欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
针对高庙子膨润土在不同含水率和不同干密度条件下膨胀力时效性进行了试验研究。首先采用静力压实法将3种不同含水率的高庙子膨润土粉末压实为两种不同密实状态的试样，随后在保持压实试样的体积和含水率不变的条件下，分别静置0，1，7，15，30和90d，最后采用膨胀仪对完成静置试样的膨胀力进行量测；同时结合静置过程，完成了部分试样的扫描电镜（SEM）试验。试验结果表明：高庙子膨润土的膨胀力随静置时间的增长不断减小，且前期减小明显，后期逐渐趋于稳定：膨胀力的时效性与试样初始条件有关，试样含水率和干密度越大，膨胀力随静置时间的衰减越明显，即时效性越强。SEM试验结果表明，静置90d后，高庙子膨润土内的蒙脱石发生了水化，集合体分解，颗粒相互黏结，微观孔隙结构趋于均质化，呈现点阵式的絮状结构；试样静置过程中不同微观结构层次之间的水分重分布导致的蒙脱石水化是高庙子膨润土静置过程中膨胀力降低的主要内在原因。
英文摘要：
The ageing effects on the swelling properties of GMZ01 bentonite with different water contents and dry densities are investigated. Firstly, GMZ01 bentonite powder with three different water contents is statically compacted to samples with two dry densities. Then, the compacted samples with different initial conditions are kept for various periods of time （0, 1, 7, 15, 30 and 90 days） under constant volume and water content conditions. Afterwards, the aged samples are subjected to swelling pressure tests using the swelling apparatus. At the same time, the SEM tests are conducted on some samples after experiencing different ageing time. The test results show that the swelling pressure of GMZ01 bentonite decreases with the ageing time. The pressure decreases fast at the early days of ageing and then turns to stabilize after 30 days of ageing. The ageing effects on the swelling pressure of GMZ0/ bentonite depend on the initial conditions of the samples. The higher the initial water content and dry density, the stronger the ageing effects. The SEM test results indicate that the smectites hydration occurs in the 90-day aged samples. Aggregates decompose, particles bond with each other and the void distribution seems to be more homogenous, leading to a matrix type macrostructure. The smectites hydration induced by water redistribution between different microstructure levels is the rnain mechanism for the decrease of the swelling pressure of GMZ01 bentonite.
同期刊论文项目
同项目期刊论文
Adsorption of La(III) onto GMZ bentonite: effect of contact time, bentonite content, pH value and io
Hydraulic conductivity and microstructure changes of compacted bentonite/sand mixture during hydrati
Temperature effects on the swelling pressure and saturated hydraulic conductivity of the compacted G
An approach based on two-phase flow phenomenon for modeling gas migration in saturated compacted ben
Investigation on compressibility of highly compacted GMZ01 bentonite with suction and temperature co
Temperature effects on the unsaturated permeability of the densely compacted GMZ01 bentonite under c
The effects of technological voids on the hydro-mechanical behaviour of compacted bentonite–sand mix
Investigation on compression behaviour of highly compacted GMZ01 bentonite with suction and temperat
Investigation of the hydro-mechanical behaviour of compacted bentonite/sand mixture based on the BEx
Adsorptive removal of La(III) from aqueous solutions with 8-hydroxyquinoline immobilized GMZ bentoni
期刊信息
位置：