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作 者:张雄[1] 朱国鑫 吕欣妍 ZHANG Xiong;ZHU Guoxin;LV Xinyan(Key Laboratory of Advanced Civil Engineering Materials of the Ministry of Education,Tongji University,Shanghai 201804,China)
机构地区:[1]同济大学先进土木工程材料教育部重点实验室,上海201804
出 处:《同济大学学报(自然科学版)》2024年第7期1126-1134,共9页Journal of Tongji University:Natural Science
摘 要:为改良盐碱土壤,制备了一种隔水阻盐性能优异的超疏水颗粒材料,构建隔水阻盐材料与蓄水模式结合的盐碱地改造体系。以大漠砂为芯材,通过表面覆膜进行疏水改性,探究树脂和微纳米辅材掺量对材料疏水性、抗渗性和透气性的影响规律。利用微型土柱模拟地下水盐迁移过程,探究材料的隔水性能和阻盐性能。结果表明,在树脂、疏水碳酸钙和纳米二氧化硅掺量分别为1.0%、0.8%和0.2%时,材料接触角达到153.6°,耐静水高度达230 mm,并维持良好的透气性能。在微型土柱模拟试验中,隔水阻盐材料对水分蒸发和盐分上移的抑制作用明显,蒸发抑制率为50%~70%,盐分抑制率大于99%且在20次阻盐循环后维持97.5%以上。In order to improve saline-alkali soil,a superhydrophobic particle material with an excellent waterproof and salt-blocking performance was prepared,which was used to build a saline-alkali soil reconstruction system with a water-storage mode.Substrate material and desert sand were modified with a hydrophobic coating.The influences of resin content and micro-/nano-material content on the hydrophobicity,impermeability and breathability of the material were studied.A self-designed mini soil-column was used to simulate the migration process of underground saline water,and the waterproof and salt-blocking properties of the prepared materials were explored.The results show that when resin,hydrophobic CaCO3 and nano-SiO2 contents were 1.0%,0.8%and 0.2%,respectively,the material achieved a water contact angle of 153.6°,a water-resistant height of 230 mm,and maintained a good air permeability.The mini soil-column simulation test indicates that the material has a strong inhibition effect on the water evaporation and the upward movement of salt,with an evaporation-inhibiting rate of 50%to 70%and a salt-blocking rate of more than 99%,which maintains 97.5%after 20 test cycles.
分 类 号:TU577[建筑科学—建筑技术科学]
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