改性糯米灰浆改良煤矸石渣土性能研究

STUDY ON THE PROPERTIES OF MODIFIED STICKY RICE MORTAR TO IMPROVE COAL GANGUE SLAG

我国现有煤矸石及存量达6.3×10^(9)t以上,大量煤矸石渣土的露天堆积带来了一系列环境问题,以煤矸石渣土为研究材料,针对其存在的大孔隙和难以留存水分的问题,掺入改性糯米灰浆、有机保水材料和改良剂对其抗压强度和水理特性进行改善。结果表明:棕丝纤维和松香酸钠使风干抗压强度和饱和抗压提高,硅藻土使抗压强度降低,其中2%的松香酸钠使风干抗压强度增大94.7%,0.9%的棕丝纤维使饱和抗压强度增大46.8%。改性糯米灰浆和有机保水材料对水理特性的影响十分显著,渗透系数从6.3×10^(-2)cm/s减小至3.2×10^(-5)cm/s,田间持水量从12.21%增大至21.21%,蒸发率从4.2%减小至3.33%。

China’s existing gangue and stock of more than 6.3billion,a large number of gangue slag open-pit accumulation has brought a series of environmental problems,with gangue slag as the research material,in view of its existence of large porosity and difficult to retain water problems,the incorporation of modified glutinous rice mortar,organic water retention materials and modifiers to improve its compressive strength and hydraulic characteristics.The results showed that brown silk fiber and sodium rosin increased the air-dried compressive strength and saturated compressive strength,and diatomaceous earth reduced the compressive strength,of which 2%sodium rosin increased the air-dried compressive strength by 94.7%,and 0.9%brown silk fiber increased the saturated compressive strength by 46.8%.The influence of modified glutinous rice mortar and organic water retention materials on hydrological properties was significant,and the permeability coefficient decreased from 6.3×10^(-2) cm/s to 3.2×10^(-5) cm/s,the water holding capacity in the field increased from 12.21%to 21.21%,and the evaporation rate decreased from 4.2%to 3.33%.