Noncontact Stress Measurement From Bare Uhpc Surface Using Raman Piezospectroscopy

Keywords

absolute stress; noncontact stress sensing; piezospectroscopy coefficients; Raman piezospectroscopy; UHPC

Abstract

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.

Publication Date

9-1-2018

Publication Title

Journal of Raman Spectroscopy

Volume

49

Issue

9

Number of Pages

1540-1551

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1002/jrs.5401

Socpus ID

85050461727 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85050461727

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