ABSTRACT
It is important to develop innovative methods to make cement highly sensing without any buried sensors in it. Also, highly sensing monitoring parameters have to be identified that can be easily adopted in the field. The overall objective was to characterise the mechanical behavior of smart cement under different loading conditions (compression, direct tension, splitting tension, and bending) and model the behavior, and also compare the responses to classical cements.
The new Vipulanandan piezoresistivity theory has been developed for cement and verified with experiments under compression, direct and splitting tension, and bending loading. With loading, the piezoresistive strain increased and the resistivity change was positive under both the compression and the tension loading, which also verified the piezoresistive cement theory. Also, electrical resistivity is a second-order tensor and changes can be monitored in three dimensions (3D). Vipulanandan p-q models were used to characterise the stress-strain and stress-piezoresisitive strain of standard cement and smart cement respectively. The Vipulanandan failure model was used to characterise the failure of smart cement with limited data.
