A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Effects of Graphite Nanoplatelets on the Structure of Cementitious Materials
Abstract Graphite nanomaterials offer desired mechanical, geometric, and stability attributes for use as a discrete reinforcement system capable of enhancing the mechanical and durability performance of cement-based materials. This work employed nuclear magnetic resonance (NMR) spectroscopy techniques in order to gain further insight into the effects of distinctly high specific surface area and close spacing of graphite nanoplatelets with planar morphology on the structure of cement hydrates. 29Si and 27Al NMR spectroscopy techniques were employed, and analysis of results emphasized identification of the bonding conditions of SiO4 tetrahedra for resolving the structure of calcium silicate hydrate (C–S–H). Plain hydrated cement paste as well as those reinforced with graphite nanoplatelets was evaluated via NMR spectroscopy at 3 and 14 days of age. Addition of graphite nanoplatelets was found to increase the Q1/Q2 ratio, pointing to a reduction in the degree of polymerization of silicate tetrahedral in the C–S–H structure. The presence of graphite nanoplatelets also lowered the polarization of Q3, indicating reduced branching sites of C–S–H. Analysis of 27Al NMR spectra indicated that addition of graphite nanoplatelets lowered the concentration of calcium aluminate monosulfate hydrate among cement hydration products.
Effects of Graphite Nanoplatelets on the Structure of Cementitious Materials
Abstract Graphite nanomaterials offer desired mechanical, geometric, and stability attributes for use as a discrete reinforcement system capable of enhancing the mechanical and durability performance of cement-based materials. This work employed nuclear magnetic resonance (NMR) spectroscopy techniques in order to gain further insight into the effects of distinctly high specific surface area and close spacing of graphite nanoplatelets with planar morphology on the structure of cement hydrates. 29Si and 27Al NMR spectroscopy techniques were employed, and analysis of results emphasized identification of the bonding conditions of SiO4 tetrahedra for resolving the structure of calcium silicate hydrate (C–S–H). Plain hydrated cement paste as well as those reinforced with graphite nanoplatelets was evaluated via NMR spectroscopy at 3 and 14 days of age. Addition of graphite nanoplatelets was found to increase the Q1/Q2 ratio, pointing to a reduction in the degree of polymerization of silicate tetrahedral in the C–S–H structure. The presence of graphite nanoplatelets also lowered the polarization of Q3, indicating reduced branching sites of C–S–H. Analysis of 27Al NMR spectra indicated that addition of graphite nanoplatelets lowered the concentration of calcium aluminate monosulfate hydrate among cement hydration products.
Effects of Graphite Nanoplatelets on the Structure of Cementitious Materials
Farhadi, Nafiseh (author) / Peyvandi, Amirpasha (author) / Holmes, Daniel (author) / Soroushian, Parviz (author) / Balachandra, Anagi M. (author)
2018-09-24
9 pages
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2016
| British Library Online Contents | 2016
| British Library Online Contents | 2016