预先受荷对固化土抗海水侵蚀性能的影响

Effects of preloading on seawater erosion resistance of solidified soil

为研究受荷和海水侵蚀共同作用对工业废渣固化土强度的影响,对受到不同预先荷载水平的碱渣-矿渣-电石渣固化土进行海水侵蚀模拟,开展侵蚀试样无侧限抗压强度和X射线衍射等测试,并与水泥固化土和蒸馏水浸泡环境对比,重点探讨预先受荷水平和侵蚀龄期的影响规律及机理。结果表明:随着预先受荷水平的增加,固化土强度呈先增后减趋势,当预受荷载为40%或60%时强度达到最大,荷载为80%、海水侵蚀时强度降低;当预先受荷水平为60%、海水侵蚀120d时,碱渣-矿渣-电石渣和水泥固化土的强度分别为侵蚀前强度的60%和84%;较高荷载和海水长期侵蚀生成较多次生钙矾石和水化氯铝酸钙等物质导致固化土性质劣化,对固化土强度产生显著的不利影响。

To reveal the effects of preloading and seawater erosion on the strength of solidified soil,the erosion simulations of soda residue(SR)-ground granulated blast furnace slag(GGBS)-carbide slag(CS)solidified soil subjected to different preloading levels are conducted.The unconfined compressive strength and X-ray diffraction tests are carried out,and the influences of the preloading level and erosion age are mainly discussed.The results show that with the increase of the preloading level,the strength of solidified soil increases first and then decreases.The strength of the solidified soil reaches its maximum at the preloading level of 40%or 60%,but decreases under seawater erosion at the preloading level of 80%.When the preloading level is 60%and eroded by seawater for 120 days,the strength values of the SR-GGBS-CS solidified soil and cement solidified soil are 60%and 84%of the strength before erosion,respectively.High preloading and long-term seawater erosion generate large quantities of the secondary ettringite and hydrated calcium chloroaluminate,whose coupling effects lead to significant deterioration of the solidified soil.