Single Fiber Reflectance Spectroscopy for the Monitoring of Cement Paste

• Tipo: Artigo em Revista Científica Internacional
• Data: 2021

Autores

da Silva, PM (Autor) Outra; Coelho, LCC (Autor) FCUP; de Almeida, JMMM (Autor) FCUP

Revista

A Revista está pendente de validação pelos Serviços Administrativos.

Título: Chemosensors

Vol. 13

Página Final: 312

ISSN: 2227-9040

Indexação

ISI Web of Knowledge - 0 Citações

Scopus - 0 Citações

Outras Informações

ID Authenticus: P-00V-N7S

DOI: 10.3390/chemosensors9110312

Abstract (EN): Reinforced concrete structures are an essential part of our modern society, and monitoring their structural health is of paramount importance. Early detection of decay allows for the reduction of repair costs and, more importantly, the prevention of catastrophic failure. For this purpose, a single fiber reflectance spectrometer was embedded in cement paste samples for the monitoring of water at the fiber tip through its sensitivity to changes in the refractive index. It monitored the curing of samples with different water-to-cement ratios (w/c), between 0.45 and 0.60, measuring the water exhaust during the hardening of the cement paste. It also measured the capillary coefficient from cement paste samples of 0.50, 0.55 and 0.60 w/c: 0.668 & PLUSMN; 0.002 mm/& RADIC;h, 1.771 & PLUSMN; 0.052 mm/& RADIC;h and 6.360 & PLUSMN; 0.269 mm/& RADIC;h, respectively. The capillary coefficient values agree with gravimetric measurements of sorptivity and are further confirmed through porosity measurements made with a scanning electron microscope. Thus, single fiber reflectance spectroscopy can be a gateway to inexpensively measure the entire life cycle of cement, from its curing until its eventual decay, assessing, in situ, its durability through the capillary coefficient.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 16