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Noncontact stress measurement from bare UHPC surface using R aman piezospectroscopy
Author(s) -
Yun HaeBum,
Eslami Elham,
Zhou Le
Publication year - 2018
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.5401
Subject(s) - materials science , stress (linguistics) , composite material , raman spectroscopy , quartz , compressive strength , microstructure , crystallite , analytical chemistry (journal) , mineralogy , chemistry , chromatography , metallurgy , optics , philosophy , linguistics , physics
Raman piezospectroscopy was applied for noncontact stress measurement from bare ultrahigh‐performance concrete (UHPC). Microstructure and chemical characterization were conducted for 3 phases of UHPC samples, including unmixed concrete ingredients (Sample 1), cured concrete (Sample 2), and pulverized concrete (Sample 3). Rich contents of polycrystalline silica (quartz) were observed from all samples. The global and local piezospectroscopy coefficients were measured from compressive loading frame tests at 3.77 cm −1 /GPa and 1.62–9.10 cm −1 /GPa, respectively. The quartz fingerprint peak was observed at 460.50 cm −1 from stress‐free UHPC powder, which can be used as the zero‐stress state to determine absolute stress in existing concrete structures. The global absolute stress equation is presented using the global piezospectroscopy coefficient and the zero‐stress state.