Effects of Micro Silica on Permeability of Plastic Concrete

作     者：Majid Pasbani Khiavi Mortaza Ali Ghorbani 

作者机构：Faculty of Engineering University of Mohaghegh Ardabili Ardabi156199-11367 Iran 

出 版 物：《材料科学与工程（中英文B版）》 (Journal of Materials Science and Engineering B)

年 卷 期：2014年第4卷第12期

页      码：372-375页

摘      要：Water tightness and seepage control are important considerations in the design and construction of dams. Plastic concrete cut-off walls are one of the effective means for seepage control in earth dams constructed on permeable substrate. An important requirement for the plastic concrete in such applications is adequate strength for the design loads and low enough permeability to meet the water tightness requirements of the dam. As permeability of cement-based materials, such as concrete, is mainly dependent on water to cement ratio, the permeability of plastic concretes is much higher than those of normal concretes. It is thus apparent that the achieving to low permeability is an important problem in plastic concrete. So a method, which could reduce the permeability of plastic concretes without unduly increasing their elastic modulus, would provide considerable technical advantages. In the present research, the possibility of lowering the permeability of plastic concrete thorough replacement of a portion of cement by micro silica was investigated. The aim of the experimental research was to investigate the effects of various levels of cement replacement by micro silica, including 0%, 3%, 6%, 9%, 12% and 15% on strength and permeability of plastic concrete. The results illustrate that the use of micro silica for replacement of some of the cement content in plastic concrete results in very substantial decrease in permeability. Obtained results show that through the use of micro silica in plastic concrete, it is possible to keep the strength and elastic modulus at the level of control mix and still achieve to reduction in permeability.

主 题 词：塑性混凝土防渗墙 低渗透性 微硅粉 塑料混凝土 土坝防渗 设计负荷 弹性模量 水泥基 

学科分类：08[工学] 081304[081304] 0815[工学-矿业类] 0805[工学-能源动力学] 080502[080502] 081503[081503] 0813[工学-化工与制药类] 

馆 藏 号：203108949...