THE EFFECT OF NANOADDITIVES ON THE HYDRATION OF GYPSUM BINDING AGENTS
Journal Title: Збірник наукових праць Українського державного університету залізничного транспорту - Year 2018, Vol 178, Issue 12
Abstract
The results of investigation of hydration processes of gypsum with carbon nanomodifiers are presented in the article. Gypsum modification by multilamellar carbon nanotube (CNT) results in the improvement of its compression strength. Experiments proved that at the nanotubes content of 0,18 %, strength improvement by up to 30 % is observed. Chemical functionalization of carbon nanotube surface facilitates the reduction of the sedimentation effect inherent to the nanoparticles, enables more uniform nanostructure dispersion throughout the modified material volume and provides the chemical interaction between nanotubes and the substance matrix. Quantum-chemical analysis methods confirm that the interaction of calcium sulfate dihydrate molecule with the dihydrate -like surface is the chemical process. The improvement of CNT-containing gypsum composite strength is due to the accelerated process of calcium sulfate dihydrate crystallization at the graphene surface. Therefore, it may be assumed that CNTs act as “crystallization nuclei” in the gypsum composite. The analysis of the microstructure of gypsum composition samples showed that without the modifying additive, loose structure of the gypsum samples is formed with a significant number of pores.It may be assumed that nanodispersed CNT additives act as “crystallization nuclei” on the surface of which calcium sulfate matrix structuring occurs with the improvement of the gypsum composition structural characteristics. This is due to the fact that during growth, crystals partly penetrate into each other and form three-dimensional network permeating and incorporating the entire gypsum stone into a body.
Authors and Affiliations
Viktor Derevianko, Hanna Hryshko, Wladimir Moroz
Keywords
Related Articles
- EP ID EP396487
- DOI 10.18664/1994-7852. 178.2018.138994
- Views 65
- Downloads 0
AUTOMATION OF PROCESS OF FORMATION OF THE STAFF LIST IN THE REGION OF THE RAILROAD
Automation of process of definition and optimization of numerical and qualitative structure of employees of cargo stations of the railroad is getting a particular importance in modern conditions of development of informa...
OPTIMIZATION OF RAILWAY NETWORK CAPACITY MANAGEMENT IN CONDITIONS OF SPEED PASSENGER TRANSPORTATION
At the present time, it is relevant to develop organizational and technical measures to increase the available throughput of the network by optimizing the flow of trains, taking into account operational changes in its to...
PECULIARITY OF PROJECT AND CALCULATIОN OF SYMMETRIC SWITCHES FOR RAILWAY AND INDUSTRIAL TRANSPORT
Equilateral switch is switch with all elements are arranged symmetrically relative to the axis of the main path. Equilateral switches are widely used in marshalling-yard bays stations, because they work in cramped condit...
A MATHEMATICAL MODELING OF AC ELECTRIC LOCOMOTIVE WITH ACTIVE CONVERTER IN TRACTION
One of the ways to increase the power factor of AC electric locomotives with DC traction motors is the use of converters on fully controlled semiconductor devices — active current source rectifiers. However, the modes of...
RESEARCHING OF THE CONFORMANCE RATING FOR LOCOMOTIVE REPAIR PRODUCTION
The determination of the conformance rating of locomotive repair production is associated with the formalization of expert statements obtained during its survey. In the article the structure of the compliance indicator o...