Structural health monitoring and damage identification paper
Lim, YY 2014, 'Monitoring of concrete hydration using electromechanical impedance technique', in ST Smith (ed.), 23rd Australasian Conference on the Mechanics of Structures and Materials (ACMSM23), vol. II, Byron Bay, NSW, 9-12 December, Southern Cross University, Lismore, NSW, pp. 1155-1160. ISBN: 9780994152008.
Concrete hydration refers to the chemical reaction that begins once water is combined with cements. With time, the concrete hardens and increases in strength. Insufficient curing of concrete may severely impact its strength and durability, deteriorate its performance during service and threaten its safety. Therefore, an effective concrete hydration monitoring technique is crucial especially during the early age. In this study, the hydration of concrete will be monitored using the electromechanical impedance (EMI) technique. This active monitoring technique employs smart piezoelectric material, namely Lead Zirconate Titanate (PZT) that acts as collocated actuator and sensor. Experimental results show that the surface bonded PZT is effective in monitoring the initial setting and subsequent curing process of lab scale concrete prisms. The admittance signatures measured revealed that the stiffness of the concrete increases in the process of hardening. The first PZT’s resonance is found to be useful in monitoring early age hydration whereas the host structural resonances are effective in monitoring of curing after 1 day.