Interfacial properties and nanostructural characteristics of epoxy resin in cement matrix

Du, Jiapei; Bu, Yuhuan; Shen, Zhonghou

doi:10.1016/j.conbuildmat.2017.12.200

Cited by 68 publications

(22 citation statements)

References 49 publications

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“…In the study, the polymer/C–S–H composite model with polyethylene glycol, polyvinyl alcohol, and polyacrylic acid, which were inserted into the nanochannel of C–S–H sheets, was constructed, and the calcium ions near the C–S–H surface were reported as the bridging substance between the polymer functional group and the oxygen in the silicate chain by forming O S –Ca–O p . Du et al [ 17 ] studied the epoxy resin/cement interface by using a combined experimental analysis and molecular simulation with a C–S–H/resin interface model and measured the adhesion energy of the C–S–H/resin interface. The results showed that the polarity of the resin enhanced the attraction between positive ions (such as Ca 2+ ) and water molecules to the resin molecules.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Binding Energy between Calcium-Silicate-Hydrates and Epoxy Resin: A Molecular Dynamics Study

et al. 2021

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Microcapsules encapsulated within epoxy as a curing agent have been successfully applied in self-healing materials, in which the healing performance significantly depends on the binding behaviour of the epoxy curing agent with the cement matrix. In this paper, the binding energy was investigated by molecular dynamics simulation, which could overcome the shortcomings of traditional microscopic experimental methods. In addition to the construction of different molecular models of epoxy, curing agents, and dilutants, seven models were established to investigate the effects of chain length, curing agent, and epoxy resin chain direction on the interfacial binding energy. The results showed that an increase of chain length exhibited had limited effect on the binding energy, while the curing agent and the direction of the epoxy significantly affected the interfacial binding energy. Among different factors, the curing agent tetrethylenepentamine exhibited the highest value of interfacial binding energy by an increment of 31.03 kcal/mol, indicating a better binding ability of the microcapsule core and the cement matrix. This study provides a microscopic insight into the interface behaviour between the microcapsule core and the cement matrix.

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Section: Introductionmentioning

confidence: 99%

Interfacial Binding Energy between Calcium-Silicate-Hydrates and Epoxy Resin: A Molecular Dynamics Study

et al. 2021

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“…The maximum simulation time was dependent on each particular system and was determined after thermodynamic equilibrium had been reached (constant total potential energy). The temperature was controlled by a Nose-Hoover thermostat and kept constant at 298 K [51]. The forcefield used to calculate the interaction between the cement and the CNT was the condensed-phase optimized molecular potential for atomistic simulation studies forcefield (COMPASSII) [52], a forcefield based on ab initio calculations that allows describing the structure and properties of molecules and condensed phase systems, in a wide range of temperature and pressure values.…”

Section: Calculation Methods and Model Systemsmentioning

confidence: 99%

Reinforcing cement with pristine and functionalized carbon nanotubes: experimental and simulation studies

Merodio-Perea

Páez-Pavón

Lado-Touriño

2020

International Journal of Smart and Nano Materials

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In recent years, the addition of carbon nanotubes to construction materials has attracted considerable interest, due to the improvement of mechanical, electrical, and thermal properties of cement. The incorporation of carbon nanotubes into a cement matrix causes an increase of several mechanical properties of up to 170% even with low carbon nanotubes concentrations. The objective of this study is to analyze the influence of the type of functionalization and number of walls of carbon nanotubes on the interaction between these nanostructures and a cement surface and thus, on the improvement of their mechanical properties. Thus, single-walled and double-walled carbon nanotubes were used to investigate the influence of the number of walls. The effect of carbon nanotube functionalization was studied using carbon nanotubes functionalized with carboxyl and carboxylate groups. The experimental results demonstrate that the incorporation of carbon nanotubes into the cement matrix improves the mechanical properties of the resulting material. Functionalized carbon nanotubes perform better than pristine carbon nanotubes. Electrostatic attractions play a central role in establishing strong interactions between the carbon nanotubes and the cement surface. The presence of neutral polar groups on the carbon nanotube surface also improves this interaction. The number of walls seems to be less important.

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“…It has been found that the substrate's humidity has a significant influence on test results, which makes it necessary to ensure strict control of the testing conditions [8,9]. A review of relevant literature shows that resin tests are carried out on various test stands [10][11][12], which indicates the need to modify the standards to correspond to the scope of conducted tests. The lack of standardised procedures taking into account the possibility of assessing properties makes it impossible to compare the results obtained at various research centres [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Mechanical Properties of ESD Pseudoplastic Resins for Joints in Working Elements of Concrete Structures

2020

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Concrete structure joints are filled in mainly in the course of sealing works ensuring protection against the influence of water. This paper presents the methodology of testing the mechanical properties of ESD pseudoplastic resins (E-elastic deformation, S-strengthening control, D-deflection control) recommended for concrete structure joint fillers. The existing standards and papers concerning quasi-brittle cement composites do not provide an adequate point of reference for the tested resins. The lack of a standardised testing method hampers the development of materials universally used in expansion joint fillers in reinforced concrete structures as well as the assessment of their properties and durability. An assessment of the obtained results by reference to the reference sample has been suggested in the article. A test stand and a method of assessing the mechanical properties results (including adhesion to concrete surface) of pseudoplastic resins in the axial tensile test have been presented.

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Interfacial properties and nanostructural characteristics of epoxy resin in cement matrix

Cited by 68 publications

References 49 publications

Interfacial Binding Energy between Calcium-Silicate-Hydrates and Epoxy Resin: A Molecular Dynamics Study

Interfacial Binding Energy between Calcium-Silicate-Hydrates and Epoxy Resin: A Molecular Dynamics Study

Reinforcing cement with pristine and functionalized carbon nanotubes: experimental and simulation studies

Assessment of the Mechanical Properties of ESD Pseudoplastic Resins for Joints in Working Elements of Concrete Structures

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