Single Fiber Reflectance Spectroscopy for the Monitoring of Cement Paste

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 f...

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Autores principales:	Pedro M. da Silva, Luís C. C. Coelho, José M. M. M. de Almeida
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	fiber optic sensor cement paste cure hydration durability permeability Biochemistry QD415-436
Acceso en línea:	https://doaj.org/article/c74cf35b59654312931a0d6b51c10022
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spelling	oai:doaj.org-article:c74cf35b59654312931a0d6b51c100222021-11-25T17:13:36ZSingle Fiber Reflectance Spectroscopy for the Monitoring of Cement Paste10.3390/chemosensors91103122227-9040https://doaj.org/article/c74cf35b59654312931a0d6b51c100222021-11-01T00:00:00Zhttps://www.mdpi.com/2227-9040/9/11/312https://doaj.org/toc/2227-9040Reinforced 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 (<i>w/c</i>), 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 <i>w/c</i>: 0.668 ± 0.002 mm/√h, 1.771 ± 0.052 mm/√h and 6.360 ± 0.269 mm/√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.Pedro M. da SilvaLuís C. C. CoelhoJosé M. M. M. de AlmeidaMDPI AGarticlefiber optic sensorcement pastecurehydrationdurabilitypermeabilityBiochemistryQD415-436ENChemosensors, Vol 9, Iss 312, p 312 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	fiber optic sensor cement paste cure hydration durability permeability Biochemistry QD415-436
spellingShingle	fiber optic sensor cement paste cure hydration durability permeability Biochemistry QD415-436 Pedro M. da Silva Luís C. C. Coelho José M. M. M. de Almeida Single Fiber Reflectance Spectroscopy for the Monitoring of Cement Paste
description	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 (<i>w/c</i>), 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 <i>w/c</i>: 0.668 ± 0.002 mm/√h, 1.771 ± 0.052 mm/√h and 6.360 ± 0.269 mm/√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.
format	article
author	Pedro M. da Silva Luís C. C. Coelho José M. M. M. de Almeida
author_facet	Pedro M. da Silva Luís C. C. Coelho José M. M. M. de Almeida
author_sort	Pedro M. da Silva
title	Single Fiber Reflectance Spectroscopy for the Monitoring of Cement Paste
title_short	Single Fiber Reflectance Spectroscopy for the Monitoring of Cement Paste
title_full	Single Fiber Reflectance Spectroscopy for the Monitoring of Cement Paste
title_fullStr	Single Fiber Reflectance Spectroscopy for the Monitoring of Cement Paste
title_full_unstemmed	Single Fiber Reflectance Spectroscopy for the Monitoring of Cement Paste
title_sort	single fiber reflectance spectroscopy for the monitoring of cement paste
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/c74cf35b59654312931a0d6b51c10022
work_keys_str_mv	AT pedromdasilva singlefiberreflectancespectroscopyforthemonitoringofcementpaste AT luiscccoelho singlefiberreflectancespectroscopyforthemonitoringofcementpaste AT josemmmdealmeida singlefiberreflectancespectroscopyforthemonitoringofcementpaste
_version_	1718412617418014720

Single Fiber Reflectance Spectroscopy for the Monitoring of Cement Paste

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