粉煤灰蒸压制品中长石的激发机理

ACTIVITY MECHANISM OF FELDSPAR FOR AUTOCLAVED FLY ASH PRODUCTS

将几种长石矿物掺入粉煤灰中,用X射线衍射分析、扫描电镜以及原子吸收分光光度计等测试方法研究了粉煤灰蒸压制品中长石的激发效果,测定了蒸压制品的强度。结果表明:在蒸压(1.2MPa)条件下,长石和NaOH一样可以激发粉煤灰,但激发方式和效果不同。长石中碱金属离子缓慢释放,其不断激发的方式更有利于托贝莫来石的形成,有利于提高粉煤灰蒸压制品的强度。钠长石对粉煤灰蒸压制品的激发效果优于钾长石。

The effects of different feldspars on autoclaved fly ash products were investigated using X-ray diffraction, scanning electron microscopy and atomic absorption spectrophotometry by admixing feldspars into fly ash. The experiments show that feldspars can activate fly ash in 1.2 MPa saturated steam pressure as NaOH, however, their activating modes and effects are different. The alkali cations are released slowly from feldspars during autoclaving and activate fly ash continuously. This is favorable for the formation of tobermorite in the autoclaved products and for increasing the compressive strength of the products. The effect of albite on activating fly ash is better than microcline ＇s.