Ductility and Strength of Modified Recycled Aggregates Columns with Silica Fume and Hybrid Fiber

Abstract:

In order to make up for the defects of new and old aggregate, making full use of the function of silicon fume and hybrid fiber, cyclic loading tests were carried out on five concrete with recycled aggregate columns and an ordinary concrete frame column under the combined influence with different admixtures and its ratios (silica powder and hybrid fiber) . This text was focused on the properties and failure pattern of specimens, displacement ductility coefficient, ultimate displacement rotation and horizontal bearing capacity. The test results showed that a low content of silica powder could improve ductility performance, while the addition of hybrid fiber made the ductility to be further enhanced and improved the early strength by a larger margin than later stage. With the constitutive relation and adjusting the modification coefficient of concrete stress strain curve using MATLAB, It could be more accurate on the bearing capacity of the columns.

• Periodical: Applied Mechanics and Materials (Volumes 446-447)
• Pages: 1558-1565
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.446-447.1558
• Online since: November 2013
• Authors: Tao Li, Yuan Fang Du, She Liang Wang, Tao Yang
• Keywords: Ductility, Horizontal Bearing capacity, Hybrid Fiber, Recycled Concrete Columns, Silica Fume (SF)

References

[1] Zhou Hongmin, Chai Jun. Introduction of recycled aggregate concrete technology and current research situation［J］. Concrete, 2008(12): 75-76.

[2] Xiao Jianzhuang. Recycled Concrete[M]. BeiJing: Chinese Construction Industry Publishing house, 2008：142-147.

[3] Wang Sheliang, Yu Yang, Zhang Bo, . Experimental study on influence of mechanic properties of recycled concrete by fly ash and silica fuma[J]. Concrete, 2011（12）: 53-55.

[4] Ding Chunlin, Zhang Guofang, Zhang Hua. Experiment and Comparison on Shear Behavior of New Type Rod-like Polypropylene Fiber Reinforced Concrete[J]. Journal of Tongji University (Natural Science), 2011. 39(6): 802-806.

[5] Guo Junqing, Lei Zixue, Chen Penglango. Experimental study on ductility and bearing capacity of concrete frame columns with central reinforcement under high axial compression ratio [J]. Concrete, 2008, 29（4）: 89-95.

[6] GB 50011-2010 Code for seismic design of buildings［S］. Beijing: China Architecture ＆ Building Press，2010.

[7] Li Jiabin. Study on Mechanical Properties of Recycled Aggregate Concrete[D]. Shanhai： Tongji University. 2004：7-16.