摘要
微波辐照活化在提高粉煤灰的活性方面具有一些独特的优点,是一种速度快、能耗低、低碳的活性激发技术。本文研究了微波辐照功率(500 W、800 W、1000 W)对粉煤灰活性的影响,采用X射线衍射分析(XRD)、扫描电子显微分析(SEM-BSE)方法对其微观结构进行表征,并研究活性粉煤灰对水泥水化的影响机理。结果表明:微波辐照能够提升粉煤灰的潜在活性,最佳微波辐照功率为1000 W,28 d的活性指数为80.89%。经过微波辐照后的粉煤灰颗粒发生了局部或者整体破碎,非晶相含量增加了17.74%。微波辐照粉煤灰-水泥水化热可提前0.56 h达到终凝,其7 d未水化水泥所占面积较原粉煤灰-水泥浆体降低了15.8%,水泥水化进程明显加快。
Microwave irradiation activation has some unique advantages in improving the activity of fly ash,which is a kind of active excitation technology with high speed,low energy consumption and low carbon.In this paper,the effect of microwave irradiation power(500 W,800 W,1000 W)on the activity of fly ash was studied,and the microstructure of fly ash was characterized by X-ray diffraction(XRD)and scanning electron microanalysis(SEM-BSE),and the influence mechanism of active fly ash on cement hydration was studied.The results showed that microwave irradiation can improve the potential activity of fly ash.The optimum microwave irradiation power was 1000 W,and the activity index of 28 day was 80.89%.After microwave irradiation,the fly ash particles were partially or completely broken,and the amorphous phase content increased by 17.74%.The hydration heat of fly ash-cement irradiated by microwave can reach the final setting 0.56 h earlier,and the area of unhydrated cement at 7 days was 15.8%lower than that of original fly ash-cement slurry,which showed that the hydration process of cement was obviously accelerated.
作者
申宏栋
李书辉
罗树琼
葛亚丽
SHEN Hongdong(Jiaozuo New Materials Co.LTD.,Jiaozuo 454003,Henan,China)
出处
《水泥》
CAS
2024年第2期31-35,共5页
Cement
关键词
微波辐照
粉煤灰
活化
水化
microwave irradiation
fly ash
activation
hydration
