Modification Specifics of Perlite-Based Geopolymer as Eco-Friendly Cement

The increase in the range of raw materials for geopolymer synthesis makes it possible to expand the potential areas of their practical application due to the availability of raw materials, as well as by identifying new properties of this group of free-of-cement eco-friendly or “green” materials. The effect of the following two factors: the type of mineral modifying component and the method of using an alkaline activating agent on some characteristics of a perlite geopolymer binder, such as water demand (W/T ratio), average density, and compressive strength, was studied in the article. The following materials were used as mineral modifying components: Portland cement, kaolinite, metakaolin, and citrogypsum. It has been found that a 24-hour aged alkaline solution of NaOH significantly reduces the water demand of the geopolymer by up to 46% compared to a freshly prepared alkali solution. The highest water demand is typical for mixes using mineral modifiers such as Portland cement, kaolinite, and metakaolin. It was found that the type of mineral modifier and the method of using an alkaline activating agent do not have a significant effect on the average strength of the geopolymer framework. Experimental studies have shown that the introduction of such modifiers as Portland cement and kaolinite into the perlite geopolymer matrix leads to its strengthening by 0.32–2 times.

N.I. KOZHUKHOVA^1,2, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ Belgorod State Technological University named after V.G. Shukhov (46, Kostukov Street, Belgorod, 308012, Russian Federation)
² Moscow Polytechnic University (38, Bolshaya Semyonovskaya Street, Moscow, Russian Federation)

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