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Effect of disodium EDTA on hydration and mechanical properties of calcium sulphoaluminate-belite cement.
- Source :
-
Cement & Concrete Research . Feb2023, Vol. 164, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- Effects of disodium EDTA (EDTA-2Na) on hydration and mechanical properties of calcium sulphoaluminate-belite cement (CSBC) were investigated systematically. Results show that EDTA-2Na addition leads to visible changes in CSBC strength development. 0.50 % EDTA-2Na significantly enhances the compressive strength by 18 % and 23 % compared with the blank specimens at 7 d and 28 d, while reducing the strength at 8 h and 1 d. The content of the main hydration product (AFt) determines the strength development. At the early hydration stage, EDTA-2Na delays hydration of ye'elimite to form AFt, thus decreasing the early hydration degree of CSBC and increasing the porosity to reduce strength. In the presence of EDTA-2Na, the morphology changes of amorphous aluminum hydroxide (AH 3) facilitate the AH 3 -C 2 S-CaSO 4 reaction to increase AFt content and form a more condensed structure, thus enhancing the late strength. In this way, the strength development of CSBC mortars can be modified and regulated by EDTA-2Na. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00088846
- Volume :
- 164
- Database :
- Academic Search Index
- Journal :
- Cement & Concrete Research
- Publication Type :
- Academic Journal
- Accession number :
- 160962988
- Full Text :
- https://doi.org/10.1016/j.cemconres.2022.107041