摘要
采用击实试验、液塑限联合测定界限含水率试验、蜡封法测定干密度试验、二氧化碳气量法、交换性钠离子百分比试验等方法,结合黏土矿物组成与结构特点,研究了水泥基土壤固化剂固化土的物理化学作用。试验结果表明:随着固化剂剂量的增加,混合料的最大干密度增大,最优含水率降低;固化土混合料经过养护后,塑性指数降低,干密度增大,碳酸盐含量增加,交换性钠离子百分比升高;黏土矿物在强碱性和钙离子作用下被激活,形成各种水化硅酸盐和铝酸盐。研究认为:在土-固化剂-水-气系统中通过液相和气相向固相的转变以及各类水化产物的填充、挤密、胶结等作用,混合料逐渐形成较致密的整体;离子交换反应对土体的加固作用在后期起负效应;铝硅酸盐黏土矿物在强碱性和钙离子存在条件下被分解,参与水化硅酸盐和铝酸盐的反应。
Using the compaction test, liquid-plastic limit combined device to Atterberg index, wax sealing method to dry density, gas meter to carbon dioxide and exchangeable sodium percentage test, as well as the composition and fabric of clay mineral, the physical and chemical actions of stabilized soil with cement-based soil stabilizer were researched. The experimental results show that the maximum dry density of the mixture increased and the optimum water content decreased as the dosages increased. After curing the mixture of stabilized soil, the plasticity index reduced, the dry density enhanced, the carbonate content increased, and the exchangeable sodium percentage raised. The clay mineral was activated to become all kinds of silicate and aluminate under the condition of stronger pH value and calcium ion. The study indicates that the mixture has gradually formed the more compact monolith in the system of soil and soil stabilizer and water and gas, through the transformation from liquid and gas to the solid, as well as the effect of fill, pack and cementation. The cation exchange has the minus effect in the later stage on the stabilized soil. The aluminosilicate clay mineral has been divided to take part in the action of the silicate and aluminate under the condition of the stronger pH value and calcium ion.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2010年第12期3741-3745,共5页
Rock and Soil Mechanics
基金
"十一五"国家科技支撑计划(No.2006BAD09B01
No.2006BAD11B03)
国家自然科学基金(No.50979094)
西北农林科技大学青年学术骨干项目(No.08)
西北农林科技大学基本科研业务费(No.QN2009089)
关键词
水泥基土壤固化剂
崮土机制
物理化学作用
cement-based soil stabilizer
mechanism of stabilized soil
physicochemical action
