Resistance of fly ash-Portland cement blends to thermal shock
Abstract
Thermal-shock resistance of high-content fly ash-Portland cement blends was tested in the following ways. Activated and non-activated blends with 80-90 % fly ash F (FAF) were left to set at room temperature, then hydrated for 24 hours at 85°C and 24-more hours at 300°C and tested in five thermal-shock cycles (600°C heat - 25°C water quenching). XRD, and thermal gravimetric analyses, along with calorimetric measurements and SEM-EDX tests demonstrated that the activated blends form more hydrates after 24 hours at 300°C, and achieve a higher short-term compressive strength than do non-activated ones. Sodium meta-silicate and sodaash engendered the concomitant hydration of OPC and FAF, with the formation of mixed crystalline FAF-OPC hydrates and FAF hydrates, such as garranite, analcime, and wairakite, along with the amorphous FAF hydration products. In SS-activated and non-activated blends separate OPC (tobermorite) and FAF (amorphous gel) hydrates with no mixed crystalline products formed. The compressive strength of all tested blends decreased by nearly 50% after 5 thermal-shock test cycles. These changes in the compressive strength were accompanied by a marked decrease in the intensities of XRD patterns of the crystalline hydrates after the thermalshock. As a result, there was no significant difference in the performance ofmore »
- Authors:
-
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- OSTI Identifier:
- 1232687
- Report Number(s):
- BNL-108355-2015-JA
Journal ID: ISSN 0951-7197; R&D Project: 20630
- Grant/Contract Number:
- SC00112704
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Advances in Cement Research
- Additional Journal Information:
- Journal Volume: 22; Journal Issue: 12; Journal ID: ISSN 0951-7197
- Publisher:
- ICE Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 15 GEOTHERMAL ENERGY
Citation Formats
Pyatina, Tatiana, and Sugama, Toshifumi. Resistance of fly ash-Portland cement blends to thermal shock. United States: N. p., 2015.
Web. doi:10.1680/adcr.15.00030.
Pyatina, Tatiana, & Sugama, Toshifumi. Resistance of fly ash-Portland cement blends to thermal shock. United States. https://doi.org/10.1680/adcr.15.00030
Pyatina, Tatiana, and Sugama, Toshifumi. 2015.
"Resistance of fly ash-Portland cement blends to thermal shock". United States. https://doi.org/10.1680/adcr.15.00030. https://www.osti.gov/servlets/purl/1232687.
@article{osti_1232687,
title = {Resistance of fly ash-Portland cement blends to thermal shock},
author = {Pyatina, Tatiana and Sugama, Toshifumi},
abstractNote = {Thermal-shock resistance of high-content fly ash-Portland cement blends was tested in the following ways. Activated and non-activated blends with 80-90 % fly ash F (FAF) were left to set at room temperature, then hydrated for 24 hours at 85°C and 24-more hours at 300°C and tested in five thermal-shock cycles (600°C heat - 25°C water quenching). XRD, and thermal gravimetric analyses, along with calorimetric measurements and SEM-EDX tests demonstrated that the activated blends form more hydrates after 24 hours at 300°C, and achieve a higher short-term compressive strength than do non-activated ones. Sodium meta-silicate and sodaash engendered the concomitant hydration of OPC and FAF, with the formation of mixed crystalline FAF-OPC hydrates and FAF hydrates, such as garranite, analcime, and wairakite, along with the amorphous FAF hydration products. In SS-activated and non-activated blends separate OPC (tobermorite) and FAF (amorphous gel) hydrates with no mixed crystalline products formed. The compressive strength of all tested blends decreased by nearly 50% after 5 thermal-shock test cycles. These changes in the compressive strength were accompanied by a marked decrease in the intensities of XRD patterns of the crystalline hydrates after the thermalshock. As a result, there was no significant difference in the performance of the blends with different activators},
doi = {10.1680/adcr.15.00030},
url = {https://www.osti.gov/biblio/1232687},
journal = {Advances in Cement Research},
issn = {0951-7197},
number = 12,
volume = 22,
place = {United States},
year = {Fri Sep 11 00:00:00 EDT 2015},
month = {Fri Sep 11 00:00:00 EDT 2015}
}
Web of Science
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Works referencing / citing this record:
Role of Tartaric Acid in Chemical, Mechanical and Self-Healing Behaviors of a Calcium-Aluminate Cement Blend with Fly Ash F under Steam and Alkali Carbonate Environments at 270 °C
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