砒砂岩固结体防水抗蚀及紫外耐久性能研究

Study on Water Resistance,Anti-Erosion and UV Durability of Pisha Sandstone Solidified Body

采用W-OH对砒砂岩进行固结处理,通过水滴渗透、抗蚀性及紫外加速老化试验研究了固结体的防水性能、抗水蚀性能以及紫外耐久性能。结果表明:1将不同浓度的W-OH溶液喷洒在砒砂岩颗粒表面时,可形成一层具有一定厚度的弹性固结层,防水性能提高83倍左右;2水稳性指数由原岩的0.2提高至固结体的0.8,抗水蚀性能大大提高;3固结层具有良好的抗紫外老化性能,加速老化32 d后,质量损失在0.06 g/m^2以内,在当地的辐射强度下,5 a以内老化和分解可控;4采用W-OH处理后,砒砂岩坡面减沙比为99.78%。

W-OH was utilized to solidify weathering Pisha sandstone and through conducting water penetration, anti-erosion and UV acceleraled aging experiments, the properties of water resistance, anti-erosion and UV durability of solidified body were studied. The results show that when the different concentrations of W-OH solutions are sprayed on the weathering Pisha sandstone, an elastic consolidation layer with a certain thickness is formed. First, the layer is hydrophobic and when the water drops are dripped on the surface, the infiltration rate is very slow. Compared with the original Pisha sandstone, the time of penetration increases about 83 times. Second, the water stability index increases from 0.2 to 0.8, and the solidified body will not break in relatively short time, therefore, the anti-erosion performance is increased significantly. Third, the specimens are put into the aging oven in the conditions of 9 W/m^2 for 32 days, and the quality losses are less than 0.06 g/m^2, indicating that the specimens are not aged and broken. The UV radiant quantity equals to about 5 a quantity in Ordos, this means that the material can be controlled to be degraded in five years. Finally, a scouring experiment in the field is carried out and the sediment reduction in controlled slope is 99.78%.