Measuring Water Vapor Sorption Hysteresis of Cement Paste through an Optical Fiber Sensor

• Type: Article in International Scientific Journal
• Date: 2023

Authors

da Silva, PM (Author) Other; Coelho, LCC (Author) FCUP; de Almeida, JMMM (Author) FCUP

Journal

The Journal is awaiting validation by the Administrative Services.

Title: CHEMOSENSORS

Vol. 11

Final page: 123

ISSN: 2227-9040

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 1 Citation

Other information

Authenticus ID: P-00X-W5K

DOI: 10.3390/chemosensors11020123

Abstract (EN): Water vapor sorption is a powerful tool for the analysis of cement paste, one of the most used substances by mankind. The monitoring of cementitious materials is fundamental for the improvement of infrastructure resilience, which has a deep impact on the economy, the environment, and on society. In this work, a multimode fiber was embedded in cement paste for real-time monitoring of cement paste water vapor sorption. Changes in the reflected light intensity due to the build-up of water in the cement paste's pores were exploited for this purpose. The sample was 7-day moist cured, and the relative humidity was controlled between 8.9% and 97.6%. Reflected light intensity was converted into a specific surface area of cement paste (133 m(2)/g) and thickness of water through the Brunauer-Emmett-Teller (BET) method and into a pore size distribution through the Barret-Joyner-Halenda (BJH) method. The results achieved through reflected light intensity agree with those found in the literature, validating the usage of this setup for the monitoring of water vapor sorption, breaking away from standard gravimetric measurements.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12