FINE-GRAINED SEMI-DRY PRESSED BASALT FIBER CONCRETE MATERIALS FROM MECHANICALLY ACTIVATED RAW MATERIALS MIXTURES ON CARBONATE FILLERS
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Abstract
This article is devoted to the study of pressed fine-grained basalt fiber concrete from mechanically activated raw materials mixtures based on limestone waste from stone mining. The microstructure of the pressed samples was investigated. A pilot test of the technology of mechanical activation and pressing of small-piece products was carried out. It is shown that bricks and paving slabs made using this technology meet the maximum requirements of GOST and have a brand of compressive strength of at least M400 (B30), frost resistance of at least F200, abrasion resistance of G1.
Subject of research: fine-grained semi-dry pressed basalt fiber concrete from mechanically activated raw materials mixtures on carbonate fillers.
Materials and methods: limestone deposits of the Crimea, Portland cement, basalt fibers were used for research. The preparation of basalt-fiber concrete mixtures was carried out on a paddle mixer-activator equipped with a rotary crusher. The rotor speed is 1500 rpm. From the resulting basalt fiber mixture, cylinders with a height and diameter of 5 cm were pressed on a press at a specific pressing pressure of 5, 10, 15, 20.25 MPa. The resulting cylinders at the age of 28 days were tested for compression according to GOST 10180-2012. The microstructure of basalt fiber concrete samples was studied using electron scanning microscopy on an electron microscope SEM-106, SELMI.
Results: the obtained results of experimental studies indicate an increase in the strength of basalt fiber concrete samples with an increase in pressing pressure for all types of limestone aggregates. Compared with samples on an inactive raw material mixture, the average density of samples on a mechanically activated raw material mixture increases by 2-5%. The compressive strength, respectively, increases by 1.22 – 1.46 times, and with an increase in pressing pressure to 15-25 MPa, the strength gain increases from 12-26% to 31-46%.
Conclusions: It is shown that the maximum compressive strength of the material corresponds to a specific pressing pressure of 15-25 MPa, regardless of the type of limestone raw material, and is 40-50 MPa. The microstructure of the pressed samples was studied and it was found that, compared with basalt fiber concrete obtained from mechanically activated raw materials mixtures by vibration, it is characterized by a denser structure of the material and a reduced content of cracks, pores and other structural defects.
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References
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