ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 66, (2) 218 - 227 (2022)


THE EFFECT OF POZZOLANIC WASTE OF DIFFERENT NATURE ON THE HYDRATION PRODUCTS, STRUCTURE AND PROPERTIES OF HARDENED CEMENT PASTE
 
Barkauskas Kestutis, Nagrockiene Džigita, Pundiene Ina
 
Vilnius Gediminas Technical University, Sauletekio av. 11, Vilnius, LT-10223, Lithuania

Keywords: Ground Waste Glass, Metakaolin, Cement Paste, Microstructure, Compressive Strength
 

The paper analyses the effect of different pozzolanic waste – ground waste glass, metakaolin and addition made of ground waste glass and metakaolin, on cement hydration and physical-mechanical properties of hardened cement paste. Four batches of specimens were made for the tests. Cement (C) in the cement matrix was replaced with 5% of ground waste glass (5S), 15 % of metakaolin and mixed pozzolanic was addition (MIX 20) made of 5% of ground waste glass and 15 % of metakaolin. The best improvement of mechanical properties after 90 days of curing was observed in the specimens modified with the mixed pozzolanic addition. X-ray, TGA tests and microstructure analysis revealed that the improvement of mechanical properties is caused by the higher content of hydration products and a strong contact zone between glass particles and foam glass splinters present in metakaolin waste addition. The formation of C-S-H hydrates on the surface of glass foam splinters and in the pores was also observed. This kind of microstructure formation has a positive effect on cement matrix microstructure and physical-mechanical properties of hardened cement paste.


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doi: 10.13168/cs.2022.0016
 
 
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