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Development and Testing of Smart Cement Grouts with Sodium Silicate Additive and the Curing and Piezoresistive Behaviors Predicted Using Vipulanandan Models
In this study, highly sensing smart cement grouts with and without sodium silicate additive were developed and tested, and also the curing and piezoresistive behavior were modeled. Sensing cement grout was prepared using water-to-cement ratio of 0.8. Commercially available table top mixer was used at a speed of 1,000 rpm for 5 min and 0.075% carbon fibers (based on the cement weight) were added during the mixing process. Curing process of the cementitious materials was monitored with changes in electrical properties, which can also be easily monitored in the field. Electrical resistivity (sensing property) of the grouts was measured using a digital resistivity meter. Also, the electrical resistance changes with the curing time were measured using the LCR [inductance (L), capacitance (C), resistance (R)] meter with the two-probe method. The test specimens were capped and then tested at a controlled displacement rate to fail the specimen in about 30 min. Tests were performed up to 28 days of curing. The one day compressive strength of the smart cement grout was 3 MPa, and it increased to over 16 MPa after 28 days of curing. Addition of up to 3% sodium silicate reduced the compressive strength of the grout. Change in sensing parameter, the resistivity of the smart cement grout material under stress was investigated. During the compression test, electrical resistance was measured along the stress axis. Also, the change in sensing property was related to the applied stress to develop the piezoresistive relationship. The piezoresistive strain after one day curing was 155%, and it increased to 179% after 28 days of curing. The failure strain of cement grout is about 0.2%, so the smart cement grout was over 775 times (77,500%) more sensitive than the regular grout. Vipulanandan curing model, correlation model, and piezoresistive p-q model were used to characterize the smart grout behaviors.
Development and Testing of Smart Cement Grouts with Sodium Silicate Additive and the Curing and Piezoresistive Behaviors Predicted Using Vipulanandan Models
In this study, highly sensing smart cement grouts with and without sodium silicate additive were developed and tested, and also the curing and piezoresistive behavior were modeled. Sensing cement grout was prepared using water-to-cement ratio of 0.8. Commercially available table top mixer was used at a speed of 1,000 rpm for 5 min and 0.075% carbon fibers (based on the cement weight) were added during the mixing process. Curing process of the cementitious materials was monitored with changes in electrical properties, which can also be easily monitored in the field. Electrical resistivity (sensing property) of the grouts was measured using a digital resistivity meter. Also, the electrical resistance changes with the curing time were measured using the LCR [inductance (L), capacitance (C), resistance (R)] meter with the two-probe method. The test specimens were capped and then tested at a controlled displacement rate to fail the specimen in about 30 min. Tests were performed up to 28 days of curing. The one day compressive strength of the smart cement grout was 3 MPa, and it increased to over 16 MPa after 28 days of curing. Addition of up to 3% sodium silicate reduced the compressive strength of the grout. Change in sensing parameter, the resistivity of the smart cement grout material under stress was investigated. During the compression test, electrical resistance was measured along the stress axis. Also, the change in sensing property was related to the applied stress to develop the piezoresistive relationship. The piezoresistive strain after one day curing was 155%, and it increased to 179% after 28 days of curing. The failure strain of cement grout is about 0.2%, so the smart cement grout was over 775 times (77,500%) more sensitive than the regular grout. Vipulanandan curing model, correlation model, and piezoresistive p-q model were used to characterize the smart grout behaviors.
Development and Testing of Smart Cement Grouts with Sodium Silicate Additive and the Curing and Piezoresistive Behaviors Predicted Using Vipulanandan Models
Vipulanandan, C. (author)
International Foundations Congress and Equipment Expo 2024 ; 2024 ; Dallas, Texas
IFCEE 2024 ; 188-198
2024-05-03
Conference paper
Electronic Resource
English
| British Library Online Contents | 2018
Study of Microfine Cement/Sodium Silicate Grouts
| British Library Conference Proceedings | 1999