Shear Characteristic Study of RC beams Retrofitted with FRP and Cement Matrix Composite

The cement-matrix composite with the function of building structure and electromagnetic interference shielding was prepared by filling nickel fiber into cement. The dispersion of nickel fiber in cement-matrix composite and the shielding effectiveness of composite containing various volume fractions of nickel fiber were investgated in this paper. The electromagnetic interference shielding effectiveness in the frequency range of 0.1 MHz to 1.5 GHz and the conductivity of composite were measured by coaxial cable method and two-probe method, respectively. The dispersion of nickel fiber in cement was characterized by EPMA. The results indicated that the dispersion property of nickel fiber by sodium hexametaphosphatecan was better than sodium carboxymethylcellulose. The optimum contents of nickel fiber in composite was 5 vol.%, the maximum shielding effectiveness was 45.7 dB in 140 MHz and the minimum shielding effectiveness was 36 dB in 1240 MHz. The shielding effectiveness of composite with 7 vol.% nickel fiber was lower than that with 5 vol.% nickel fiber due to the tendency of nickel fiber cling to each other.

Download Full-text

The microstructure and performance of a cement matrix composite material

Journal of Wuhan University of Technology-Mater Sci Ed ◽

10.1007/bf02832628 ◽

2002 ◽

Vol 17 (2) ◽

pp. 74-77 ◽

Cited By ~ 2

Author(s):

Song Shao-min ◽

Liu Juan-hong ◽

Mei Shi-gang

Keyword(s):

Composite Material ◽

Matrix Composite ◽

Cement Matrix ◽

And Performance ◽

Microstructure And Performance

Download Full-text

Finite Element Analysis of the Prestressed Composite Pipes

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.687-691.440 ◽

2014 ◽

Vol 687-691 ◽

pp. 440-443

Author(s):

Qian Yu Huang ◽

Xiao Yu Zhang

Keyword(s):

Constitutive Model ◽

Matrix Composite ◽

High Strength ◽

Resin Matrix ◽

Cement Matrix ◽

Matrix Composites ◽

Corrosion Prevention ◽

The Matrix ◽

Resin Matrix Composite ◽

Composite Pipes

This topic develop the matrix composite pipes which has the ability of corrosion prevention and antiseep, also has the high strength of extension and stability, by using huge advantage of the corrosion prevention and antiseep performance of resin matrix composite, the high strength of extension of carbon steel, and also, the high stiffness of cement matrix composites. We design and optimize the structure of matrix composite pipes by study the relationship between deformation coordination based on the viscoelastic constitutive model of resin matrix composite, the homogeneity elastic constitutive model of the cement matrix composites. We obtain a basic method of design the matrix composite pipes from studying from theoretical analysis and numerical simulation.

Download Full-text

Strain sensing using carbon fiber

Journal of Materials Research ◽

10.1557/jmr.1999.0105 ◽

1999 ◽

Vol 14 (3) ◽

pp. 790-802 ◽

Cited By ~ 74

Author(s):

Xiaojun Wang ◽

Xuli Fu ◽

D. D. L. Chung

Keyword(s):

Carbon Fiber ◽

Carbon Fibers ◽

Matrix Composite ◽

Epoxy Matrix ◽

Strain Sensors ◽

Cement Matrix ◽

Strain Sensing ◽

Fractional Change ◽

Epoxy Matrix Composite ◽

Short Carbon

Carbon fiber provides strain sensing through change in electrical resistance upon strain. Due to piezoresistivity of various origins, a single carbon fiber in epoxy, an epoxy-matrix composite with short carbon fibers (5.5 vol%), a cement-matrix composite with short carbon fibers (0.2–0.5 vol%), and an epoxy-matrix composite with continuous carbon fibers (58 vol%) are strain sensors with fractional change in resistance per unit strain up to 625. A single bare carbon fiber is not piezoresistive, but just resistive.

Download Full-text