摘要
为提高渣土资源的利用,研究了粉煤灰、污泥和秸秆作为原材料来烧制渣土陶粒,并通过温度优化和配方优化制备出500～700密度等级不同粒径的渣土陶粒。采用扫描电镜对制备的渣土陶粒进行了微观结构分析。研究结果表明:渣土-粉煤灰最适宜制备渣土陶粒,且当渣土掺量50%～70%、粉煤灰掺量30%～50%及焙烧温度1 200～1 250℃时,可制备出500～700密度等级不同粒径的渣土陶粒;随着密度等级的降低,同一粒径渣土陶粒的筒压强度逐渐降低,由700密度等级下的4.3MPa降低至500密度等级下的2.0MPa;相同粒径下,低密度等级内部孔径较大,且连通孔较多;相同密度等级下,小粒径内部封闭孔较多,且孔结构密度较高。
In order to improve the utilization ratio of residual soil resources,the fly ash,the sludge,and the straw can be used as raw materials to burn muck ceramsite,different particle sizes of 500~700 density grade muck ceramsite were successfully fabricated through the temperature optimization and the formula optimization was studied.Meanwhile,the microstructures were analyzed for the abovementioned muck ceramsites.The results show that residual soil-fly ash is the most suitable for the preparation of muck ceramsite.When the contents of residual soil and the fly ash were correspondingly 50%~70%and 30%~50%,the calcination temperature was 1 200~1 250℃,the residue of 500~700 density grade with different particle sizes can be prepared.With the decrease of the density grade,the cylinder compressive strength of the same size muck ceramsite decreased gradually from 4.3 MPa of 700 density grade to 2.0 MPa of 500 density grade.Under the same particle size,the internal pore size of low density grade was larger,and the number of connected pores was more.At the same density level,there were more internal closed holes and higher density degree of the pore structure.
作者
高二利
GAO Er-li(Inner Mongolia Traffic Design and Research Institute Co.,Ltd.,Huhehaote 010010,China)
出处
《交通科学与工程》
2019年第1期25-31,共7页
Journal of Transport Science and Engineering
关键词
陶粒
渣土
粉煤灰
密度等级
孔结构
ceramsite
muck
fly ash
density grade
pore structure
