept in non-crystalline form and cellular structure.
至于气温突降的原因，最具代表性的观点认为是由于天体冲撞或大规模火山喷发激起的火山灰和尘土。
As to what caused these cold snaps, the ever-popular suspects are ash and dust kicked up by either astronomical impacts or massive volcanism.
当厚厚的岩浆和气体大量在地表下聚集起来，就会出现爆炸性喷发，将熔岩，岩石和火山灰喷向空中。
When thick magma and large amounts of gas build up under the surface, eruptions can be explosive, expelling lava, rocks and ash into the air.
默拉皮火山似乎不可能爆发到这种程度，但是它能够带来危险性极强的火山灰流。
Merapi seems unlikely to explode on anything like this scale, but it has brought the risk of pyroclastic flows.
一些云分析师正在考虑使用事实情况：不同于放射性尘埃，火山灰可在远处被观测到，从而做出更好的结论。
Some cloud modellers are considering using the fact that ash, unlike fallout, can be seen from afar to make better calculations.
这些火山灰中含有锆石等矿物，这些矿物中的某些组分允许进行精确的放射性测年(以确定精确的年代数据)。
The ash contains minerals such as zircon that can be dated precisely from the radioactive decay of some of their components.
进行此类研究的实际原因在于火山灰带电性将对飞机无线电通讯造成干扰。
The practical reason for understanding the electrical nature of ash plumes is that they can interfere with aircraft radio communication.
对保存在火山灰中的人类足迹进行年代测定后，一个科学家小组得出了这一具有争议性的结论。这些火山灰是在墨西哥一个废弃的采石场被发现的。
A team of scientists came to this controversial conclusion by dating human footprints preserved by volcanic ash in an abandoned quarry in Mexico.
在混凝土外加剂的共同作用下，KGF粉可以很好地发挥火山灰效应、微集料填充效应和耐久性效应。
The test results show that by the joint action with the concrete admixture, the pozzolanic, micro-aggregate filling and durable effects of KGF powder can be realized properly.
在混凝土外加剂的共同作用下，KGF粉可以很好地发挥火山灰效应、微集料填充效应和耐久性效应。
The test results show that by the joint action with the concrete admixture, the pozzolanic, micro-aggregate filling and durable effects of KGF powder can be realized properly.
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