Mospan V. The foam concrete reinforced with discrete polypropylene fibers

Object of research: processes of dispersed-reinforced cellular concrete structure formation and discrete polypropylene fibers impact on their properties. Aim: development of theoretical foundations of low-density foam with concrete high strength properties by creating the necessary structures when it is injected into the fibers of discrete components. Methods: determinotion of in put materials composition and tumors using X-ray diffraction, differential thermal, electron microscopic methods of analysis performed by DRON-2, derivatohrafa of A. Edrei, F. Paulik and N. Paulik, electron microscope "Dgeol - 25JS" . Theoretical and practical results: increasing dependence of the foam stability blowing agent PB-2000 by introducing colloidal carboxymethylcellulose stabilizer (Na-CMC) and liquid glass, which increase the solution viscosity of the mizhplivkovoho space and contribute the clogging of Plato channels, which reduces the flow rate of fluid and increas foam resilience, is made theoretical hough of the influence mechanism of discrete polypropylene fibers for concrete structure formation process art developed. Introduction fiber length from 5 to 30 mm of 0.1-0.3% pinomasu into foam creates a reinforcing frame, which reduces shrinkage phenomena during formation of products and gives structure common features of bu materials in the porosity, as well as similarite with granular materials wich have grain porosity, theoretically justified and experimentally confirmed the increasing possibility of physical and mechanical concrete properties due to polypropylene fibers reinforcement and discrete modified foam. An increasing strength in early hardening period to 0.6 MPa associated with structuring mixture fiber inclusions, increased internal friction and limited movement of the matrix components in the fibers. Improving strength indicators in later stages is the result of the intensification hidratatsiynyh processes it is during cement stone hardening and the solid phase increasing due to of fibers introduction for the first time found that the replacement of ground sand sawing waste of grounite dispersed-reinforced concrete leads to strength in increasing to 19,3-26,7% (1,1-1,2 MPa) by the surface energy due to granite artificial destruction and specific surface increasing in 12.5 times, the proposed theoretical positions allow to develop a modified foam content, foam compositions with the addition of mill sand and sawmill wastes of granite that containing polypropylene fibers of different lengths for heat-husulating materials. Degree of implementation: results of research were used in the manufacture of heat insulating products at OJSC "Novomoskovsk concrete and electrical products plant " in Novomoskovsk. Scope: the construction industry.