About the authors
| First name, Middle name, Last name, Scientific degree, Scientific rank, Current position. Full and brief name of the organization, The organization address. | Sergey A. Shakhov, Doctor of Technical Sciences, Associate Professor, Siberian State Transport University, Novosibirsk, Russian Federation E-mail This e-mail address is being protected from spambots. You need JavaScript enabled to view it ; ORCID: 0000-0003-4981-8359 |
| Title of the article | Effect of mechanoacoustic activation of wollastonite on the structure and strength of cement stone |
| Abstract. | Problem statement. A promising method for improving the properties of cement composites is to fill the matrix of the cement binder with highly dispersed mineral particles of various genesis and morphology. The effectiveness of mineral additives increases when such particles act as a seed, i.e. active centers around which newly formed structural elements of the cement stone are grouped, helping to strengthen the contact zone between the cement stone and the filler. At the same time, information on the state of structuring additives in activated solutions, on the effect of their dispersion on the structure and strength characteristics of the cement stone is extremely limited, which complicates the development of scientifically sound approaches to achieving the target effects of improving the physical and mechanical properties of concrete products. The purpose of the work is to quantitatively assess the effect of ultrasonic treatment of aqueous suspensions of mechanically activated wollastonite on changes in the structural-phase parameters and strength characteristics of the cement stone. The following objectives of the study are distinguished: the effect of sequential mechanical and acoustic treatment on the particle size of the dispersed phase of aqueous suspensions was studied; the effect of the dispersed composition of mechanoacoustically activated wollastonite on the phase composition and strength characteristics of cement stone was investigated. Results. As a result of successive mechanical and acoustic treatment, the dispersed phase is discretized to sizes less than 1 m. It was found that the use of aqueous suspensions with mechanoacoustically activated wollastonite for cement mixing helps to increase the mechanical strength of cement stone compared to the control sample. The mechanism of the strengthening effect of the additive is clarified by the results of X-ray phase analysis and assessment of the parameters of the pore structure of cement stone. The data obtained confirm the hypothesis about the role of nanoscale wollastonite particles as active crystallization centers, around which newly formed minerals of cement stone are grouped, promoting the strengthening of cement stone. Conclusions. The significance of the results for the construction industry is that mechanoacoustic treatment can be used to increase the activating potential of mineral additives used to modify cements. |
| Keywords. | Portland cement, wollastonite, mechanical activation, ultrasonic treatment, fractional composition, strength of cement stone |
| For citations: | Shakhov S.A. Effect of mechanoacoustic activation of wollastonite on the structure and strength of cement stone // News of KSUAE, 2024, № 4(70), p. 8-18, DOI: 10.48612/NewsKSUAE/70.1, EDN: BKAWQL |
