Strain and Cracking Surveillance in Engineered Cementitious Composites by Piezoresistive Properties
Tóm tắt
Engineered Cementitious Composites (ECCs) are novel cement-based ultraductile materials which is crack resistant and undergoes strain hardening when loaded in tension. In particular, the material is piezoresistive with changes in electrical resistance correlated with mechanical strain. The unique electrical properties of ECC render them a smart material capable of measuring strain and the evolution of structural damage. In this study, the conductivity of the material prior to loading was quantified. The piezoresistive property of ECC structural specimens are exploited to directly measure levels of cracking pattern and tensile strain. Changes in ECC electrical resistance are measured using a four-probe direct-current (DC) resistance test as specimens are monotonically loaded in tension. The change in piezoresistivity correlates the cracking and strain in the ECC matrix and results in a nonlinear change in the material conductivity.
Tài liệu tham khảo
Yu JH, Li VC: Research on production, performance and fibre dispersion of PVA engineering cementitious composites. Materials Science and Technology 2009, 25(5):651-656. 10.1179/174328408X327731
Yu JH, Dai L: Strain rate and interfacial property effects of random fibre cementitious composites. Journal of Strain Analysis for Engineering Design 2009, 44(6):417-425. 10.1243/03093247JSA513
Shah SP, Choi S: Nondestructive techniques for studying fracture processes in concrete. International Journal of Fracture 1999, 98(3-4):351-359.
Mindess S: Acoustic emission methods. In Handbook on Nondestructive Testing of Concrete. Edited by: Malhotra VM, Carino NJ. CRC Press, Boca Raton, Fla, USA; 2004.
Park G, Cudney HH, Inman DJ: Impedance-based health monitoring of civil structural components. Journal of Infrastructure Systems 2000, 6(4):153-160. 10.1061/(ASCE)1076-0342(2000)6:4(153)
Lecompte D, Vantomme J, Sol H: Crack detection in a concrete beam using two different camera techniques. Structural Health Monitoring 2006, 5(1):59-68. 10.1177/1475921706057982
Chung DDL: Damage in cement-based materials, studied by electrical resistance measurement. Materials Science and Engineering R 2003, 42(1):1-40. 10.1016/S0927-796X(03)00037-8
Kong HJ, Bike SG, Li VC: Effects of a strong polyelectrolyte on the rheological properties of concentrated cementitious suspensions. Cement and Concrete Research 2006, 36(5):851-857. 10.1016/j.cemconres.2006.02.006
Perry CC, Lissner HR: The Strain gage Primer. McGraw-Hill, New York, NY, USA; 1962.