高铝粉煤灰蒸压制品强度的研究

利用X射线衍射、扫描电镜、红外光谱对高铝粉煤灰进行了分析,在不同蒸压制度下通过未反应CH量的测定、结合水量的测定、冷热盐酸中溶出量的变化以及XRD、SEM等方法对该粉煤灰的蒸压性能进行了研究。结果表明,该粉煤灰的主要矿物组成为刚玉、莫来石、赤铁矿和少量玻璃相,不含二氧化硅。在不同蒸压制度下,该粉煤灰石灰蒸压试样中水化产物主要为C-S-H(I)和水石榴石,水石榴石的量较多,蒸压试样的强度很低,其原因与粉煤灰中可参与反应的硅的量少有关。

Compressive Strength of Autoclaved High-volume-aluminum Fly Ash Product

High Al fly ash was analyzed by using X-ray diffraction(XRD),scanning electron microscope(SEM),infrared spectrum(IR),and autoclaved performance of fly ash was studied by using bound water,acid soluble amount,XRD and SEM.The result shows that mineral composition of the high Al fly ash has corundum,mullite,hematite and glass phase without quartz.In different autoclaved conditions,the hydrate of high Al fly ash lime autoclaved system has C-S-H(I) and hydrogarnet,and hydrogarnet amount is large.The compressive strength of the autoclaved product is lower because of lower Si reacted in the high Al fly ash.