Quantitative evaluation of cement paste carbonation using Raman spectroscopy

Quantitative enantioselective Raman spectroscopy.

Analytical methods for quantitative enantioselective measurements are highly desirable in the life sciences. Existing technologies have disadvantages such as limited temporal resolution, the need for molecular labeling, or high experimental complexity. To overcome these limitations, this work presents a method based on conventional Raman spectroscopy. A systematic investigation of the key param...

High Performance Method for Skin Roughness Detection Using Raman Spectroscopy

Decalcification shrinkage of cement paste

Decalcification of cement paste in concrete is associated with several modes of chemical degradation including leaching, carbonation and sulfate attack. The primary aim of the current study was to investigate the effects of decalcification under saturated conditions on the dimensional stability of cement paste. Thin (0.8 mm) specimens of tricalcium silicate (C3S) paste, white portland cement (W...

Quantitative label-free RNA detection using surface-enhanced Raman spectroscopy.

Surface-Enhanced Raman Spectroscopy (SERS) was performed to detect label-free RNA. We defined conditions which make it possible to probe the four bases of RNA, in single strands of polyadenosine (pA), polyuridine (pU), polycytosine (pC) and polyguanosine (pG). We therefore present below a quantitative analysis of mixtures of non-hybridized single strands, based on the deconvolution of the SERS ...

Study on the Carbonation Behavior of Cement Mortar by Electrochemical Impedance Spectroscopy

A new electrochemical model has been carefully established to explain the carbonation behavior of cement mortar, and the model has been validated by the experimental results. In fact, it is shown by this study that the electrochemical impedance behavior of mortars varies in the process of carbonation. With the cement/sand ratio reduced, the carbonation rate reveals more remarkable. The carbonat...