Laser Radiation CO2 Effects in Cement Paste at Different Hydration Stages after Preparation

Abstract

Efectos de la radiación láser de CO 2 en la pasta de cemento a diferentes etapas de hidratación después de su preparaciónFrausto-Reyes C. CIO, Unidad Aguascalientes E-mail: cfraus@cio.mxBonilla-Petriciolet A. E-mail: petriciolet@hotmail.com González-Mota R. 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11 days after their preparation. Applied laser power changed Raman peaks intensity at 187.5cm-1, 563cm-1, 695cm-1, 750cm-1, 897cm-1, 1042cm-1 and 1159cm- Instituto Tecnológico de Aguascalientes

Effects of Static Magnetic Fields on the Physical, Mechanical, and Microstructural Properties of Cement Pastes

“…The effects of the treatment of fresh cement pastes with CO 2 laser radiation (10.6 m), in order to improve its mechanical properties in addition to obtaining lower setting times than those of a natural setting (without radiation), were reported before [15]. Also, the changes that occurred in cement pastes irradiated by 10.6 m CO 2 laser at different stages of hydration after preparation by using Raman spectroscopy, X-ray diffraction, and Scanning Electronic Microscopy (SEM) techniques to observe molecular structural changes were presented [16].…”

“…In the wavenumber of 1078 cm −1 we can identify the creation of dicalcium silicate (2CaO⋅SiO 2 ) which is known as belite, also a Portland cement main constituent and responsible for the long-term mechanical strength, as well as the gypsum (CaSO 4 ⋅2H 2 O) which is located in the 1279 cm −1 peak. Finally the tricalcium aluminate (3CaO⋅Al 2 O 3 ), also a main constituent of Portland cement and in charge of instant set and very early strength, is located in the peaks of wavenumber of 1581 cm −1 and 1732 cm −1 [16].…”

Microstructural and mechanical characterization of cement pastes subjected to static magnetic fields

“…In the wavenumber of 1078 cm we can identify the creation of -1 dicalcium silicate (2CaO•SiO 2 ) which is known as belite, also a Portland cement main constituent and responsible for the long term mechanical strength, as well as the gypsum (CaSO 4 •2H 2 O) which is located in the 1279 cm -1 peak. Finally the tricalcium aluminate (3CaO•Al 2 O 3 ), also main constituent of Portland cement and in charge of instant set and very early strength, is located in the peaks of wavenumber of 1581 cm -1 and 1732 cm -1 [14].…”

“…The effects of the treatment of fresh cement pastes with CO 2 laser radiation (10.6 μm), in order to improve its mechanical properties in addition to obtaining lower setting times than those of a natural setting (without radiation) were reported before [13]. Also, the changes occurred in cement pastes irradiated by 10.6 μm CO 2 laser at different stages of hydration after preparation by using Raman spectroscopy, X-ray diffraction and Scanning Electronic Microscopy (SEM) techniques used to observe molecular structural changes were presented [14].…”

Study of the Hydration Mechanism of Portland Cement with Raman Spectroscopy Applying CO2 Laser Radiation

“…Tere are traditional methods to improve the strength of cements, either with some type of additive in the mixture or by varying of the w/c ratio [11,12]. Moreover, there are studies where it has been possible to improve the mechanical properties and reduce the setting times with the application of CO 2 laser radiation in cement pastes [13,14]. Also, there are studies about the quantifcation of C 3 S and C 2 S with thermal techniques [15].…”