Robuta

https://www.wikidata.org/wiki/Q46461080
scientific article published in June 1988
electrical resonancemodelfrequencytuningsaccular
https://www.concrete.org/publications/internationalconcreteabstractsportal.aspx?m=details&i=51738783
The correlation between surface electrical resistivity and modulus of elasticity of fiber-reinforced concrete (FRC) was studied within early ages in this study
elastic modulusstudyearlyagefrc