聚氨酯固沙剂的制备及其抗冻性能研究  

Studyon Preparation of Polyurethane Sand-Fixing Agent and Its Frost Resistance

作　　者：胡芹龙[1,2] 伍洋 叶长文[1,2] 刘建成 HU Qinlong WU Yang YE Changwen LIU Jiancheng(State Key Laboratory of Geohazard Prevention ＆ Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China College of Environment and Civil Engineering, Chengdu University of Technology, Chengdu 610059, China Sichuan Provincial Cultural Relics and Archeology Research Institute, Chengdu 610041, China)

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059 [2]成都理工大学环境与土木工程学院,四川成都610059 [3]四川省文物考古研究院,四川成都610041

出　　处：《人民黄河》2017年第9期74-78,共5页Yellow River

基　　金：四川省安全监管局安全生产科技项目(scaqjgjc_stp_2016007);四川省教育厅自然科学重点项目(16ZA0082)

摘　　要：针对目前固沙材料的抗冻性能较差、难以满足高寒地区工程建设的需求等问题,采取试验研究与理论分析相结合的方法,开展了聚氨酯固沙剂的制备及其在冻融循环条件下固结体物理力学性能的研究。试验制备固沙剂含量依次为4%、6%、8%、10%、12%、14%的固结体试样,在冻结温度为-20℃、融解温度为20℃条件下分别进行5、10、15、20、25次冻融循环试验,测定不同固沙剂掺量条件下冻融循环作用后固结体的强度损失与质量损失,并在此基础上利用扫描电镜从微观角度分析固结体内部结构的变化,探讨冻融循环条件下聚氨酯固沙材料的损伤劣化机制。结果表明:在冻融循环作用下,聚氨酯固沙体的抗压强度与固体质量的变化主要与固沙剂的浓度有关,微观试验显示聚氨酯固沙材料将松散的沙土通过包裹与"桥接"的方式连接起来,形成强度较高且具有一定韧性的整体,能够抵抗冻融循环的破坏作用。Aiming at the poor frost resistance of the sand stabilization materials, which is difficult to meet the demand of engineering con- struction in alpine regions, the preparation of polyurethane sand fixation material and its physical and mechanical properties under the freeze- thaw cycle conditions were carried out by combining the experimental study method with the theoretical analysis. In this study, samples with sand-fixing agent content of 4%, 6%, 8%, 10%, 12% and 14% were prepared, and then subjected to 5, 10, 15, 20 and 25 freeze-thaw cycles at freezing temperature of -20 ~C and thaw temperature of 20 ~C. Subsequently, the strength loss and mass loss of the consolidation body with different contents of sand-fixing agent were measured after the freeze-thaw cycles. On the basis of that, the microstructure of the consolidation body was analyzed from the micro point of view by SEM, and the damage degradation mechanism of the polyurethane sand stabi- lization material under the freeze-thaw cycles was discussed. The results show that under the condition of freeze-thaw cycle, the compressive strength and solid mass of polyurethane sand fixation are mainly related to the concentration of sand-fixing agent. Microscopic test shows that the loose grains of sand are connected by the ＂bridging＂ , thus it becomes a whole of strength and toughness which can resists the damaging effects of freeze-thaw cycles.

关 键 词：聚氨酯 固沙材料 冻融循环 微观机理 

分 类 号：S157.9[农业科学—土壤学]