A comparative study on the influence of metakaolin and kaolin additives on properties and structure of the alkali­activated slag cement and concrete

Authors

DOI:

https://doi.org/10.15587/1729-4061.2018.119624

Keywords:

alkali activated cement, compressive strength, concrete, kaolin, metakaolin, freeze/thaw resistance

Abstract

The influence of the metakaolin and kaolin additives on the formation and properties of the alkali-activated slag cements and concretes was studied.

The influence of the metakaolin and kaolin additives on macro- and microstructure formation of the cements and concretes was studied.

A conclusion was drawn that the processes of microstructure formation of the cement stone with the additive flow in a similar sequence but with different intensity. A conclusion was drawn that the addition of the kaolin instead of metakaolin affected as follows: 2.5–10 % by mass reduced the value of NCP by 9.5–8.7 %, respectively; 2.5–5 % by mass did not affect setting times, but with increase up to 10 % by mass the initial setting time was shorter (from 48 min to 40 min); 2.5–5 % by mass did not affect compressive strength at all stages of hardening, but with increase up to 10 % by mass reduced strength characteristics of the cement-sand specimens (from 57.0 MPa to 49.0 MPa).

In case of the addition of 5 % kaolin by mass, an optimal macrostructure of the concrete is formed in which the quantities of the ''conditionally'' closed pores are by 17.7 % higher compared to those of the concretes with the same quantities of the metakaolin. This resulted in the higher freeze/thaw resistance of the concrete (from F400 up to F500). Based on the comparison of properties and structure of the cement and concrete containing the kaolin and metakaolin additives, a possibility to substitute metakaolin by kaolin as a correcting additive was established.

Author Biographies

Pavel Krivenko, Kyiv National University of Construction and Architecture Povitroflotskiy ave., 31, Kyiv, Ukraine, 03037

Doctor of Technical Sciences, Professor

Scientific Research Institute for Binders and Materials

Oleg Petropavlovskyi, Kyiv National University of Construction and Architecture Povitroflotskiy ave., 31, Kyiv, Ukraine, 03037

PhD, Senior researcher

Scientific Research Institute for Binders and Materials

Oleksandr Kovalchuk, Kyiv National University of Construction and Architecture Povitroflotskiy ave., 31, Kyiv, Ukraine, 03037

PhD, Senior researcher

Scientific Research Institute for Binders and Materials

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Published

2018-02-22

How to Cite

Krivenko, P., Petropavlovskyi, O., & Kovalchuk, O. (2018). A comparative study on the influence of metakaolin and kaolin additives on properties and structure of the alkali­activated slag cement and concrete. Eastern-European Journal of Enterprise Technologies, 1(6 (91), 33–39. https://doi.org/10.15587/1729-4061.2018.119624

Issue

Vol. 1 No. 6 (91) (2018): Technology organic and inorganic substances

Section

Technology organic and inorganic substances

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Copyright (c) 2018 Pavel Krivenko, Oleg Petropavlovskyi, Oleksandr Kovalchuk

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