Influence of the Disperse Reinforcement Diameter on the Speed of Phase Transfer in Fibro-Foam Concrete Mixes

The actuality of solving one of the problems of foam concrete technology, which consists in reducing the period of phase transfer of foam concrete mixes from visco-plastic to elastic state, is shown. The possibility of achieving this goal by reducing the diameter of the reinforcing fiber is scientifically substantiated. This phenomenon is explained by the interrelation between the parameters of the zeta potential on the surface of the fibers and the size of the diameter of the disperse reinforcement, as well as the difference in the number of fibers at different diameters per mass unit. In the conducted studies several types of fiber were used as a reinforcing additive in foam concrete, which were equal in length, but differed in cross – section diameter – 18, 100, 150 microns. It is experimentally established that the reduction of the fiber diameter (on the example of polyamide fiber) by an order, provides an increase in the plastic strength of the mixtures by 5 times at the end of the third hour of hardening. Photos of the applied types of fiber after destruction of experimental samples are presented. It is visually established (at an increase in 200 times) that the use of fiber of the minimum diameter provides the best adhesion of new formations of a cement stone to a fiber surface. The interrelation between the total number of reinforcing fibers and the initial plastic strength of the foam concrete mixture is considered. It is experimentally established that with a decrease in the diameter of the disperse reinforcement by 5 times, the initial value of the plastic strength increases by 39%.

L.V. MORGUN¹, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)
D.A. VOTRIN¹, Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.)
V.N. MORGUN², Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ Don State Technical University (1, Gagarin Square, Rostov-on-Don, 344006, Russian Federation)
² Academia of Architecture and Arts of the Southern Federal University (105/42, Bolshaya Sadovaya Street, Rostov-on-Don, 344006, Russian Federation)

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