Strain and damage sensing properties on multifunctional cement composites with CNF admixture

Abstract Both strain and damage sensing properties on carbon nanofiber cement composites (CNFCCs) are reported in the present paper. Strain sensing tests were first made on the material’s elastic range. The applied loading levels have been previously calculated from mechanical strength tests. The effect of several variables on the strain-sensing function was studied, e.g. cement pastes curing age, current density, loading rate or maximum stress applied. All these parameters were discussed using the gage factor as reference. After this first set of elastic experiments, the same specimens were gradually loaded until material’s failure. At the same time both strain and resistivity were measured. The former was controlled using strain gages, and the latter using a multimeter on a four probe setup. The aim of these tests was to prove the sensitivity of these CNF composites to sense their own damage, i.e. check the possibility of fabricating structural damage sensors with CNFCC’s. All samples with different CNF dosages showed good strain-sensing capacities for curing periods of 28 days. Furthermore, a 2% CNF reinforced cement paste has been sensitive to its own structural damage.

[1]  E. Kwon,et al.  A self-sensing carbon nanotube/cement composite for traffic monitoring , 2009, Nanotechnology.

[2]  D.D.L. Chung,et al.  Improving the electrical conductivity of composites comprised of short conducting fibers in a nonconducting matrix: The addition of a nonconducting particulate filler , 1995 .

[3]  Xiaohua Zhao,et al.  Pressure-sensitive properties and microstructure of carbon nanotube reinforced cement composites , 2007 .

[4]  D.D.L. Chung,et al.  Damage in cement-based materials, studied by electrical resistance measurement , 2003 .

[5]  Bing Chen,et al.  Conductivity of carbon fiber reinforced cement-based composites , 2004 .

[6]  D. Chung.  Cement-matrix composites for thermal engineering , 2001 .

[7]  D. Chung,et al.  Cement-matrix structural nanocomposites , 2004 .

[8]  D.D.L. Chung,et al.  Self-monitoring of fatigue damage in carbon fiber reinforced cement , 1996 .

[9]  Sihai Wen,et al.  Model of Piezoresistivity in Carbon Fiber Cement , 2006 .

[10]  I. De la Varga,et al.  Corrosion of steel reinforcement in structural concrete with carbon material addition , 2007 .

[11]  Yi-Lung Mo,et al.  Self-sensing of carbon nanofiber concrete columns subjected to reversed cyclic loading , 2011 .

[12]  D. Chung,et al.  Carbon fiber reinforced concrete for smart structures capable of non-destructive flaw detection , 1993 .

[13]  Salvador Ivorra,et al.  Effect of silica fume particle size on mechanical properties of short carbon fiber reinforced concrete , 2010 .

[14]  Florence Sanchez,et al.  Microstructure and macroscopic properties of hybrid carbon nanofiber/silica fume cement composites , 2009 .

[15]  O. Galao,et al.  Mechanical properties and corrosion of CAC mortars with carbon fibers , 2012 .

[16]  P. Garcés,et al.  Función de apantallamiento de interferencia electromagnética de pastas de cemento con materiales carbonosos y cenizas volantes procesadas , 2010 .

[17]  F. J. Baeza,et al.  Efecto de la adición de nanofibras de carbono en las propiedades mecánicas y de durabilidad de materiales cementantes , 2012 .

[18]  D.D.L. Chung,et al.  Unprecedented vibration damping with high values of loss modulus and loss tangent, exhibited by cement–matrix graphite network composite , 2010 .

[19]  E. Zornoza,et al.  Influence of the Oxidation Process of Carbon Material on the Mechanical Properties of Cement Mortars , 2011 .

[20]  D.D.L. Chung,et al.  Triple Percolation in Concrete Reinforced with Carbon Fiber , 2010 .

[21]  Mohamed Saafi,et al.  Wireless and embedded carbon nanotube networks for damage detection in concrete structures , 2009, Nanotechnology.

[22]  Oscar Galao,et al.  Multifunctional Cement Composites Strain and Damage Sensors Applied on Reinforced Concrete (RC) Structural Elements , 2013, Materials.

[23]  D.D.L. Chung,et al.  Electrical conduction behavior of cement-matrix composites , 2002 .

[24]  D. Chung,et al.  Piezoresistive Cement-Based Materials for Strain Sensing , 2002 .

[25]  Rashid K. Abu Al-Rub,et al.  Carbon Nanotubes and Carbon Nanofibers for Enhancing the Mechanical Properties of Nanocomposite Cementitious Materials , 2011 .

[26]  Eil Kwon,et al.  A carbon nanotube/cement composite with piezoresistive properties , 2009 .

[27]  M. Chiarello,et al.  Electrical conductivity of self-monitoring CFRC , 2005 .

[28]  D. Chung.  Functional properties of cement-matrix composites , 2001 .

[29]  Jerry A. Yamamuro,et al.  Discussion of "Resistance Changes during Compression of Carbon Fiber Cement Composites" , 2003 .

[30]  D.D.L. Chung,et al.  Effect of curing age on the self-monitoring behavior of carbon fiber reinforced mortar , 1997 .

[31]  F. Baeza,et al.  Effect of aspect ratio on strain sensing capacity of carbon fiber reinforced cement composites , 2013 .

[32]  I. Martín-Gullón,et al.  Carbon nanofibers enhance the fracture toughness and fatigue performance of a structural epoxy system , 2011 .

[33]  Pedro Garcés,et al.  Effect of carbon fibres on the mechanical properties and corrosion levels of reinforced portland cement mortars , 2005 .

[34]  D.D.L. Chung,et al.  CEMENT-MATRIX COMPOSITES FOR SMART STRUCTURES , 2000 .

[35]  M. Climent,et al.  Viabilidad de utilización de una pasta de cemento con nanofibras de carbono como ánodo en la extracción electroquímica de cloruros en hormigón , 2013 .

[36]  D.D.L. Chung,et al.  Concrete as a new strain/stress sensor , 1996 .

[37]  Salvador Ivorra,et al.  Variables affecting strain sensing function in cementitious composites with carbon fibers , 2011 .

[38]  Sihai Wen,et al.  Strain-Sensing Characteristics of Carbon Fiber-Reinforced Cement , 2005 .