摘要
压实膨润土因其膨胀特性被用作高放射性核废料深地质处置工程的缓冲材料,膨润土的膨胀特性与其表面特性有关。对原始膨润土粉末以及被不同浓度的Na Cl溶液浸泡过的膨润土进行N2分子吸附实验,测得N2吸附等温线,对吸附等温线采用Frenkel-Halsey-Hill(FHH)方程和Neimark热力学方法计算表面分维,计算结果表明,采用两种方法计算的表面分维基本相同。膨润土的表面性质受Na Cl溶液浓度的影响较大,表面分维随Na Cl浓度的增加呈现出先增大后减小的趋势,这是由于浓度不同膨润土表面吸附的Na+量不同所引起的。
Compacted bentonite is used as buffer material for deep geological disposal project of highly radioactive nuclear waste due to its swelling properties,and the swelling properties of the bentonite is proved to be correlated with its surface characteristics. N2 molecule adsorption experiments of the original bentonite powder and the bentonite inundated by Na Cl solution with different concentration is processed,the Frenkel-Halsey-Hill（ FHH） equation and Neimark thermodynamic model are used to calculate the surface fractal dimension based on the N2 adsorption isotherms. It is found that the fractal dimension of bentonite estimated by these two methods is basically the same. The surface characteristics is greatly affected by the Na Cl concentration when the bentonite is inundated in Na Cl solution,and the surface fractal dimension of the Na-bentonite increases in Na Cl solution with low Na＋ concentration,and decreases in Na Cl solution with high Na＋ concentration,that is because the amount of Na＋ coating the clay particles is different.
出处
《地下空间与工程学报》
CSCD
北大核心
2016年第2期369-373,共5页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(41272318)
关键词
膨润土
表面分维
N2吸附
NACL溶液
bentonite
surface fractal dimension
N2 adsorption
NaCl solution
作者简介
项国圣（1986-），男，江苏泰兴人，博士生，主要从事膨润土工程特性的研究。E-mail：yongfuxu@sjtu．edu．cn
