tailieunhanh - Báo cáo hóa học: " Research Article Strain and Cracking Surveillance in Engineered Cementitious Composites by Piezoresistive Properties"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Strain and Cracking Surveillance in Engineered Cementitious Composites by Piezoresistive Properties | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2010 Article ID 402597 6 pages doi 2010 402597 Research Article Strain and Cracking Surveillance in Engineered Cementitious Composites by Piezoresistive Properties Jia Huan Yu1 and Tsung Chan Hou2 1 School of Civil Engineering ShenYang Jianzhu University LiaoNing 110168 China 2 Department of Civil and Environmental Engineering University of Michigan Ann Arbor Michigan 48105 USA Correspondence should be addressed to Jia Huan Yu yrudy@ Received 1 January 2010 Revised 29 June 2010 Accepted 3 August 2010 Academic Editor Joao Marcos A. Rebello . . . . . . . . . . Copyright 2010 J. H. Yu and T. C. Hou. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 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. 1. Introduction Engineered Cementitious Composite ECC is an ultra-ductile fiber reinforced cement based composite which has metal-like .