碱矿渣粉固化沙漠土力学性能及耐久性能研究  

Study on Mechanical Properties and Durability of Alkali-Activated Slag Powder Cured Desert Soil

作　　者：闫林 何晶 何建新[1] 杨海华[1] YAN Lin;HE Jing;HE Jianxin;YANG Haihua(College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi 830052, China;Urumqi Governmental Investment and Construction Engineering Management Center, Urumqi 830000, China)

机构地区：[1]新疆农业大学水利与土木工程学院,新疆乌鲁木齐830052 [2]乌鲁木齐市政府投资建设工程管理中心,新疆乌鲁木齐830000

出　　处：《人民黄河》2019年第5期86-89,共4页Yellow River

基　　金：新疆水利水电重点学科基金资助项目(XJXZ-2003-16)

摘　　要：结合新疆古尔班通古特沙漠环境特性,通过固化沙漠土击实试验、干湿循环试验以及冻融循环试验,研究其力学性能和耐久性能。结果表明:固化沙漠土最优碱矿渣粉固化剂掺量为14%,最优含水率为10%,此时最大密度为2.09 g/cm^3,28 d抗压强度为6.34 MPa。固化沙漠土28 d无侧限抗压强度随干湿循环次数的增多而增大,干湿循环9次时强度最大(8.67 MPa),比标准试样减小27.9%,之后无侧限抗压强度逐渐降低。固化沙漠土无侧限抗压强度随冻融循环次数的增加而增大,当冻融循环5次后增幅趋于平缓,冻融循环7次后强度随龄期的增大逐渐减小,9次冻融循环后的强度为7.8 MPa(标准养护试样的80.4%)。Based on the environmental characteristics of Gurbantunggut Desert in Xinjiang, the mechanical properties and durability of desert soil compaction test, dry and wet cycle test and freeze-thaw cycle test were studied. The results show that the curing agent of the optimal alkali slag powder in solidified desert soil is 14%, and the optimum water content is 10%, at which time the maximum density is 2.09 g/cm^3 and 28 d compressive strength is 6.34 MPa. The compressive strength of 28 d without lateral limit of cured desert soil increases with the increase of the number of dry and wet cycles, and when the number of dry and wet cycles reaches 9 times, the compressive strength of the non-lateral limit decreases gradually, at this time the maximum strength is 8.67 MPa, which is 27.9% lower than that of the standard specimen. The compressive strength of the solidified desert soil increases with the increase of the number of freeze-thaw cycles, and when the freeze-thaw cycle is 5 times, the increase tends to be flat, and when the number of freeze-thaw cycles reaches 7 times, the intensity decreases gradually with the increase of age, and the strength after 9 times freeze-thaw cycles is 7.8 MPa, which is 80.4% of the standard specimen.

关 键 词：碱矿渣粉固化剂 沙漠土 无侧限抗压强度 干湿循环 冻融循环 

分 类 号：S157.2[农业科学—土壤学]