Improvement Interfacial Transition Zone of Green Concrete by utilization of nano-SiO2 particles
According to the development of application of nano-particles in enhancing the strength and durability of Cement Based Materials (CBM) in recent decade, application of nano-particles (with different contents and dimensions) is known as one notable achievement, based on high pozzolanic performance of these particles in the matrix of CBM. On the other hand, by entry of environmental protection issue into concrete technology and industry, and importance of reducing the environmental effects of concrete, many attentions are attracted toward production of Green Concrete. Accordingly, in this study, low content application of nano-silica particles as cement replacement is selected as target to investigate the influences of these particles on mechanical properties and microstructure of green concretes made by recycled aggregates. Hence, mixes with constant W/C ratio of 0.4, Super Plasticizer content of 0.35％, Binder content of 400 Kg/m3, 100％ recycled aggregate replacement, and different amounts of nano-particles were fabricated. Alongside, to examine the micro-structure and mechanical properties of recycled concrete, Scanning Electron Microscopy (SEM) test and compressive strength have been applied respectively. Based on experimental data, specimens containing nano-particles possess higher compressive strength and more compact Interfacial Transition Zone (ITZ), and higher contents of nano-silica particles led to continues of this developing trend. In addition, the compressive strength of Recycled Concrete containing 3％ nano-silica particles were higher than Conventional Concrete in all different ages which shows the capability of producing Recycled Concretes with acceptable high strength and durability in near future.
Nano-SiO2 particles Green Concrete ITZ Compressive Strength SEM
P. Hosseini A. Booshehrian M. Delkash S. Ghavvami M. M. K. Zanjani
Concrete & Advanced Materials Group, Tolou Technology Development Institute, Sharif University of Te R&D section, Arya Sanat Fotros Co., Tehran, Iran.
国际会议
北京
英文
825-830
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）