硅灰是冶炼硅铁和硅金属时的副产品,其主要成份是活性二氧化硅,颗粒极小,活性很高。将硅灰摻人混凝土中,可以节约水泥,提高强度.而且还能带来其它一系列好处。硬化硅灰混凝土有如下特性: 1.水泥石微孔结构:硅灰水泥石的全孔隙率与普通水泥石大致相同。但电镜观察发现,硅灰水泥石中大都是超细微孔,几乎没有普通水泥石的粗大孔隙,从而可明显提高混凝土的抗渗性和其它力学性能。 2、抗压强度:未掺硅灰混凝土28天抗压强度为50MPa,摻硅灰8％时,强度达70MPa,掺16％时达到80MPa。抗拉与抗弯强度也随硅灰掺量而直线提高。 3.弹模:弹性模量随着抗压强度提高而增大,相关性 Silica fume is a byproduct when smelting ferrosilicon and silicon metal, the main component is activated silica, the particle is very small, the activity is very high. Adding silica fume to concrete can save cement and increase strength, but it offers a host of other benefits. The hardened silica fume concrete has the following characteristics: 1. Cement stone micro-pore structure: Silica fume cement full porosity is almost the same as ordinary cement stone. However, electron microscopy showed that silica fume mostly in the ultra-fine pores, almost no ordinary cement coarse pores, which can significantly improve the impermeability of concrete and other mechanical properties. 2, compressive strength: non-silica fume concrete compressive strength of 28 days 28MPa, silica fume 8%, the strength of 70MPa, doped 16% reached 80MPa. Tensile and flexural strength also increases linearly with the silica fume content. 3. Elastic modulus: elastic modulus increases with increasing compressive strength, correlation