The influence of polypropylene fibre on the physical and mechanical properties of glass-dolomite sheets

Introduction. One of the promising areas for the development of construction materials is to use carbonated materials with a low magnesium oxide content as raw materials for the production of binders and the manufacture of materials based on them. The relevance of the application of fibreglass reinforcement is related to the need to significantly increase the physical and mechanical properties of fibreglass dolomite sheets from magnesia binder. The introduction of polypropylene fibres will improve bending performance of composite material, increase in-service crack resistance and reduce shrinkage during hardening. The aim of the study was to select the optimal fibre concentration and determine its influence on the physical and mechanical properties of glass fibre dolomite sheets.

Materials and methods. The materials studied are glass dolomite sheets obtained by mixing burned dolomite, water solution of magnesium chloride, additives and fibrous reinforcement. The mechanical activation of the caustic dolomite was produced in a vortex layer device. The structure of the composite and the surface morphology were investigated by electron microscopic analysis. The influence of fibre parameters on the strength of the reinforced sheet was evaluated by a designed calculation model in the Ansys software complex.

Results. The results of the dependence of bending strength and specimen density on by concentration, length of polypropylene fibres are presented. The limit values of the stresses when bending, vertical movements of the unreinforced sheet, reinforced by fibres on the non-activated and mechanical activated binder are determined. A plasticity index for comparing the plastic deformations of the material was introduced and the value of fibre adhesion to the matrix was calculated.

Conclusions. It was established that the mechanical treatment of magnesium binder in a vortex layer device increases bending and residual strength, increases impact force, and the introduction of fibre prevents brittle fracture of the specimen.

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