黑曜岩又名火山玻璃,是一种黑色的玻璃质火山岩。由于黑曜岩的岩石性质与玄武岩、珍珠岩和沸石十分相似,所以同样具有活性,因此它可广泛地用作水泥混合材料,以代替矿渣或炉渣。当掺合量达到10％时,能改善水泥稳定性,提高抗折强度,缩短水泥初凝和终凝的间隔,降低成本,即每吨混合材料可降低10多元。使用这种混合材还能使水泥的颜色变深,玻璃光泽增强。 美国还使用黑曜石建房。如在黄石国家公园附近的一个小区,就是采用黑曜岩来来建造房屋的。 此外,还可采用黑曜岩制作观赏石以及填料 Obsidian rock, also known as volcanic glass, is a kind of black vitreous volcanic rock. Since the rock properties of obsidian rock are very similar to that of basalt, perlite, and zeolite, it is also active, so it can be widely used as a cement mixing material instead of slag or slag. When the blending amount reaches 10%, the stability of the cement can be improved, the flexural strength can be improved, the interval between the initial setting and the final setting of the cement can be shortened, and the cost can be reduced, that is, the composite material can be reduced by more than 10 yuan per ton. The use of this kind of admixture can also make the color of the cement darker and enhance the gloss of the glass. The United States also uses obsidian to build houses. For example, in a neighborhood near Yellowstone National Park, black rock is used to build houses. In addition, obsidian rock can also be used to make ornamental stones and fillers