Early age strength increase of fly ash blended cement by a ternary hardening accelerating admixture
- Department of Structural Engineering, Norwegian University of Science and Technology (Norway)
- Department of Materials Science and Engineering, Norwegian University of Science and Technology (Norway)
The applicability of a combination of sodium thiocyanate (NaSCN), diethanolamine (DEA) and glycerol (Gly) with small dosages as a ternary hardening accelerating admixture for fly ash blended cement (OPC-FA) was studied. The ternary admixture induced higher early and later age mortar strength at both low (5 °C) and normal (20 °C) temperature. Despite used in lower dosage the ternary admixture led to higher strength of the investigated OPC-FA system than other chemicals (e.g. sodium sulfate). Results obtained from isothermal calorimetry, thermogravimetric analysis (TGA) and X-ray diffraction (XRD) showed that the ternary admixture accelerated the cement hydration and increased the amount of AFm (notably calcium hemicarboaluminate hydrate) in the hydration products. A synergistic effect between the three components of the accelerator on the hydration of OPC-FA system was observed.
- OSTI ID:
- 22696549
- Journal Information:
- Cement and Concrete Research, Journal Name: Cement and Concrete Research Vol. 81; ISSN 0008-8846; ISSN CCNRAI
- Country of Publication:
- United States
- Language:
- English
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