NMR Study on New Natural Building Materials

Florea, Iacob; Jumate, Elena; Manea, Daniela Lucia; Fechete, Radu

doi:10.1016/j.promfg.2019.02.206

Cited by 6 publications

(2 citation statements)

References 9 publications

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“…The evolution of the mechanical performances can be associated with the water bounded to material components [ 17 ] and with ion mobility, respectively [ 18 ]. In the cyclic voltammetry, the presence of the anodic wave situated at about +1.23 V can be correlated with the presence of the water at surface, after the redox reaction: 2H 2 O ↔ O 2 + 4 H + + 4e − …”

Section: Resultsmentioning

confidence: 99%

XANES, EXAFS, Voltammetric, and Microhardness Studies of Manganese Dioxide–Lead–Lead Dioxide Vitroceramics

2022

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In this work we investigated the electrochemical performances and mechanical behavior of the manganese dioxide–lead dioxide–lead vitreous system. The structural and electrochemical properties of vitroceramics were investigated by the analysis of X-ray diffraction (XRD) spectra, X-ray absorption spectroscopy (XAS), and measurements of cyclic voltammetry and linear sweep voltammetry. The mechanical properties of the studied samples were determined by Vickers hardness values using the indentation method. The analysis of X-ray absorption near edge structure (XANES) data for the L3 edge of the lead and the radial distribution function data for the PbO2 and Pb model indicate the modification of Pb-O interatomic distances by the doping process. The voltammetric study reveals the vitroceramic with x = 90 mol% Pb as the most suitable for application as a lead acid battery electrode.

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Section: Resultsmentioning

confidence: 99%

XANES, EXAFS, Voltammetric, and Microhardness Studies of Manganese Dioxide–Lead–Lead Dioxide Vitroceramics

2022

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“…The first peak (from the left) of the larger area can be assigned to the water bounded in the material components. The peaks situated at values of the higher relaxation time (from left to right) are attributed to the water in small pores, water in medium pores, and water in large pores [ 29 ]. For all investigated samples, the largest amounts of water are evidenced in the water bounded in the material components and few quantities of water correspond to the small, medium, and large pores.…”

Section: Resultsmentioning

confidence: 99%

Nanocomposites as Substituent of Cement: Structure and Mechanical Properties

et al. 2023

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To date, the scientific research in the field of recycling of construction and demolition wastes was focused on the production of concrete, cements, and bricks. The attainment of these products was limited to the addition of suitable binder contents, such as lime or cement, compaction, and possibly heat treatment, without a concrete recycling method. In this paper, new cement materials consisting of 2.5 weight% composite and originating from construction and demolition waste powder, were prepared and investigated in view of applications in the construction industry as a substituent of cement. The materials with recycled powder from construction and demolition wastes were characterized by X-ray diffraction (XRD), infrared (IR) and nuclear magnetic resonance (NMR) spectroscopy. The XRD data indicate vitroceramic structures with varied crystalline phases. The NMR relaxometry data show four reservoirs of water associated with bounded water and with three types of pores in the composite construction material. The micro-Vickers hardness was measured to reflect the influence of composite nature in the local mechanical properties of the composite-cement for the mixture with Portland cement and (EC) expired cement.

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