| Issue |
E3S Web Conf.
Volume 280, 2021
Second International Conference on Sustainable Futures: Environmental, Technological, Social and Economic Matters (ICSF 2021)
|
|
|---|---|---|
| Article Number | 07001 | |
| Number of page(s) | 7 | |
| Section | Sustainable Materials and Technologies | |
| DOI | https://doi.org/10.1051/e3sconf/202128007001 | |
| Published online | 30 June 2021 | |
Study of influence of alkaline component type on pH value and properties of alkali activated concretes containing basalt rock
Kyiv National University of Construction and Architecture, Scientific Research Institute for Binders and Materials, 31 Povitroflotskyi Ave., Kyiv, 03037, Ukraine
* Corresponding author: kovalchuk.oyu@gmail.com
The paper discusses the questions of alkalinity changes in alkali activated cement-based materials at different stages of hardening. It was shown that use of alkali activated cement with dry alkaline component (“all-in-one system”) in the presence of basalt rock leads to the immediate decrease of pH value and strength drop of the material. On the other hand, using alkaline component in the form of alkaline solution provides almost normal hardening of systems. Taking into account obtained results a methodology of changes in concrete mix design was proposed. In general, for different cement systems under study pH value varies from 8.5 to 12 reflecting on the materials structure formation processes and strength gain. Shrinkage of the systems was within the ranges 0.3…0.6 mm/m at 28 days age and 0.3…0.5 mm/m for different systems. Absence of expansion witnesses about compensation of ASR results and normal structure developments processes in the material comparing to OPC.
© The Authors, published by EDP Sciences, 2021
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