Hydraulic Cavitation Effects On Cement Properties

Cement is currently the most widely used and most consumed building material.How to reduce the energy consumption of cement production process and improve the performance of cement so as to achieve the concept of green environmental protection is an issue that needs to be solved urgently at this stage.The hydrodynamic cavitation effect is accompanied by a huge release of energy.How to effectively use this energy is also a problem that many scholars have been exploring.Therefore,this paper will focus on combining hydraulic cavitation effects with cement production applications,and try to explore how to improve cement production efficiency and performance through hydrodynamic cavitation effects.This article first compares various kinds of cavitation reaction generators and selects a suitable cavitation reaction generating device suitable for herein.This paper discusses the main technical parameters of the active hydraulic cavitation equipment,ie the gap between rotor and stator.Then the Fluent finite element software was used to simulate the flow field in the hydrodynamic cavitation generator to verify the occurrence of cavitation.Finally,the effect of cavitation on the properties of various types of cement was explored.Concluded as follow:(1)The active hydraulic cavitation equipment is simple in construction and the cavitation effect produced is drastic.Calculations show that when the stator and rotor size in the cavitation reaction blade is 0.5 mm,the energy consumption of the equipment is low.The numerical simulation of the flow field in the hydrodynamic cavitation generator was carried out by Fluent FEM software.It was verified that the cavitation will first occur around the rotor,and the cavitation will then spread to the surroundings as the liquid temperature increases.(2)The experimental data show that the specific surface area of the cement can be increased to 8000cm2/g by grinding by hydrodynamic cavitation,and can be saved at least 30%of energy consumption.compared with dry grinding(mill grinding).And the hydraulic cavitation has the effect of restoring the cement's standard strength for cement that has been deactivated for a long period of time.In the winter construction,the hydrodynamic cavitation has a good influence on the steam-cured cement stone.The isothermal aging temperature of the cement stone can be reduced by 10-15?,or the steam curing time can be shortened by 1 to 1.5 hours without affecting its strength.(3)The early strength of cements has been significantly increased activated by cavitation.Especially for slag cements,28 days after the mortar strength test,the bending strength and compressive strength of M400 slag cement exceed the specification?OCT10178-76(Russia Specification)slag cement strength requirements.The hydrodynamic cavitation has an activation effect on fly ash particles.It can destroy the fly ash particle surface and expose the internal glass phase of the fly ash particles.And the energy released by the cavitation can promote the pozzolanic effect of fly ash particles,making it further participate in the hydration reaction,thereby greatly improving the activity of fly ash in fly ash cement.