THE EFFECT OF NANOADDITIVES ON THE HYDRATION OF GYPSUM BINDING AGENTS

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

RESEARCH OF ASYNCHRONOUS ELECTRIC DRIVE, OPTIMIZED ACCORDING TO THE CRITERION OF MAXIMIZING TORQUE-PER-AMP

In the article the research of the work of the asynchronous electric drive on the basis of the autonomous voltage inverter with the vector control system and the AD-906U engine in the modes of its full and partial use by...

ANALYSIS OF THE METHODS QUALITY ASSESSMENT WORK INJECTOR DIESEL LOCOMOTIVES

Railway industry is one of the largest consumers of diesel fuel in the country due to its use of diesel locomotives and diesel trains to perform transport and shunting operations. In the conditions of constant rise in fu...

SIMULATION OF INTERACTION OF THE WAY AND MOBILE COMPOSITION UNDER A DISCRETE SUB-FRAMEWORK BASIS IN THE AREA OF RAIL JOBS

A mathematical model is developed for estimating the stress state of rails in the zone of rail joints. As a design scheme of the railway track, a beam is adopted in the work on discrete elastically dissipative supports w...

STEEL-GLUED WITHOUT ANCHOR JOINT SHORT-TERM STRENGTH EXPERIMENTAL RESERCH ON ACRYLIC MODIFIED COMPOSITIONS

The central issue of the paper is the short-term adhesive strength dependence determining from the number of various technological factors and advanced acrylic composition selection for further elements constructions and...

ANALYSIS OF DYNAMICS OF PASSENGER TRAFFIC IN UKRAINE IN CONDITIONS OF SPEED TRANSPORTATION

The study analyzed the existing approaches to the development of passenger transportations on the railways of Ukraine. It is proved that there is a steady tendency to increase passenger turnover due to the introduction a...

Download PDF file
  • EP ID EP396487
  • DOI 10.18664/1994-7852. 178.2018.138994
  • Views 67
  • Downloads 0

How To Cite

Viktor Derevianko, Hanna Hryshko, Wladimir Moroz (2018). THE EFFECT OF NANOADDITIVES ON THE HYDRATION OF GYPSUM BINDING AGENTS. Збірник наукових праць Українського державного університету залізничного транспорту, 178(12), 88-97. https://europub.co.uk/articles/-A-396487