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Influence of Alkali Metal Ions on the Structural and Spectroscopic Properties of Sm3+-Doped Silicate Glasses
(Multidisciplinary Digital Publishing Institute (MDPI), 2023)
Acceso abierto
In the present work, the influence of alkali ions (Li, Na, K) on the structural and spectroscopic properties of silica glasses doped with Sm3+ was investigated. Infrared and Raman spectroscopy techniques were used to ...
Influence of Synthetic Fibers on the Flexural Properties of Concrete: Prediction of Toughness as a Function of Volume, Slenderness Ratio and Elastic Modulus of Fibers
(MDPI, 2023)
Acceso abierto
The construction industry requires concrete with adequate post-cracking behavior for applications such as tunnels, bridges, and pavements. For this reason, polypropylene macrofibers are used, which are synthetic fibers ...
Analysis of delays and cost overruns of road construction projects in the Colombian Caribbean Region
(Nicolaus Copernicus University, 2023)
Acceso abierto
Construction projects are constantly threatened by delays and cost overruns that might compromise their viability. Th us, identifying the leading causes of these issues based on the experience of experienced professionals ...
Post-Cracking Properties of Concrete Reinforced with Polypropylene Fibers through the Barcelona Test
(Multidisciplinary Digital Publishing Institute (MDPI), 2023)
Acceso abierto
The Barcelona method was developed as an alternative to other tests for assessing the post-cracking behavior of fiber-reinforced concrete, with the main advantage being that it uses significantly smaller specimens compared ...
High pressure effect in the near-infrared emission of Nd3+-doped alkali silicate glasses
(Taylor & Francis, 2022)
Acceso restringido
The effect of high pressure (7.7 GPa) densification on the absorption and near-infrared emission of Nd-doped lithium, sodium and potassium disilicate glasses was investigated. Judd-Ofelt parameters O¿ (¿ = 2, 4 and 6) were ...
Experimental Volume Incidence Study and the Relationship of Polypropylene Macrofiber Slenderness to the Mechanical Strengths of Fiber-Reinforced Concretes
(MDPI, 2022)
Acceso abierto
An experimental study was conducted to examine the mechanical strengths of concretes with straight high-strength knurled polypropylene macrofibers. Incidences of concrete mechanical strengths were determined for three ...
Exploring the relationship between mental health-related problems and undergraduate student dropout: A case study within a civil engineering program
(Elsevier, 2022)
Acceso abierto
Dropout has always been a concerning issue within higher education. This research explores the relationship between mental health-related problems and undergraduate students’ dropout rates amid the COVID-19 pandemic and ...