利用活化粉煤灰制备高掺量粉煤灰烧结砖

研究了分别经机械和化学活化后的粉煤灰对高掺量粉煤灰烧结砖性能和显微结构的影响。结果表明:用磨细粉煤灰代替原灰配料,可以改善烧结砖的力学性能,尤其是砖的抗压强度能显著提高。当用掺量质量分数为60%的磨细灰制砖时,烧结砖的抗压强度提高至原灰烧结砖的2倍,并且有更为致密的微结构。在粉煤灰砖中加入质量分数为2%的外加剂D进行化学活化后,可明显改善干坯强度,并提高烧结砖的抗压强度。

Development of high content fly ash fired brick by chemical and mechanical activation

Effect of the mechanical and chemical activation of fly ash on the properties of high content fly ash fired brick was studied. The results showed that the physical properties of the fired brick, especially the compressive strength, were improved by the replacement of raw fly ash with ground fly ash. The compressive strength of fired brick made from ground fly ash was 2 times of that made from raw fly ash, when fly-ash content was 60%. Results also showed that compressive strength of both the unfired and fired brick were increased when 2% activator D was added.