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含盐铁尾矿砂在机械沙障中的固化性能
孙婧1,2, 刘宏波1,2, 毛世奇1, 安艳玲1, 康业玮1
1.河北建筑工程学院 土木工程学院, 河北 张家口 075000;2.河北土木工程诊断、改造与抗灾重点实验室, 河北 张家口 075000
摘要:
[目的] 针对荒漠区交通干线的风沙灾害问题,利用当地含盐铁尾矿砂为原料进行固化性能试验,用于制备新型机械沙障实现以废治灾。[方法] 采用普通硅酸盐水泥与华夏一号离子固化剂来固化含盐铁尾矿砂,通过干湿循环、冻融循环、自然风化试验后试样抗压强度变化综合评价其耐久性,并深入分析了孔隙结构的改变对耐久性能的影响机理。[结果] 7%~10%的水泥掺量就可以使固化试样的强度达到2MPa以上,复掺0.2‰的离子固化剂后可明显改善固化试样的强度和耐久性;孔隙结构分析表明,耐久性试验中,由于水汽及盐的迁移使试样的总孔体积增大,中孔或大孔占比增加,但未出现连通超大孔洞,强度损失小。[结论] 利用含盐铁尾矿砂作为一种工程材料,通过水泥与离子固化剂将其固化后可制备防风固沙用机械沙障,强度与耐久性均可满足工程要求,具有实际应用价值。
关键词:  含盐铁尾矿砂  离子固化剂  机械沙障  耐久性能  孔隙结构
DOI:10.13961/j.cnki.stbctb.2020.01.027
分类号:S157;S775
基金项目:青海省交通厅科技项目"鱼卡至一里坪铁路段雅丹地貌风沙防护可行性研究"(2015-12);张家口市科技计划项目"荒漠化区交通干线风沙治理模型的建立及其机理研究"(1811009B-05)
Solidification Performance of Salt-containing Iron Tailings in Mechanical Sand Barriers
Sun Jing1,2, Liu Hongbo1,2, Mao Shiqi1, An Yanling1, Kang Yewei1
1.School of Civil Engineering, Hebei University of Architecture, Zhangjiakou, Hebei 075000, China;2.Hebei Key Laboratory for Diagnosis, Reconstruction and Anti-disaster of Civil Engineering, Zhangjiakou, Hebei 075000, China
Abstract:
[Objective] Aiming at the problem of wind-sand disasters on the main traffic lines in desert areas, the solidification performance of local salt-containing iron tailings sand was studied to realize the preparation of mechanical sand barriers and the control of wind-sand disaster using waste.[Methods] Ordinary Portland cement and Huaxia I ionic curing agent were used to solidify salt-containing iron tailings. The durability and changes in strength of the test block were evaluated comprehensively after a dry-wet cycle, freeze-thaw cycle, and natural weathering test. The analysis emphasized the influence mechanism of pore structure change on durability.[Results] The strength of solidified specimens reached >2 MPa by mixing in 7% to 10% cement. The strength and durability of cured specimens could be improved obviously by adding 0.2‰ ionic curing agents. Analysis of the micro-pore structure showed that after the durability test, the total pore volume and the proportion of medium or large pores increased due to the migration of water vapor and salt. However, there were no connected large pores and the loss of strength was small.[Conclusion] Salt-containing iron tailings sand can be used as an engineering material, and can be solidified using cement and ionic solidifying agent to prepare mechanical sand barriers. The strength and durability tests were able to meet engineering requirements and thus have value for practical application.
Key words:  saline iron tailings  ionic curing agent  mechanical sand barriers  durability  pore structure