Influence of Dispersed Industrial By-Products on the Strength of Concrete
Abstract
The introduction of dispersed mineral additives has a beneficial effect on many properties of concrete. This is due to a physical effect, which manifests itself in the fact that small particles usually have a finer granulometric composition than Portland cement and manifest themselves as a “micro-filler”. On the other hand, this may be due to their pozzolanic activity, which is manifested in the ability of silica and alumina to interact with calcium oxide hydrate and form calcium hydrosilicates and hydroaluminates. In this work, the activity of mineral dispersed components was estimated by the theoretical value of the coefficient of hydration activity, which was determined by their chemical composition. The actual coefficient of hydration activity was calculated from the maximum value of the mass
gain of dispersed industrial by-products by absorbing Ca(OH)2 from a saturated lime solution by these additives. The quantitative and material composition of crystalline compounds in industrial by-products was determined by one of the indirect methods, namely, by X-ray phase analysis. Experimental data showed that the actual pozzolanic activity was much lower than the theoretical value, and therefore the industrial by-products were arranged in the following sequence: ash-slag mixture - coal-enrichment by-product - blast furnace granulated slag, which is confirmed by the results of X-ray phase analysis and is consistent with the values of the compressive strength of concrete tested in different hardening periods.
About the Authors
E. S. GaishunKh. S. Yavruyan
Don state technical University
Russian Federation
Russian Federation
Candidate of Sciences (Engineering)
e-mail: khungianos@mail.ru
A. K. Khalyshev
Don state technical University
Russian Federation
Russian Federation
Candidate of Sciences (Engineering)
e-mail: khaljushev@mail.ru
V. N. Bobin
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Review
For citations:
Gaishun E.S., Yavruyan Kh.S., Khalyshev A.K., Bobin V.N. Influence of Dispersed Industrial By-Products on the Strength of Concrete. Concrete and Reinforced Concrete. 2021;604(2):8-13. (In Russ.)
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