Investigation of the influence of carbon nanomaterials on change of structure and phase composition of cement and concrete

The results of studies of the structure and phase composition of cement stone modified with carbon nanomaterials, which were obtained as a co-product in a plasma plant are presented. Under the effect of plasma arc from the electrode material and coal supplied for the gasification, carbon nanomaterials - fullerene-containing soot are formed simultaneously in one apparatus. The introduction of carbon nanomaterials improves physical-mechanical and operational properties of cement and concrete by accelerating the hydration process of Portland cement, improving the microstructure and reduction of porosity of cement stone. The results of differential thermal analysis and infrared spectrometry of cement matrix indicate a change in the formed calcium hydrosilicates while carbon nanomaterials are added. The improvement in concrete strength at various periods of hardening, frost resistance, water absorption and water resistance of concrete has been fixed.